Viscosity: A, Test Method: Test viscometer viscosity measured PI-oriented film.
B, Criteria: The test results viscosity values consistent with our suppliers to provide parameters.
Additive drying performance (pre-baking performance) A, Test Method: thickness requirements by the production process, the PI-oriented film coated on ITO conductive glass, provided by the supplier of heating and baking temperature and time parameters.
B, criteria: temperature and time in the parameter under, PI-oriented film additives completely dry.
Curing properties: A, test method: the PI oriented film has completely dried additive ITO conductive glass according to the production process requirements and vendor-supplied parameters required separately for curing.
B, criteria: cure fully.lcm module After filling liquid crystal into the box can be displayed properly.
Wear: A, test method: the PI-oriented film has completely dried additive ITO conductive glass production process parameters by directional friction five times.
B, criteria: a box after filling liquid crystal display properly.
Optical performance and reliability: A, test method: the test PI oriented film made into the glass and is now producing the PI oriented film made into glass by current production process parameters, choose a model made into a finished product and test its optical and reliable sexual performance
B, criteria: optical performance and reliability test results with the current production of PI-oriented film made of glass results considerably, and in the test product model within the required range.
PI-oriented film selection rules:
LCD display type selection is generally based on the corresponding pretilt PI: TN-LCD choose low pretilt angle PI, COG LCD Display selection of high pretilt angle PI.
PI guide layer for some special treatment process under the additional layers of the LCD, select the PI reference when additional layer characteristics to consider. BLACK MASK COLOR-STN and products to choose CF curing temperature is less than the decomposition temperature of the PI; using a flexible conductive film forming of the LCD, the curing temperature should be less than the softening point temperature flexible substrate PI.
color lcd display module
color lcd display module
2013年7月26日星期五
PI oriented film properties
PI-oriented film is composed of:
The heat curable polymer PI, PI alignment film component of the stock solution is a polyimide and DMA, NMP solvent and BC.
The UV-curable polymer PI, PI alignment film component of the stock solution with UV-active group is a polyimide and a solvent,128x64 oled such as PI liquid crystal orientation direction is the direction of radiation, so there soon productivity and convenience of operation , but because it is often insufficient polymerization, the current use of products make it into a single point defects in the display when a higher rate applies only to convert some of the light curtain's productions, rarely used on the LCD display, the following are no longer Description.
PI-oriented characteristics of the film:
Directing film with a PI LCD solids content in the stock solution is a small molecule compound, which is generated at a high temperature polymerization reaction to form with many branched long chain macromolecular solid polymer polyamides. Polymer molecules are branched chain and the main chain of the angle is called a pretilt angle guide layer. These polymers are branched chain group and the liquid crystal molecules between the relatively strong force, the liquid crystal molecules have the role of anchor,lcd module the pretilt angle of the liquid crystal can press direction.
PI not complete the polymerization liquid or a polyimide is a small molecule binding with the water molecules was sol, it will inhibit the polymerization of polyimide, not complete the main chain, branched-chain and have lost the original arrangement direction, lack of the required pre-tilt LCD production. So PI dope to moisture, humidity operating environment should be strictly controlled.
Some special STN and TFT PI, the cured in branched form on the basis of sub-branched, branched and branched times even the angle between the liquid crystal molecules coincide end structure or similar, so the liquid crystal have a more a strong anchoring effect. Thanks to the second branched-chain, such as if the liquid crystal molecules to increase the contact area between the guide layer, to a certain extent compensates for some of the guide layer processing defects. The PI in a large area display allows display more evenly. While avoiding rubbing treatment process in order to obtain high strength friction lower density higher friction, damage is relatively fragile and TFT generator CF layer.
Have been cured of the PI-oriented film can easily absorb moisture, and will break down in the water. And after rubbing treatment, the PI layer is likewise more fragile, prolonged exposure to the air, with the air in the water and carbon dioxide, thereby disrupting the original state of a branched arrangement, so that the pretilt angle is uneven, and even produce pretilt collapse phenomenon.
PI classification:
PI size at the pretilt angle is divided into:
1 to 3 degrees of low pretilt angle of the TN type PI and 4 to a high pretilt angle of 9 ° STN type PI.
PI affect the main parameters of the performance-oriented film
Solid content; viscosity; Na ion content; thermal decomposition temperature; permittivity; volume resistivity; transmission; absorption; refractive index; pretilt angle
The heat curable polymer PI, PI alignment film component of the stock solution is a polyimide and DMA, NMP solvent and BC.
The UV-curable polymer PI, PI alignment film component of the stock solution with UV-active group is a polyimide and a solvent,128x64 oled such as PI liquid crystal orientation direction is the direction of radiation, so there soon productivity and convenience of operation , but because it is often insufficient polymerization, the current use of products make it into a single point defects in the display when a higher rate applies only to convert some of the light curtain's productions, rarely used on the LCD display, the following are no longer Description.
PI-oriented characteristics of the film:
Directing film with a PI LCD solids content in the stock solution is a small molecule compound, which is generated at a high temperature polymerization reaction to form with many branched long chain macromolecular solid polymer polyamides. Polymer molecules are branched chain and the main chain of the angle is called a pretilt angle guide layer. These polymers are branched chain group and the liquid crystal molecules between the relatively strong force, the liquid crystal molecules have the role of anchor,lcd module the pretilt angle of the liquid crystal can press direction.
PI not complete the polymerization liquid or a polyimide is a small molecule binding with the water molecules was sol, it will inhibit the polymerization of polyimide, not complete the main chain, branched-chain and have lost the original arrangement direction, lack of the required pre-tilt LCD production. So PI dope to moisture, humidity operating environment should be strictly controlled.
Some special STN and TFT PI, the cured in branched form on the basis of sub-branched, branched and branched times even the angle between the liquid crystal molecules coincide end structure or similar, so the liquid crystal have a more a strong anchoring effect. Thanks to the second branched-chain, such as if the liquid crystal molecules to increase the contact area between the guide layer, to a certain extent compensates for some of the guide layer processing defects. The PI in a large area display allows display more evenly. While avoiding rubbing treatment process in order to obtain high strength friction lower density higher friction, damage is relatively fragile and TFT generator CF layer.
Have been cured of the PI-oriented film can easily absorb moisture, and will break down in the water. And after rubbing treatment, the PI layer is likewise more fragile, prolonged exposure to the air, with the air in the water and carbon dioxide, thereby disrupting the original state of a branched arrangement, so that the pretilt angle is uneven, and even produce pretilt collapse phenomenon.
PI classification:
PI size at the pretilt angle is divided into:
1 to 3 degrees of low pretilt angle of the TN type PI and 4 to a high pretilt angle of 9 ° STN type PI.
PI affect the main parameters of the performance-oriented film
Solid content; viscosity; Na ion content; thermal decomposition temperature; permittivity; volume resistivity; transmission; absorption; refractive index; pretilt angle
PI-oriented film entry knowledge
As the liquid crystal molecules anchored the main material, application-oriented films from pure ionic interactions to intermolecular forces in a major development, application-oriented film, not only ionic bonding force, but the main thing is to have molecular key force, coupled with the continuous development of surface treatment technology,Character LCD
Module continuous improvement of processing machines, in addition to increase production, and improve the viewing angle requirements, guide further research trial in the membrane material, the orientation film material has almost finalized.
It is surprising that, as a general guide TN-LCD using membrane materials, production processing, but in some LCD production plant harder than STN-LCD. In fact, STN-LCD products, low contrast, viewing angle is wide, but obscures some of the electrical properties of oriented films of defects. Unless there is a very serious collapse pretilt angle, oriented film defects in the STN-LCD display products, the total does not cause customers special attention. But in TN-LCD production on membrane performance oriented migration is often a direct reaction to the product's effect on the 128x32 oled.
Anchoring the liquid crystal material molecules, the pretilt angle of the alignment film in the TN-LCD and STN-LCD product is almost the same role. However, TN-LCD and STN-LCD compared, because the movement of the liquid crystal molecules in a different way, and thus the two types of product-oriented film soon diverged, STN-LCD-oriented film material used in the production, the use of more stringent environmental and purity of raw materials. In addition there are a number of manufacturers in the branched-chain molecules are used on other long-chain and secondary chain technology, so that more stable branched molecules, the pretilt angle is more consistent, but this structure due to the secondary branched intermolecular forces between the mutually exclusive , so that there is a certain branched structure similar to their own repair function, so that the performance of the machine-oriented processing deficiencies have some compensation, because in theory, mechanical precision insatiable pretilt alignment film processing accuracy requirements. This approach produced a guide film used in a low drive large ones, small area, wide line spacing on the product, its unique properties may not be reflected in production but high drive large ones, a large area and micro-line distance products, improve product yields, improve product stability and repeatability of production, and its excellent performance is the other without using this technology to produce oriented films can not be compared.
TN-LCD products with the guide film, due to the width of the viewing angle, it is impossible using the above-described structure, but due to the production cost reasons, is not necessary. And because the process improvements, machinery and equipment to improve the performance of the previous cost-oriented film material that was once affected by the process is unstable because, by the exclusion of everyone, but now because it can be in different processes under different effects, but more by a number of TN-LCD manufacturer of all ages, especially in some process adjustments automatic production line easily.
It is surprising that, as a general guide TN-LCD using membrane materials, production processing, but in some LCD production plant harder than STN-LCD. In fact, STN-LCD products, low contrast, viewing angle is wide, but obscures some of the electrical properties of oriented films of defects. Unless there is a very serious collapse pretilt angle, oriented film defects in the STN-LCD display products, the total does not cause customers special attention. But in TN-LCD production on membrane performance oriented migration is often a direct reaction to the product's effect on the 128x32 oled.
Anchoring the liquid crystal material molecules, the pretilt angle of the alignment film in the TN-LCD and STN-LCD product is almost the same role. However, TN-LCD and STN-LCD compared, because the movement of the liquid crystal molecules in a different way, and thus the two types of product-oriented film soon diverged, STN-LCD-oriented film material used in the production, the use of more stringent environmental and purity of raw materials. In addition there are a number of manufacturers in the branched-chain molecules are used on other long-chain and secondary chain technology, so that more stable branched molecules, the pretilt angle is more consistent, but this structure due to the secondary branched intermolecular forces between the mutually exclusive , so that there is a certain branched structure similar to their own repair function, so that the performance of the machine-oriented processing deficiencies have some compensation, because in theory, mechanical precision insatiable pretilt alignment film processing accuracy requirements. This approach produced a guide film used in a low drive large ones, small area, wide line spacing on the product, its unique properties may not be reflected in production but high drive large ones, a large area and micro-line distance products, improve product yields, improve product stability and repeatability of production, and its excellent performance is the other without using this technology to produce oriented films can not be compared.
TN-LCD products with the guide film, due to the width of the viewing angle, it is impossible using the above-described structure, but due to the production cost reasons, is not necessary. And because the process improvements, machinery and equipment to improve the performance of the previous cost-oriented film material that was once affected by the process is unstable because, by the exclusion of everyone, but now because it can be in different processes under different effects, but more by a number of TN-LCD manufacturer of all ages, especially in some process adjustments automatic production line easily.
Liquid crystal sealing material the use of plastic box
Frozen plastic box the best site with the same operating temperature environment thawed 4 hours, and then opened the cover to access, access to a surplus after such containers to immediately stamped seal plastic box, plastic box in order to avoid The solvent absorption of moisture and contamination by other solvents.
With plastic when sufficiently stirred,Character LCD Module stirring time is longer, the viscosity of the smaller screen is better. But overly vigorous stirring can easily lead to the frame adhesive solvent evaporation increases.
After stirring the boxes to vacuum bubble gum, usually standing not eliminate air bubbles mixed Tibet, in a subsequent printing of the phenomenon is more likely to break.
Glue in the screen printing frame, the viscosity will decrease over time, so the frequency of use of recycled plastic or old plastic mixing ratio should be timely adjusted to maintain the required printing line width fluctuation range.
Good plastic box plastic box printing products should be pre-drying solvent inside the catalyst, and to ensure a stable plastic box so the initial height. And try to ensure complete evaporation of the solvent, so as to avoid pairing combination box again after evaporation in a sealed box affect the performance oriented film.
Plastic box plastic box curing should have cured promptly removed when the temperature applied pressure, first make plastic box full line after curing, relatively dense plastic box;OLED Display Module two adhesive curing temperature in the box, the plastic space near the softening temperature of the powder has been in external force causing more unrecoverable deformation, making the cell thickness parameters deviate from the design parameters. But for some bad space powder dispersion value can increase fitness Lou box glue curing temperatures and longer pressing time can be a slight improvement in the box of powder particle dispersion value; such cases need special attention is powder box number and a rebound stress after the bubble problem caused by the liquid crystal temperature.
Plastic box storage and handling methods:
Plastic storage box when confined, moisture, shading, at-200C ~-150C temperature storage of six months.
According to regulations when handling chemicals regulation
With plastic when sufficiently stirred,Character LCD Module stirring time is longer, the viscosity of the smaller screen is better. But overly vigorous stirring can easily lead to the frame adhesive solvent evaporation increases.
After stirring the boxes to vacuum bubble gum, usually standing not eliminate air bubbles mixed Tibet, in a subsequent printing of the phenomenon is more likely to break.
Glue in the screen printing frame, the viscosity will decrease over time, so the frequency of use of recycled plastic or old plastic mixing ratio should be timely adjusted to maintain the required printing line width fluctuation range.
Good plastic box plastic box printing products should be pre-drying solvent inside the catalyst, and to ensure a stable plastic box so the initial height. And try to ensure complete evaporation of the solvent, so as to avoid pairing combination box again after evaporation in a sealed box affect the performance oriented film.
Plastic box plastic box curing should have cured promptly removed when the temperature applied pressure, first make plastic box full line after curing, relatively dense plastic box;OLED Display Module two adhesive curing temperature in the box, the plastic space near the softening temperature of the powder has been in external force causing more unrecoverable deformation, making the cell thickness parameters deviate from the design parameters. But for some bad space powder dispersion value can increase fitness Lou box glue curing temperatures and longer pressing time can be a slight improvement in the box of powder particle dispersion value; such cases need special attention is powder box number and a rebound stress after the bubble problem caused by the liquid crystal temperature.
Plastic box storage and handling methods:
Plastic storage box when confined, moisture, shading, at-200C ~-150C temperature storage of six months.
According to regulations when handling chemicals regulation
Affect the performance of the main parameters plastic box
Maximum particle size; viscosity; curing temperature; regular price ion content; molecular size;20x4 lcd permittivity
Plastic box factory adaptive testing methods and criteria:
Viscosity: A, Test Method: Test test box gluing degree.
B, criteria: viscosity within the parameters provided by suppliers and the final viscosity is similar to the production of frames.
Screen Performance: A, Test Method: Silkscreen at current production process conditions tested plastic box, observe the printing results.
B, criteria: full uniform lines, screen width is less than or equal to the current production of plastic box.
Curing performance and reliability: A, test method: the production process according to the present conditions of the sealant cure.
B, criteria: cure completely cured product was boiled four hours frameless plastic cracking and leakage phenomenon; warp-400C freezer four hours after the frameless plastic cracking and leakage phenomenon.
Reactive with the liquid crystal: A,mini lcd module test method: plastic box to be tested according to the production process conditions for the test sample, test its optical properties.
B, Criterion: plastic box near the viewing area without extending in a direction toward the domain. Does not affect the optical parameters on the LCD, optical properties after high temperature and humidity changes reliability requirements in the product range.
Plastic box factory adaptive testing methods and criteria:
Viscosity: A, Test Method: Test test box gluing degree.
B, criteria: viscosity within the parameters provided by suppliers and the final viscosity is similar to the production of frames.
Screen Performance: A, Test Method: Silkscreen at current production process conditions tested plastic box, observe the printing results.
B, criteria: full uniform lines, screen width is less than or equal to the current production of plastic box.
Curing performance and reliability: A, test method: the production process according to the present conditions of the sealant cure.
B, criteria: cure completely cured product was boiled four hours frameless plastic cracking and leakage phenomenon; warp-400C freezer four hours after the frameless plastic cracking and leakage phenomenon.
Reactive with the liquid crystal: A,mini lcd module test method: plastic box to be tested according to the production process conditions for the test sample, test its optical properties.
B, Criterion: plastic box near the viewing area without extending in a direction toward the domain. Does not affect the optical parameters on the LCD, optical properties after high temperature and humidity changes reliability requirements in the product range.
Liquid crystal sealing material plastic box introductory knowledge
Currently used on the lcd module frame plastic sealing material that there are two main categories, one box is UV curable adhesive, mainly used in the production of pieces of sheet curing methods on; other is thermally cured sealant, most Semi-automatic production line is mainly use this plastic box. The following description is represented by XN-5A thermosetting plastic box.
XN-5A used in the liquid crystal display industry has thirty years of history, and almost monopolized the LCD monitor sealing material nearly twenty years later with the development of large-size TFT, was the constant application of new materials to break . Even now, XN-5A the lcm module industry is still the most important sealing material.
XN-5A sample is tested thousands of times before they succeed in an electronic packaging materials, its unique three-component liquid mixed party and the resulting formation of three segments curing methods, packaging materials completely avoid contamination of the final product , is the last century's most successful electronic packaging materials.
XN-5A epoxy resin, catalyst and solvent mixture from the catalyst. Room temperature, the plastic box in the epoxy resin in liquid form, the catalyst is dissolved in a liquid solvent inside the uncured plastic boxes have a certain viscosity, but with continued stirring viscosity fall within a range. Inside the catalyst solvent evaporation starts at 80 degrees, but to evaporate completely, they should at 105 degrees, the temperature of the catalyst can be avoided during solvent evaporation absorb moisture; losing solvent crystallization catalyst will become crystal. Then it can be combined support from the upper and lower liquid crystal substrate can be reduced when heated plastic box behind the space inside the powder kept under pressure and do not deserve to make room for a long time after the softening powder in the heating kept under pressure to produce permanent deformation, thus changing the setting parameters of the liquid crystal cell gap. Melted at about 1180C liquid catalyst, as the temperature rises, the molecular dispersion of the epoxy group which, when heated to about 1420C, the epoxy resin in the catalyst, the high polymerization reaction to form glassy solid, the upper and lower substrates bonded together.
XN-5A used in the liquid crystal display industry has thirty years of history, and almost monopolized the LCD monitor sealing material nearly twenty years later with the development of large-size TFT, was the constant application of new materials to break . Even now, XN-5A the lcm module industry is still the most important sealing material.
XN-5A sample is tested thousands of times before they succeed in an electronic packaging materials, its unique three-component liquid mixed party and the resulting formation of three segments curing methods, packaging materials completely avoid contamination of the final product , is the last century's most successful electronic packaging materials.
XN-5A epoxy resin, catalyst and solvent mixture from the catalyst. Room temperature, the plastic box in the epoxy resin in liquid form, the catalyst is dissolved in a liquid solvent inside the uncured plastic boxes have a certain viscosity, but with continued stirring viscosity fall within a range. Inside the catalyst solvent evaporation starts at 80 degrees, but to evaporate completely, they should at 105 degrees, the temperature of the catalyst can be avoided during solvent evaporation absorb moisture; losing solvent crystallization catalyst will become crystal. Then it can be combined support from the upper and lower liquid crystal substrate can be reduced when heated plastic box behind the space inside the powder kept under pressure and do not deserve to make room for a long time after the softening powder in the heating kept under pressure to produce permanent deformation, thus changing the setting parameters of the liquid crystal cell gap. Melted at about 1180C liquid catalyst, as the temperature rises, the molecular dispersion of the epoxy group which, when heated to about 1420C, the epoxy resin in the catalyst, the high polymerization reaction to form glassy solid, the upper and lower substrates bonded together.
2013年7月25日星期四
And white light LED technology
Paradoxical LED emits monochromatic light, the color light illumination apparatus with, as compared with most conventional light sources, because of its high power efficiency, that a better color light. However, with the LED light source instead of the traditional, you must determine the white LED should achieve the necessary level of efficiency and quality. Due to radiation blue - green spectral components of GaN LED unprecedented progress, white lamps have great prospects. There are two ways to achieve white light serial
oled:
One is to separate the radiation of red, green, and blue light LED hybrid (known as RGB); another band fluorescent radiation is radiation GaN blue combination, it can become part of the blue light-wave radiation, and with The remaining blue light and emits white light combination. Whether the first or second method may be obtained with two colors of white light component; has three color components of the color quality can be obtained (Ra 80-90), for a process using the phosphor techniques using two different components, as well as the middle of the program.
Theoretically RGB method is more effective, but requires auxiliary optical devices, resulting in reduced efficiency and increased system costs. The problem with phosphor simple, it is the efficiency of the phosphor, which may become a RGB series. However, these two processes is the main difference between the technologies, RGB method can "mix color", then the phosphor is stability. With different phosphors, RGB France in the lighting field has opened up new possibilities. From the white LED light efficiency growth prospects of view, LED using the phosphor at near 2005 Good results can be achieved, luminous efficiency of 50lm / w, we can predict that the white mini lcd module lamp is used for today and halogen in place.
One is to separate the radiation of red, green, and blue light LED hybrid (known as RGB); another band fluorescent radiation is radiation GaN blue combination, it can become part of the blue light-wave radiation, and with The remaining blue light and emits white light combination. Whether the first or second method may be obtained with two colors of white light component; has three color components of the color quality can be obtained (Ra 80-90), for a process using the phosphor techniques using two different components, as well as the middle of the program.
Theoretically RGB method is more effective, but requires auxiliary optical devices, resulting in reduced efficiency and increased system costs. The problem with phosphor simple, it is the efficiency of the phosphor, which may become a RGB series. However, these two processes is the main difference between the technologies, RGB method can "mix color", then the phosphor is stability. With different phosphors, RGB France in the lighting field has opened up new possibilities. From the white LED light efficiency growth prospects of view, LED using the phosphor at near 2005 Good results can be achieved, luminous efficiency of 50lm / w, we can predict that the white mini lcd module lamp is used for today and halogen in place.
General specification for LED electronic display
This standard specifies the TFT Lcd
Modules screen definition, classification, technical requirements, test methods, inspection rules, packaging, transportation and storage requirements flag. This standard applies to LED display products. It is the LED display product design, manufacture, installation, use, quality inspection and develop technical standards, technical documents major technical basis.
Classification
LED display can be classified according to the following conditions:
Use of the environment:
LED display by use of the environment is divided into indoor and outdoor LED display LED display.
Display color:
LED display by the display color is divided into single-color LED display (including pseudo-color LED display), dual color LED display and full-color (three-color) LED display. Press the gray level can be divided into 16,32,64,128,256 gray color lcd display module.
Display Performance:
LED display LED screen display performance into text, graphic LED display, LED display computer video, TV video LED display and LED display market and so on. LED display market generally includes securities, interest rates, futures and other uses of the LED display.
Basic luminous point:
Non-market type LED display, indoor LED display by using LED single spot diameter can be divided into Φ3mm, Φ375mm, Φ5mm, Φ8mm, and Φ10mm other display; outdoor LED display can be divided using the pixel diameter Φ19mm , Φ22mm and Φmm26 other LED display. Quotes class LED display size by using digital control can be divided into 2.0cm (0.8inch), 2.5cm (1.0inch), 3.0cm (1.2inch), 4.6cmm (1.8inch), 5.8cm (2.3inch), 7.6 cm (3inch) and other LED display.
Classification
LED display can be classified according to the following conditions:
Use of the environment:
LED display by use of the environment is divided into indoor and outdoor LED display LED display.
Display color:
LED display by the display color is divided into single-color LED display (including pseudo-color LED display), dual color LED display and full-color (three-color) LED display. Press the gray level can be divided into 16,32,64,128,256 gray color lcd display module.
Display Performance:
LED display LED screen display performance into text, graphic LED display, LED display computer video, TV video LED display and LED display market and so on. LED display market generally includes securities, interest rates, futures and other uses of the LED display.
Basic luminous point:
Non-market type LED display, indoor LED display by using LED single spot diameter can be divided into Φ3mm, Φ375mm, Φ5mm, Φ8mm, and Φ10mm other display; outdoor LED display can be divided using the pixel diameter Φ19mm , Φ22mm and Φmm26 other LED display. Quotes class LED display size by using digital control can be divided into 2.0cm (0.8inch), 2.5cm (1.0inch), 3.0cm (1.2inch), 4.6cmm (1.8inch), 5.8cm (2.3inch), 7.6 cm (3inch) and other LED display.
LED display hardware uses the environment
LED display hardware, including OLED Display
Module display according to type, size, and other conditions determined by use of the site part of a general purpose computer, communication lines,Character LCD
Display dedicated data conversion section and a display section. In detail specification shall specify:
a. on the host computer, a variety of optional cards, external devices and communication interface requirements;
b. the communication line requirements and indicate the maximum communication distance;
c. data conversion part of communication with the host computer;
d. supply requirements and structural installation requirements.
a. on the host computer, a variety of optional cards, external devices and communication interface requirements;
b. the communication line requirements and indicate the maximum communication distance;
c. data conversion part of communication with the host computer;
d. supply requirements and structural installation requirements.
2013年7月21日星期日
Voltage and the voltage of the five tone effect
VGH: Vgatehigh, is a high-level gate potential, which is a voltage level to open gate; Graphic LCD Display
VGL: Vgatelow, gate level is low, that is, close gate voltage level, the voltage at the second driving force driving the third order, this voltage is used to generate Vgoffl;
VgoffL: Vgateofflow, is the gate voltage of the low-level closed (use the driver in the third-order by VGL get through a voltage conversion circuit);
VgoffH: Vgateoffhigh, a gate turn-off voltage of the high level (in the third-order driver used to eliminate the next stage gate closed by the storage capacitor (CS ON GATE) causing the voltage value is changed), the value of its basic can be considered as Vgoffl + Vcom; 144x32 lcd
As VCOML and VCOMH, I would like to not have to explain, we all should know it.
These are some personal opinion, I do not know is not right, do not wish to mislead you go.
We can know that some IC data above refers only to VGH and VGL, it is because, Fengyun IC supports only second driver, some IC data at VGH, VGL, VGOFFH, VGOFFL, have, it is because this IC supports second and third driving.
VDDD is a digital circuit voltage; VDDG, VEEG second order-driven GATE switch level; VCOM Needless to say, the liquid crystal deflection reference voltage; VDDA on the PCB will be separated by divider circuit voltage of 10 to 14 group, As the output of the DAC IC VGMA internal reference voltage divider circuit through the PCB, produce a plurality of reference voltages, can reduce the voltage divider circuit inside the IC, and money.
2013年7月11日星期四
Backlight diffusion network design
Backlight unit is a notebook of the most power-hungry device, thereby increasing the backlight unit of the light use efficiency has become an important issue. Although the end edge of the incident light rays approach has excellent convergence characteristics, but basically the backlight unit is transparent element, that is a white fine structure (hereinafter referred to as dot pattern or a light scattering body) and the interference pattern produced by the liquid crystal cell With more and more obvious large-scale LCD monitor has almost reached the degree can not be ignored. Although tiny structures obtained through optimal design suitable shape, but how effectively the whole arrangement of tiny structure is the most difficult problem the designer, so then to introduce the theory of irregular dot pattern design (less known outlets generation method).
The current status of network generation methodOLED modules
Avoid liquid crystal cell of the data line, gate line two regularity pattern interferes with the light guide plate of the network, in theory, the most effective way is to make the dot pattern for irregular arrangement, but in fact, if the cause irregular arrangement of overlapping networks, the The site will become bright spots or dark spots, in addition to the filling rate of distribution outlets pattern if there is non-uniformity occurs when uneven brightness on the visual phenomenon, in other words the ideal dot pattern must have the following three conditions:
① dot pattern was highly irregular arrangement, would cause the liquid crystal cell and between the liquid crystal cell does not produce moiré fringes.
② dot pattern irregular arrangement, the naked eye will not recognize the uneven brightness.
③ high degree of correspondence with any continuity to meet the filling rate distribution.Coding System lcd module
The current status of network generation methodOLED modules
Avoid liquid crystal cell of the data line, gate line two regularity pattern interferes with the light guide plate of the network, in theory, the most effective way is to make the dot pattern for irregular arrangement, but in fact, if the cause irregular arrangement of overlapping networks, the The site will become bright spots or dark spots, in addition to the filling rate of distribution outlets pattern if there is non-uniformity occurs when uneven brightness on the visual phenomenon, in other words the ideal dot pattern must have the following three conditions:
① dot pattern was highly irregular arrangement, would cause the liquid crystal cell and between the liquid crystal cell does not produce moiré fringes.
② dot pattern irregular arrangement, the naked eye will not recognize the uneven brightness.
③ high degree of correspondence with any continuity to meet the filling rate distribution.Coding System lcd module
LED bonding
The purpose of bonding the electrode lead to the LED chip, the finished product lead connections inside and outside work.COG LCD Display
LED is a gold ball bonding process welding and aluminum wire bonding two kinds. Right is aluminum wire bonding process, the first electrode of the LED chip first point on the pressure, and then the aluminum strands to the corresponding bracket above, the pressure on the second point after tearing aluminum. Gold ball bonding process is the first point in the press before burning balls, the rest is similar.
Bonding the LED packaging technology in the key, the main process is the need to monitor the bonding gold (aluminum) wire arch shape, spot shape, tension.
On the bonding process in-depth study into the various issues involved, such as gold (aluminum) wire material, ultrasonic power, pressure welding pressure, chopper (steel mouth) selection, chopper (steel mouth) trajectory and so on. (The figure is the same conditions, two different pressure out of the chopper pad microscopic photographs, both of which there are differences in the microstructure, thus affecting the quality of products.) Here we no longer tired.Lcd display modules
LED is a gold ball bonding process welding and aluminum wire bonding two kinds. Right is aluminum wire bonding process, the first electrode of the LED chip first point on the pressure, and then the aluminum strands to the corresponding bracket above, the pressure on the second point after tearing aluminum. Gold ball bonding process is the first point in the press before burning balls, the rest is similar.
Bonding the LED packaging technology in the key, the main process is the need to monitor the bonding gold (aluminum) wire arch shape, spot shape, tension.
On the bonding process in-depth study into the various issues involved, such as gold (aluminum) wire material, ultrasonic power, pressure welding pressure, chopper (steel mouth) selection, chopper (steel mouth) trajectory and so on. (The figure is the same conditions, two different pressure out of the chopper pad microscopic photographs, both of which there are differences in the microstructure, thus affecting the quality of products.) Here we no longer tired.Lcd display modules
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