MOS tube drive lcd module

Compared with the bipolar transistor is generally believed that the MOS conduction current is not required , as long as the GS voltage is higher than a certain value , it. This is very easy to do , but we also need to speed.
Can be seen in the structure of the MOS transistor , parasitic capacitance between the GS, GD, and the driving MOS transistor , in fact, is to charge and discharge the capacitor .Tsingtek TFT LCD Displays Charging the capacitor requires a current because the capacitor to charge the capacitor can be instantly seen as a short circuit, so the instantaneous current will be relatively large . Select / design MOS tube drive the first to note is to provide instantaneous short circuit current size.
Note that the second , NMOS commonly used in high-side driver , need to be turned on when the gate voltage is greater than the source voltage. The high-side driver MOS transistor is turned on when the source voltage and the drain voltage (VCC) the same , so when the gate voltage than VCC big 4V or 10V. If the same system , to get larger than the VCC voltage , the boost circuit is necessary to specifically . Many motor drives are integrated charge pump, it should be noted that the choice of suitable external capacitor to get enough of the short-circuit current to drive the MOS transistor .
Said above 4V and 10V is a common turn-on voltage MOS tube , of course, need to have a certain margin design. And the higher the voltage , the faster conduction , conduction resistance is smaller. Now there are smaller turn-on voltage MOS works in different areas , but in 12V automotive electronic systems, general 4V conduction suffice.
MOS tube drive circuit and loss , you can refer to Microchip 's AN799MatchingMOSFETDriverstoMOSFETs. About it in detail ,
MOS tube application circuit
MOS transistor is the most significant characteristic of a good switching characteristic Tsingtek lcd display 2x16, which is widely used in the electronic switching circuit needed , such as switching power supplies and the common drive motor , there are lighting dimming .

Display principle LCDTFT DID lcd module screen features and analytical

LCD (LiquidCrystal) that liquid crystals , both as a liquid ( energy flow ) and like crystals ( optical properties of crystals ) of the material. Alignment of liquid crystal molecules have a certain order and arrangement of liquid crystal molecules will change under the influence of external electric field, thus affecting its optical properties.
LCD (LiquidCrystalDisplay, abbreviated LCD) is a thin glass plate constituted of two parallel , the distance between the two glass sheets is very small, is filled with liquid crystal is divided into small units . LCD panel itself does not light , it is through the LCD backlight to make the Tsingtek Character LCD Display screen lights up . Advantages of LCD screen is small, light weight , large area display , image stabilization, no radiation, low power consumption and environmental protection features . Compared with CRT monitors, LCD monitors power consumption CRT only 1/3 of the thickness of only 1 / 8 , weighs less than 1 /3 of the space savings of more than 60 %.
TFT LCD (Thin-FilmTransistor), abbreviation thin film transistor liquid crystal screen is the top material belonging to an active matrix type liquid crystal screen , the back has a special lamp, can be " actively " on each individual pixel on the screen control , which is what we often say that the active matrix TFT, it reacts faster , viewing angle , color saturation. Due to the arrangement of TFT LCD screen has a memory , so no restitution immediately after the current disappears , effectively improve the ability to play a dynamic picture .
What is DIDTFTLCD?
DID (DigitalIntelligenceDisplay) Tsingtek TFT LCD Module is dedicated LCD screen. It is based on the technical requirements used in security , radio and television , medical, industrial , and public areas such as media, publishing professional monitors designed and produced , following the NB, PC and fourth generation of LCD TV products . Its excellent display performance , has been recognized as the most high-end, the best LCD monitor screen.

On the camera's LCD screen

1 you see may not be what you get

Many of my friends like to shoot in RAW format . But in fact when you're shooting in the LCD view when the LCD screen is presented JPEG preview . So , if you see the color, contrast and exposure are not you ask it, do not panic , the file you are actually shooting will contain more data to be adjusted on a computer after the operation .

In addition , we found that the image displayed on the LCD screen than your final printed photos more vivid in color ,Tsingtek OLED modules brightness, stronger, clearer images and more . The reason is that the small size of the LCD screen or backlight illumination , so some exposure and focus on other issues tend not to be perceived by the user.

2 You can zoom through the LCD screen to find the problem

Whether it is a digital DC or digital SLR , its LCD screen can be used to enlarge your picture taken . By enlarging the picture, you can focus pictures taken timely query whether Indeed, the use of depth of field is in place .

3 composition functions can help you

Squares line is almost every digital camera has a function. Squares line can help you through the LCD monitor to compose the shot . ( Digital SLR camera in LIVE VIEW can be presented with the next viewfinder ) .

Using this grid, allows you to take pictures when the composition to ensure the horizon level, to remind myself not to be placed in the middle of the main shooting screen , or check the optimum location of the building trapezoidal distortion and so on.

4 shows a histogram parameters such information

Exposure, brightness histogram from dark to light transition tables and other information have some basic ideas for people photography is very necessary information. After early photographs , watch the histogram trend that lets you know where the photo had burst ( burst over the area will flash to warn ) in order to allow you to make adjustments before the next shot inside the machine .

Many cameras have an independent three-color RGB graphics table , this set of graphical information can help you see in the picture color performance degree . You can find very quickly lost picture is a particular color detail .

Proper use of color histogram lets you photograph in black and white images look richer detail . For example, you shoot red roses and red channel histogram shows that you do not have access to clean moist histogram trend lines , then your performance is certainly lack the red details .

5 By the late Tsingtek COG LCD Display screen image

Now, many digital cameras are built in the latter part of the organic function , although the effect is really simple but very good. You can choose a different color style , and then through the LCD preview.

In addition, the machine also has a lot of camera cropping, and some simple beauty effect. These can preview and save your favorite proofs under the LCD screen .

Buy a LED LCD celebration

Spring will come, and a larger , clearer, especially on television excellence dynamic definition naturally become indispensable stocking purchase order items . And with the LED LCD TV hot , many consumers face an array of LED LCD TV products, often at a loss . So how can buy roses TV ?

Tips to buy one: see picture

HD LCD TV is good or bad , mainly due to the following factors: LCD panel , contrast, refresh frequency.

Said first panel . Current mainstream LCD panel is divided into two kinds of hard- and soft-screen , such as LG Display IPS hard screen is horizontal arrangement of liquid crystal molecules in parallel with the panel in response speed , uniformity of better than soft screen .

Besides the contrast. The higher the contrast ratio , the picture is even more bright white , black, more dark , that is, its color display richer . Contrast like LG some television can reach 3000000:1 , this picture will be more structured , details also performed more delicate.

Finally, the screen refresh rate. Smearing the LCD TV has been criticized for many manufacturers launch high refresh rate , such as the SL90 's 100Hz screen refresh rate , whether it is watching sports or playing sports games , all with ease.

Optional Skills II : Look signal

TV election goes , it is better signal reception is good. With high-definition LED TV , to see high-definition programs, such as "HD Spring Festival" , but also a high-definition signal for the job .

In the optional LED LCD television, digital television depends on the function of this product are complete , such as whether to receive " terrestrial digital signal," support " HD programming card insertion " and so on .

Optional Skills III : Look Appearance

If the home has a stylish design with a slim LED Tsingtek Graphic LCD Module TV , both decorate the home, but also enhance the taste. Even without power , the people will surely win acclaim . For example, LG SL90 unique frame design , using a separate texture with thin glass mirror panels, without the slightest gap and margins , creating a unique extension of boundless beauty .

Optional Four Skills : see additional features

With the rapid development of science and technology , TV is not just TV , it should be a monitor , a video game , or even a home entertainment center.

In addition , a wireless connection with Bluetooth mobile phones, computers , MP4 and other digital devices , viewing pictures , videos and music on your TV , so the TV can thoroughly into a family entertainment center. In addition, the late night TV show to watch when you can still wear a Bluetooth headset , does not affect the family rest, is an accessory worth its user-friendly features and optional LED LCD TV brings an indispensable consideration when standard .

Overall, pre-holiday buy LED Tsingtek low temperature lcd display TV is a technology live . Panel to take into account not only the type of the product itself is directly related to the performance , appearance, function and so on, but also comprehensive technical strength and market performance analysis vendors. The slightest mistake will inevitably fall into the trap of propaganda.

Shot ultra-stable hard-screen LCD TV is king

Today's flat panel TV market turns out to be squandering charming eyes . Not only in terms of price , quality , performance is fairly mature traditional LCD TVs are very active, and accelerate the adoption of LED LCD TVs and 3D TVs also debut should not be underestimated . So for consumers, how do we buy into a versatile products?

LCD TV panels accounted for more than 70% of the cost , is the core component of LCD TVs. Notably , the panel on the market are "hard screen" and "soft screen " points. Soft -screen liquid crystal molecules recovery is slow , the screen is unstable. In contrast, hard screen has a clear advantage : When the touch , no " Watermark " phenomenon. Even when subjected to external forces beating and shaking , it will not interfere with a hard screen showing a smooth, clear picture. For this reason , IPS hard screen technology also has ultra-stable hard screen , and " touch the selected hard screen " LCD TV selection method has also been widely used.

LED TVs are hot at that time , it has a stylish ultra-thin , fine quality , green energy-saving features, is the perfect choice for many consumers eyes. However , note that , LED LCD TV market is divided into direct type and edge-lit . The difference is that side- advantage in the slim design and cost , but also the most widely used applications ; rather direct style is more concerned about the quality of user choice. Also , buy a high- quality LED LCD TV screen to distinguish between hard and soft .Graphic LCD Display As the molecular conversion speed hard-screen LCD screen 10 times faster than the soft , so when displaying fast motion picture , better able to ensure a clear , smooth and realistic effects .

For in the initial stage of 3D TV , the general view is that the industry , 3D TV on the LCD screen of the requirements will be more stringent than 2D TV. Because the 3D TV technology is relying on the principle of super-fast screen refresh rate and shutter glasses fit , so that the two vice complete picture formed at different times of persistence visual overlay. For this reason , many manufacturers have chosen the response speed of the liquid crystal molecules advantage of IPS hard screen panel. With Trumotion480Hz technology , 3D realization of a second screen is refreshed 480 times , and through the " flashing light " technology compatible , to minimize the result of his eyes " about interference " occurred " ghosting and dizziness ," and so on. Therefore, in the 3D TV can withstand a higher price , the one based on 3D TVs IPS hard screen technology will become the first choice .

Bluntly "LCD TV screen is the pick ! ", Although somewhat definitely speaks these words , but considering the merits of the Serial Lcd Display Module and image quality for LCD TVs have a decisive impact on the election -screen LCD TV really is purchase of a key ring .

CCFL LCD backlight Analysis of strengths and weaknesses

Most LCD monitors on the market are based on CCFL (cold cathode fluorescent lamp ) backlight. CCFL backlight design are mainly two: " side-in " and " straight sets " type , but because of the side- by optical light guide design allows high attrition rates , thereby allowing the backlight brightness of the subject , the brightness of the larger panel size lower , in general, when the liquid crystal panel size over 15 inches , the backlight brightness will be significantly reduced. So we use at home are usually large-size LCD Teluk style .

Teluk type CCFL backlight module does not require a light guide plate , breakage problems are more dull , so I do not need the brightness enhancement film , especially a minority brightness enhancement film industry's patented technology , expensive, Telok style guide can be omitted brightness enhancement film and the optical plate , the cost can be significantly reduced.

But here and there is a problem , the use of Teluk type CCFL backlight LCD, panel size larger the proportion of the cost of its share of the higher backlight module , there was statistical point out that the same is to use straight sets type CCFL backlight module , when 15 inches backlight module cost only 23 % of the total , but it increased to 30 inches by 37% , and the estimate to 57 inches , backlight module cost share will reach 50% . So, Teluk type CCFL backlight only suitable for use in 30 inches or so medium-sized LCD, is not suitable for use in the design of a larger area .OLED Display Meanwhile , CCFL is the use of mercury to produce the gas discharge lighting, although the RoHS EU entered into , as long as "Mercury " dose below standard still acceptable , but no one can guarantee the future is likely to raise the standard to zero content ( do not allow use ) , then CCFL will not be used, or be diverted to non-mercury type CCFL.

Even non-mercury type CCFL technically feasible, but is still confined CCFL light tube of gas-discharge electron illumination , light tubes resistant to external force is limited by the resistance , the larger the collision will cause light pipe rupture, so the lighting failure. And in order to enhance the brightness of the screen , you must increase the number of fluorescent tubes , and then the optical density of the light pipe arrangement is too large will have a huge amount of heat , which will heat the liquid crystal forming a great challenge. Therefore, in order to ensure the heat, the only viable solution is to increase the volume of the liquid crystal.

Incidentally that the use of large -inch CCFL lcd module TV on the number of fluorescent tubes , light pipe length must also be increased due to the number of inches and growth, but longer CCFL light tube with both ends of the middle of the light pipe will prone to brightness and color MURA MURA problems , thereby affecting all of the backlight light , in order to continue to maintain the light are , you must spend to enhance light diffusion film have degrees, but the proliferation of film will bring light transmittance of breakage , reducing the brightness , the results had to reduce the brightness to increase the number of the light pipe to the reinforcing way , but the previously described : the light pipe will increase the heat difficult to design , to increase the thickness of the backlight module , the power consumption increases even under statistics, electricity CCFL backlight LCD TV accounted for 90% of overall electricity consumption high . So, change the backlight technology is one of a change in the direction of the current LCD picture quality .