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 .

TV purchase these your attention yet

LED is better than LCD picture quality

This rumor logic is clear: Since the LED TV is the latest out, then the quality is certainly better than in the past with CCFL backlight ( commonly known as LCD) LCD TV is good. What this really true ?
As mentioned earlier , LED TV's biggest advantage is long life , high brightness, low power consumption, small size. As to the quality better than that of LCD, but also depends on the spectral characteristics of the LED , high- performance focusing on only those LED TVs , by using particles of a high-performance LED , combined panel and picture quality processing techniques to achieve high quality. In addition , in the past , when the LED TV does not appear , there are many high-end LCD TV by using a high performance CCFL backlight and panel to achieve a high quality , which is the same reason.

5 = buy buy LCD TV panels


LCD panel LCD TV sets accounted for more than 70 % of the cost , this is not to deny the fact . But does that mean that buying a TV panel is to buy it ? The answer is of course no.
The following reasons:

1 , the LCD panel only occupy a larger share of the costs of the machine . For "good" TV and " bad" TV is the same.

2 , bucket theory tells us that the key factor in determining good or bad thing is how short the shortest piece of board , rather than how long the longest piece of board . So if only the LCD panel is good,20x4 lcd display the other bad parts , but also can not make a good TV.

3 , even the best LCD panel plant , out of the products have quality differences. Can not say that so and so long as it is produced in a liquid crystal panel is good, so and so is the production of LCD panels bad .

6 , hard screen than the soft screen strong , impact

This statement is more popular in the last year , many consumers once considered hard-screen LCD TV in front of the screen adds an extra layer of protection , so the more solid , impact resistance. At that time a lot of sales in stores selling television sets in order to prove himself with a "hard screen" , will hand to knock , push the TV screen , in order to prove their strong sales of the TV screen , and durable.
In fact, the difference between hard and soft-screen in the direction of the liquid crystal molecules are arranged just different decision . Hard screen and no additional protective layer on the surface, so it does not seem to be more solid than the soft screen , impact resistance.

In fact , the biggest difference between hard and soft-screen or display different characteristics , focusing on hard screen color reproduction of authenticity , but generally not as soft contrast screen ; soft screen contrast generally good , but the color is more obvious tendency . In fact, this is the difference in style ,Character LCD Modules and physical structure , is strong, durable , and no significant relationship .

3D movies really hurt the eyes do

3D TV is a recently popular new things . But now there are a lot of people say that 3D movies hurt the eyes ,character oled then it really true ?
3D content itself is actually no damage to the eyes . Because we humans are in fact seen every day 3D stereoscopic images . There are still a number of medical institutions in the use of 3D content for young people to correct myopia and treatment , we can see , 3D does not contradict itself and the vision health .

As some people get dizzy watching 3D , uncomfortable , this is actually about and display device itself . For example, some 3D TV in 3D mode due to the lower refresh rate, flicker strong sense , it is easy to arouse the viewer's visual fatigue ; also some 3D sources when shooting because there is no good debugging equipment, resulting depth of field problems, this picture also being looked likely to cause visual fatigue and even nausea , TFT LCD Display uncomfortable. All these questions can not blame onto 3D concept.

LCD screen, PDP screen, DLP big-screen TV wall

In the growing field of surveillance technology, high-definition monitor will also be a shining star, re-examine it in the light of the world around us. With the increasing development of monitoring technology, high-definition surveillance technology as one of the main directions of development, combined with network technology brings new changes, competition in the market continue to meet demand, tend to think about a rational, high-definition monitors are is a high-profile, high demand into our world.

LCD LCD TV wall mosaic

LCD LCD splicing DID Korea currently represented on the display market although there SHARP, LG, NEC and other brands, but DID outshine its excellent value for money in the LCD panel stitching techniques. The so-called large-screen LCD LCD, LCD display unit is the use of mosaic way through splicing control software system to implement a large-screen display screen body mosaic effect.

As a TV wall mosaic display terminals, OLED Display Despite these advantages, but as a mosaic TV wall display unit, its shortcomings are fatal: it is the current patchwork teach their large, and the display unit in the three largest TV wall mosaic, so many Users had to reluctantly give up. LCD TV wall mosaic with a thin, light weight, low power consumption, long life, no radiation, etc., and its delicate screen, high resolution, excellent performance on key performance indicators, has made it become the mainstream of development prospects.

Large plasma-screen TV wall system

Plasma display panels (PDP) is a use of gas discharge display technology, which works with the lamp is very similar. It uses a light emitting element such as a plasma tube, each plasma tube corresponds to a pixel on the screen, the screen as a glass substrate, spaced from the substrate, forming a discharge space. Filled into the discharge space neon, xenon, an inert gas mixture as a working medium, the inner surface of two glass substrates coated with a metal oxide conductive film as the excitation electrode. The plasma discharge generates ultraviolet rays, ultraviolet rays excite phosphor coated with red, green and blue phosphor screen, visible light emitting phosphor screen, the image appears. When added to the voltage on the electrodes, the discharge space of the mixed gas plasma discharge phenomenon will occur, also known as plasma effects.

DLP TV wall system

DLP. This technique is to first go through a digital video signal processing, and then the light is projected. Specifically, DLP projection technology is the application of a digital micromirror chip (DMD) to do the key elements to achieve digital optical processing. The principle is that a light source by an integrator (Integrator), homogenizing the light, the three primary colors through a color wheel (ColorWheel), separating the light into R, G, B three colors, and then imaged by the lens color DMD on.

Currently, more common large-screen TV wall system, according to work is usually divided into three main types of display units: low temperature 160x160 lcd TV wall mosaic display unit, PDP display unit and DLP rear projection TV wall mosaic mosaic display unit. The former two of which belong to the flat panel display unit splicing system, which belongs to the projection unit splicing system.

Some advantages of commercial LCD display

There are a lot of users do not understand, commercial and civilian display screen exactly what is the difference? Today, the difference between a simple presentation on screen between commercial and residential, hoping to help netizens.

1, clarity

Common display devices support only a few TV common resolution specified in the instructions. Because the resolution is only a few civilian television signals, television LCD screen resolution as long as several civilian users based on common use was more effective treatment, a special resolution will result in the video. Commercial display with intuitive features to reflect the image quality, combined with full 1920 x 1080 resolution display for the field of radio and television equipment selection, the LCD screen is the preferred choice of professional display resolution is automatically adjusted according to the display resolution output rate (regardless if they had to support); its high reliability and high-definition display capabilities will ensure that you can record high-definition video edited, the video signal is displayed in the viewer a complete front.

2, stability

Commercial display products usually require 24 hours non-stop operation to meet the needs of a variety of information display, and a display device using the environment than the civilian environment is much worse, the performance of the product which made a higher demand.

And compared to the ordinary display devices, the design, the current commercial display, power, temperature and resistance to electrical interference, capacity and electric shocks margin and the average time between failures are much larger than the former. In the selection of components, various components of the voltage characteristics, current, temperature, humidity and other providers must use significantly higher than TV components; commercial display must also use fully shielded metal case ensure electromagnetic compatibility and interference.

Normal aging display device manufacturing machine in the pipeline is usually energized about 8 hours at room temperature, and the aging machine supplier obvious need in the high temperature and humidity in a closed environment of aging pipeline aging electricity for more than 24 hours to ensure the machine stability. On installation, commissioning, especially components and the aging process requirements, business requirements are significantly higher.

3, Panel

Although commercial and civilian display TFT LCD panels are used, but there is a big difference between them. The biggest difference between them mainly in the size of the liquid crystal molecules, image processing and color, brightness and contrast, viewing angle and so on.

Ordinary LCD display is more important to performance of the entire screen, a small part of the request is not very demanding, more important is the use of a liquid crystal can reduce the cost of macromolecules. Liquid crystal molecules than ordinary LCD panel 256x64 oled display screen to big business, because commercial display when viewing distance is generally not more than one meter, the most important thing is to show the details of the liquid crystal molecules are smaller, Of course, this panel cost is more expensive.

4, the interface

Of course, there are many common display devices also have a RS-232 control port, but its use is basically just used to control lighting, etc., and can not be achieved in industrial control. Because the feeder demand, commercial displays general use industrial port, such as the color RGBBNC with interface and professional video interface DVI-D self-locking mechanism and so on. In addition, suppliers can be significant S232 serial control, password control and open up to more than 200, to adapt to a variety of industrial environments. Easy to use multi-display, not by remote control can control all display devices, and be able to assist, boot time, delay boot, self-test machines and other industrial requirements.

With the continuous development of display technology, in addition to civil, many display manufacturers have launched a commercial display products, these products are mainly used in many public display areas like subways, airports, shopping malls, etc., used to display a variety of real-time Information for people's daily life provides a great convenience. TFT LCD Displays has become a modern society, people work and live essential equipment.

LCD panel can show the number of colors

In the purchase of Graphic LCD Display TV, in addition to often see the screen size, resolution, brightness, contrast, response time specification parameters, often we will find that there is a word called "Colors." Different brands and models of LCD TVs for the description of the number of different colors, the corresponding figure is night and day to another, some marked only 16.7 million, some labeled as 1 billion, as well as a more exaggerated marked as 28.9 billion. So, what these numbers represent what the meaning behind its products can reflect much difference between it?
 
LCD TV can show a number of colors by what factors determine it?

First, we have to be cognizant of two completely different concepts, one is the LCD panel can show the number of colors, an internal circuit is capable of handling the number of colors, both of which are related to the lcd modules TV can be displayed delicate color gradation extent.

LCD panel can show the number of colors

LCD panel can be expressed by the number of colors inherent physical characteristics of the panel decision. According to the basic principle of the liquid crystal display image, the liquid crystal molecules by two glass substrates attached to the upper and lower driving voltage between the occurrence of the corresponding deflection angle, the light through the liquid crystal layer when the angular deflection according to the size of the liquid crystal to obtain different levels of transmission, the This is reflected in the panel have different levels of gray scale contrast. When light passes through the liquid crystal layer needs through the filter, the filter corresponding to each pixel is divided into red, green, and blue small squares, the original white light from these small squares separated out after filtration , the entire panel can present a variety of colors, which is colorful screen display panel simple principle.

LCD driving principle


The liquid crystal panel of the full color image forming process
From the above description it can be seen, the panel can be expressed by the number of colors of the liquid crystal drive deflection angle of the degree of sensitivity. Assuming deflection voltage variation and LCD is divided into 256 steps, then when the voltage generating a step change in the liquid crystal along the angle of deflection of an order, so the panel can show a color change of order; However, if the voltage to produce a step change When the liquid crystal molecules did not produce a corresponding first-order angular deflection, then no one step on the performance of the panel color changes.

Therefore,OLED Module  there is a liquid crystal panel, the number of colors can be expressed concept, which is determined by the panel of the innate physical properties. As in the display people tend to care about what is TN panel or a VA panel, largely because TN panels can be demonstrated by the number of colors as rich VA panel, showing a level of less than VA panel screen delicate vivid. Of course, the above description is idealized assumption, I just hope that this can be expressed in a more intuitive and easier to describe the problem.

Plasma maintenance Cheats

With the current plasma TV technology updates, and more friends to buy a plasma TV, especially like to see blockbusters and friends to play the game even more keen on plasma TVs, lcd module plasma TVs this is because the technical advantage. Here I explore with you when maintenance Plasma TV will pay attention to.
1 Remember to avoid the heat, tide, dust

High-power plasma TV is well known, so we must ensure that its cooling effect, or if improper cooling on plasma screens will cause fatal injuries, and even burned. When the TV is turned on items not covered in the machine, and pay attention to ventilation. Resting period of time to pay attention to every clean dirt, dust and static electricity to prevent this "invisible killer", and to pay attention to moisture.

2 Avoid long-term fixed image

Early plasma products in a long time after use prone to the phenomenon of localized scorch the screen, so the screen long stay in a screen, just like people do not quite work and no rest in each state of the plasma chamber shine long the same circumstances, the screen will stay on the screen like a shadow lingering. So be sure not to let the long-term plasma TV on the same screen freeze, to avoid such irreparable damage.

3 Wipe the screen to be careful

On the screen by the electrostatic attraction of dust is inevitable, we often want to clean the screen. But did you know that if improper cleaning can also cause damage to the screen, and then to the quality of the effects regret. First, wipe the screen not too often, and the best special screen cleaning material or soft cotton cloth. Also, lcm module do not use chemicals to clean, otherwise it will damage the screen surface is used to enhance the effect of the oxide protective film screen. Water is not very good cleaners, because it will leave water marks on the screen. It is preferable to use a plasma screen cleaner.

4 Remove TV technician to please

If you need to remove plasma TV, be sure not to do it yourself. Because you do not know what parts more critical components, damage to yourself once a key component will cause TV Mishap, so then may outweigh the need to replace parts. And with the high-voltage plasma screen is, and very easy to dismantle an electric shock, this is closely related to life events. Refrain from reckless act.