Lcd Controller
Lcd Controller
China LCD TV modules to get rid of dependence on imports
September 19, Qingdao Economic and Technological Development Zone was established in Hisense Information Industrial Park Hisense TV LCD module production line put into operation officially started. With the first batch of "Hisense made" LCD screen off the assembly line from the production line slowly, almost all of China's LCD TV module status dependence on imports will be completely broken and the Chinese color TV industry in the first LCD module production line was born.
"863" program featuring LED backlight projects, responsible for Hisense module industry technology leaders Dr. Liu Weidong, told this reporter, is the LCD display module, connectors, integrated circuit, PCB circuit board, backlight, the structure the display component parts fit together. "Simply put, the module is commonly referred to as liquid crystal display or LCD panel."
Professor, Institute of Optoelectronics, Nankai University, Tianjin Optoelectronics Research Center, Sun Zhonglin display technology that the Chinese flat panel TV has developed nearly 20 years, but almost all LCD TV module imports. Hisense to develop into large-scale and complete module production line, on behalf of my Lcd Monitor or LCD products really completed a key chain ring. With the diversification of types of display, LCD display module must be combined to determine how upstream module functions, but also for the downstream machine to create conditions for development of new products, so it plays a key role in the technical aspects. Although universities and research institutes can make a lot of preliminary research, but if no one module production base in China, all research can only be pointless, with the official line, in order reflecting the requirements of new technologies and new principles.
"The birth of the LCD tft module production line to seek greater business development will lay a good foundation chu," the State Council Development Research Center of Market Economy Institute deputy director of the lu introduction, it is estimated that in 2007, China's flat panel TV sales will reach 7.6 million units in 2008 will reach 12 million units. Global flat-TV market is expected to reach 8,400 this year, million units in 2008 expected to exceed 100 million units, of which occupy a huge share of the LCD TV.
lu said that due to Screen Lcd TVs accounted for 60% to 70% of the cost, if the master of the upstream module technology, the Chinese brand of flat panel products, will greatly enhance the ability of cost control; Otherwise, the Chinese color TV enterprises will face Edge of embarrassment. Especially with the function of the upstream modules continue to strengthen, China's machine industry continue to reduce controllable costs in the global TV industry will gradually lose the right to speak, "then, China's color TV 'manufacturing power' of the call will be illusory."
Shu Min, president of Hisense Group in the introduction, as early as 3 years ago, Hisense to begin preparation module industry, has completed the project planning module and a goal: the first annual output of 500,000 15 inches to 42 inches LCD TV modules Group production line and body panel repair line put into operation in Hisense. From 2007 to 2009, Hisense plans to invest 700 million yuan in 3-step module production line to complete five of the building. September 19 put into the production line started planning is only the first step, Hisense plans to officially put into operation during the first half of 2008 a second production line. Completed by the end of 2008 a third production line and achieve an annual output of 1.5 million manufacturing capacity.
5 production lines in 2009 completed, then, Hisense TV LCD module with an annual output will reach 3 million. Meanwhile, Hisense will build an LED backlight module production line.
Hisense Group Chairman Zhou Houjian introduction, and then developed the chip as determined Hisense, Hisense decided to do a good job module industry, hopes the chip and the module core part of the two television control and optimize the product, improve efficiency, reduce costs, trying to change the status of China's color TV industry, the rapid increase Hisense competitiveness in the global industry.
"Hisense into the module industry is bigger sound, to avoid the risk of a rational industrial structure and layout of choice." A motion that the whole enterprise involved in R & D and manufacture of modular, re-implement in the industrial chain division and cooperation, give play to their respective professional advantage, will benefit both parties to improve efficiency and reduce costs; benefit based on rapid response to consumer demand, will have new technology and new features of the products to the market often result, with the machine manufacturers and upstream suppliers close co-operation, more variety of products to market quickly, which will promote the development of better and faster flat-panel TV industry.
Liu Weidong introduction, Hisense has been stable for 3 consecutive years, the domestic flat-Panel Television first, the end of 2006, Hisense, "Low Cost Dynamic LED light source system development," won the National "863" program support, which is the first Chinese color TV enterprises bear the "863" projects planned in this area; followed in July of this year, Hisense large-size LCD TV with LED backlight technology development and industrialization and successful electronic information industry development fund key projects, Hisense, China's first self-developed large size LED backlight LCD TV is also simultaneously released the source. "Add Shanghai
In the letter the advantages of video processing chip, enabling more than 60% of the LCD module component independent development. "
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graphic lcd module, character lcd module
Can a Lcd be used without power inverter?
Hey there, i have a 17" dell lcd monitor. The screen is blank so i have no used for it anymore, so i want to make it into a projector.
I did some research and found that the power inverters breaks alot on the dells. My question is can i use the monitor without the back light if the power inverter is broken or is that need or the the lcd controller
The inverter provides a high voltage that is needed by the cold-cathode florescent bulbs that are encased in the back of the LCD panel and provide the light for the LCD material to let though or block.
So, if you can strip the bulbs, light guides and diffusers of the back of the actual panel, without damaging the panel, and get a really bright single point light source while keeping the LCD cool enough, you could build a projector of sorts.
Lcd Controller
Senior design project - lcd controller
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Resistive Touch Screen Lcd Monitor And The Lcd Display
Resistive Touch Screen LCD Monitor and the LCD display is difficult to fully and accurately all the points with, so addition to calibration of precision mechanical assembly technology, the use of software must also be calibrated before. This article describes the calibration method first determine the source of error, and then export the three selected points, touch-screen calibration matrix, and use the software method to implement the corresponding relation between points of calibration. To master this technique for reducing the cost of embedded systems is essential.
Figure 1 shows a resistive touch-screen cross-section, its structure is very simple, from top to bottom the relative placement of two pieces of glass composition, the inner surface of glass coated with a thin layer of conductive material, and used some small glass beads across the surface of the conductive open. When the finger or stylus press the glass surface, the upper contact with the lower glass bending glass. The structure of glass beads determines the distance between the touch screen sensitivity. The more glass beads placed near each other, the sensitivity the smaller the greater the pressure necessary to make reliable contact with two layers of glass.
Touch screen calibration method - mxpopstar - The Frozen Throne
Figure 2 shows the equivalent circuit of touch-screen. Through a touch screen controller (AD converter) to the power of the positive and negative added to a conductive layer of the glass at both ends, and the other a piece of glass on the conductive layer is to play the role of a potentiometer cursor. On glass of different touch points, conducting the situation is different, digital converter will be recorded in the different test voltage value, then controller will be recorded in the voltage value converted into a two-dimensional coordinates: X-axis coordinates and Y coordinates of .
These controllers can be 200 times per second or more of the sample. Sampling rate usually associated with background noise and controls relating to the quality. Intelligent controller also has other features such as touch is detected when the interrupt CPU, it detects a continuous sample rate of touch created before the sample. Do not touch, the controller is in standby mode.
Since resistive touch screen, simple structure, operation easy to understand, there are multiple vendors of hardware and software required to choose from, it can be used for cost-sensitive designs. However, due to its 7 Inch Touch Screen LCD display behind the (LCD or otherwise) between the corresponding points is difficult to fully cope with, so almost all with resistive touch screen equipment in the factory prior to go through a certain degree of calibration. Otherwise, the touch screen by clicking on a button or select a feature, the built-in software will not be able to make the right response to this click.
Touch screen calibration method - mxpopstar - The Frozen Throne
This article describes the calibration method requires three target points / or test points, and then in turn touch the test to determine the screen-specific calibration factor. Final adoption of these calibration factors to the corresponding point of touch-screen display and the actual corresponding points correspond exactly to them.
Source of error
There are several error sources affect the touch screen controller, make it impossible to generate the correct corresponding points X and Y coordinates. The main error source is the electrical noise, mechanical error and the amplification factor. In addition, the operator's misoperation will have an impact, such as finger or stylus press time is not long enough or pressure is not big enough. All of the above errors would generate useless data, it must be corrected in order to compensate for touch-screen work.
In a variety of electrical systems, from the thermal effects or electromagnetic effects as well as system design flaws caused by electrical noise is everywhere. In the touch screen, because the AD converter front-end circuit with high input impedance, it is particularly vulnerable to electrical noise. In addition to touch screen controller with a careful layout of the circuit, we usually increase the AD converter input low-pass filter to solve this problem. In addition, the software can also choose to approach, abandoning AD conversion of the smallest one, two, and use the algorithm allow the error falls outside the scope of some data points removed from the sample stream. The software algorithms can also be eliminating user-generated error.
8 Inch Touch screen calibration method - mxpopstar - The Frozen Throne
Calibration methods described in this paper can be used to solve due to mechanical error and the amplification factors of the error. The circles in Figure 3 under the LCD touch-screen display graphics, oval indicates when the user along the circle, when the image LCD display, touch screen corresponding to the set of points, but somewhat exaggerated. The redevelopment of the graph is clear through a series of rotation, shift and zoom, but also the parameters of transformation in each direction is different. Focus calibration malpractices displayed on the touch-screen graphics through the transformation of this reconstruction, conversion out of the graphics and the LCD display consistent set of corresponding points.
About the Author
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Lcd Controller