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1、笔记本液晶屏改液晶显示器一法（Notebook LCD screen change LCD one）Notebook LCD screen change LCD oneI. The data interface types of all TFT-LCD:Single TTL6 bit (8 bit)Dual TTL6 bit (8 bit)Single LVDS6 bit (8 bit)Dual LVDS6 bit (8 bit)Single TMDS6 bit (8 bit)Dual TMDS6 bit (8 bit)And the latest standard, RSDS6 bits a
2、nd 8 bits are used to show the screen can display color number 6 screen can display 6 times 6 times 6 times for X2 color X2 2 of the R G B on behalf of three primary colors, count down the 6 colors for the screen can display up to 262144 colors, the 8 screen is 16777216 color. The screen shows how m
3、any colors are related to the number of screens. Our books are usually 6 - bit screens.The early books are 12 inches below the screen, the screen resolution is 640X480 (VGA) 800X600 (SVGA), using the TTL6 interface for the single screen, pick 41 pin pin and 31 pin, 12 inch to 41 pin, 10 inch majorit
4、y (800X600) to 31 (most of the needle 640X480). The TTL signal is the standard signal that TFT-LCD can recognize, even if the LVDS TMDS used later is encoded on it. TTL signal line, a total of 22 roots (not counting and minimal power, the other is R) G B three HS VS two color signals, a field synchr
5、onization signal, a data enable signal DE a clock signal CLK, each color R G G in three primary colors according to the screen the number is different, and different number of data lines (6, 8 and 6 points) and 8 screen three color screen respectively R0-R5 (R7) G0-G5 (G7) B0-B5 (B7) three color sig
6、nals is the color signal, then the wrong will make the screen display color. The other 4 signals (HS, VS, DE, CLK) are the control signals, and the wrong connection will cause the screen point to fail to display properly.Because the TTL signal level is about 3V, it has great influence on long distan
7、ce transmission with high speed, and the anti-interference ability is also poor. So after the emergence of the LVDS interface screen, as long as more than XGA resolution screen, are using LVDS mode. LVDS is also divided into single channel, double channel, 6 bit, 8 bit, and the principle is the same
8、 as that of the TTL method.LVDS (low voltage differential signaling) the working principle is to use a special IC, TTL channel encoding input into LVDS signal, 6 to 4 groups of difference, 8 to 5 groups of difference, the data line name for D0- D0+ D1- D1+ D2- D2+ CK- CK+ D3- D3+ which is the 6 scre
9、en if there is no D3- D3+ that a set of signals, the encoding process is completed in our computer motherboard. On the other side of the screen, also has a similar function of IC decoding, the LVDS signal into a TTL signal, with the final screen or TTL signal, because LVDS signal level is about 1V,
10、and the line between and + line interference can offset each other. So anti-interference ability is very strong. Very suitable for use in high-resolution high rate screen.Due to the high score screen 1400X1050 (SXGA+) 1600X1200 (UXGA) resolution is too high, the signal rate also increased, by way of
11、 LVDS transmission has been overwhelmed, so they are using a LVDS dual interface, in order to reduce the rate of each road LVDS. Ensure the stability of the signal.XGA screen for notebooks,Generally 20 pin flat interfaces, corresponding to the interface defined as1 VCC2 VCC3 GND4 GND5 D0-6 D0+7 GND8
12、 D1-9 D1+10 GND11 D2-12 D2+13 GND14 CK-15 CK+16 GND17 empty18 empty19 empty20 empty.The high definition screen uses a 30 pin flat interface defined as:1 GND2 VCC3 VCC4 empty5 empty6 empty7 empty8 DA0-9 DA0+10 GND11 DA1-12 DA1+13 GND14 DA2-15 DA2+16 GND17 CKA-18 CKA+19 GND20 DB0-21 DB0+22 GND23 DB1-2
13、4 DB1+25 GND26 DB2-27 DB2+28 GND29 CKB-30 CKB+Two. Analysis of the structure of LCD:LCD now consists mainly of glass substrates plus backlit panels. The glass substrate itself does not emit light, and the light transmitted by the back light of the back transmits it to the glass substrate so that we
14、can see the image. The glass substrate in the outside, is in front of our eyes on this side, a layer of polarizing film, we usually say that the screen is scratch, scratch the film, can be changed, basically do not need what tools to screen, open, remove frame, gently with a knife to scrape down the
15、 film polarizing film are sticky, very tight, only a little bit of scraping knife. Must be careful, if not careful to the glass substrate to scratch, ha ha! Thats the permanent scar. Oh, when the old Polaroid comes down, first clean the glass substrate, and use a little bit of paper towel and a litt
16、le bit of absolute alcohol. Make sure it is bright and bright. Dont leave any dust on it. Otherwise, the dust is a dirty spot. It doesnt look very good. Then put a layer of protective film on the new polarizing film removed, polarizing film is removed after like a sticker like, stick to the side of
17、the glass substrate, the neat glue on OK, when you must stick slowly, do not leave the bubble, if there is a bubble repeat just now, until well done. It is important to note that not all polarizing films are versatile, and polarizing films have an angle of 135 degrees, 90 degrees. 45 degrees of seve
18、ral, if not corresponding to the point and LCD, display color color, like red blue should place. The black place is white. There is a way to know the angle of the polarizing film, that is, after getting down the old film, compare it with the new film on the screen to see if there is a normal image (
19、the premise is to light the screen). Yes, thats right. Now, a 1415 inch polarizer sells around 14, but you have to charge $100 for JS, so you know how dark JS is. Ha-ha！When the LCD is used for a period of time, the brightness will be reduced to some extent. For the slight brightness, the lamp can b
20、e replaced to replace the lamp. After the change, it can be restored to the new screen. But some LCD aging is really serious, such as serious yellow, edges and corners have yellow edge, these screens are generally lamp aging and backlight aging. Just replacing the tube improves brightness, but it st
21、ill turns yellow after changing,With only edge backlight replacement have good effect, replacing the lamp, to remove the tail to the bottom, is to remove the back light inside layers of reflective film, and the back plate. Because the tube is usually installed on the outer frame of the LCD, the atte
22、ntion is still to those points, dustproof, take the back light that several reflective film, it is best to take their side. Do not use your hands to direct the middle of them, otherwise they will leave a fingerprint, installed after it will leave a white spot like fingerprints, at night looks terrib
23、le. Ha ha, if you have printed fingerprints, you can use paper towels to add water, paint, and you can not see the fingerprint until. For some of the screen will be the line, because the binding on the glass substrate and the circuit board side of the soft cable, one of the broken, or the connection
24、 is not good. The screen is out of line, generally not recommended repair. Because of the need to rebind the soft line is to have a line of special equipment, but some domestic equipment repair screen is ultimately less than the original, it is often just a few days to repair is good, but after a pe
25、riod of time, the local pressure will fall off, because when the change of soft screen repair the cable is a group of a group change (usually a group of 200 lines), after a period of time may be set off, then the line will be more. If you want to fix it, you can consider selling it to JS. And can re
26、pair the cable screen company charges odd expensive, Shenzhen this side price is 150 yuan a line. After the repair service is: go out is not guaranteed. Ha-ha！In short, if it is to open the screen, it is best to find a clean room, change the film, change the tube, LCD inside can not fall visible dus
27、t. Another plus, notebook LCD response speed of about 30MS, look at DVD, and TV when, feeling trailing is not very serious. Acceptable.Three, VGA interface LCD display principle:Analog PC B (R G HS VS) input to a dedicated LCD driver IC, in the IC inside the first ADC conversion, the analog signal i
28、nto a digital signal, and then after SHRINK scaling. Because the screen resolution is certain, such as the 1024X768 screen, the screen is 1024X768XRGB pixels, if we want to display for the 640X480 mode, will be through a special algorithm to merge the three pixels into two, or a. If the zoom doesnt
29、work well, it will come out like our IBM T2X series laptop for full screen display in 640X480 800X600 mode. Its just the limit. But now the driver IC used in the display, in this regard, are still very good, and basically looks the same as in the 1024X768 effect, character edge is also very smooth.
30、Before the data signal comes out, a OSD control interface is superimposed inside the IC. That is, the control icon of the monitor we use. After this series of signal processing, the IC outputs the TTL signal that the screen can recognize. For the TTL interface, the screen can be used directly. LVDS
31、interface, but also add one to two (corresponding to single channel and double channel pass), LVDS encoding IC, into LVDS signals. Now there are many drivers, IC has been integrated inside the LVDSIC, so those who drive the IC out of the LVDS signal, you can directly drive the LVDS interface screenN
32、ow the IC market share is relatively large in the United States GENESIS company, as well as Chinas Morning Star Inc in Taiwan.For the TMDS interface, the principle is the same as the LVDS, as mentioned above. TMDS coding is more advanced than LVDS, transmission distance and anti-interference ability
33、 is much better, but basically not in books, to desktop TV, PANEL is more. So we dont discuss much.Generally speaking, the hardware part of the LCD driver board is invariable. With all the interface forms mentioned above (excluding TMDS), only the screen parameters in the MCU can be changed accordin
34、g to the unused LCD to achieve the purpose of adapting to the screen. Because no manufacturers, no models, not size, screen timing of control is not exactly the same. If the drive board and the drive LCD screen parameter (timing) does not correspond. Its not lit. Each model of the screen manufacture
35、rs will have a DATE SHEET to the user, which will have a detailed description of the screen, including timing diagrams. But in my experience, as long as the interface is the same, the resolution of the screen is the same regardless of its actual size (12. 14) is it the same, most of which can be use
36、d in general?.The above is just LCD change PC, if you want to increase the AV -SVIDEO interface, the driver board will also have more than one video decoding IC (VIDEO DECODE). Put the input VIDEO. CVBS signal or S-SIDEO. The signal is converted to LCD to drive the IC to identify the YUV656 formatte
37、d digital signals. Also, when you choose to drive IC, you also have to choose IC with YUV format input, the cost will be higher accordingly. If you want to add the TV function, you must add a digital tuner on the basis of the above. The signal on the antenna is converted into video to decode the CVB
38、S signal needed by IC to realize the function of receiving television. In addition, the TV also increase the audio function, these are easier to do, add an audio power amplifier on the line. You can listen to the music on the TV when you get the speakers.I said the changes to the AV PC were just har
39、dware changes, but if you add these features, the software for the drive board is very heavy. Usually manufacturers debugging, to the customer, the customers own change is impossible, even if you will change yourself, others software source code will not give you.The work voltage of the screen, this
40、 is very important, the higher will burn the LCD, notebook screen general use voltage of 3. 3V, it is better not to exceed this voltage, but the screen has a certain resistance value, if up to 5V in a short time will not be burned.So, to light a LCD, pay attention to the following points:1, interface2, software timing3, work voltage