CN101493589A - TFT LCD programmable combination property electric logging device and detecting method thereof - Google Patents
TFT LCD programmable combination property electric logging device and detecting method thereof Download PDFInfo
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- CN101493589A CN101493589A CNA2009100375834A CN200910037583A CN101493589A CN 101493589 A CN101493589 A CN 101493589A CN A2009100375834 A CNA2009100375834 A CN A2009100375834A CN 200910037583 A CN200910037583 A CN 200910037583A CN 101493589 A CN101493589 A CN 101493589A
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Abstract
The invention provides a TFT LCD programmable electric logging device used for measuring the comprehensive performance, comprising a control module (1), a D/A conversion module (2), a photoelectric coupling switch module (3), a power module (4) and a keyboard (5), wherein, the control module (1) is respectively connected with the D/A conversion module (2), the photoelectric coupling switch module (3) and the keyboard (5); and the power module (4) supplies the power to the control module (1), the D/A conversion module (2), the photoelectric coupling switch module (3), the power module (4) and the keyboard (5) respectively. The electric logging device outputs the voltage signals of seven changes such as GG, ODD, EVEN, DATA(R), G, B and the like, which can drive the TFT LCD, can generate ten frames such as black, class-one grey scale, class-two grey scale, class-three grey scale, white, red, green, blue and the like, and can detect the defects of the TFT LCD such as black screen, bright spot, bright line and the like. By aiming at the TFT LCDs of different dimensions of different factories, the detection can be carried out only by modifying the software without changing the hardware circuit; and the electric logging device has low cost, high defect display rate and quick detection speed, improves the yield of LCM and reduces the cost of the enterprise. The TFT LCD programmable electric logging device used for measuring the comprehensive performance has convenient detection method and quick detection speed, improves the yield of LCM and reduces the cost of the enterprise.
Description
Technical field
The present invention is a kind of TFT LCD programmable combination property electric logging device and detection method thereof, belongs to the renovation technique of TFTLCD programmable combination property electric logging device.
Background technology
At present, existing TFT LCD can not reach 100% yield rate in process of production, there is defective more or less, do not work, exist defectives such as bright spot or bright line such as the LCD point, therefore, LCD being sticked before IC makes the LCM module, need add electric drive signal to LCD and detect, reduce the waste of IC and reduce cost.
TFT LCD screen mainly is made of materials such as backlight, glass substrate, circuit layer, liquid crystal layer, filter and alignment films.And most probable produce defective just at circuit layer, i.e. tft array layer.TFT practical function such as same switch, liquid crystal such as same electric capacity, in the time of switch closure, signal writes liquid crystal capacitance C
LC, signal remains on the liquid crystal in the time of disconnection.The effect of memory capacitance Cs is exactly to allow charging voltage remain to frame update next time.Fig. 1 is the TFT equivalent circuit diagram of single pixel unit.TFT grids all on sweep trace (Scan line) and this row link to each other, and whether decision TFT gating, and source signal line (Data line) links to each other with this source electrode that is listed as all TFT, to liquid crystal capacitance C
LCCharge.As the voltage V that is added in the G utmost point and the S utmost point
GSGreater than threshold voltage V
ThThe time, source electrode and drain electrode conducting, the liquid crystal capacitance charging reaches display effect; Work as V
GSLess than threshold voltage V
ThThe time, the TFT switch disconnects, and liquid crystal capacitance keeps charging voltage to next scan period.
Because it is constant that liquid crystal molecule can not be fixed under certain voltage for a long time, not so can destroy the revolving property of liquid crystal molecule.But, in the time of the same GTG of display requirement, display voltage can be divided into the positive-negative polarity of same pressure differential with respect to Vcom, like this no matter be that to be added in voltage on the liquid crystal be just or negative, though the sense of rotation difference of liquid crystal molecule, the GTG that shows is the same.When requiring to show same GTG,, reach display requirement like this, also can avoid destruction liquid crystal molecule by replacing of generating positive and negative voltage.At present, for fear of scintillation and minimizing power consumption, most of TFT-LCD adopt the fixedly type of drive of Vcom voltage of some upset, the second order drive principle synoptic diagram that Fig. 2 adopts for TFT-LCD.
According to structure and the drive principle of TFT,, just can reach the effect of demonstration as long as the grid of timesharing ground each row of gating makes source signal be charged to correct display voltage to show electrode.But because production technology or other a variety of causes, all short circuits or open circuit of all signal wires that grid and source electrode may occur connecting, when adding drive voltage signal, full wafer LCD panel is all put and is not worked, and blank screen promptly occurs; Certain row TFT also may occur or connect the drive signal line defectiveness of TFT grid, drive signal that can not be in addition correct to grid causes the grid of whole row not control, thereby signal adds less than on the show electrode, just produces line defect of certain row.Can find when observing that certain row has bright line, illustrates this LCD defectiveness by polaroid; When store electricity perhaps liquid crystal capacitance have defective, time that the back keeps is not enough just may to make certain liquid crystal capacitance not charge or to charge, and causes the error of voltage signal on the show electrode, can find certain bright spot in the time of observation, and this LCD defectiveness also is described.
Summary of the invention
The objective of the invention is to consider the problems referred to above and provide a kind of simple in structure, cost is low, shows to fall into the high TFT LCD programmable combination property electric logging device of rate.
Another object of the present invention is to provide a kind of easy to detect, detection speed is fast, improves the yield rate of LCM, reduces the detection method of the TFT LCD programmable combination property electric logging device of enterprise cost.
Technical scheme of the present invention is: include control module, D/A modular converter, photoelectric coupling switch module, power module, keyboard, wherein control module is connected with D/A modular converter and photoelectric coupling switch module, keyboard respectively, and power module supplies power to control module, D/A modular converter, photoelectric coupling switch module, power module, keyboard respectively.
Above-mentioned control module is single-chip microcomputer U6.
Above-mentioned single-chip microcomputer U6 is single-chip microcomputer Winbond W78E516BP.
Above-mentioned photoelectric coupling switch module comprises photoelectrical coupler U7 and U8.
Above-mentioned photoelectrical coupler U7 and U8 can detect the TLP521-2 of the broken string problem of TFT LCD for realizing exporting EVEN or ODD signal separately, making TFT LCD show single-double-row.
Above-mentioned D/A modular converter is integrated package U9.
Above-mentioned integrated package U9 is D/A converter TLC7225 able to programme.
Above-mentioned power module comprises integrated regulated power supply U1, U2, U3, U4, U5, transistor T 1, T2, and the output end voltage signal GG of T1 collector equals input DC power voltage, by transistor T 1 its break-make of control, as test gating function; V
ComSignal connects common port, by the directly output of power module part; Output terminal EVEN, ODD voltage signal are exactly the voltage signal of control grid.
Above-mentioned integrated regulated power supply U1 is that integrated regulated power supply W7818, integrated regulated power supply U2 are that integrated regulated power supply W7815, integrated regulated power supply U3 are that integrated regulated power supply W7805, integrated regulated power supply U4 are that integrated regulated power supply 78L05, integrated regulated power supply U5 are integrated regulated power supply 78L05.
The above-mentioned keyboard that is connected with control module include by the automatic/hand function button of control module control and before turn over, after turn over some load buttons of function.
The detection method of TFT LCD programmable combination property electric logging device of the present invention, it realizes that principle is the drive principle of simulation LCD, utilize several field effect transistor the signal line of all liquid crystal matrixes and the short circuit respectively of source signal line, as long as pressurize for a signal line and one source pole signal wire respectively, all signal lines and source signal line are all pressurizeed respectively, realize promptly that also the LCD frame drives.
The specific implementation method of the detection method of TFT LCD programmable combination property electric logging device of the present invention is to utilize the waveform generator that can export a plurality of clock signals, overall characteristic according to different model LCD, the total enable signal EN of liquid crystal field effect transistor that output frequency is different with amplitude, signal G1, signal G2, VCOM, source signal S1, source signal S2, source signal S3 and other test signal, the EN signal links to each other with the grid of several field effect transistor of all signal line short circuits of control liquid crystal matrix, simultaneously again with all source signal lines of control liquid crystal matrix respectively the grid of several field effect transistor of short circuits link to each other, make these field effect transistor conductings during EN signal noble potential, all signal line short circuits of liquid crystal matrix, the also all short circuits of all source signal lines; Simultaneously signal G1, G2 link to each other with arbitrary source signal line of several field effect transistor of control gate short respectively, when signal G1 or G2 arrival just make the field effect transistor of all TFT pixel cells of liquid crystal matrix all distinguish conducting; Data voltage signal S1, S2, S3 link to each other with any one source pole of several field effect transistor of controlling the source electrode short circuit respectively at this moment, and data voltage signal S1, S2, S3 just can write liquid crystal capacitance C
LC, and remain on storage capacitors C
LCOn, thereby drive TFT work, sequential and amplitude by control program control test waveform generator, TFT LCD can show that GTGs at different levels, TFT matrix single file, TFT matrix duplicate rows, TFT matrix are single-row, TFT matrix biserial, red, green, blue and other test pictures, the realistic application conditions of imitation LCD finished product, the various defectives that appear the LCD that has defective comprise the bad defective that causes of various deficient manufacturing procedures and raw material.
The voltage signal of seven kinds of variations of electric pilot output energy drive TFT LCD of the present invention, comprise GG, ODD, EVEN, DATA (R), G, voltage signals such as B, produce black, the one-level GTG, the secondary GTG, the ash in class III rank, in vain, red, green, ten pictures such as indigo plant, can detect the blank screen of TFT LCD, defective such as bright spot and bright line, the present invention compared with prior art, have following beneficial effect: (1) can detect the various performance deficiencies of TFT LCD, comprise the bad most of defective that causes of deficient manufacturing procedure and constituent material, enter LCD module operation again by the TFT LCD that detects, improve the yield rate of LCM, reduce consumables cost, enhance productivity; (2) the present invention realizes that simply, reliability is very high, can reduce the cost of LCD detection in the past, changes the too high situation of cost that in the past detected; (3) the present invention not only can be used for concrete TFTLCD detection, and its principle can also apply to the circuit design of STN/TN type liquid crystal, improves the processing procedure of STN/TN in the past; (4) the TFT LCD industry output value is huge, and the future development space is very big, and its economic benefit and social benefit are bigger; (5) the present invention can be applicable to the TFT LCD of different size different manufacturers under the immovable substantially condition of hardware circuit, reduces the equipment cost of enterprise.Cost of the present invention is low, show to fall into the rate height, and detection speed is fast, improves the yield rate of LCM, reduces enterprise cost.The present invention is that a kind of design is ingenious, function admirable, convenient and practical TFT LCD programmable combination property electric logging device.
Description of drawings
Fig. 1 is the TFT equivalent circuit diagram of single pixel unit;
Fig. 2 is the second order drive principle synoptic diagram of TFT LCD;
Fig. 3 is the theory diagram of TFT LCD test circuit of the present invention;
Fig. 4 is the schematic diagram of TFT LCD test circuit of the present invention.
Fig. 5 is the principle schematic of TFT LCD combination property electric measuring method of the present invention.
Embodiment
Embodiment:
Theory diagram of the present invention as shown in Figure 3, include control module 1, D/A modular converter 2, photoelectric coupling switch module 3, power module 4, keyboard 5, wherein control module 1 is connected with D/A modular converter 2 and photoelectric coupling switch module 3, keyboard 5 respectively, and power module 4 supplies power to control module 1, D/A modular converter 2, photoelectric coupling switch module 3, power module 4, keyboard 5 respectively.
Above-mentioned control module 1 is single-chip microcomputer U6.
Above-mentioned single-chip microcomputer U6 is single-chip microcomputer Winbond W78E516BP.
Above-mentioned photoelectric coupling switch module 3 comprises photoelectrical coupler U7 and U8.
Above-mentioned photoelectrical coupler U7 and U8 can detect the TLP521-2 of the broken string problem of TFT LCD for realizing exporting EVEN or ODD signal separately, making TFT LCD show single-double-row.
Above-mentioned D/A modular converter 2 is integrated package U9.
Above-mentioned integrated package U9 is D/A converter TLC7225 able to programme.
Above-mentioned power module 4 comprises integrated regulated power supply U1, U2, U3, U4, U5, transistor T 1, T2, and the output end voltage signal GG of T1 collector equals input DC power voltage, by transistor T 1 its break-make of control, as test gating function; V
ComSignal connects common port, by the directly output of power module part; Output terminal EVEN, ODD voltage signal are exactly the voltage signal of control grid.
Above-mentioned integrated regulated power supply U1 is that integrated regulated power supply W7818, integrated regulated power supply U2 are that integrated regulated power supply W7815, integrated regulated power supply U3 are that integrated regulated power supply W7805, integrated regulated power supply U4 are that integrated regulated power supply 78L05, integrated regulated power supply U5 are integrated regulated power supply 78L05.
The above-mentioned keyboard 5 that is connected with control module 1 include by the automatic/hand function button of control module 1 control and before turn over, after turn over some load button KEY1, KEY2, KEY3, the KEY4 of function.
The detection method of TFT LCD programmable combination property electric logging device of the present invention, it realizes that principle is the drive principle of simulation LCD, utilize several field effect transistor the signal line of all liquid crystal matrixes and the short circuit respectively of source signal line, as long as pressurize for a signal line and one source pole signal wire respectively, all signal lines and source signal line are all pressurizeed respectively, realize promptly that also the LCD frame drives.
The specific implementation method of the detection method of TFT LCD programmable combination property electric logging device of the present invention is to utilize the waveform generator that can export a plurality of clock signals, overall characteristic according to different model LCD, the total enable signal EN of liquid crystal field effect transistor that output frequency is different with amplitude, signal G1, signal G2, VCOM, source signal S1, source signal S2, source signal S3 and other test signal, the EN signal links to each other with the grid of several field effect transistor of all signal line short circuits of control liquid crystal matrix, simultaneously again with all source signal lines of control liquid crystal matrix respectively the grid of several field effect transistor of short circuits link to each other, make these field effect transistor conductings during EN signal noble potential, all signal line short circuits of liquid crystal matrix, the also all short circuits of all source signal lines; Simultaneously signal G1, G2 link to each other with arbitrary source signal line of several field effect transistor of control gate short respectively, when signal G1 or G2 arrival just make the field effect transistor of all TFT pixel cells of liquid crystal matrix all distinguish conducting; Data voltage signal S1, S2, S3 link to each other with any one source pole of several field effect transistor of controlling the source electrode short circuit respectively at this moment, and data voltage signal S1, S2, S3 just can write liquid crystal capacitance C
LC, and remain on storage capacitors C
LCOn, thereby drive TFT work, sequential and amplitude by control program control test waveform generator, TFT LCD can show that GTGs at different levels, TFT matrix single file, TFT matrix duplicate rows, TFT matrix are single-row, TFT matrix biserial, red, green, blue and other test pictures, the realistic application conditions of imitation LCD finished product, the various defectives that appear the LCD that has defective comprise the bad defective that causes of various deficient manufacturing procedures and raw material.
When pressing start button KEY1, the P1.7 port of microprocessor U6 is exported high level, transistor T 1, T2 conducting, and the voltage of T1 collector output+30V makes TFT in running order as the gating signal EN of TFT.The P2.4 of microprocessor U6, P2.5 and P2.6, P2.7 output port are controlled photoelectrical coupler U7 and U8 respectively, make U7 and U8 output high level be+18V, and low level is-the strange grid of TFT of 5V, even grid drive signal G1 and G2.Simultaneously, microprocessor U6 is by port P0.0～P0.7 and P2.0～P2.3 control D/A converter U9, make common port control signal VCOM (fixing) and the total enable signal EN of liquid crystal field effect transistor of U9 output TFT, signal G1, G2, source signal S1, S2, test signals such as S3, gating field effect transistor during the EN high voltage wherein, thereby make the short circuit respectively of all source signal lines and signal line, pass through signal G1 and the G2 grid of the strange/idol row field effect transistor of gating liquid crystal matrix respectively more respectively, while source signal S1, S2, S3 is applied to the N of liquid crystal matrix more respectively, N+1, the source electrode of N+2 (N is a natural number) row, thereby the frame of realizing the monoblock liquid crystal drives, timing variations by test waveform, can simulate the practical application picture of LCD module, as GTGs at different levels, liquid crystal matrix is very capable, liquid crystal matrix idol row, liquid crystal matrix very is listed as, liquid crystal matrix idol row, red, green, pictures such as indigo plant, thereby the picture by the simulation practical application shows the various defectives that LCD shields, and comprises the bad many defectives that cause of bad and starting material of processing procedure.
The present invention is based on the characteristics of the drive voltage signal that can change of single-chip microcomputer, can be as long as update routine can reach the TFT LCD requirement of test different size different manufacturers under the constant condition of hardware circuit, utilize this instrument that TFT LCD is tested, can occur successively deceiving, ten different pictures such as one-level GTG, secondary GTG, ash in class III rank, white, single file, duplicate rows, red, green, blue, can point not worked and have the TFT LCD of defectives such as bright spot bright line or Show Color be incorrect to pick out.
The present invention manufactures corresponding test probe according to the TFT LCD of different manufacturers different size, and adds suitable backlight and polaroid, and connecting power supply can test TFT LCD.
Claims (10)
1, a kind of TFT LCD programmable combination property electric logging device, it is characterized in that including control module (1), D/A modular converter (2), photoelectric coupling switch module (3), power module (4), keyboard (5), wherein control module (1) is connected with D/A modular converter (2) and photoelectric coupling switch module (3), keyboard (5) respectively, and power module (4) supplies power to control module (1), D/A modular converter (2), photoelectric coupling switch module (3), power module (4), keyboard (5) respectively.
2, TFT LCD programmable combination property electric logging device according to claim 1 is characterized in that above-mentioned control module (1) is single-chip microcomputer U6.
3, TFT LCD programmable combination property electric logging device according to claim 2 is characterized in that above-mentioned single-chip microcomputer U6 is single-chip microcomputer Winbond W78E516BP.
4, TFT LCD programmable combination property electric logging device according to claim 3 is characterized in that above-mentioned photoelectric coupling switch module (3) comprises photoelectrical coupler U7 and U8.
5, TFT LCD programmable combination property electric logging device according to claim 4, it is characterized in that above-mentioned photoelectrical coupler U7 and U8 for realizing exporting EVEN or ODD signal separately, making TFT LCD show single-double-row, can detect the TLP521-2 of the broken string problem of TFT LCD.
6, TFT LCD programmable combination property electric logging device according to claim 5 is characterized in that above-mentioned D/A modular converter (2) is integrated package U9, and integrated package U9 is D/A converter TLC7225 able to programme.
7, TFT LCD programmable combination property electric logging device according to claim 6, it is characterized in that above-mentioned power module (4) comprises integrated regulated power supply U1, U2, U3, U4, U5, transistor T 1, T2, the output end voltage signal GG of T1 collector equals input DC power voltage, by transistor T 1 its break-make of control, as test gating function; V
ComSignal connects common port, by the directly output of power module part; Output terminal EVEN, ODD voltage signal are exactly the voltage signal of control grid.
8, TFT LCD programmable combination property electric logging device according to claim 7 is characterized in that above-mentioned integrated regulated power supply U1 is that integrated regulated power supply W7818, integrated regulated power supply U2 are that integrated regulated power supply W7815, integrated regulated power supply U3 are that integrated regulated power supply W7805, integrated regulated power supply U4 are that integrated regulated power supply 78L05, integrated regulated power supply U5 are integrated regulated power supply 78L05; The above-mentioned keyboard (5) that is connected with control module (1) include by the automatic/hand function button of control module (1) control and before turn over, after turn over some load buttons (KEY1, KEY2, KEY3, KEY4) of function.
9, a kind of detection method according to the described TFT LCD of claim 1 programmable combination property electric logging device, it is characterized in that its realization principle is the drive principle of simulation LCD, utilize several field effect transistor the signal line of all liquid crystal matrixes and the short circuit respectively of source signal line, as long as pressurize for a signal line and one source pole signal wire respectively, all signal lines and source signal line are all pressurizeed respectively, realize promptly that also the LCD frame drives.
10, detection method according to the described TFT LCD of claim 9 programmable combination property electric logging device, it is characterized in that the specific implementation method is to utilize the waveform generator that can export a plurality of clock signals, overall characteristic according to different model LCD, the total enable signal EN of liquid crystal field effect transistor that output frequency is different with amplitude, signal G1, signal G2, VCOM, source signal S1, source signal S2, source signal S3 and other test signal, the EN signal links to each other with the grid of several field effect transistor of all signal line short circuits of control liquid crystal matrix, simultaneously again with all source signal lines of control liquid crystal matrix respectively the grid of several field effect transistor of short circuits link to each other, make these field effect transistor conductings during EN signal noble potential, all signal line short circuits of liquid crystal matrix, the also all short circuits of all source signal lines; Simultaneously signal G1, G2 link to each other with arbitrary source signal line of several field effect transistor of control gate short respectively, when signal G1 or G2 arrival just make the field effect transistor of all TFT pixel cells of liquid crystal matrix all distinguish conducting; Data voltage signal S1, S2, S3 link to each other with any one source pole of several field effect transistor of controlling the source electrode short circuit respectively at this moment, and data voltage signal S1, S2, S3 just can write liquid crystal capacitance C
LC, and remain on storage capacitors C
LCOn, thereby drive TFT work, sequential and amplitude by control program control test waveform generator, TFT LCD can show that GTGs at different levels, TFT matrix single file, TFT matrix duplicate rows, TFT matrix are single-row, TFT matrix biserial, red, green, blue and other test pictures, the realistic application conditions of imitation LCD finished product, the various defectives that appear the LCD that has defective comprise the bad defective that causes of various deficient manufacturing procedures and raw material.
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