WO2004086070A1 - 半導体装置の検査回路、および検査方法 - Google Patents
半導体装置の検査回路、および検査方法 Download PDFInfo
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- WO2004086070A1 WO2004086070A1 PCT/JP2004/003549 JP2004003549W WO2004086070A1 WO 2004086070 A1 WO2004086070 A1 WO 2004086070A1 JP 2004003549 W JP2004003549 W JP 2004003549W WO 2004086070 A1 WO2004086070 A1 WO 2004086070A1
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2851—Testing of integrated circuits [IC]
- G01R31/2853—Electrical testing of internal connections or -isolation, e.g. latch-up or chip-to-lead connections
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/12—Test circuits or failure detection circuits included in a display system, as permanent part thereof
Definitions
- the present invention relates to an inspection circuit provided in a display device having a pixel region in which pixels are arranged in a matrix, and an inspection method of the display device. Further, the present invention relates to an inspection circuit and an inspection method for a semiconductor device having a pixel region in which pixels are arranged in a matrix.
- LCD liquid crystal display
- EL electroluminescence
- a device breaks down due to patterning failure, electrostatic breakdown (ESD), etc., the normal operation of the display device itself cannot be expected and must be excluded by quality inspection.
- quality inspection of a display device is performed as shown in Fig. 12A by using a source driver 1203, a gate driver 1204, a pixel area 1205, a signal input terminal 1206, etc.
- the TFT substrate 122 on which the is formed and the opposite substrate 122 are bonded to each other, and the module 1200 as a finished product is formed, as shown in FIG. This is performed by inputting a signal using 1 2 1 1 etc., displaying an image or video (test pattern 1 2 1 2 etc.), and observing the presence or absence of display defects by visual inspection of the screen.
- the inspection is performed at the stage when the display device itself is almost completed as a module 1200, so that the cost spent on the module determined to be defective is eliminated.
- the storage is large. That is, the defect due to the circuit failure is caused only by the TFT substrate 1221, and the process involved in bonding the counter substrate 122 and the like is wasted.
- FIG. 11 shows an example of a configuration that realizes such an inspection.
- shift register (SR) and NAND circuit 19 data latch 20, D_ / A converter (DAC) 21 1, video data line 23, input terminal 22 for signal, power supply, etc.
- An inspection circuit of 8 mag is formed.
- the display device shown in FIG. 11 controls the pixels connected to the corresponding row by each gate signal line 6, and the video signal is input to the digital source driver 18, output to the source signal line 9, and Written to the pixel.
- the video signal is written to the pixel via each pixel TFT 1, whereby the charges held in the storage capacitor 2 are sequentially taken out to the inspection terminal 28 via the inspection line 27, and This is to judge the quality of writing to the memory.
- the analog switch 25 is controlled by a switch drive circuit 30 (see Patent Document 1).
- There is also a method of arranging a test pad on each of the source signal lines 9 and testing the output by applying a probe to each pad see Patent Document 2.
- Patent Document 1 JP 2002-6423 A
- the present invention has been made in view of the above problems, and provides an inspection circuit and an inspection method capable of determining a circuit operation, the presence or absence of a line defect, and the like by an extremely simple method and using a small-scale inspection circuit. is there.
- the following measures have been taken in the present invention.
- the method of inspecting the signals output to the signal lines of which the number has increased with the increase in the definition by using a probe is not practical in view of the inspection throughput and the like as described above. Therefore, in the present invention, the outputs of all the signal lines are input to the inspection circuit, and a specific pattern obtained for all the inputs is obtained as a determination result. Then, a pattern of the test output when all are normal is prepared in advance as a reference pattern, and is compared with the obtained judgment result.
- pass / fail is determined by measuring one or several outputs and comparing them with the output form that should be obtained under normal conditions. As a result, it is not necessary to check every pulse output, and it is possible to quickly determine the presence or absence of a defective portion.
- the present invention it is possible to judge the quality of the TFT substrate without performing an inspection by visually checking the actual test pattern display. Make it possible.
- a digital signal is used as a video signal, and it is possible to determine whether circuit operation is good or not in various types of display devices such as a CD, EL display, and plasma display.
- a circuit for driving the inspection circuit itself is not required, and the inspection can be performed by an extremely simple procedure in which the driver is operated in the same procedure as in the normal display.
- FIG. 1A and 1B are diagrams showing an embodiment of the present invention.
- FIG. 2 is a diagram showing a timing chart of the source driver and the inspection circuit.
- 3A and 3B are diagrams showing the test circuit operation and test output during normal operation.
- 4A and 4B are diagrams showing a test circuit operation and a test output in the malfunction mode A.
- FIG. 5A and 5B show the test circuit operation and test output in malfunction mode B.
- 6A and 6B are diagrams showing the test circuit operation and the test output in the operation failure mode C.
- FIG. 7A and 7B are diagrams showing a test circuit operation and a test output in the malfunction mode D.
- FIG. 7A and 7B are diagrams showing a test circuit operation and a test output in the malfunction mode D.
- FIG. 8A and 8B are diagrams showing a test circuit operation and a test output in the malfunction mode E.
- FIG. 8A and 8B are diagrams showing a test circuit operation and a test output in the malfunction mode E.
- FIG. 9A and 9B are diagrams showing a test circuit operation and a test output in the malfunction mode F.
- FIG. 9A and 9B are diagrams showing a test circuit operation and a test output in the malfunction mode F.
- FIGS 10A and 10B are diagrams showing another embodiment of the present invention.
- FIG. 11 is a diagram showing a configuration of a display device having a conventional inspection circuit.
- FIGS. 12A and 12B are diagrams showing the form of the module and an outline of quality inspection using a probe.
- FIG. 13 is a diagram showing an embodiment of the present invention.
- FIG. 14 is a diagram showing an embodiment of the present invention.
- FIG. 15 is a diagram showing a timing chart of the gate driver and the inspection circuit.
- FIG. 16 is a diagram showing a timing chart of the gate driver and the inspection circuit.
- FIG. 17 is a diagram illustrating an example of division of the inspection circuit. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1A shows an embodiment of the present invention.
- a source driver 101 On the substrate, a source driver 101, a gate driver 102, a pixel area 106, a test circuit 108, and a test output terminal 107 are formed.
- a pixel region 106 In the pixel region 106, a plurality of pixels 105 are arranged in a matrix. Each pixel is controlled by a source signal line 103 and a gate signal line 104.
- the source driver 01 has a shift register and NAND 151, a data latch 152, a level shifter and a buffer 153, and the gate driver 102 has a shift register and NAND 154, a level shifter and a buffer 155.
- Figure 1B shows the configuration of the test circuit.
- the inspection circuit 108 is composed of a plurality of NANDs 1 1 2 and a plurality of inverters 1 1 4 connected alternately in series, and a circuit connected to each of the source signal lines 103 and a plurality of NORs 1 1 3
- a plurality of inverters 115 are alternately connected in series, and a circuit connected to each of the source signal lines 103 is provided in parallel. is retrieved to b.
- a power supply (VDD) is connected to the first input terminal of the NAND of the first stage, and a source signal line (S 1) is connected to the second input terminal.
- the output terminal is connected to the input terminal of the first stage inverter.
- the output terminal of the first stage inverter is connected to the first input terminal of the second stage NAND. From the second stage onwards, at a certain m (2 ⁇ m ⁇ n) stage, the m-th stage inverter output terminal is connected to the first input terminal of the m-th stage NAND, and the second input terminal
- the source terminal is connected to the source signal line (Sm), and the output terminal is connected to the input terminal of the mth stage inverter. Have been.
- the output terminal of the m-th stage inverter is connected to the first input terminal of the m + 1-th stage NAND.
- the final stage that is, the n-th stage inverse output is taken out to the inspection output terminal 107a.
- the power supply (VSS) is connected to the first input terminal of the NOR 1 13 of the first stage, the source signal line (S 1) is connected to the second input terminal, and the output terminal is , Connected to the input terminal of the first stage inverter.
- the output terminal of the first stage inverter is connected to the first input terminal of the second stage NOR.
- the m-th stage NOR output terminal is connected to the first input terminal of the m-th stage NOR
- the source signal is connected to the second input terminal
- the line (Sm) is connected, and the output terminal is connected to the input terminal of the m-th stage inverter.
- the output terminal of the m-th stage inverter is connected to the first input terminal of the m + 1-th stage NOR.
- the final stage, ie, the n-th stage is output to the inspection output terminal 107 b.
- the source driver 101 is operated.
- the operation method may be the same as in the case of performing normal video display. However, at the time of inspection, a state where all source signal lines are set to H level output and a state where all source signal lines are set to L level output are sequentially input as video signals.
- FIG. 2 shows a simple timing chart of the source driver 101, and its operation will be sequentially described below.
- Figure 2 shows clock signals (S CK), start pulses (SSP), latch pulses (SLAT), digital video signals (Data) as input signals, and first to fourth stages as output signals.
- the first line period (Peri 0 d 1) will be described.
- Clock signal and The shift register operates according to the start pulse 201, and the sampling pulse
- Each of the sampling pulses 205 samples a digital video signal and holds data in a latch circuit.
- all the digital video signals 207 are at H level.
- the latch pulse 203 When the latch pulse 203 is inputted after the sampling of the digital video signal in the final stage is completed, the data held in the latch circuit is output to the source signal line all at once. The source signal line output at this time is also held by the latch circuit until the next latch pulse 204 is input.
- the output of the source signal line becomes H level in all stages (210).
- the process moves to the second line period (Period2).
- sampling pulses 206 are sequentially output according to the clock signal and the start pulse 202, and the digital video signal is sampled.
- all of the digital video signals 208 are at L level.
- the latch pulse 204 when the latch pulse 204 is input, the data held in the latch circuit is simultaneously output to the source signal line. At this time, the output of the source signal line is at the L level in all stages (2 1 1).
- the inspection circuit is in a state as shown in FIG. 3A.
- Power supply (VDD) is input to the first input terminal of the NAND 301, and H level is input to the second input terminal. Therefore, the output of NAND 301 becomes L level. Furthermore, this output is inverted via the inverter and input to the next stage NAND. Thereafter, this is repeated, and finally, the H level is output to the inspection output terminal 107a.
- the power supply (VSS) is input to the first input terminal of the NOR 302, and the H level is input to the second input terminal. Therefore, the output of NOR 302 is at the L level. Further, this output is inverted through the inverter and input to the next-stage NOR. Thereafter, this is repeated, and finally, the H level is output to the inspection output terminal 107b.
- the inspection circuit is in a state as shown in FIG. 3B.
- NAND and NOR connected to all the source signal lines operate, and in this case, the level is output to the inspection output terminals 107a and 107b.
- the state of the test output terminals that is, when the source signal line output is at H level over all stages, the H level is output at all test output terminals, and when the source signal line is at L level over all stages.
- the state where the L level is output to the test output terminals is a normal test output. In other words, this indicates that the H-level video signal and the L-level video signal are normally captured in all stages, and the source signal line is being charged and discharged.
- the output waveforms of the test output terminals 10, 7 a and 107 b are shown in the lower part of the timing chart of FIG. 2 at 107 a and 107 b.
- E When the output of the source signal line (S2) is fixed at H level and the output of the source signal line (Sn) is fixed at L level.
- F When the output of the source signal line (S2) is fixed at L level and the output of the source signal line (Sn) is inverted from normal.
- These operational failures can be caused by, for example, a short circuit between a source signal line and a power supply line due to patterning failure, or a circuit operation failure due to device breakdown due to electrostatic breakdown during a process. .
- the operation of the inspection circuit for each of the malfunctions A to F is described below.
- FIG. 4A and 4B show the test circuit operation and the test output in the malfunction mode A.
- the source signal line (S4) is fixed at the H level regardless of the digital video signal. Defective parts are indicated by an “X” mark 400.
- the state in which the H level is output to the source signal line in all stages, that is, in FIG. 4A, the logic is the same as that of the normal operation, so the inspection output terminals 107a and 107b are In both cases, the H level is output, and normal judgment is made.
- the source signal lines are output at the L level over all stages, as shown in FIG.
- 6A and 6B show the test circuit operation and the test output in the malfunction mode C.
- the source signal line (S4) is , The output is inverted.
- Defective parts are indicated by an “X” mark 600.
- the logic is inverted in NAND 601 and NOR 602, respectively, regardless of whether the ⁇ level is output to the source signal line over all stages or the L level is output.
- An L level is output at 07a, and in the latter case, an H level is output at the inspection output terminal 107b, so that a failure judgment can be obtained.
- the examples so far have described the case where there is one defective portion for all the source signal lines.
- the operation failure modes D to F are examples in which a plurality of failure points exist.
- FIG. 7A and 7B show the test circuit operation and the test output in the malfunction mode D.
- the H level is fixed at two locations on the source signal lines (S2, S4) regardless of the digital video signal.
- Defective parts are indicated by “X” 700 and 710.
- the logic is the same as that of the normal operation, so that the normal judgment is made.
- FIG. 7A shows that the logic is the same as that of the normal operation, so that the normal judgment is made.
- the logic when there are a plurality of defective portions, the logic is inverted at the first defective portion, that is, NOR 701 connected to the resource signal line (S2), and then, Since the logical inversion state is preserved without change in the appearing defective part, that is, in the NOR 702 connected to the resource signal line (S4), the H level is output to the inspection output terminal 107b, and the defective state is output. Judgment is obtained.
- FIGS 8A and 8B show the test circuit operation and the test output in the malfunction mode E.
- the source signal line (S2) is fixed at the H level regardless of the digital video signal
- the source signal line (Sn) is fixed at the L level regardless of the digital video signal.
- Defective points are indicated by “” and “800”.
- the former is defective.
- the logic is inverted in NOR 802, and the H level is output to the test output terminal 107b.
- the logic is inverted in the NAND 801 and the L level is output to the test output terminal 107a. The output is output, and a defect judgment is obtained. In this way, even when failures in different modes occur at a plurality of locations, accurate determinations can be made without obstructing each other's inspection output.
- FIGS. 9A and 9B show the test circuit operation and the test output in the malfunction mode F.
- the L level is fixed at the source signal line (S 2) regardless of the digital video signal, and the output is inverted with respect to the digital video signal at the source signal line (S n).
- Defective parts are indicated by “X” marks 900 and 910.
- the logic is inverted in the NAND 901 and an L level is output to the inspection output terminal 107a.
- N 0 The logic is inverted at R902, and the H level is output to the inspection output terminal 107b, and a failure judgment is obtained.
- the determination is accurately performed without the defect of the source signal line (Sn) affecting the logical inversion appearing in the NAND 901.
- the inspection circuit of the present invention is capable of performing extremely accurate failure determination for various failure modes, and is provided with a driver that inputs a digital video signal and outputs a digital signal to a source signal line.
- a driver that inputs a digital video signal and outputs a digital signal to a source signal line.
- the display device it is possible to determine whether circuit operation is good or not in various types of display devices such as an LCD, an EL display, and a plasma display.
- the output (signal) of the inspection output terminal is Regardless of the L level, the case where the same output is obtained is normal, and if any failure judgment appears, the outputs of the two test output terminals are different. Therefore, by providing a comparison circuit that determines the equivalence of the outputs of the two test output terminals, it is easier to obtain the test output.
- Ex NOR Ex c I usive-NOR R
- Pass / fail judgment may be made based on whether the output of the output terminal 107 is at the H level or the L level. According to the configuration shown in Fig. 1 OA, if the ExNOR output is at H level, it is judged as good, and if it is at L level, it is judged as defective.
- Fig. 1A when the video signal (Data) input format is analog, a digital signal similar to the maximum amplitude of the actual video signal is tested only during testing.
- the present invention is characterized in that, by inputting the output signals of many signal lines to the inspection circuit at a time, the inspection is completed with one or two patterns of judgment waveforms without observing the waveform over time. I have.
- the configuration of the inspection circuit is not limited to FIGS. 1B and 10 but includes a configuration that can provide an equivalent function even with a different circuit configuration.
- the inspection circuit and the inspection method of the present invention can be easily applied to an operation inspection of a gate driver.
- an example will be described in which the five test circuits described in the first embodiment are used for an operation test of a gate driver.
- Figures 13 and 13 show examples of the configuration.
- a source driver 1301, a gate driver 1302, a pixel area 1306, an inspection circuit 1310, and an output terminal 1313 are formed on the substrate.
- the pixel area 1306 includes a plurality of pixels 1305 arranged in a matrix. Each pixel is controlled by a source signal line 1303 and a gate signal line 1304.
- the source driver 1301 sequentially outputs sampling pulses in the shift register and the NAND circuit 1351 in response to the input of the clock signal (SCK) and the start pulse (SSP). Then, the video signal (Data) is sampled in the data latch 1352, subjected to amplitude conversion or amplification in the level shifter and buffer 1353, and sequentially output to the source signal line.
- the gate driver 1302 sequentially outputs a row selection pulse in the shift register and the NAND circuit 1354 in response to the input of the clock signal (GCK) and the start pulse (GSP). Thereafter, the level shifter and the buffer 1355 undergo amplitude conversion or amplification, and sequentially select gate signal lines (G1 to Gm) of each row.
- GCK clock signal
- GSP start pulse
- the configuration of the inspection circuit 1310 is shown in FIG. Here, an inspection circuit 13 ⁇ 0 provided for inspection of the gate driver 1302 will be described.
- the inspection circuit 1310 includes a latch circuit 1311 comprising a first latch circuit 1401 and a second latch circuit 1402, and a judgment circuit 1312.
- the judgment circuit 1312 has the same configuration as the inspection circuit of the source driver.
- a plurality of NANDs 112 and a plurality of inverters 114 are alternately connected in series, and a gate signal line (G1 Gm), multiple NORs 113 and multiple inverters 114 were connected alternately in series, and further connected to each of the gate signal lines (G1 to Gm).
- a circuit and a circuit are provided in parallel, and outputs of both final stages are taken out to test output terminals 107a and 107b.
- the gate driver 1302 is operated.
- the operation method may be the same as in the case of performing normal video display.
- FIG. 15 shows a simple timing chart of the gate driver 1302 and the inspection circuit 1310, and the operation thereof will be sequentially described below.
- Figure 15 shows a clock signal (GCK) and start pulse (GSP) as driver-side input signals, test signals (CCK 1 and CCK 2) and test data latch signals as test circuit-side input signals.
- CLAT clock signal
- 1st to 4th rows m-th row selection pulse
- GLine 1 to 4, GL in em m-th row selection pulse
- C1 to Cm check circuit latch output
- the shift register operates according to a clock signal (GCK) and a start pulse (GSP) 1501, and sequentially outputs a row selection pulse 1502.
- the row selection pulse 1 502 then undergoes amplitude conversion or amplification, respectively, to select the gate signal line of each row.
- the row selection pulse 1502 sequentially output is input to the first latch circuit 1401 in the inspection circuit, and captures the inspection signal (CCK1, CCK2) 1503 or 1504. In this period (Peri0d1), the H level is taken in all the first latch circuits 1401.
- a row selection pulse 1502 is output from the first row to the last row, and after the first latch circuit 1401 in the test circuit has completed capturing at all stages, the test data latch signal (CLAT) 1505 is output. The data input and held in the first latch circuit 1401 is transferred to the second latch circuit 1402 all at once.
- the process proceeds to the second frame period (Peri 0 d 2). Same as the first frame period Then, according to the clock signal and the start pulse 1511, the row selection pulse 1512 is sequentially output to select the gate signal line of each row.
- the row selection pulse 1512 sequentially output is input to the first latch circuit 1401 in the inspection circuit, and captures the inspection signal (CCK K CCK2) 1503 or 1504.
- the L level is taken in all the first latch circuits 1401.
- the row selection pulse 1 5 1 2 is output from the first row to the last row, and after all stages of the first latch circuit 1 401 in the test circuit have been fetched, the test data latch signal (C LAT) ⁇ 5 15 is input, and the data held in the first latch circuit 1401 is simultaneously transferred to the second latch circuit 1402.
- the validity of the gate signal line selection timing and the like is determined by the same procedure as the source driver inspection described in the first embodiment. Since the operation of the decision circuit 1312 is the same, the description is omitted here.
- test signals CCK1 and CCK2
- a row can be selected in a certain row. Even if the pulse output timing is incorrect, it is possible to judge the defect with the inspection output. In this case, odd-numbered rows of the gate signal lines take in CCK1, and even-numbered rows take in CCK2.
- a failure such as an increase in the pulse width of a row selection pulse to be sequentially output at a certain point may occur.
- an operation trigger may occur at the rising edge or the falling edge of the clock signal.
- the irregular pulse width often spreads for about half a clock cycle. If the timing of the latch operation in the test circuit is determined by the illegal pulse described here, the test signal as shown in Fig. 15 will determine that it is normal, but as shown in Fig. 16, If such a test signal in the form of a clock signal is used, if the first latch circuit 1401 operates at an improper timing, the logic of the data at the time of capture is inverted, so that a failure determination can be made with high accuracy. .
- the inspection circuit of the present invention described in the first and second embodiments is a circuit that is not necessary for the operation of the display device according to actual specifications. Therefore, as shown in FIG. 17A, after forming the first module 1700 in which the inspection circuits 1701 and 1702 are formed on the substrate, the above-described inspection process is performed. However, when finally dividing into a desired size, it is preferable to remove the inspection circuits 1701 and 1702 as shown in FIG. 17B and obtain a module 17 ⁇ 0.
- the present invention can be used not only for the display device but also for output determination of an address decoder used for a memory or the like, and can be widely applied to inspection of a semiconductor device having a large number of signal output pins.
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US7205986B2 (en) | 2002-12-18 | 2007-04-17 | Semiconductor Energy Laboratory Co., Ltd. | Image display device and testing method of the same |
US7518602B2 (en) | 2004-12-06 | 2009-04-14 | Semiconductor Energy Laboratory Co., Ltd. | Test circuit and display device having the same |
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US7342579B2 (en) * | 2004-10-11 | 2008-03-11 | Chunghwa Picture Tubes, Ltd. | Thin film transistor array plate, liquid crystal display panel and method of preventing electrostatic discharge |
JP2006309110A (ja) * | 2005-03-31 | 2006-11-09 | Toshiba Matsushita Display Technology Co Ltd | 表示装置、アレイ基板、及び表示装置の製造方法 |
JP4600147B2 (ja) * | 2005-05-20 | 2010-12-15 | エプソンイメージングデバイス株式会社 | 検査回路、電気光学装置および電子機器 |
TW200719310A (en) * | 2005-08-05 | 2007-05-16 | Sony Corp | Display device |
EP1818860B1 (en) | 2006-02-08 | 2011-03-30 | Semiconductor Energy Laboratory Co., Ltd. | RFID device |
DE102017201101A1 (de) * | 2017-01-24 | 2018-07-26 | Zf Friedrichshafen Ag | Verfahren und Vorrichtung zum Betreiben eines Displays |
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2004
- 2004-03-17 JP JP2004564055A patent/JP4624109B2/ja not_active Expired - Fee Related
- 2004-03-17 WO PCT/JP2004/003549 patent/WO2004086070A1/ja active Application Filing
- 2004-03-24 US US10/807,692 patent/US7187204B2/en not_active Expired - Fee Related
- 2004-03-25 TW TW093108156A patent/TWI390271B/zh not_active IP Right Cessation
-
2007
- 2007-03-01 US US11/712,886 patent/US7554359B2/en not_active Expired - Fee Related
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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US7205986B2 (en) | 2002-12-18 | 2007-04-17 | Semiconductor Energy Laboratory Co., Ltd. | Image display device and testing method of the same |
US7528817B2 (en) | 2002-12-18 | 2009-05-05 | Semiconductor Energy Laboratory Co., Ltd. | Image display device and testing method of the same |
US7834838B2 (en) | 2002-12-18 | 2010-11-16 | Semiconductor Energy Laboratory Co., Ltd. | Image display device and testing method of the same |
US8203519B2 (en) | 2002-12-18 | 2012-06-19 | Semiconductor Energy Laboratory Co., Ltd. | Image display device and testing method of the same |
JP2006189809A (ja) * | 2004-12-06 | 2006-07-20 | Semiconductor Energy Lab Co Ltd | 検査回路及び検査回路を有する表示装置 |
US7518602B2 (en) | 2004-12-06 | 2009-04-14 | Semiconductor Energy Laboratory Co., Ltd. | Test circuit and display device having the same |
Also Published As
Publication number | Publication date |
---|---|
US7554359B2 (en) | 2009-06-30 |
US7187204B2 (en) | 2007-03-06 |
JP4624109B2 (ja) | 2011-02-02 |
TW200420959A (en) | 2004-10-16 |
TWI390271B (zh) | 2013-03-21 |
US20050035805A1 (en) | 2005-02-17 |
JPWO2004086070A1 (ja) | 2006-06-29 |
US20070159211A1 (en) | 2007-07-12 |
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