JP2009014883A - Liquid crystal display device and inspection method of inspecting the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device capable of easily specifying a defective part without laser irradiation. <P>SOLUTION: The liquid crystal display device 30 has a plurality of scanning lines 10 arranged in parallel on a substrate and a plurality of signal lines 11 arranged so as to orthogonally cross the scanning lines 10. Further, the liquid crystal display device 30 includes: a plurality of inspecting scanning line input terminals 1, 2 which collect the scanning lines 10 every first prescribed pitch; a plurality of inspecting signal lines input terminals 3, 4, 5 which collect the signal lines 11 every second prescribed pitch; an address specifying scanning line input terminal 15 which collects the scanning lines 10 every third prescribed pitch of which the interval is wider than that of the first prescribed pitch; and an address specifying scanning line input terminal 16 which collects the scanning lines 11 every fourth prescribed pitch of which the interval is wider than that of the second prescribed pitch. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an active matrix liquid crystal display device and an inspection method for inspecting the liquid crystal display device.

  In general, in an active matrix liquid crystal display device, individual independent pixel portions are arranged in a matrix on an array substrate of a liquid crystal panel, and pixel electrodes and switching elements are provided in these pixel portions, respectively. The array substrate is disposed to face the counter substrate via the liquid crystal layer, and the pixel electrode is disposed to face the counter electrode on the counter substrate via the liquid crystal layer. In this active matrix type liquid crystal display device, a driving voltage is applied to a pixel electrode via a switching element, and a liquid crystal is generated by a potential difference between the pixel electrode and a counter electrode arranged to face the pixel electrode via a liquid crystal. The image is displayed on the liquid crystal panel by driving and optically modulating the projection light or the reflected light.

  When the switching element is a thin film transistor (hereinafter referred to as TFT), a plurality of scanning lines for scanning and a plurality of signal lines for image signals are arranged on the array substrate so as to intersect with each other. Pixels are provided at each intersection. The gate electrode of the TFT is electrically connected to a scanning line for inputting a scanning signal for controlling the switching element, the source electrode is electrically connected to a signal line for inputting a signal of an image to be displayed on the liquid crystal panel, and a drain electrode. Are electrically connected to the pixel electrode.

  A voltage corresponding to the horizontal scanning period is sequentially applied to each scanning line from above. A voltage corresponding to the image signal is applied to each signal line. Accordingly, the TFT is turned on at a timing when a voltage is applied through the scanning line, and a voltage corresponding to the image signal from the signal line is sampled and applied to the pixel electrode. The liquid crystal layer is charged with a difference between the voltage applied to the pixel electrode and the voltage applied to the counter electrode, and the liquid crystal layer is driven to perform a display operation by optical response.

  In general, as one of inspections of the liquid crystal display device, a lighting inspection by pixel display is performed. When performing this lighting inspection, there is a method of displaying the sandwiched pitch panel of the high-definition panel in a cell state by reducing the signal input terminals by bundling the gate wiring and the source wiring. As a result, the cost of the inspection jig can be reduced and the number of signal input terminals can be reduced, so that the pad size of the signal input terminals can be increased, and the display can be easily performed without causing a probing defect.

  As a method of bundling the gate wiring and the source wiring, for example, the gate wiring is bundled into two wirings, an odd wiring in which odd-numbered gate signal input terminals are bundled and an even wiring in which even-numbered gate signal input terminals are bundled. The source wiring is bundled by three wirings: an R wiring bundled with R signal input terminals, a G wiring bundled with G signal input terminals, and a B wiring bundled with B signal input terminals (see Patent Document 1 below).

  Here, since the gate wiring and the source wiring are bundled as described above, solid display is possible but special display cannot be performed. When a point defect or a line defect occurs in such a panel and the defect location is analyzed, it becomes difficult to specify the defect location. Therefore, as a conventional method for identifying a defective portion, the lighting display state is confirmed, and the defective portion is marked with a pen. After marking with the pen, bring the panel to the laser device and irradiate the area marked with the pen with laser. Again, the number of pixels from the marking portion to the defective portion is measured with a magnifying glass or the like while the display is turned on to identify the defective portion.

JP 2002-98992 A

  However, the conventional method for identifying a defective portion has a problem that it takes time and labor since laser irradiation is performed and a defective portion is identified by a loupe or the like.

  Accordingly, the present invention has been made to solve such a problem, and an object of the present invention is to obtain a liquid crystal display device that can easily identify a defective portion without laser irradiation.

  The liquid crystal display device according to the present invention is a liquid crystal display device having a plurality of scanning lines arranged in parallel on a substrate and a plurality of signal lines arranged orthogonal to the scanning lines. A plurality of inspection scanning line input terminals that aggregate every first predetermined pitch, a plurality of inspection signal line input terminals that aggregate the signal lines every second predetermined pitch, and the scanning lines that are the first Address specifying scanning line input terminals that aggregate every third predetermined pitch that is wider than the predetermined pitch, and addresses that aggregate the signal lines every fourth predetermined pitch that is wider than the second predetermined pitch. A signal line input terminal for identification.

  According to the liquid crystal display device of the present invention, by providing an address specifying input terminal in which scanning lines and signal lines are aggregated at a predetermined pitch, a lattice pattern is displayed, and the distance from the lattice pattern is confirmed to be a laser. The address of the defective part can be specified without performing marking, and time and labor can be saved compared with the conventional defect part specifying method. In addition, since it becomes possible to identify a defective portion without performing laser marking, it is possible to improve the quality of the panel by repairing the defect.

<Embodiment>
FIG. 1 is a diagram showing a liquid crystal display device 30 according to an embodiment of the present invention. With reference to FIG. 1, the structure of the liquid crystal display device 30 of this invention is demonstrated. In the liquid crystal display device 30, a plurality of scanning lines 10 arranged in parallel on the array substrate 20 and a plurality of signal lines 11 are wired so as to be orthogonal to the scanning lines 10. The liquid crystal display device 30 is provided with an inspection terminal for performing a display inspection. The inspection terminal includes a plurality of inspection scanning line input terminals that aggregate the scanning lines 10 at a predetermined pitch, and a predetermined number of signal lines 11. A plurality of inspection signal line input terminals aggregated for each pitch are provided. That is, in order to easily perform a solid display display inspection, the signal input terminals are reduced by bundling the scanning lines 10 (scanning line input terminals) and the signal lines 11 (signal line input terminals).

  Further, the address specifying scanning line input terminal 15 that aggregates the scanning lines 10 at a predetermined pitch that is wider than the predetermined pitch of the inspection scanning line input terminal, and the signal line 11 from the predetermined pitch of the inspection signal line input terminal. Are also provided with address specifying signal line input terminals 16 that are aggregated at predetermined intervals with a wide interval. That is, by inputting signals to the address specifying scanning line input terminal 15 and the address specifying signal line input terminal 16, a lattice pattern can be displayed on the liquid crystal display device 30.

  Next, a method for integrating the scanning lines 10 and the signal lines 11 will be described. For example, as a method of consolidating the scanning lines 10, there is a method of consolidating the scanning lines 10 in an odd number and an even number. That is, as shown in FIG. 1, odd-numbered scanning scanning line input terminals 1, 1, 3, 5,..., And odd-numbered scanning line input terminals 8, 2, 4, 6,. The even-numbered scanning line input terminal 2 for inspection, which is a collection of even-numbered scanning line input terminals 9, is provided, and the scanning lines 10 are collected. For example, as a method of consolidating the signal lines 11, there is a method of consolidating the signal lines 11 into R signals, G signals, and B signals. That is, as shown in FIG. 1, the R signal inspection signal line input terminal 4 and the G signal input terminal 12 (3N + 1, (N = 0, 1, 2,...)) Are collected. A signal line input terminal 5 for G signal that aggregates signal line input terminals 13 (3N + 2), and a signal line input terminal 6 for B signal that aggregates signal line input terminals 14 (3N + 3) for B signals are provided. Line 11 is aggregated.

  Next, an aggregation method of the address specifying scanning line input terminal 15 and the address specifying signal line input terminal 16 will be described. The address specifying scanning line input terminal 15 aggregates the scanning lines 10 by integrating the odd-numbered scanning line input terminals 8 and the even-numbered scanning line input terminals 9 every predetermined number. For example, as shown in FIG. 1, every ten scanning lines 10 are collected. The address specifying signal line input terminal 16 aggregates the signal lines 11 in a predetermined number of R signal line input terminals 4, G signal line input terminals 5, and B signal line input terminals 6. Aggregate. For example, as shown in FIG. 1, 3M + 1 (M = 3, 6, 9...) Signal line input terminals 4 are collected.

  Reference numerals 3 and 7 are switching input terminals for controlling conduction / cutoff between the aggregated terminals 1, 2, 15, 4, 5, 6, and 16 and the non-aggregated terminals 8, 9, 13, and 14.

  Next, the operation when the display inspection is performed will be described with reference to FIG. First, normal display is performed as follows, and a display inspection is performed to check whether a point defect or a line defect has occurred on the panel. When normal display is performed, inspection signals are input to the inspection scanning line input terminals 1 and 2 and the inspection signal line input terminals 4, 5, and 6. An inspection signal to be input to the inspection scanning line input terminal 2 is input to the address specifying scanning line input terminal 15, and an input to the inspection signal line input terminal 4 is input to the address specifying signal line input terminal 16. The inspection signal to be input is input. By inputting such a signal, the liquid crystal display device 30 can be displayed solid.

  Next, in the above-described display inspection, when there is a display defect, a lattice pattern is displayed on the liquid crystal display device 30 as follows. When displaying the lattice pattern, an address specifying signal is input to the address specifying scanning line input terminal 15 and the address specifying signal line input terminal 16. The address specifying signal input to the address specifying scan line input terminal 15 is a signal having a timing different from that of the test signal input to the test scan line input terminals 1 and 2 described above. Similarly, the address specifying signal input to the address specifying signal line input terminal 16 is input with a signal having a timing different from that of the above-described inspection signals input to the inspection signal line input terminals 4, 5, and 6. The address specifying signal input to the address specifying signal line input terminal 16 is solidly displayed by applying a voltage different from the above-described inspection signal input to the inspection signal line input terminals 4, 5 and 6. Color adjustment different from the time is performed to distinguish the display from the solid display.

  Next, the address of the defective pixel portion can be specified by confirming where the defective pixel portion is in the lattice pattern displayed by the above-described method and confirming the number of pixels from the lattice pattern.

  As described above, a lattice-like pattern can be displayed on the liquid crystal display device 30. By checking the distance between the lattice pattern and the defective portion, the address of the defective portion can be specified without performing marking with a laser beam. Thus, time and labor can be saved compared with the conventional defect location identification method. In addition, since it is possible to identify a defective portion without performing laser marking, it is possible to improve the quality of the panel by repairing the defect.

It is the figure which showed the liquid crystal display device in embodiment of this invention.

Explanation of symbols

  1, 2 Inspection scan line input terminal, 3, 7 Switching input terminal, 4, 5, 6 Inspection signal line input terminal, 8 Odd scan line input terminal, 9 Even scan line input terminal, 10 scan Line, 11 signal line, 12 R signal line input terminal, 13 G signal line input terminal, 14 B signal line input terminal, 15 address specifying scanning line input terminal, 16 address specifying signal line input terminal , 20 array substrate, 30 liquid crystal display device.

Claims (5)

In a liquid crystal display device having a plurality of scanning lines arranged in parallel on a substrate and a plurality of signal lines arranged to be orthogonal to the scanning lines,
A plurality of inspection scanning line input terminals that aggregate the scanning lines at a first predetermined pitch;
A plurality of inspection signal line input terminals that aggregate the signal lines at every second predetermined pitch;
An address specifying scan line input terminal that aggregates the scan lines at every third predetermined pitch that is wider than the first predetermined pitch;
A liquid crystal display device comprising: an address specifying signal line input terminal that aggregates the signal lines at every fourth predetermined pitch that is wider than the second predetermined pitch. The plurality of inspection scanning line input terminals are:
A first inspection scanning line input terminal for collecting the odd-numbered scanning lines;
A second inspection scanning line input terminal that aggregates the even-numbered scanning lines, and
The plurality of inspection signal line input terminals are:
A first inspection signal line input terminal that aggregates the signal lines of the R signal;
A second inspection signal line input terminal that aggregates the signal lines of the G signal;
A third inspection signal line input terminal that aggregates the signal lines of the B signal,
The address specifying scanning line input terminal aggregates the odd numbered scanning lines or the even numbered scanning lines every predetermined number,
2. The liquid crystal display device according to claim 1, wherein the address specifying signal line input terminal aggregates a predetermined number of signal lines of the R signal, signal lines of the G signal, or signal lines of the B signal.   The signal at different timings is input to the inspection scanning line input terminal and the address specifying scanning line input terminal, and to the inspection signal line input terminal and the address specifying signal line input terminal. Liquid crystal display device.   4. The liquid crystal display device according to claim 1, wherein different voltages are applied to the inspection signal line input terminal and the address specifying signal line input terminal. In the test | inspection method which test | inspects the liquid crystal display device in any one of Claim 1 to 4,
A test signal is input to the test scanning line input terminal, the test signal line input terminal, the address specifying scan line input terminal, and the address specifying signal line input terminal to display the liquid crystal display device. And the steps
A second step of inputting an address specifying signal to the address specifying scanning line input terminal and the address specifying signal line input terminal and causing the liquid crystal display device to display a grid pattern;
When there is a defective pixel portion in the first step, a liquid crystal display device capable of specifying the address of the defective pixel portion from the distance from the lattice pattern in the second step is inspected Inspection method.

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