JP3872086B2 - Liquid crystal display - Google Patents

Description

  The present invention relates to a liquid crystal display device, and more particularly to an active matrix liquid crystal display device using active elements such as thin film transistors.

  Liquid crystal display devices are becoming widespread as display terminals for information processing equipment (OA equipment) such as personal computers because of their thinness and light weight and high image quality comparable to that of a cathode ray tube.

  An active matrix type liquid crystal display device is provided with a nonlinear element (active element, switching element) corresponding to each of a plurality of pixel electrodes arranged in a matrix. Since the liquid crystal in each pixel is theoretically driven at all times (duty ratio 1.0), the active matrix method has a better contrast than the so-called simple matrix method, which employs the time-division driving method. It is becoming an indispensable technology for color liquid crystal display devices. A typical active element is a thin film transistor (TFT).

  Note that an active matrix type liquid crystal display device using a thin film transistor is known, for example, in Patent Document 1 and Non-Patent Document 1 below.

  A liquid crystal display device (that is, a liquid crystal display module) is made of, for example, a transparent insulation made of two sheets of glass or the like with a predetermined gap so that surfaces on which a laminated film such as a transparent electrode for display and an alignment film are formed face each other. The substrates are overlapped, and the substrates are bonded together by a seal material provided in a frame shape (b-shaped) at the peripheral edge between the substrates, and between the substrates from the liquid crystal sealing port provided in a part of the seal material A liquid crystal display element with a liquid crystal sealed inside the sealing material and a polarizing plate that transmits only a certain amount of polarized light outside the two substrates (ie, liquid crystal display panel, LCD: Liquid Crystal Display) ) And a backlight that is disposed under the liquid crystal display element and emits surface light to supply light to the liquid crystal display element and display an image, and a drive disposed outside the outer periphery of the liquid crystal display element. Circuit board, a plastic mold case for storing and holding a liquid crystal display element and a backlight, a metal upper shield case for storing each member and having a display window opened, a metal lower shield case, and the like. ing.

  Liquid crystal display devices are produced with advanced manufacturing technology and an environment that eliminates foreign objects as much as possible, but some of the signal lines necessary for normal display are disconnected, and the display screen is always unlit in a linear manner. Alternatively, a display defect called a so-called line defect may occur in which pixels that are always lit are displayed.

  Although this line defect is selected in the product inspection process, the liquid crystal display element in which the line defect has occurred is discarded, resulting in a decrease in manufacturing yield and an increase in manufacturing cost. Therefore, it has been considered to correct this line defect.

  FIG. 12 is a schematic plan view of a liquid crystal display element in a conventional liquid crystal display device and a driving circuit board disposed on the outer periphery thereof.

  LCD is a liquid crystal display element, SCR is an effective display area (effective screen), GD is a scanning signal driver (driving IC), GB is a scanning signal source circuit board, DD is a video signal driver (driving IC), and DB is a video signal. A source circuit board, CONT is a control circuit board, DATA is a video signal line, DAN is a disconnection portion of the video signal line DATA, DH is a disconnection correction wiring, and CN1 and CN2 are disconnection correction connection portions.

  As shown in FIG. 12, in the liquid crystal display element LCD, the video signal line DATA is arranged in the effective display area SCR. Actually, a large number of video signal lines DATA are arranged, but in this figure, only one line in which a disconnection has occurred is shown.

  A video signal necessary for display is supplied from the video signal driver DD to the video signal line DATA. However, when the disconnection occurs in the video signal line DATA at the disconnection point DAN, the video signal is not correctly transmitted from the disconnection point DAN to the lower part of FIG. 12, and the display defect called the line defect described above occurs.

  In this prior art, in order to correct a display defect due to disconnection, a disconnection correction wiring DH is provided in a “U” shape on the liquid crystal display element LSD outside the effective display area SCR. In such a configuration, when a disconnection occurs in the video signal line DATA, the locations of the first disconnection correction connection portion CN1 and the second disconnection correction connection portion CN2 are melted by a laser or the like so that the disconnection location DAN The included video signal line DATA and the disconnection correcting wiring DH are electrically connected to correct the disconnection.

  In this prior art, in order to transmit a video signal from the disconnection point DAN downward in FIG. 12, it is transmitted from the video signal driver DD to the disconnection correction wiring DH via the first disconnection correction connection portion CN1. The video signal is supplied from below in FIG. 12 via the disconnection correcting connection CN2.

JP-A 63-309921 "12.5 inch active matrix color liquid crystal display with redundant configuration", Nikkei Electronics, pp. 193-210, December 15, 1986, published by Nikkei McGraw-Hill

  However, the above prior art has the following problems.

  The disconnection correction wiring DH for transmitting the video signal of the video signal line DATA in which the disconnection has occurred needs to be installed outside the effective display area SCR. Therefore, the distance of the wire for correcting the disconnection correction DH is inevitably increased, so that the parasitic capacitance and resistance of the wire for correcting disconnection DH are increased, and a delay of the video signal occurs. That is, in the disconnected video signal line DATA, the difference due to this signal delay between the video signal supplied from below in FIG. 12 via the disconnection correcting wiring DH and the video signal directly supplied from the video signal driver DD. Will occur. That is, due to the breakage correction, for example, in a display screen with a gray pattern on one side, a slight change in luminance occurs at the breakage point DAN as a boundary. This means that the image quality is deteriorated as compared with the liquid crystal display device without the disconnection portion DAN.

  An object of the present invention is to provide a liquid crystal display device that suppresses a change in luminance of a display screen due to a signal delay after correcting a disconnection of a signal line, and that has a high image quality and a high yield.

In order to solve the above problems, the present invention provides a liquid crystal layer side surface of one liquid crystal display substrate of two liquid crystal display substrates that are disposed to face each other via a liquid crystal layer and constitute a liquid crystal display element. Above, a plurality of scanning signal line groups extending in the x direction and juxtaposed in the y direction, and video signals insulated from the scanning signal line groups and extending in the y direction and juxtaposed in the x direction A display group is formed by a region where the scanning signal line group and the video signal line group intersect, and an active element and a pixel electrode are respectively provided in regions surrounded by the scanning signal line and the video signal line. And a video signal driver connected to the video signal line group is disposed on one side outside the display area, and on the other side outside the display area. , A scanning signal driver connected to the scanning signal line group Wherein the two liquid crystal display substrate is disposed on another substrate, wherein the plurality of video signal driver the scan signal driver video signal driver which is located closest to the arranged side in the signal output pin that is not connected to the video signal line, is connected to a disconnection modified wiring, the disconnection correcting wiring from the surface of the liquid crystal layer side of the liquid crystal display substrate of the one, the scanning signal through the wiring on the board the driver is located, said scanning signal line group, characterized in that it is routed pull opposite sides to the side where the video signal driver without intersection is located .

  The disconnection correcting wiring is connected to a signal line disconnected in the video signal line group, and an address of the disconnected signal line is inputted to a signal control circuit.

  Further, a signal amplifier is connected to the wire for correcting disconnection.

  Further, a signal amplifier is connected to the wire for correcting disconnection, and the video signal driver is a video signal driver at the end closest to the signal amplifier.

  According to the present invention, it is possible to reduce the distance of the disconnection correction wiring by the configuration in which the disconnection correction wiring is connected to the signal output pin not connected to the video signal line of the driving IC located at the screen end. , Signal delay can be reduced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings described below, components having the same function are denoted by the same reference numerals, and repeated description thereof is omitted.

Reference form 1
Figure 1 is a schematic plan view of the deployed driving circuit board to the liquid crystal display device and its peripheral portion according to the first reference of the present invention.
LCD is a liquid crystal display element, SCR is an effective display area (effective screen), GD is a scanning signal driver (driving IC), GB is a scanning signal source circuit board, DD is a video signal driver (driving IC), and DB is a video signal. Source circuit board, CONT is a control circuit board, DATA is a video signal line, DAN is a disconnection point of the video signal line DATA, DH1, DH2, and DHG are disconnection correction wirings, CN1 and CN2 are disconnection correction connection parts, and DA is a signal It is an amplifier (buffer amplifier).

In this reference embodiment, the scanning signal driver GD, image signal driver DD, the liquid crystal display element LCD and the scanning signal source circuit board GB, a tape carrier package that is connected between the video signal source circuit board DB (TCP) on Has been implemented.

  As shown in FIG. 1, in the liquid crystal display element LCD, a large number of video signal lines DATA extending in one direction (vertical direction in FIG. 1) having the effective display area SCR are arranged. FIG. 1 shows only one video signal line DATA among a plurality of video signal lines.

  The video signal line DATA transmits a signal supplied from the video signal driver DD installed between the liquid crystal display element LCD and the video signal source circuit board DB to the pixels in the effective display area SCR.

  The liquid crystal display element LCD is connected to a scanning signal driver GD installed between the liquid crystal display element LCD and the scanning signal source circuit board GB. The pixel controls the light by driving the liquid crystal based on the video signal and the scanning signal, and as a result, a predetermined display can be obtained.

The video signal source circuit board DB physically fixes the video signal driver DD and supplies a control signal and power supply power to the video signal driver DD.
The scanning signal source circuit board GB physically fixes the scanning signal driver GD and supplies a control signal and power supply power to the scanning signal driver GD.
The control circuit board CONT converts an image signal and power supply power supplied from an information processing device such as a personal computer by an appropriate method, and supplies the control signal and power supply power to the video signal source circuit board DB and the scanning signal source circuit board GB. Supply.

  Hereinafter, correction of disconnection of the video signal line DATA which is the essence of the present invention will be described. In FIG. 1, it is shown that there is a disconnection point DAN generated during the manufacturing process in the middle of a certain video signal line DATA. In this video signal line DATA, the signal is correctly transmitted from the video signal driver DD to the disconnection point DAN, but since no signal is transmitted to the portion below the disconnection point DAN, in order to correct the disconnection, The following configuration is provided.

  A first disconnection correction wiring DH1 and a second disconnection correction wiring DH2 are provided on the transparent glass substrate (see FIG. 8) surface of the liquid crystal display element LCD. Here, the one closer to the video signal driver DD is the first disconnection correction wiring DH1, and the farther is the second disconnection correction wiring DH2. Note that the disconnection correction wirings DH1 and DH2 extending in the horizontal direction in FIG. 1 intersecting with the plurality of video signal lines DATA through the insulating layer are formed by lines different from the video signal lines DATA, for example, scanning signal lines. And the same process and the same layer. Further, it is desirable that the widths of the disconnection correcting wirings DH1, DH2, and DHG are wide in order to reduce the resistance value. For example, the width is equal to or more than five times the width of the video signal line DATA, specifically, the same width as the scanning signal line. Formed to 25 μm.

  Further, a third disconnection correction wiring DHG for connecting the first disconnection correction wiring DH1 and the second disconnection correction wiring DH2 is provided on (or in) the scanning signal source circuit board GB.

  Further, the disconnection correction wiring DHG of the scanning signal source circuit board GB is connected to the first disconnection correction wiring DH1 and the second disconnection correction wiring DH2 on the liquid crystal display element LCD. This connection method includes various methods such as a connection method using a lead wire, a connection method using a dummy wiring of the scanning signal driver GD, and any method may be used.

  Further, one signal amplifier DA is inserted in the middle of the disconnection correction wiring DHG of the scanning signal source circuit board GB, for example, per one disconnection correction wiring. That is, the signal amplifier DA is provided on (or inside) the scanning signal source circuit board GB. The signal amplifier DA is composed of, for example, a single transistor or an OP amplifier provided on the scanning signal source circuit board GB.

Hereinafter, a method for correcting disconnection in such a configuration will be described.
First, the video signal line DATA in which the disconnection is generated at the disconnection point DAN and the disconnection correction wirings DH1 and DH2 provided in the liquid crystal display element LCD are the first intersections through the insulating layers of the two wirings. The high power laser is irradiated to the second disconnection correcting connection portions CN1 and CN2, and these portions are melted and connected. As a connection method, various methods such as a method using a conductive substance other than a method using the laser can be used, and any method may be used.

  As a result, the video signal is directly supplied from the video signal driver DD to the video signal line DATA where the disconnection has occurred, up to the disconnection point DAN, and the video signal line DD is connected to the portion below the disconnection point DAN. 1 disconnection correction connection portion CN1, first disconnection correction wiring DH1, third disconnection correction wiring DHG, signal amplifier DA, third disconnection correction wiring DHG, second disconnection correction wiring DH2, 2 is supplied via the disconnection correcting connection CN2.

  The signal transmitted during this time is delayed due to an increase in parasitic capacitance or resistance generated in the wiring routing portion, but the signal is amplified by the signal amplifier DA inserted in the middle of the disconnection correcting wiring DHG. Can be suppressed.

  As a result, the video signal supplied to the portion below the disconnection location DAN can be made substantially equivalent to the video signal supplied to the portion above the disconnection location DAN, and the disconnection location DAN resulting from the disconnection correction is bounded. It was possible to suppress subtle changes in brightness on the display screen.

In this reference embodiment, a first disconnection correcting wiring DH1, third disconnection correcting wiring DHG, signal amplifier DA, sets a and a second disconnection correcting wiring DH2, shows only one pair, Although the configuration in which only one video signal line DATA in which disconnection occurs can be corrected is shown, the number of video signal lines DATA in which disconnection can be corrected by providing a plurality of these sets (each providing wiring in parallel) is shown. Of course, it can be increased (the following reference embodiments 2 to 5 are also applied to the embodiment ).

Further, in the present reference embodiment, although the case in which the signal amplifier DA to the scanning signal source circuit board GB, signal amplifier DA may be provided on the liquid crystal display element LCD transparent glass substrate surface. In this case, for example, it is inserted into one of the first and second disconnection correction wirings DH1 and DH2. Also, the disconnection correcting wirings DH1, DH2, and DHG may all be provided in a “U” shape on the surface of the transparent glass substrate (see FIG. 2). Further, the signal amplifier DA may be provided on the video signal source circuit board DB. The signal amplifier DA is preferably provided at a position as close as possible to the video signal driver DD in order to reduce signal delay.

  Hereinafter, the disconnection inspection will be briefly described.

  The disconnection inspection process is carried out for the purpose of confirming the presence or absence of disconnection of the video signal line and the scanning signal line, and selecting defective substrates on which the disconnection has occurred. The disconnection inspection device generally includes a DC power supply device that generates an arbitrary voltage, an inspection needle connected to the power supply device, a DC ammeter, two inspection needles connected to the ammeter, and a liquid crystal to be inspected. It comprises a substrate stage on which the display substrate is placed and a driving device that moves the inspection needle vertically and horizontally.

In order to perform a disconnection inspection using such an inspection apparatus, first, a liquid crystal display substrate is placed on a substrate stage, and two inspection needles are connected to the two inspection terminals on both ends of the liquid crystal display substrate by a driving device. The voltage is applied to the signal line from the power supply device via the inspection needle and the inspection terminal, the current value is measured by an ammeter, the resistance of the signal line is calculated, and the presence / absence of disconnection is determined. When the current value is smaller than a predetermined lower limit threshold, it is determined that the disconnection is defective. Next, the inspection needle brought into contact with the inspection terminal is brought into contact with the next inspection terminal adjacent by the driving device, and the disconnection inspection of the next signal line adjacent to the signal line is performed. In this way, the inspection needles are sequentially moved by the driving device to inspect all the signal lines.
Hereinafter, other reference modes and embodiments of the present invention will be described, but only points different from the above-described reference mode 1 will be described, and description of common parts will be omitted.

Reference form 2
Figure 2 is a schematic plan view of the deployed driving circuit board to the liquid crystal display device and its peripheral portion according to a second reference of the present invention.
In this reference embodiment 2, the reference embodiment differs from the first, (1) the video signal driver DD, a scanning signal driver GD, that is mounted on the liquid crystal display element LCD transparent glass substrate (i.e., FCA (Flip chip attachment) method, COG (chip on glass)), (2) The control circuit board CONT is connected to the liquid crystal display element LCD, (3) Almost “U” -shaped disconnection correction wiring DH Is provided on the transparent glass substrate of the liquid crystal display element LCD, and (4) the signal amplifier DA is provided on the transparent glass substrate of the liquid crystal display element LCD and is inserted in the middle of the disconnection correcting wiring DH. is there.

Also in the present reference embodiment, as in the first reference embodiment, the video signal supplied to the lower part of the disconnection point DAN and the video signal supplied to the upper part of the disconnection part DAN are substantially equivalent. It was possible to suppress subtle changes in luminance on the display screen with the disconnection point DAN as a boundary due to the disconnection correction.

  That is, even in the FCA type liquid crystal display device in which the video signal driver DD and the scanning signal driver GD are installed on the liquid crystal display element LCD, high-quality line defect correction can be realized.

Incidentally, in the present reference, among the disconnection correcting wiring DH, portion extending in the lateral direction in FIG. 2 crossing via the plurality of video signal lines DATA insulating layer, different lines of the video signal lines DATA and the layer Thus, for example, it is formed by the same process and the same layer as the scanning signal line. Further, a portion of the disconnection correcting wiring DH extending in the vertical direction in FIG. 2 in parallel with the video signal line DATA is formed by the same process and the same layer as the video signal line DATA or the scanning signal line, for example. In the case where the laterally extending portion and the vertically extending portion of the disconnection correcting wiring DH are formed by different layers, both portions are connected via a contact hole or the like. Further, the signal amplifier DA is composed of, for example, a plurality of thin film transistors provided on a transparent glass substrate.

Shape state Figure 3 embodiment is a schematic plan view of a liquid crystal display element and arranged driving circuit board on the outer peripheral portion of the form status of the present invention.
Oite the shape condition of the present embodiment, the reference embodiment differs from the first, (1) a first disconnection correcting wiring DH1, video signal driver DD disconnection corrected video signal output DOUT of (driving IC chip) It is connected to (remaining signal output pins not connected to the video signal line DATA), and (2) a disconnection correcting address input ADDR is provided in the control circuit board CONT.

  The disconnection correction address input ADDR designates the address of the video signal line DATA in which the disconnection is detected by an inspection process or the like in the disconnection correction video signal output DOUT.

  The disconnection correcting video signal output DOUT is assigned to the remaining output pins not connected to the video signal line DATA in the effective display area of the video signal driver DD, and the video signal designated by the disconnection correcting address input ADDR. Is output.

With such a configuration, as in the foregoing first preferred reference video signal supplied to the video signal line DATA with broken portion DAN may be a case where not occur breakage substantially equivalents In addition, it was possible to suppress a subtle change in luminance at the boundary of disconnection or DAN due to disconnection correction.

  The feature of this embodiment is that the first disconnection correction wiring DH1 can be shortened by assigning the disconnection correction video signal output DOUT to the output terminal of the drive IC chip at the end. Since the parasitic capacitance and resistance of the main wiring can be reduced, signal delay can be suppressed, and higher-quality disconnection correction can be provided.

Reference form 3
Figure 4 is a schematic plan view of a liquid crystal display element and arranged driving circuit board on the outer peripheral portion of the reference embodiment 3 of the present invention.

In the present third reference, the reference embodiment differs from the first, (1) to be a video signal source circuit board DB, that are provided for disconnection modified wiring DHD, (2) a first disconnection correcting wiring DH1 is connected to the disconnection correction wiring DHD, (3) the signal amplifier DA is provided in the video signal source circuit board DB, and (4) the disconnection correction wiring DHD is connected to the scanning signal source circuit board. It is connected to the disconnection correcting wiring DHG provided in GB.

In this reference embodiment, the disconnection correction wiring DHD and the disconnection correction wiring DHG are connected inside the control circuit board CONT, but they may be directly connected without passing through the control circuit board CONT.

Features of this reference embodiment, since the provided signal amplifier DA to the video signal source circuit board DB, a video signal driver DD of the video signal line DATA which is broken, it is possible to reduce the distance between the signal amplifier DA ( 1), it is less susceptible to signal delay, and higher quality correction is possible.
The signal amplifier DA may be provided on the control circuit board CONT.

Reference form 4
Figure 5 is a schematic plan view of the deployed driving circuit board to the liquid crystal display device and its peripheral portion according to a fourth reference of the present invention.
In the present fourth reference, differs from the third embodiment of the reference, (1) a first disconnection correcting wiring DH1, that are formed in DD1 pieces each video signal driver, (2) each of the disconnection fixes That is, the wiring DH1 is connected to the disconnection correcting wiring DHD provided on the video signal source circuit board DB.

Also in the present reference, and for disconnection modified wiring DHD and disconnection correcting wiring DHG, but are connected inside the control circuit board CONT, it may be directly connected without passing through the control circuit board CONT.

Features of this reference embodiment, the disconnection correcting wiring DH1, because it forms the DD1 pieces each video signal driver, shortening the wiring length between the disconnection modified connection portions CN1 and disconnection correcting wiring DHD Therefore, it is difficult to be influenced by signal delay, and higher quality correction is possible.

Reference form 5
6 is a schematic plan view of a liquid crystal display element and arranged driving circuit board on the outer peripheral portion of the reference embodiment 5 of the present invention.
In Embodiment 5 of the present reference, the reference for the fourth differs from the (1) for connection disconnection correcting unit CN3, it is provided a video signal source circuit board on DB, (2) signal amplifier DA, the 1 is connected between the disconnection correction wiring DH1 and the disconnection correction connection portion CN3, and (3) only one disconnection correction connection portion CN3 is provided on the disconnection correction wiring DHD. is there.

Also in the present reference, and for disconnection modified wiring DHD and disconnection correcting wiring DHG, but are connected inside the control circuit board CONT, it may be directly connected without passing through the control circuit board CONT.

In this reference embodiment, the disconnection modified connecting portion CN3, because they provided on the video signal source circuit board DB, by a method such as soldering, it is possible to obtain a connection at the connecting portion CN3 for the cross line modification, You may connect using another method.

Features of this reference embodiment, the disconnection modified connecting portion CN3, to provide only one place on a wire breakage modified wiring DHD, the connected video signal other than the video signal line DATA in the cross line correcting connecting portion CN3 noise Since the signal amplifier DA can be brought close to the disconnection correcting connection CN1, it is difficult to be influenced by the signal delay, and higher quality correction is possible.

  As shown in FIG. 7, each pixel includes two adjacent scanning signal lines (gate signal lines or horizontal signal lines) GL and two adjacent video signal lines (drain signal lines or vertical signal lines) DL. They are arranged in the intersection area (in the area surrounded by four signal lines). Each pixel includes a thin film transistor TFT, a transparent pixel electrode ITO1, and a storage capacitor element Cadd. In the drawing, the scanning signal lines GL extend in the left-right direction (x direction), and a plurality of scanning signal lines GL are arranged in the up-down direction (y direction). The video signal lines DL extend in the vertical direction, and a plurality of video signal lines DL are arranged in the horizontal direction.

  As shown in FIG. 8, a thin film transistor TFT and a transparent pixel electrode ITO1 are formed on the lower transparent glass substrate SUB1 side with respect to the liquid crystal layer LC, and a color filter FIL and a light blocking black matrix pattern are formed on the upper transparent glass substrate SUB2 side. A BM is formed. A silicon oxide film SIO formed by dipping or the like is provided on both surfaces of the transparent glass substrates SUB1 and SUB2.

A light shielding film BM, a color filter FIL, a protective film PSV2, a common transparent pixel electrode ITO2 (COM), and an upper alignment film ORI2 are sequentially stacked on the inner surface (liquid crystal LC side) of the upper transparent glass substrate SUB2. Yes.
<< Equivalent circuit of LCD module >>
FIG. 9 is a block diagram showing a liquid crystal display element and circuits arranged on the outer periphery thereof. The drain driver section 103 is disposed only on the lower side of the TFT liquid crystal display element (TFT-LCD), and the XGA specification liquid crystal display element (TFT-LCD) composed of 800 × 3 × 600 pixels is disposed on the side surface portion. A gate driver unit 104, a controller unit 101, and a power supply unit 102 are arranged.
As described above, the drain driver unit 103 was formed by folding and mounting a multi-layer flexible substrate and was sufficiently compact.

  The controller unit 101 and the power supply unit 102 are mounted on the multilayer printed circuit board PCB. The interface board PCB on which the controller unit 101 and the power supply unit 102 are mounted is disposed on the back side of the gate driver unit 104 disposed on the outer peripheral portion of the short side of the liquid crystal element PNL. This is because there is a restriction on the width of the information processing apparatus (device), and it is necessary to reduce the width of the module MDL as the display unit as much as possible.

  As shown in FIG. 9, the thin film transistor TFT is arranged in an intersection region between two adjacent drain signal lines D and two adjacent gate signal lines G.

The drain electrode and the gate electrode of the thin film transistor TFT are connected to the drain signal line D and the gate signal line G, respectively.
Since the source electrode of the thin film transistor TFT is connected to the pixel electrode, and a liquid crystal layer is provided between the pixel electrode and the common electrode, a liquid crystal capacitor CLC is equivalently connected between the source electrode of the thin film transistor TFT.
The thin film transistor TFT becomes conductive when a positive bias voltage is applied to the gate electrode, and becomes non-conductive when a negative bias voltage is applied to the gate electrode.
In addition, a storage capacitor Cadd is connected between the source electrode of the thin film transistor TFT and the previous gate signal line.

It should be understood that the source electrode and the drain electrode are originally determined by the bias polarity between them, and the polarity is inverted during the operation in the circuit of this liquid crystal display device, so that the source electrode and the drain electrode are interchanged during the operation.
<Overall configuration of liquid crystal display module>
FIG. 10 is an exploded perspective view of the FCA liquid crystal display module MDL.
SHD is a shield case made of a metal plate (also called a metal frame), WD is a display window, SPC1 to 4 are insulating spacers, FPC1 and FPC2 are bent multilayer flexible circuit boards (FPC1 is a gate side circuit board, FPC2 is a drain side) Circuit board), PCB is an interface circuit board, ASB is an assembled liquid crystal display element with a drive circuit board, PNL is a liquid crystal display element having a driving IC mounted on one of the two transparent insulating substrates superimposed ( GC1 and GC2 are rubber cushions, PRS is a prism sheet (two sheets), SPS is a diffusion sheet, GLB is a light guide plate, RFS is a reflection sheet, and MCA is a lower case formed by integral molding. Mold case), LP for fluorescent tube, LPC for lamp cable, LCT for inverter Continued connector, GBS is a rubber bush for supporting the fluorescent tube LP, the liquid crystal display module MDL is assembled members are stacked in the arrangement relation of the upper and lower as shown in FIG.
<< Information processing device with LCD module MDL mounted >>
FIG. 11 is a perspective view of a notebook personal computer or word processor on which the liquid crystal display module MDL is mounted. Here, a case where the inverter IV is arranged in the display unit, that is, the inverter storage unit MI of the liquid crystal display module MDL is shown.

  Mounting the drive IC on the liquid crystal display element PNL, adopting a multilayer flexible board as the peripheral drain and gate driver peripheral circuit, and bending mounting to the drain driver circuit greatly improves the external shape The size can be reduced. In this example, since the drain driver peripheral circuit mounted on one side can be disposed on the upper side of the display unit above the hinge of the information processing device, compact mounting is possible.

  In the figure, the signal from the information processing device is first sent from the connector located at substantially the center of the left interface board PCB to the display control integrated circuit element (TCON), and the display data converted here is for the drain driver. Flows to the peripheral circuit. As described above, by using the FCA method and the multilayer flexible substrate, it is possible to eliminate restrictions on the outer shape of the width of the information processing device, and to provide a small-sized information processing device with low power consumption.

  Although the present invention has been specifically described above based on the embodiments, the present invention is not limited to the above-described embodiments, and it is needless to say that various changes can be made without departing from the scope of the invention. For example, it goes without saying that the present invention can also be applied to a horizontal electric field type active matrix type liquid crystal display device. In the above embodiment, the present invention is applied to the disconnection of the video signal line. However, the present invention can be similarly applied to the disconnection of the scanning signal line.

It is a schematic plan view of the liquid crystal display element of the reference form 1 of this invention and the circuit board for a drive arrange | positioned in the outer peripheral part. It is a schematic plan view of a liquid crystal display element and arranged driving circuit board on the outer peripheral portion of the FCA scheme Reference Embodiment 2 of the present invention. It is a schematic plan view of a liquid crystal display element and arranged driving circuit board on the outer peripheral portion of the form status of the present invention. It is a schematic plan view of the liquid crystal display element of the reference form 3 of this invention, and the drive circuit board arrange | positioned in the outer peripheral part. It is a schematic plan view of the liquid crystal display element of the reference form 4 of this invention, and the drive circuit board arrange | positioned in the outer peripheral part. It is a schematic plan view of the liquid crystal display element of the reference form 5 of this invention, and the circuit board for a drive arrange | positioned at the outer peripheral part. 1 is a plan view of a main part showing one pixel of an active matrix type color liquid crystal display element to which the present invention is applied and its periphery; FIG. It is a figure which shows the cross section of the video signal terminal vicinity to which the pixel part of a matrix is made into the center, the panel angle is on the left side, and the video signal drive circuit is connected to the right side. It is a block diagram which shows the equivalent circuit of a liquid crystal display module. It is a disassembled perspective view of the liquid crystal display module of FCA system. 1 is a perspective view of a notebook personal computer or word processor mounted with a liquid crystal display module. FIG. It is a schematic plan view of the conventional liquid crystal display element and its drive circuit board.

Explanation of symbols

  LCD ... Liquid crystal display element, SCR ... Effective display area (effective screen), GD ... Scanning signal driver, GB ... Scanning signal source circuit board, DD ... Video signal driver, DB ... Video signal source circuit board, CONT ... Control circuit board, DATA ... Video signal line, DAN ... Video signal line disconnection location, DH1, DH2, DHG, DH, DHD ... Disconnection correction wiring, CN1, CN2, CN3 ... Disconnection correction connection, DA ... Signal amplifier, DOUT ... Disconnection Video signal output for correction, ADDR ... Address input for disconnection correction.

Claims (4)

One of the two liquid crystal display substrates that are arranged to face each other via the liquid crystal layer and constitute the liquid crystal display element, extends in the x direction on the surface on the liquid crystal layer side of one of the liquid crystal display substrates, and y direction A plurality of scanning signal line groups arranged in parallel to each other and a video signal line group insulated from the scanning signal line groups and extending in the y direction and arranged in parallel in the x direction, In a liquid crystal display device in which a display region is configured by a region where the video signal line group intersects, and an active element and a pixel electrode are provided in a region surrounded by the scanning signal line and the video signal line, respectively.
A plurality of video signal drivers connected to the video signal line group are disposed on one side of the outside of the display area,
On the other side of the outside of the display region, a scanning signal driver connected to the scanning signal line group is disposed on a substrate different from the two liquid crystal display substrates,
Wherein the plurality pieces of video signal driver of the scan signal driver is not connected to the video signal lines arranged video signal driver closest to arranged side signal output pins on the wiring fix broken wires in Is connected ,
The disconnection correcting wiring passes through the wiring on the substrate on which the scanning signal driver is arranged from the surface on the liquid crystal layer side of the one liquid crystal display substrate, and does not intersect the scanning signal line group. A liquid crystal display device, wherein the liquid crystal display device is routed to a side opposite to a side where the video signal driver is arranged.   2. The liquid crystal display according to claim 1, wherein the disconnection correcting wiring is connected to a signal line disconnected in the video signal line group, and an address of the disconnected signal line is input to a signal control circuit. apparatus.   The liquid crystal display device according to claim 1, wherein a signal amplifier is connected to the wire for correcting disconnection. 4. The liquid crystal display device according to claim 3 , wherein a signal amplifier is connected to the disconnection correcting wiring, and the video signal driver is a video signal driver at the end closest to the signal amplifier.

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