JP2009080350A - Liquid crystal display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display wherein production yield is improved, by preventing breakage of a display pixel by static electricity to reduce defects due to screen abnormality, and the like. <P>SOLUTION: In the liquid crystal display having a pair of substrates 3 and 4, disposed opposite to each other, a liquid crystal layer LQ, held between the pair of substrates 3 and 4 and a display part DYP comprising a plurality of display pixels PX disposed in a matrix shape and further having mounted electrodes E1, to which driving signals of the display part DYP are supplied; a bus wiring WB disposed in the vicinity of the mounted electrodes E1 and a float electrode EF, disposed between the bus wiring WB and the mounted electrodes E1, the float electrode EF has a first charge derive part EF1, the charge derive part EF1 is disposed so as to be opposed to a second charge derive part R1 connected to a resistance part R, and the resistance part R is connected to a short-circuiting line WS. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a liquid crystal display device, and more particularly to an active matrix type liquid crystal display device.

  A display device such as a liquid crystal display device includes an array substrate and a counter substrate that are opposed to each other, and includes a display unit that includes matrix display pixels. The display section includes various wirings such as a plurality of scanning lines extending along the row direction of the display pixels and a plurality of signal lines extending along the column direction of the display pixels. These scanning lines and signal lines are drawn out to the outer peripheral portion of the display unit.

  A plurality of electrodes to which various wirings such as scanning lines and signal lines are connected are arranged on the outer periphery of the display unit. A driving signal source such as a driving IC or a flexible wiring board for supplying a driving signal to the display unit is mounted on the plurality of electrodes.

  In recent years, a manufacturing process for manufacturing the display device using a large substrate has become widespread. When a display device is manufactured using a large substrate, the amount of charge on the substrate surface also increases, and display pixels and the like are destroyed by static electricity, which may cause a manufacturing yield.

Conventionally, there has been proposed a liquid crystal display device that can easily and accurately perform electrical inspection of a device without impairing the function of protecting the device from static electricity (see Patent Document 1).
JP 2002-99224 A

  However, in the above-described liquid crystal display device, the resistor is arranged before inducing the electric charge charged in the short-circuit line. If a resistor is placed between the conductive layer and the short-circuit line, the charge charged in the conductive layer is less likely to be induced in the short-circuit line, so that static electricity charged in the conductive layer is induced in the mounting electrode and the display pixel is destroyed. There was a case.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a liquid crystal display device that prevents electrostatic breakdown of display pixels, reduces defects due to screen abnormalities, etc., and improves production yield. To do.

  A liquid crystal display device according to an aspect of the present invention includes a pair of substrates disposed to face each other, a liquid crystal layer sandwiched between the pair of substrates, and a display unit including a plurality of display pixels arranged in a matrix. A mounting electrode to which a driving signal for the display unit is supplied, a bus wiring disposed in the vicinity of the mounting electrode, and a space between the bus wiring and the mounting electrode. A float electrode, and the float electrode has a first charge induction portion, the charge induction portion is disposed opposite to a second charge induction portion connected to a resistance portion, and the resistance portion is Connected to the short-circuit wire.

  According to the present invention, it is possible to provide a liquid crystal display device that prevents electrostatic breakdown of display pixels, reduces defects due to screen abnormalities, etc., and improves production yield.

  Hereinafter, a display device according to the present invention will be described with reference to the drawings. The display device according to an embodiment of the present invention is a liquid crystal display device including a liquid crystal display panel 1 having a substantially rectangular flat plate shape as shown in FIG.

  The liquid crystal display panel 1 is composed of a pair of substrates arranged opposite to each other, that is, an array substrate 3 and a counter substrate 4, and a liquid crystal layer LQ held as a light modulation layer between the pair of substrates.

  The liquid crystal display panel 1 includes a substantially rectangular display portion DYP for displaying an image and a peripheral portion 12 surrounding the display portion DYP. The display unit DYP includes a plurality of display pixels PX arranged in a matrix.

  The array substrate 3 includes wirings arranged in the display unit DYP, for example, a plurality of scanning lines Y (1, 2, 3,..., M) extending along the row direction of the display pixels PX, and the display pixels PX. A plurality of signal lines X (1, 2, 3,..., N) extending along the column direction are provided.

  The array substrate 3 is connected to the pixel switch SW1 and the pixel switch SW1 arranged for each display pixel PX in the vicinity of the intersection of the scanning line Y and the signal line X in addition to these various wirings in the display unit DYP. The pixel electrode PE and the like are provided.

  The gate electrode GE of the pixel switch SW1 is electrically connected to the corresponding scanning line Y (or formed integrally with the scanning line). The source electrode SE of the pixel switch SW1 is electrically connected to the corresponding signal line X (or formed integrally with the signal line). The drain electrode DE of the pixel switch SW1 is electrically connected to the pixel electrode PE of the corresponding display pixel PX. The surface of the pixel electrode PE is covered with an alignment film (not shown).

  The liquid crystal display panel 1 is driven by the display unit DYP on the extended portion 3A of the array substrate 3 that extends outward from the end 4E of the counter substrate 4 in the peripheral portion 12 surrounding the display portion DYP. It has a first connection part CA1 for connecting a drive IC that functions as a drive signal source for supplying signals, and a second connection part CA2 for connecting a flexible substrate FPC.

  A signal or the like from the flexible substrate FPC is input to the input terminal E1 of the first connection part CA1. A wiring W1 extending to the display unit DYP is electrically connected to the output terminal E2 of the first connection unit CA1. The wiring W1 is a wiring connected to a common wiring (not shown) for supplying a common potential in addition to the signal line X and the scanning line Y.

  As shown in FIGS. 1 and 2, the liquid crystal display device according to the present embodiment has a bus wiring WB in the vicinity of the input terminal E1. The bus wiring WB has a larger area than the various wirings W1.

  A float electrode FE is disposed between the bus wiring WB and the input terminal E1. The float electrode FE has a discharge induction part FE1. The tip of the discharge induction part FE1 is sharp at an acute angle.

  The tip of the discharge induction part FE1 of the float electrode FE faces the tip of the discharge induction part R1 of the resistance part R. The tip of the discharge inducing portion R1 is also sharp at an acute angle. The resistance portion R is electrically connected to the short-circuit line WS. That is, the discharge inducing portion FE1 of the float electrode FE and the discharge inducing portion R1 of the resistance portion R both have an acute tip portion and are arranged so that the tip portions face each other.

  In the liquid crystal display device according to the present embodiment, the resistor R has a thin film transistor (TFT) as a resistor.

  That is, the electric charge charged to the bus line WB is induced not to the input terminal E1 but to the float electrode FE. The charges induced in the float electrode FE are induced from the discharge induction part FE1 of the float electrode FE to the resistance part R via the discharge induction part R1. The charge induced in the resistance part R passes through the resistance part R and is induced in the short-circuit line WS.

  As described above, the float electrode FE is provided between the bus line WB and the input terminal E1, and the tip of the discharge induction portion FE1 of the float electrode FE and the tip of the discharge induction portion R1 of the resistance portion R are arranged to face each other. By doing so, it is possible to prevent the electric charge charged in the bus line WB from being induced to the input terminal E1.

  Therefore, by disposing the float electrode FE and the resistance portion R on the array substrate as described above, charges are prevented from being induced to the mounting electrode, and the display pixel is prevented from being damaged by static electricity, thereby causing defects such as abnormal screens. Can be reduced.

  The counter substrate 4 includes a counter electrode CE common to all the display pixels PX in the display unit DYP. The counter electrode CE is formed of a light-transmitting conductive member such as indium tin oxide (ITO). The surface of the counter electrode CE is covered with an alignment film (not shown).

  The array substrate 3 and the counter substrate 4 are arranged in a state in which an alignment film (not shown) on the pixel electrode PE and an alignment film on the counter electrode CE are opposed to each other via a liquid crystal layer LQ. It is bonded together by a seal member (not shown). The liquid crystal layer LQ is formed of a liquid crystal composition sealed in the space between the array substrate 3 and the counter substrate 4.

  The array substrate 3 and the counter substrate 4 have a polarizing plate (not shown) attached to the main surface opposite to the liquid crystal layer LQ.

  The liquid crystal display panel 1 of the color display type liquid crystal display device has a plurality of types of display pixels, for example, a red pixel that displays red, a green pixel that displays green, and a blue pixel that displays blue. That is, the red pixel includes a red color filter that transmits light having a red main wavelength. The green pixel includes a green color filter that transmits light having a green dominant wavelength. The blue pixel includes a blue color filter that transmits light having a blue main wavelength. A color filter layer (not shown) made of these color filters is disposed on the main surface on the liquid crystal layer LQ side in the display unit DYP of the counter substrate 4.

  A light shielding layer (not shown) is formed between the color filters (that is, between display pixels) of the counter substrate 4 and around the display unit. The light shielding layer formed between the color filters is disposed so as to face the signal lines X and the scanning lines Y on the array substrate 3. This light shielding layer is formed by, for example, a colored resin colored black.

  As described above, according to the liquid crystal display device of this embodiment, it is possible to provide a liquid crystal display device that prevents electrostatic breakdown of display pixels, reduces defects due to screen abnormalities, etc., and improves production yield.

  In the liquid crystal display device according to the present embodiment, the resistor portion R has a TFT as a resistor. Since the TFT disposed in the resistor portion R is only different in size (W / L) from the TFT disposed as the pixel switch SW, it is possible to increase the number of manufacturing steps in order to form the resistor portion R. Absent.

  That is, according to the liquid crystal display device according to the present embodiment, it is possible to prevent electrostatic breakdown of the display pixels without increasing the number of manufacturing steps.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage.

  Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

1 is a diagram schematically showing an example of a liquid crystal display device according to an embodiment of the present invention. FIG. 3 is a diagram for explaining an example of a configuration in the vicinity of a mounting electrode of the liquid crystal display device shown in FIG. 1.

Explanation of symbols

3 ... Array substrate, 4 ... Counter substrate, LQ ... Liquid crystal layer, PX ... Display pixel, DYP ... Display unit, E1 ... Input electrode (mounting electrode), WB ... Bus wiring, EF ... Float electrode, EF1 ... First charge induction Part, R ... resistor part, R1 ... second charge induction part, WS ... short circuit line.

Claims (3)

A liquid crystal display device having a pair of substrates disposed to face each other, a liquid crystal layer sandwiched between the pair of substrates, and a display unit including a plurality of display pixels arranged in a matrix,
A mounting electrode to which a driving signal of the display unit is supplied;
Bus wiring disposed in the vicinity of the mounting electrode;
A float electrode disposed between the bus wiring and the mounting electrode,
The float electrode has a first charge inducing portion;
The charge induction part is disposed to face the second charge induction part connected to the resistance part,
The said resistance part is a liquid crystal display device connected to the short circuit line. The first charge induction part has an acute-angle first tip part,
2. The liquid crystal display device according to claim 1, wherein the second charge induction portion has an acute-angle second tip portion disposed to face the first tip portion.   The liquid crystal display device according to claim 1, wherein the resistance portion includes a thin film transistor.

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