JP5142964B2 - Display device - Google Patents

Description

  The present invention relates to a display device, and more particularly to a display device on which an IC having a memory is mounted.

  In recent years, an EEPROM (Electrically Erasable Programmable ROM) is mounted on many display devices as a memory of an IC used for a drive circuit. The EEPROM is one of semiconductor memories.

  The display device includes a display panel including a display unit, a drive unit on which a drive circuit is disposed, and a circuit board connected to one end of the drive unit via a flexible wiring board.

For example, according to Patent Document 1, in a liquid crystal display device, an EEPROM that is a nonvolatile memory is mounted on a circuit board connected to the periphery of the liquid crystal display panel. A technique is disclosed in which a land is connected to a nonvolatile memory and a probe connected to a writing system device corresponding to the land is connected to connect the nonvolatile memory and the writing system device to perform writing.
JP 2004-20825 A

  When writing information in the memory as described above, after the information to be stored is input, a high voltage signal is supplied to complete the storage of the information. The writing terminal for supplying the high voltage signal may be provided on the flexible wiring board.

  When the writing terminal is arranged on the flexible wiring board, for example, it is desirable to provide a terminal electrode having a side of 1.0 mm or more and a cover lay opening having a side of 1.5 mm or more on the terminal electrode.

  However, when such a writing terminal is provided on the flexible substrate, there are cases where restrictions are placed on the routing of the wiring on the flexible wiring substrate. In recent years, it has become difficult to provide a writing terminal having a desired size due to an increase in the number of wirings arranged on the flexible wiring board and a reduction in the size of the flexible wiring board.

  In this case, since the size of the writing terminal is not sufficient, when the probe for applying a high voltage signal is brought into contact with the writing terminal, a deviation between the probe and the writing terminal occurs, and the high voltage is generated in the memory. There was a case where the signal was not supplied and the manufacturing yield was lowered.

  Furthermore, due to the design of the flexible wiring board, the writing terminal may be arranged on the back surface (opposite side of the display screen) of the flexible wiring board, so that the workability of applying the probe is deteriorated and the manufacturing yield may be reduced. In some cases, a connection jig or the like is required to improve workability.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a display device that improves manufacturing yield and reduces manufacturing cost.

  A display device according to an aspect of the present invention includes a display panel including a display unit and a driving unit in which a driving IC that supplies a driving signal to the display unit is disposed. The driving IC includes a memory and the memory An input terminal to which a signal to be supplied is input, and the drive unit is electrically connected to the connection electrode electrically connected to the input terminal via the connection electrode And a writing terminal.

  According to the present invention, it is possible to provide a display device that improves the manufacturing yield and reduces the manufacturing cost.

  A display device according to an embodiment of the present invention will be described below with reference to the drawings. In this embodiment, an example in which a liquid crystal display device is applied as a display device will be described. However, the present invention is not limited to this example, and the display device may be a plasma display device, an organic electroluminescence (EL) display device, or the like. May be.

  The display device according to the present embodiment includes a display panel including a display unit and a drive unit in which a drive IC that supplies a drive signal to the display unit is disposed. That is, as shown in FIG. 1, the liquid crystal display device according to the present embodiment includes a liquid crystal display panel 100 having a substantially rectangular flat plate shape. The liquid crystal display panel 100 includes a pair of substrates, that is, an array substrate 200, a counter substrate 300 disposed so as to face the array substrate 200, and a liquid crystal layer 600 held between the array substrate 200 and the counter substrate 300. , Is composed of.

  The array substrate 200 and the counter substrate 300 are bonded together with a sealant 110. The liquid crystal display panel 100 includes a display unit 120 that displays an image on the inner side surrounded by the sealing material 110. The display unit 120 includes a plurality of pixels PX arranged in a matrix.

  The array substrate 200 is arranged along the column direction V of the plurality of scanning lines Y (1, 2, 3,..., M) arranged along the row direction H of the pixels PX in the display unit 120. A plurality of signal lines X (1, 2, 3,..., N), a switch element 220 disposed at the intersection of the signal line X and the scanning line Y in the pixel PX, and each pixel PX. And a pixel electrode 230 connected to the switch element 220.

  As shown in FIG. 2, the array substrate 200 includes an insulating substrate 210 having light transmissivity such as glass. The switch element 220 is disposed on the insulating substrate 210 and is configured by a thin film transistor (TFT) including a semiconductor layer 242 formed of, for example, amorphous silicon or polysilicon.

  The gate electrode 222 of the switch element 220 is disposed on the insulating substrate 210. The gate electrode 222 is connected to the scanning line Y (or the gate electrode 222 is formed integrally with the scanning line Y). The source electrode 225 of the switch element 220 is connected to the signal line X (or the source electrode 225 is formed integrally with the signal line X). The drain electrode 227 of the switch element 220 is connected to the pixel electrode 230.

  A source electrode 225 and a drain electrode 227 of the switch element 220 are in contact with the semiconductor layer 242 of the switch element 220. These source electrode 225 and drain electrode 227 are covered with an interlayer insulating film 244.

  The pixel electrode 230 is disposed on the interlayer insulating film 244 so as to correspond to each pixel PX. The pixel electrode 230 is electrically connected to the drain electrode 227 through a contact hole CH formed in the interlayer insulating film 244.

  The pixel electrode 230 is formed of a light-transmitting conductive material such as indium tin oxide (ITO) in a transmissive liquid crystal display device that selectively transmits backlight and displays an image. Is done. In a reflective liquid crystal display device that displays an image by selectively reflecting outside light, the reflective liquid crystal display device is formed of a light-reflective conductive material such as aluminum (Al).

  The counter substrate 300 includes an insulating substrate 310 having light transmissivity, such as glass, and a counter electrode 330 common to the plurality of pixels PX in the display unit 120 so as to face the pixel electrode 230 through the liquid crystal layer 600. I have.

  In the color display type liquid crystal display device, the display unit 120 includes a plurality of types of pixels, for example, a red pixel that displays red (R), a green pixel that displays green (G), and a blue pixel that displays blue (B). have.

  In the example illustrated in FIG. 2, the counter substrate 300 includes a color filter layer 320 on one main surface (that is, a surface facing the liquid crystal layer 600) on the insulating substrate 310 in the display unit 120. The color filter layer 320 corresponds to a red pixel that transmits light of a red dominant wavelength, corresponds to a green pixel, corresponds to a green color filter that transmits light of a green dominant wavelength, and corresponds to a blue pixel. And a blue color filter that transmits light having a blue main wavelength.

  Such a color filter layer 320 may be provided on the array substrate 200 side. In addition, the counter substrate 300 may include an overcoat layer disposed with a relatively thick film thickness that flattens the unevenness of the surface of the color filter layer 320.

  The counter electrode 330 is disposed in the display unit 120 so as to face the pixel electrode 230 with the liquid crystal layer 600 interposed therebetween. The counter electrode 330 is disposed on the color filter layer 320 so as to face the plurality of pixel electrodes 230 in the display unit 120. The counter electrode 330 is formed of a light-transmitting conductive material such as ITO or IZO, for example.

  The surfaces of the array substrate 200 and the counter substrate 300 are covered with an alignment film 250 and an alignment film 350, respectively. The array substrate 200 and the counter substrate 300 are arranged at a predetermined interval by a spacer (not shown). The liquid crystal layer 600 is made of a liquid crystal material including liquid crystal molecules sealed between the array substrate 200 and the counter substrate 300.

  In the transmissive liquid crystal display panel, optical elements 260 and 360 are provided on the outer surfaces of the array substrate 200 and the counter substrate 300 (that is, the surface opposite to the surface in contact with the liquid crystal layer 600 of the array substrate 200 and the counter substrate 300), respectively. Is provided. These optical elements 260 and 360 include a polarizing plate whose polarization direction is set in accordance with the characteristics of the liquid crystal layer 600.

  In addition, the liquid crystal display panel 100 includes a drive IC 130 outside the display unit 120. The drive IC 130 is disposed on an extended portion (drive portion) 200 </ b> A of the array substrate 200 that extends outward from the end portion 300 </ b> A of the counter substrate 300. The driving IC 130 includes a memory 150 and an input terminal 131 to which a signal supplied to the memory 150 is input.

  The extending portion 200 </ b> A includes a connection electrode 132 electrically connected to the input terminal 131, and a writing terminal 151 electrically connected to the connection electrode 132 via a connection wiring 140. That is, the memory 150 and the writing terminal 151 are electrically connected.

  Incidentally, for example, an EPPROM is mounted on the drive IC 130 as the memory 150. Signal writing to the memory 150 is completed by applying a probe (not shown) to the write terminal 151 and applying a high voltage to the memory 150 via the write terminal 151.

  Furthermore, the liquid crystal display panel 100 includes a wiring substrate 400 connected to one side edge of the extending portion 200A, for example, a wiring substrate (FPC: flexible printed circuit) 400. The wiring board 400 includes a plurality of connection terminals (not shown), and electrically connects the connection terminals to a plurality of connection electrodes (not shown) arranged in the extending part 200A to thereby provide a signal to the drive IC 130. Is electrically connected to a wiring (not shown) for supplying. The wiring board 400 supplies a control signal and power to the drive IC 130, for example.

  In the first embodiment, the write terminal 151 is disposed on the array substrate 200. In the example shown in FIG. 1, the write terminal 151 is disposed in the extending part 200A. The connection wiring 140 is disposed on the array substrate 200.

  In the first embodiment, since the write terminal 151 is arranged on the array substrate 200, the write terminal 151 can be arranged without being restricted by the routing of the wiring on the wiring board 400.

  Further, since there is no restriction on the routing of the wiring on the wiring substrate 400, the writing terminal 151 having a large diameter can be arranged. The diameter of the write terminal 151 is the short side of the write terminal 151 when the write terminal 151 is substantially rectangular. The diameter of the writing terminal 151 is the short axis of the writing terminal 151 when the writing terminal 151 is substantially circular. As a result, it is possible to prevent the probe and the write terminal 151 from being displaced when the probe is applied. That is, it is possible to prevent a decrease in manufacturing yield.

  Further, by arranging the write terminal 151 in the extending portion 200 </ b> A of the array substrate 200, the write terminal 151 is not arranged on the back surface of the wiring substrate 400. Accordingly, it is possible to prevent a decrease in workability to which the probe is applied, and further, a dedicated jig or the like for improving workability is not required. That is, it is possible to prevent a decrease in manufacturing yield and an increase in manufacturing cost.

  As described above, according to the display device according to the present embodiment, it is possible to provide a display device that improves the manufacturing yield and reduces the manufacturing cost.

  Further, in the present embodiment, the connection wiring 140 may be formed in the same layer as the gate electrode 222 or the source electrode 225 and the drain electrode 227 of the switch element 220. Accordingly, the connection wiring 140 can be formed using the same material and the same process as the gate electrode 222, the source electrode 225, and the drain electrode 227. In forming the connection wiring 140, a new material is not required. That is, it is possible to suppress an increase in work constant and an increase in manufacturing cost.

  Further, the connection wiring 140 may be a two-layer wiring formed in the same layer as the gate electrode 222 and the source electrode 225 / drain electrode 227 electrode. By using the connection wiring 140 as a two-layer wiring, a connection failure between the write terminal 151 and the input terminal 131 can be suppressed.

  Next, a second embodiment will be described with reference to FIG. In the following description, the same components as those of the liquid crystal display device according to the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the second embodiment, the write terminal 151 is disposed on the array substrate 200. The write terminal 151 is disposed in the extending part 200A. The connection wiring 140 is disposed on the wiring substrate 400 and the array substrate 200.

  At this time, the connection wiring 140 is disposed on the extension portion 200A, the first wiring 140A connected to the connection electrode (not shown), and the wiring substrate 400. The first terminal 410A and the second terminal 410B are connected to each other, the second wiring 140B connected to the first wiring 140A via the first terminal 410A, and the extending portion 200A are disposed on the second terminal. The third wiring is configured to connect the terminal 410B and the writing terminal 151.

  With such a configuration, even if it is difficult to arrange the connection wiring 140 on the array substrate 200, the write terminal 151 is arranged without being restricted by the routing of the wiring on the wiring substrate 400. It becomes possible to do.

  That is, according to the liquid crystal display device according to the second embodiment, as in the first embodiment, it is possible to provide a display device that improves the manufacturing yield and reduces the manufacturing cost.

  In addition, this invention is not limited to the said embodiment itself, In the stage of implementation, it can change and implement a component within the range which does not deviate from the summary. 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.

  In the first embodiment and the second embodiment, the substantially rectangular writing terminal 151 has been described as an example. However, the present invention is not limited to this example, and the writing terminal 151 has a square shape, a parallelogram shape, and a rhombus shape. Also good.

FIG. 1 is a diagram schematically showing a configuration example of a liquid crystal display panel of a liquid crystal display device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view schematically showing a pixel configuration and a switch configuration in the liquid crystal display panel shown in FIG. FIG. 3 is a diagram schematically showing another configuration example of the liquid crystal display panel of the liquid crystal display device according to the second embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 120 ... Display part 200A ... Drive part 130 ... Drive IC 150 ... Memory 131 ... Input terminal 132 ... Connection electrode 140 ... Connection wiring 151 ... Writing terminal

Claims (3)

A display panel comprising: a display unit; and a drive unit in which a drive IC that supplies a drive signal to the display unit is disposed.
The drive IC includes a memory and an input terminal to which a signal supplied to the memory is input.
The drive unit includes a connection electrode electrically connected to the input terminal, and a writing terminal electrically connected to the connection electrode via a connection wiring ,
A wiring board connected to one side edge of the driving unit and supplying a signal to the driving IC;
The connection wiring is disposed on the driving unit and connected to the first wiring connected to the connection electrode, and the first terminal on the wiring board and the second terminal are connected to the wiring board. And a second wiring connected to the first wiring via the first terminal, and a third wiring arranged on the driving unit and connecting the second terminal and the writing terminal. A display device provided . The display device according to claim 1, wherein the memory is an EEPROM . The display device according to claim 1, wherein the display panel includes a pair of substrates disposed to face each other and a liquid crystal layer disposed between the pair of substrates .

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