JP5430197B2 - Liquid crystal display element - Google Patents

Description

  The present invention relates to a liquid crystal display element.

  In general, a liquid crystal display element called LCOS (Liquid Crystal On Silicon) is bonded to a silicon substrate having a pixel electrode formed on the surface thereof and a glass substrate having a counter electrode formed on the surface thereof in a predetermined positional relationship. A liquid crystal display panel in which liquid crystal is injected between the substrates is mounted on a circuit substrate or a base, a potential difference is applied between the pixel electrode and the counter electrode, and various displays are obtained by controlling the alignment of the liquid crystal.

  The supply of the potential to the liquid crystal display element is realized by connecting the silicon substrate and the electrode pad on the circuit substrate with a wire and making them electrically conductive. On the other hand, the potential is supplied to the counter electrode by applying a thermosetting conductive resin such as silver paste between the glass substrate and the circuit board to electrically connect the counter electrode and the electrode pad on the circuit board. Is realized.

  FIG. 2 is a cross-sectional view of the liquid crystal display element. Reference numeral 1 denotes a first electrode substrate having a plurality of pixel electrodes (not shown), for example, a silicon substrate. Reference numeral 2 denotes a second electrode substrate having a counter electrode 6 facing the silicon substrate, for example, a glass substrate. Since the silicon substrate 1 and the glass substrate 2 are electrically connected to the electrode pad 4 and the electrode pad 8 on the circuit substrate 3, the liquid crystal display panel is configured by being bonded to each other via a liquid crystal (not shown). .

  The pixel electrode (not shown) formed on the silicon substrate 1 is electrically connected to the electrode pad 4 of the circuit substrate 3 by the wire 5, and the counter electrode 6 formed on the glass substrate 2 is connected to this electrode electrode 4. It is electrically connected to the electrode pad 8 on the circuit board 3 disposed at the opposite position, and a different potential is supplied to each of the pixel electrodes. In addition, a conductive pedestal 10 is fixed on the electrode pad 8, and a conductive resin 7 is applied to the gap between the end surface portion of the pedestal 10 and the counter electrode 6 formed on the glass substrate 2 to make an electrical connection. Therefore, by reducing the amount of the conductive resin 7 applied, the color unevenness caused by the thermal stress of the conductive resin 7 is prevented. (See Patent Document 1)

JP 2006-308824 A

A first electrode substrate having a plurality of pixel electrodes and a second electrode substrate having a counter electrode facing the first electrode substrate, wherein the first electrode substrate and the second electrode substrate are bonded together at a predetermined position and interval. A liquid crystal display panel
A liquid crystal display element in which a counter electrode of the second electrode substrate and an electrode pad provided on the opposing surface of the circuit substrate are electrically connected via a conductive resin,
A conductive pedestal having a through hole is interposed between the counter substrate of the second electrode substrate to which the conductive resin is applied and the electrode pad of the circuit board, and the conductive material is inserted into the through hole of the conductive pedestal. Liquid crystal display element provided with a conductive relaxation portion that relieves thermal stress of the conductive resin.

  As shown in FIG. 2, a conductive pedestal 10 is fixed on the electrode pad 8, and a conductive resin 7 is applied to a gap between the end surface portion of the pedestal 10 and the counter electrode 6 formed on the glass substrate 2. Regarding the liquid crystal display element which is electrically connected and prevents the color unevenness caused by the thermal stress of the conductive resin 7 by reducing the coating amount of the conductive resin 7, the circuit board In a circuit board 1 having a degree of freedom (flexibility), such as FPC, for example, the FPC deforms following the expansion and contraction of the conductive resin 7, which is effective in relieving thermal stress. For example, a thermal stress of the conductive resin 7 cannot be completely prevented for a substrate having no degree of freedom in shape, such as a glass epoxy substrate.

  In addition, when a desired gap (not shown) of the liquid crystal injection portion of the liquid crystal display panel is reduced, color unevenness due to thermal stress of the conductive resin 7 appears more prominently. Even if the amount of the conductive resin applied is reduced to reduce the thermal stress, the color unevenness of the liquid crystal display panel cannot be completely solved.

A first electrode substrate having a plurality of pixel electrodes and a second electrode substrate having a counter electrode facing the first electrode substrate, wherein the first electrode substrate and the second electrode substrate are bonded together at a predetermined position and interval. A liquid crystal display panel
A liquid crystal display element in which a counter electrode of the second electrode substrate and an electrode pad provided on the opposing surface of the circuit substrate are electrically connected via a conductive resin,
Wherein said applying a conductive resin and the second electrode substrate opposite electrode between the electrode pads of the circuit board, by interposing a conductive base seat having a through hole,
The through holes of said conductive base, a conductive resin having flexibility to relieve thermal stress of the conductive resin, the upper surface thereof is filled to be lower than the upper surface of said conductive base and filling the Forming a space surrounded by the side surface of the through hole of the conductive base on the upper surface of the conductive resin;
A liquid crystal display element is provided in which the space is filled with one end of the conductive resin that electrically connects the counter electrode of the second electrode substrate and the electrode pad of the circuit board .

  A conductive pedestal having a through hole is interposed between the counter electrode of the second electrode substrate and the electrode pad of the circuit board, and the thermal stress of the conductive resin is relieved in the through hole of the conductive pedestal. By providing the conductive relaxation portion, the effect of reducing the amount of the conductive resin and the thermal stress of the conductive resin can be relaxed, and problems due to the thermal stress of the conductive resin can be prevented.

It is a figure which shows the liquid crystal display element by this invention, (A) is a top view, (B) is AA 'sectional drawing, (C) is B section detail drawing. It is a figure which shows the liquid crystal display element by a prior art, and is sectional drawing.

A first electrode substrate having a plurality of pixel electrodes and a second electrode substrate having a counter electrode facing the first electrode substrate, wherein the first electrode substrate and the second electrode substrate are bonded together at a predetermined position and interval. A liquid crystal display panel
A liquid crystal display element in which the counter electrode of the second electrode substrate and the electrode pad provided on the opposing surface of the circuit substrate are electrically connected via a conductive resin, for example, silver paste,
A conductive pedestal having a through hole, for example, 42 alloy, is interposed between the counter substrate of the second electrode substrate to which the conductive resin is applied and the electrode pad of the circuit substrate, and penetrates the conductive pedestal. A liquid crystal display element in which a hole is provided with a conductive relaxation portion that relaxes thermal stress of the conductive resin, for example, a conductive resin having excellent flexibility.

  The conductive resin excellent in flexibility includes, for example, a conductive adhesive, but the conductive resin excellent in flexibility is specialized in flexibility because the purpose is to reduce thermal stress of the conductive resin. It is preferable to select the material. At this time, if all of the conductive resin is changed to a conductive resin having excellent flexibility, adverse effects occur in reliability such as durability. Therefore, the conductive resin having excellent flexibility is a through hole of the conductive pedestal. It is preferable to use only part.

  1A and 1B are diagrams showing a liquid crystal display device according to the present invention, in which FIG. 1A is a top view, FIG. 1B is a cross-sectional view taken along line AA ′, and FIG. In addition, about the member which is common in a prior art, it demonstrates using the same code | symbol.

  Reference numeral 1 denotes a first electrode substrate having a plurality of pixel electrodes (not shown), for example, a silicon substrate. Reference numeral 2 denotes a second electrode substrate having a counter electrode 6 opposed to the silicon substrate 1, for example, a glass substrate. Since the silicon substrate 1 and the glass substrate 2 are electrically connected to the electrode pad 4 and the electrode pad 8 on the circuit substrate 3, the liquid crystal display panel is configured by being bonded to each other through a liquid crystal (not shown) in a shifted positional relationship. .

The circuit board 3 shown in the present embodiment is made of a substrate having a certain degree of strength (for example, a glass epoxy substrate), but is not limited to the above-described configuration.

  Pixel electrodes (not shown) formed on the silicon substrate 1 are electrically connected to the electrode pads 4 of the circuit board 3 by wires 5. Further, the counter electrode 6 formed on the glass substrate 2 is electrically connected to the electrode pad 8 on the circuit substrate 3 disposed at a position facing the glass substrate 2, and is supplied with a potential different from that of the pixel electrode. The Here, the feature of the present invention is that the conductive pedestal 11 having a through hole is fixed on the electrode pad 8, and the through hole 12 portion of the pedestal 11 is filled with a conductive resin 13 having flexibility, The conductive resin 7 is applied and electrically connected to the gap between the base 11 and the counter electrode 6 formed on the glass substrate 2. The distance between the counter electrode 6 and the electrode pad 8 is about 1.0 mm, and the height of the pedestal 11 having the through hole interposed in the distance is about 0.8 mm. The resin 13 is filled in the 0.8 mm through hole, and the conductive resin 7 is applied to a gap of about 0.2 mm.

According to the present invention, the pedestal 11 having the through hole 12 is interposed in the gap between the counter electrode 6 and the electrode pad 8, and the purpose is to relieve stress due to heat of the conductive resin 7. By providing the base 11 with the through hole 12 and filling the conductive resin 13, the expansion and contraction of the conductive resin 7 in an environment where the temperature is repeatedly increased and decreased without losing electrical connection. Thus, it is possible to provide a liquid crystal display element that eliminates defects such as color unevenness caused by.
Further, regarding the thermal stress relaxation of the conductive resin 7, since the through hole 12 is an object, the influence of the relaxation also changes depending on the area of the through hole 12. Therefore, the through hole 12 has the conductive property. It is preferable that the resin 7 and the pedestal 11 have a large area with respect to the installation surface.

  Further, the pedestal 11 having the through hole 12 is made of a material having a linear expansion coefficient substantially equal to the linear expansion coefficient of the glass substrate 2. By setting it as this structure, the distortion of the glass substrate 2 can be relieve | moderated and the conduction | electrical_connection defect by peeling of the conductive resin 7 can further be prevented. Since the glass substrate 2 of the present example has a linear expansion coefficient of 3.76 × 10 −6 mm / ° C., the pedestal 11 is composed of 42 alloy having a linear expansion coefficient of 4.5 × 10 −6 mm / ° C. good. In the present embodiment, the glass substrate 2 is taken as an example as the second electrode substrate constituting the liquid crystal display panel. However, when the glass substrate 2 is composed of another member, the material used for the base 11 in accordance with the linear expansion coefficient of the member. Should be selected. Further, as the conductive resin 13 that fills the through hole 12 of the pedestal 11, it is possible to reduce thermal stress of the conductive resin 7 by using, for example, a conductive resin having excellent flexibility.

DESCRIPTION OF SYMBOLS 1 Silicon substrate 2 Glass substrate 3 Circuit board 4 Electrode pad 5 Wire 6 Counter electrode 7 Conductive resin 8 Electrode pad 10 Base 11 Base with through-hole 12 Through-hole 13 Conductive resin

Claims (1)

A first electrode substrate having a plurality of pixel electrodes and a second electrode substrate having a counter electrode facing the first electrode substrate, wherein the first electrode substrate and the second electrode substrate are bonded together at a predetermined position and interval. A liquid crystal display element having a liquid crystal display panel, wherein the counter electrode of the second electrode substrate and the electrode pad provided on the opposing surface of the circuit board are electrically connected via a conductive resin, ,
Wherein said applying a conductive resin and the second electrode substrate opposite electrode between the electrode pads of the circuit board, by interposing a conductive base seat having a through hole,
The through holes of said conductive base, a conductive resin having flexibility to relieve thermal stress of the conductive resin, the upper surface thereof is filled to be lower than the upper surface of said conductive base and filling the Forming a space surrounded by the side surface of the through hole of the conductive base on the upper surface of the conductive resin;
The liquid crystal display element , wherein the space is filled with one end of the conductive resin that electrically connects the counter electrode of the second electrode substrate and the electrode pad of the circuit board .

Images