JPS61267085A - liquid crystal display device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device in which a liquid crystal cell using a flexible film as a substrate and a transparent touch sensor panel are combined and mounted.

Liquid crystal cells using flexible plastic films as substrates for forming transparent electrodes are attracting attention because they have excellent properties such as being lightweight and thin.

On the other hand, a transparent touch sensor panel is known as an input device used by being placed on a liquid crystal display cell. In a touch sensor panel, for example, a substrate having striped electrodes in the X-axis direction and a substrate having striped electrodes in the Y-axis direction are arranged so as to prevent short-circuiting due to a slight air gap to form an electrode pattern in a matrix. By applying pressure with a finger or the like, the electrodes come into contact with each other and an input is made to the control circuit.

Conventionally, a combination of a liquid crystal display cell using a glass substrate and a transparent touch sensor panel is known. But how to implement in this case.

Even if it is applied directly to a combination of a flexible film substrate liquid crystal cell and a touch sensor panel, the excellent characteristics of the flexible film substrate liquid crystal cell, such as thinness and light weight, cannot be fully utilized.For example, In conventional mounting methods that use anisotropic conductive connectors such as ZebraCont, which do not have the function of bonding the liquid crystal cell and printed circuit board, connections and fixations are made by pressing the connector with metal fasteners, etc. However, this metal fitting is heavy and large, making it impossible to achieve a thin and lightweight mounting.

11■l Friend The liquid crystal display device of the present invention is a liquid crystal display device in which a transparent touch sensor panel is disposed on a liquid crystal display cell using a flexible film as a substrate and mounted on a circuit board. The electrode extension part of the touch sensor panel and the external electrode part of the circuit board are connected by a film-like connector having anisotropic conductivity, and the electrode extension part and the external electrode part are electrically connected and the transparent It is characterized by a touch sensor panel fixed to a circuit board.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1 is an exploded perspective view showing an embodiment of the present invention. On the printed circuit board 11, a reflective polarizing plate 31, a liquid crystal cell 39, a polarizing plate 71, and a transparent touch sensor panel 8 are sequentially arranged.
1 is arranged. The liquid crystal cell 39 is divided into two parts, and a first signal line electrode extraction part 43 and a second signal line electrode extraction part 49 are formed on the back surface of the protruding parts 41 and 47 from the display surface of the upper substrate 35, respectively. ing. Further, a scanning line electrode extraction portion 55 is formed on the surface of the protruding portion 53 from the display surface of the lower substrate 37. The signal line external electrode section 15.19 of the printed circuit board 11 and the first signal line electrode extraction section 43 and second signal line electrode extraction section 49 of the liquid crystal cell 39 are aligned and are heat-sealed. They are connected by conductive film connectors 25 and 27.

Further, the scanning line external electrode portion 21 of the printed circuit board 11
and the scanning line electrode extraction portion 55 of the liquid crystal cell 39 are connected by a heat seal type anisotropic conductive film connector 29.61.
They are aligned and connected via a flexible printed circuit board 63 having conductive paths 65 with the same pitch width as the scanning lines.

In the transparent touch sensor panel 81, a lower substrate 85 having an electrode in the X-axis direction and an upper substrate 85 having an electrode in the Y-axis direction are arranged with an air gap. The upper and lower substrates are formed from flexible films such as plastic films. A Y-axis direction electrode extension portion 105 is formed on the back surface of the protruding portion 103 of the upper substrate 83 of the transparent touch sensor panel 81 . In addition, the protruding portion 1 of the lower substrate 85
An X-axis direction electrode extraction portion 109 is formed on the surface of 07. External electrode part 1 for Y-axis direction of printed circuit board 11
6 and the Y-axis direction electrode extension portion 105 of the transparent touch sensor panel 81 are aligned and connected by a heat seal type anisotropic conductive film connector 72. In addition, the external electrode section 20 for the X-axis direction of the printed circuit board 11
and the X-axis direction electrode extension portion 109 of the transparent touch sensor panel 81.

A flexible printed circuit board 73 that is aligned and has conductive paths 75 with the same pitch width as the X-axis direction electrodes 108
are connected by anisotropically conductive film connectors 77 and 79.

FIG. 2 shows the coupling state between the second signal line electrode section 49 and the signal line external electrode 19, and the Y-axis direction electrode extraction section 105 and the Y-axis direction electrode extraction section 105.
3 is a partial sectional view of the vicinity of the external electrode portion 19.16 to show the state of connection with the axial external electrode portion 16, and FIG. 3 is a sectional view taken along the line ■-■ in FIG. 2. . A heat-sealed anisotropic conductive film connector 27 is placed on the signal line external electrode part 19, and the signal line external electrode 17 and the signal line electrode 51 are aligned and the protruding part 47 is placed on top of this to generate heat from above. By pressing with the body, the signal line electrode extraction portion 49 of the liquid crystal cell 39 is fixed to the printed circuit board 11. In addition, a heat seal type anisotropic conductive film connector 72 is placed on the Y-axis direction external electrode section 16, and the Y-axis direction
By aligning the axial direction extraction electrode 106 and the Y-axis direction external electrode 18, placing the Y-axis direction electrode extraction part 105, and pressing with a heating element from above, the Y-axis direction electrode extraction of the transparent touch sensor panel 81 is performed. portion 105 is fixed to printed circuit board 11 . At this time, the external electrode 1 for the Y-axis direction
In the part corresponding to 8, the anisotropic conductive film connector 7
2 are pressed together thinner to obtain an electrical connection. Further, the same thing occurs in the portion corresponding to the signal line external electrode 17, and the anisotropically conductive film connector 37 is pressed into a thinner layer.

Electrical connection is obtained between the signal line type M51 and the signal line external electrode 17. The heat-sealed anisotropically conductive film connector 27 is a film in which conductor particles are dispersed, and the thinly pressed part has higher conductivity than other parts, exhibiting anisotropic conductivity. Since the anisotropic conductive film can be made thinner than members such as the substrate and reflective polarizing plate, thin mounting is possible.

Moreover, this film allows conduction and at the same time fixing the transparent touch sensor panel 81 to the printed circuit board 11, which simplifies the mounting work.

The same can be said about the liquid crystal cell 39. Transparent touch sensor panels and liquid crystal cells made of plastic film are lightweight, so they can be adequately fixed with heat sheet film.

FIG. 4 shows the coupling state between the scanning line electrode extraction section 55 and the scanning line external electrode section 23, and the X-axis direction electrode extraction section 109 and the X-axis direction electrode extraction section 109.
5 is a partial cross-sectional view of the vicinity of the external electrode portion for schematically showing the state of connection with the axial external electrode portion 20, and FIG. 5 is a cross-sectional view taken along the line ■-■. Since both the scanning line electrode 57 and the scanning line external electrode 21 face upward, it is not possible to connect them directly. Therefore, the scanning line electrode 5
They are connected via a flexible printed circuit board 63 having a conductive path 65 having the same pitch width as 7. Similarly, the X-axis direction extraction electrode 10g and the X-axis direction external electrode 22
and are both facing the top surface, so the X-axis direction extraction electrode 10
The anisotropic conductive film connector 7
7, 79. Coupling of the flexible printed circuit board 73 and the X-axis direction extraction electrode section 109, coupling of the flexible printed circuit board 73 and the X-axis direction external electrode section 20, coupling of the flexible printed circuit board 63 and the scanning line electrode extraction section 55, and flexible printing. Board 63
The coupling between the scanning line external electrode section 23 and the scanning line external electrode section 23 is the same as that described in FIGS. 2 and 3. Here again, the anisotropic conductive film connector serves both to electrically connect the transparent touch sensor panel 81 and the printed circuit board 11 and to fix the transparent touch sensor panel 81 to the printed circuit board 11. . This means that liquid crystal cell 39
The same applies to Due to the thickness of the substrate, polarizing plate, etc., there is a difference in height between the scanning line external electrode section 23 surface of the printed circuit board 11 and the scanning line electrode extraction section 55 surface of the liquid crystal cell 39, but flexible printing By using the substrate 63, the two can be reliably connected despite the difference in height.

FIG. 6 is an exploded perspective view showing another embodiment of the present invention, which is similar to FIG. 1 except that a protection plate 121 is provided between the liquid crystal cell 39 and the transparent touch sensor panel 81. Same as shown.

In the embodiment shown in FIG. 1, there is no polarizing plate 31 between the transparent touch sensor panel 81 and the liquid crystal cell 39. Since the polarizing plate is usually made of a flexible material, the transparent touch sensor panel 81 can be touched with a finger. When pressed, LCD cell 3
9 may be subjected to local pressure, which may damage the alignment film or cause gap defects in the liquid crystal cell, which may impair display quality. In the embodiment shown in FIG. 6, since the protective plates 121 are spaced apart from each other with a gap, pressure can be prevented from being applied locally to the liquid crystal cell. As the protection plate, a rigid plate such as an acrylic plate is suitable. The protective plate can be fixed by suitable means such as adhesive. The protective plate is polarizing plate 7
Alternatively, the polarizing plate 71 may be omitted by using a protective plate having the function of a polarizing plate.

Furthermore, the protection plate can also be used as the lower substrate of the transparent touch sensor panel 81. In other words, a substrate having the function of a protection plate as described above may be used as the lower substrate of the transparent touch sensor panel.

FIG. 7 shows another embodiment of the invention. In this example,
A notch (gap) 123 is provided at the side edge of the protection plate corresponding to the Y-axis direction external electrode section 16 of the printed circuit board 11. The Y-axis direction external electrode 16 of the printed circuit board 11 and the Y-axis direction electrode extension part 103 of the transparent touch sensor panel are a wound flexible printed circuit board having conduction paths 133 having the same pitch width as the electrode extension part 103. 131. The flexible printed circuit board 131 and the Y-axis direction electrode lead-out section 105 or the Y-axis direction external electrode section 16 are connected by an anisotropic conductive film connector 137.72. According to this embodiment, the protrusion 10 of the transparent touch sensor panel 81
3 can be coupled to the printed circuit board 11 without bending downward, so the transparent touch sensor panel 81 can be mounted without being bent under the influence of the relatively thick protective cover 121.

According to the present invention, a transparent touch sensor panel is integrated with a flexible film substrate liquid crystal cell using a film-like connector having anisotropic conductivity, thereby making it thin and inexpensive by a simple method. Can be conductive and fixed.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention. Second
The figure is a partial cross-sectional view showing the vicinity of the Y-axis direction electrode lead-out portion, and FIG. 3 is a partial cross-sectional view taken along the line ■-■. Figure 4 is X
It is a partial cross-sectional view showing the vicinity of the axial electrode pulling part, and FIG. 5 is a partial cross-sectional view taken along the line ■-■. FIGS. 6 and 7 are exploded perspective views showing other embodiments of the present invention. 11...Printed circuit board 13.17...External electrode for signal line 15.19...External electrode part for signal line 16...External electrode for Y-axis direction 20...XIII & External II for direction! Pole 21... External electrode for scanning line 23... External electrode part for scanning line 25.27, 29, 61, 72, 77.79... Anisotropic conductive film connector, Ri 31... Reflective polarized light Board 35... Upper board 37...
・Lower substrate 39...Liquid crystal cell 41.47...
-Protrusion part 43 of upper substrate...First signal line electrode extraction part 49...Second signal line electrode extraction part 51...Signal line electrode 53...Protrusion part 55 of lower substrate... Scanning line electrode extraction part 57...Scanning line electrode 6
3.73,131...Flexible printed circuit board 65
．． 75,135... Conduction path 71... Polarizing plate 81
...Transparent touch sensor panel 105...Y-axis direction electrode extension part 106...Y-axis direction extension electrode 10g...X1m direction extension electrode 109...X-axis direction electrode extension part 121...Protection plate Class 2 Figure” 7f! Figure 55 tj

Claims (1)

[Claims] 1. A liquid crystal display device in which a transparent touch sensor panel is disposed on a liquid crystal display cell using a flexible film as a substrate and mounted on a circuit board, the electrode lead-out portion of the transparent touch sensor panel and the circuit board. The transparent touch sensor panel is connected to the external electrode portion of the panel using a film-like connector having anisotropic conductivity, the electrode lead portion and the external electrode portion are electrically connected, and the transparent touch sensor panel is fixed to the circuit board. Characteristic liquid crystal display device.