JP2002148653A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal device small in size and high in portability by almost eliminating a gap between a display panel and a circuit board of the liquid crystal device, and almost eliminating the gap accumulated as the liquid crystal device. SOLUTION: In the liquid crystal device 1, a PCB 3 which is a circuit board having a planar outside dimension nearly as same as the planar outside dimension of the liquid crystal panel 2 is disposed below the liquid crystal panel 2 via an adhesive material 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable device, a monitor such as a personal computer or a video camera, a game machine, and a display device used for a device such as a pachinko machine. A display panel generally has, for example, a display device incorporated in a portable device, and examples of the display device include a liquid crystal display device and an EL device that are actively used in recent years. Hereinafter, a case where a liquid crystal display device is used will be described in this specification.

[0002]

2. Description of the Related Art The above liquid crystal display device uses a liquid crystal panel using a liquid crystal member as an electro-optical conversion member. The size of a portable device as a display device using this liquid crystal panel is decreasing year by year from a notebook size (for example, a notebook computer) to a pocket size (for example, a PDA, a portable information device). Regarding the size reduction of such portable information input devices, each company is competing for its development. For example, even if the down amount is several millimeters or several grams, the effect is a great commercial value in portability. Contents disclosed in a patent application (Japanese Patent Application No. 2000-24598) previously filed by the present applicant for a configuration of a liquid crystal device which is a general liquid crystal display device which is a portable information input device using a conventional liquid crystal panel. This will be described below with reference to FIG.

A conventional liquid crystal device will be described with reference to FIG. 8 which is an external view of a conventional liquid crystal device and FIG. 9 which is a partial sectional view showing the inside of the conventional liquid crystal device. Windows (101) are provided in an upper case body (101) and a lower case body (102) forming a housing.
The display panel (103) is fixed facing a).
Although not shown, the display panel (103) is generally provided with electrodes perpendicular to the opposing surfaces of two substrates made of a transparent member. A reflecting member (108) is provided behind the display panel (103). Also,
A circuit board (109) is provided behind the reflecting member (108). The display panel (103) and the reflection member (10
8) and the circuit board (109) are laminated and provided with a gap therebetween.

Although not shown in the drawings, as another conventional example, a touch panel is stacked above a liquid crystal panel, housed in a frame, and fixed with a double-sided adhesive tape or the like. Further, a pin for supporting the substrate is stood downward from the upper case body, and a circuit board located below is fastened to the pin for supporting the substrate with a screw or the like.

[0005]

However, the above-mentioned conventional liquid crystal device has the following disadvantages. First, according to a conventional example disclosed in a patent application (Japanese Patent Application No. 2000-24598), a display panel (103) and a display panel (1) are disclosed.
There is a considerable gap between the reflecting member (108) and the reflecting member (108) disposed behind the reflecting member (03). Similarly, the circuit board (109) behind the reflecting member (108) has gaps larger than the above-mentioned gaps, and these gaps are accumulated to increase the vertical thickness of the liquid crystal device. . Therefore, the portability as a portable device in which the liquid crystal device is finally formed has been significantly impaired.

In the case of another conventional example, a plurality of pins are protruded from the bottom of the frame body and fastened by screws or the like, so that the thickness of the pins in the vertical direction is increased. These drawbacks significantly impair the portability of the final device as described above. In addition, the number of man-hours required for assembling the liquid crystal device is increased, and as a result, the cost of the product is increased.

[0007] It is an object of the present invention to provide a liquid crystal device having a reduced size and improved portability.

Another object of the present invention is to provide a liquid crystal device in which the weight of the device is reduced, the size of the device is reduced, the portability is improved, and the number of steps for assembling the liquid crystal device is reduced to reduce the cost. The purpose is to provide at a low price.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a first substrate having at least an electrode and a second substrate.
In a display device having at least a liquid crystal panel having a liquid crystal panel sealed with liquid crystal in the gap and a circuit board, the two substrates formed of a substrate and a substrate are disposed with a gap therebetween so that the electrodes face each other. The circuit board is provided near the liquid crystal panel.

The distance between the liquid crystal panel and the circuit board is close to or less than the thickness of the first substrate.

Further, the planar outer dimensions of the circuit board and the planar outer dimensions of the second substrate are substantially the same.

[0012] Further, a gap of at least a thickness of the first substrate is provided at an overlap between the circuit substrate and the second substrate.

Further, a flexible printed wiring is provided in the gap.

Further, an integrated circuit is provided in the gap.

Further, an integrated circuit and a flexible printed wiring are disposed in the gap.

An adhesive is provided between the circuit board and the first substrate so as to face each other.

Further, the adhesive is at least one of an adhesive, a double-sided tape, an adhesive sheet, and an adhesive member in which an adhesive is provided on both end surfaces of a sponge substrate. I do.

Further, the flexible printed wiring is provided on the back surface of the circuit board.

Further, the flexible printed wiring is bent and disposed on the back surface of the circuit board, so that the flexible printed wiring is substantially accommodated in the plane dimensions of the circuit board.

Further, the circuit board at the position where the flexible printed wiring is wound around the circuit board has a cutout recessed substantially corresponding to a width dimension of the flexible printed wiring.

Further, a touch panel is provided above the display panel.

Further, a touch panel is provided above the display panel in close proximity thereto.

[0023] Further, the planar dimension of the touch panel is substantially the same as the planar dimension of the first substrate.

Further, the planar dimension of the touch panel is substantially the same as the planar dimension of the second substrate.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to FIGS. FIG. 1 is a plan view of an embodiment of a liquid crystal device as a display device according to the present invention, FIG. 2 is a perspective view of the same, FIG. 3 is an exploded perspective view of the same, and FIG. FIG. 5 is an enlarged cross-sectional view taken along a line BB of FIG. 1, and FIG. 6 is a partially cutaway enlarged cross-sectional view taken along the line BB of FIG. 1. FIG. 7 is a schematic perspective view of a liquid crystal device provided with the printed wiring board and the touch panel of FIG. 6.

The liquid crystal device 1 according to the present invention shown in FIG.
As shown in FIG. 2, a control printed circuit board 3 (hereinafter, referred to as a PCB), which is a circuit board, is generally provided below the liquid crystal panel 2. Also, the liquid crystal panel 2 and P
CB3 is a flexible printed circuit board 4 (hereinafter, referred to as a flexible printed circuit board 4).
(Referred to as FPC).

In the liquid crystal panel 2 described above, a color filter (not shown) is provided on a facing surface 5A of a first substrate 5 made of a transparent material such as glass or plastic, as shown in FIGS. After coating the film (not shown), the transparent electrodes (not shown) are disposed in a stripe shape, and the alignment film (not shown) is disposed on the transparent electrodes (not shown) so as to cover them. Have been. Further, on the back surface of the first substrate 5, a reflecting portion 5B is formed by vapor deposition or a reflecting member such as a reflecting sheet.

A transparent electrode (not shown) is provided on the opposing surface 6B of the second substrate 6 located above the first substrate 5 in the same manner as the first substrate 5. ) Is arranged in a stripe shape so as to be orthogonal to the plan view. Further, an alignment film (not shown) is provided on the transparent electrode (not shown).
Are arranged so as to cover.

Further, a sealing material 8 which is a sealing portion containing a conductive adhesive mainly composed of an epoxy resin having a rectangular frame shape is provided in a gap between the first substrate 5 and the second substrate 6, and is heated. Laminated by curing. Then, liquid crystal 20, which is an electro-optical conversion member, is injected from a sealing opening (not shown) into an inner space of a sealing material 8 formed by laminating the first substrate 5 and the second substrate 6.

A polarizing plate 9 is provided on the upper surface 6A of the second substrate 6. Further, near the two sides adjacent to each other on the facing surface 6B, driving IC chips 7A and 7
B are mounted by a COG (chip-on-glass) method. Below the liquid crystal panel 2 configured as described above, a PCB 3 which is a circuit board having a plane external dimension substantially the same as the liquid crystal panel 2 is disposed close to the liquid crystal panel 2. Then, the liquid crystal panel 2 and the PC are connected via the adhesive 11.
B3 is adhered.

The above-mentioned adhesive material 11 may be at least one of an adhesive, a double-sided pressure-sensitive adhesive tape, an adhesive sheet, and an adhesive member in which an adhesive is provided on both end surfaces of a sponge substrate. In any case, it is preferable that the close distance between the liquid crystal panel 2 and the PCB 3 is equal to or less than the thickness of the first substrate 5.

Next, the liquid crystal panel 2 and the PCB 3 are electrically connected by the FPC 4 as shown in FIGS. The FPC 4 is disposed near the IC chips 7A and 7B previously disposed on the opposing surface 6B of the second substrate 6, and then is bent and disposed on the back surface of the PCB 3. further,
Since the FPC 4 is attached so as to wrap the FPC 4 on the upper surface 6A of the second substrate 6 at a position where the FPC 4 is provided, the FPC 4 can be attached almost entirely from the end face of the liquid crystal panel 2 in plan view. It does not protrude.

Further, as shown in FIGS. 4 and 5, another purpose of the protection sheets 10A and 10B of the second substrate 6 is as follows.
The purpose of the present invention is to prevent peeling of the adhesive between the substrate and the liquid crystal panel 2. The FPC 4 disposed on the second substrate 6 near the IC chips 7A and 7B is applied from the end surface of the polarizing plate 9 to the end surface of the second substrate 6 to prevent the deterioration of the electrodes due to dust, water droplets, electrolytic corrosion and the like. Therefore, a silicon material 14 is applied.

As another embodiment, as shown in FIG. 6, the PCB 13 which is a printed circuit board of the liquid crystal device 1 is provided with an FPC 4 at a position where the FPC 4 for winding the PCB 13 is disposed.
The notches 13A and 13B may be recessed in accordance with the width dimension of No. 4. In this case, the FPC 4 does not protrude outside the planar outer dimensions of the PCB 13. Therefore, the planar outer dimensions of the liquid crystal panel 12 are the planar outer dimensions of the liquid crystal device 1 as shown in FIG.

In the liquid crystal device 1 described above, a touch panel 19 is provided on the polarizing plate 9 provided on the liquid crystal panel 2 and further above as shown in FIG. The touch panel 19 is attached to and fixed to a housing (not shown) in which the liquid crystal device 1 is stored and fixed, and a cushioning material or the like is provided above the second substrate 6 and above the polarizing plate 9 or the touch panel 19. And can be arranged so as to be close to the housing via.

As shown in FIG. 7, the planar outer dimensions of the fixed display portion 19B of the touch panel 19 provided in the liquid crystal device 1 are substantially the same as the planar outer dimensions of the second substrate 6. The fixed display section 19B of the touch panel 19 is IC
By arranging above the chip 7A, further miniaturization can be obtained.

The present invention is not limited to the above-described embodiment, and it goes without saying that various changes and improvements can be made without departing from the scope of the present invention. For example, this embodiment is a passive matrix liquid crystal display device, but may be an active matrix liquid crystal display device or a liquid crystal device using a black matrix or the like. Further, in the present invention, the embodiment in which the circuit board is made substantially the same as the display panel is shown. However, in terms of thinning, the effect of making the circuit board not necessarily the same size as the display panel can be obtained. For example, it is possible to make the circuit board smaller than the size of the display panel, and to provide another member at a place where the circuit board is not provided. Conversely, make the circuit board larger than the size of the display panel,
It is possible to provide a mounting portion for supporting the circuit board and the display panel by using a portion of the circuit board on which the display panel is not provided.

[0038]

According to the present invention described above, the liquid crystal device is thinned because the PCB disposed below the liquid crystal panel is laminated and disposed in three layers in an up-down direction with an adhesive material without any gap. Along with this, the strength against cracking increased.

Further, according to the present invention, since the liquid crystal device has substantially the same planar outer dimensions as the liquid crystal panel and the PCB disposed below, the FPC is bent like a PCB so as to wrap the end surface of the PCB. The FPC does not protrude outside at all by arranging it on the back surface of the PCB or recessing the notch in accordance with the width dimension of the FPC like the PCB, so that the planar external dimensions of the liquid crystal panel are substantially The size of the liquid crystal device can be reduced because of the planar external dimensions described above. Therefore, portability has been greatly improved in addition to the above-mentioned effect of thinning.

Further, according to the present invention, the liquid crystal device uses an adhesive in the assembling work of the liquid crystal panel and the PCB disposed below, so that not only the case body is unnecessary but also the fastening of screws and the like is not necessary. There is an effect that the work is eliminated, the man-hour is reduced, and the cost of the product is reduced.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a liquid crystal device according to the present invention.

FIG. 2 is a schematic perspective view of a liquid crystal device according to the present invention.

FIG. 3 is a schematic exploded perspective view of the liquid crystal device according to the present invention.

FIG. 4 is an enlarged cross-sectional view of the liquid crystal device according to the present invention, which is partially omitted along the line AA in FIG. 1;

FIG. 5 is an enlarged cross-sectional view of the liquid crystal device according to the present invention, which is partially omitted along the line BB in FIG. 1;

FIG. 6 is a perspective view showing a printed wiring board provided with a cutout of the liquid crystal device according to the present invention.

7 is a schematic perspective view of the liquid crystal device according to the present invention in which the printed wiring board of FIG. 6 and a large touch panel are provided.

FIG. 8 is an external perspective view of a portable device showing a conventional technique.

FIG. 9 is an external perspective view of a portable device showing a conventional technique.
FIG. 9 is a partial sectional view showing the inside of FIG. 8.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 liquid crystal device 2, 12 liquid crystal panel 3, 13 printed circuit board (PCB) 4 flexible printed circuit board (FPC) 5 first substrate 5A opposing surface 5B reflecting surface 6 second substrate 6A opposing surface 6B bottom surface 7A, 7B IC chip 8 Sealing material 9 Polarizing plate 10A, 10B Protective sheet 11 Adhesive material 13A, 13B Cutout portion 14 Silicon material 19 Touch panel 19A Effective display portion 19B Fixed display portion 20 Liquid crystal

Claims (18)

[Claims] A first substrate having at least an electrode; and a second substrate having at least an electrode.
A display device having at least a display panel and a circuit board in which two substrates each including a substrate are arranged with a gap with electrodes facing each other, and the gap is sealed with an electro-optical conversion member; The display device, wherein the circuit board is provided below and close to the display panel. 2. The display device according to claim 1, wherein an interval between the display panel and the circuit board is close to or less than a thickness of the first substrate. 3. The circuit board according to claim 2, wherein said circuit board has a planar outer dimension and said second external dimension.
2. The display device according to claim 1, wherein the planar outer dimensions of the substrate are substantially the same. 4. The display device according to claim 1, wherein a gap of at least a thickness of the first substrate is provided at an overlap between the circuit substrate and the second substrate. 5. The display device according to claim 4, wherein a flexible printed wiring is provided in the gap. 6. The display device according to claim 4, wherein an integrated circuit is provided in the gap. 7. The display device according to claim 4, wherein an integrated circuit and a flexible printed wiring are provided in the gap. 8. The display device according to claim 1, wherein an adhesive is provided between the circuit board and the first substrate facing each other. 9. The method according to claim 8, wherein the adhesive is at least one of an adhesive, a double-sided tape, an adhesive sheet, and an adhesive member in which the adhesive is provided on both end surfaces of a sponge substrate. The display device according to claim 8, wherein 10. The display device according to claim 5, wherein the flexible printed wiring is provided on a back surface of the circuit board. 11. The circuit board according to claim 5, wherein the flexible printed wiring is bent and disposed on the back surface of the circuit board so as to be substantially accommodated in a plane dimension of the circuit board. The display device according to claim 10. 12. The circuit board according to claim 11, wherein the circuit board at a position where the flexible printed circuit is wound around the circuit board has a cutout recessed substantially corresponding to a width dimension of the flexible printed circuit. Display device. 13. The display device according to claim 1, wherein a touch panel is provided above the display panel. 14. The display device according to claim 1, wherein a touch panel is disposed close to and above the display panel. 15. The display device according to claim 1, wherein a planar dimension of the touch panel is substantially the same as a planar dimension of the first substrate. 16. The display device according to claim 1, wherein a planar dimension of the touch panel is substantially equal to a planar dimension of the second substrate. 17. A display panel in which at least two substrates each including a first substrate and a second substrate having electrodes are arranged with a gap therebetween with electrodes facing each other, and an electro-optical conversion member is sealed in the gap. A display device having at least a circuit board and a circuit board, wherein the circuit board is disposed below the display panel and close to the display panel, and the circuit board and the display panel are bonded with an adhesive. A display device characterized by the above-mentioned. 18. The display device according to claim 1, wherein the adhesive for bonding the circuit board and the display panel is bonded using at least one of a double-sided adhesive tape, an epoxy adhesive, and a silicon adhesive.