JPH063687A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To construct a liquid crystal display device thin and light by incorporating such a mechanism as to hold down with a metal frame. CONSTITUTION:A metal frame A1 is subjected to burring and tapping to prepare in advance a thread groove. Another metal frame B2 is provided with a hole greater in dia than the outside dia. of screw, i.e., 3.0mm for a screw of M2.6. An M2.6 screw is inserted through the metal frame B2 to fasten to the frame A1. A cushion material 8 is located between OL-II and metal frame A1 while another piece of cushion material 8 is provided between the OL-II and metal frame B2 so as to absorb the thickness tolerance of the liquid crystal panel and metal frames and the position tolerance of the screw fastened part. The total thickness of the liquid crystal device becomes 6.8mm maximum. The metal frames A1, B2 are preferably to be made from a material having a high tensile strength, high yield point, and high hardness.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a liquid crystal display device and materials of structural parts.

[0002]

2. Description of the Related Art A conventional liquid crystal display device will be described with reference to FIGS. FIG. 8 is a plan view of a conventional liquid crystal display device, and FIG.
FIG. 4 is a sectional view of a portion showing the most characteristic feature of the conventional liquid crystal display device.

The liquid crystal panel 9 is a TAB (TAPE AUTOMATED BO) mounted with a liquid crystal driving driver.
(NDING) by an anisotropic conductive film, or a substrate unit in which a resin-molded liquid crystal driving driver is mounted on the substrate by a soldering technique is connected to the liquid crystal panel by heat sealing. Hereinafter, such a state is defined as an OL-II state. Conventionally, the OL-
II state and backlight 17, plastic case 1
The liquid crystal display device was configured by sandwiching the liquid crystal display device 8 and the metal frame 16 between them. When the display section is in the reflection mode, a plastic case is provided on the back side, and the OL-II is incorporated into the plastic case and fixed by caulking with a metal frame from the opposite side, or a plastic material similar to the plastic case. The method of applying the plate and fixing it with screws was adopted.

[0004]

However, in the liquid crystal display device according to the above-mentioned prior art, the thickness of the display device is 9.5 mmMAX for the built-in backlight type and about 8.0 mmMAX for the reflection mode type, which is great for miniaturization of personal computers. It is an obstacle. Since the outer shape of the product is A4 file size or less, the thickness required for the liquid crystal display device is about 7.5 mmMAX for the built-in backlight type and about 6.0 mmMAX for the reflection mode type.

The weight of the display device is required to be 600 g or less in order to improve portability. Therefore, in order to solve the above drawbacks, the present invention employs a metal frame for OL-I.
By fixing I, the liquid crystal display device is made thinner and lighter.

An object of the invention is to provide a liquid crystal display device used for a personal computer or the like having excellent portability.

[0007]

A liquid crystal display device of the present invention is a TAB (TA) mounted with a liquid crystal panel and a driver.
A liquid crystal display device composed of PE AUTOMATED BONDING is characterized by a structure in which a metal frame holds the liquid crystal display device.

[0008]

【Example】

(Embodiment 1) Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. 1 is a plan view of a first embodiment of the present invention, and FIG. 2 is a cross-sectional view of a main part showing the most characteristic feature of the first embodiment of the present invention.

Reference numerals are metal frame A1, metal frame B2, screw 3, liquid crystal driving driver 4, TA
B (TAPE AUTOMATED BONDING)
5, the substrate 10, the double-sided adhesive tape 6 for fixing the substrate, the screw side surface 7, the cushion material 8, and the liquid crystal panel 9 are shown.

The metal frame A1 in the first embodiment is
Burring is performed and taps are raised to engrave the groove of the screw in advance. Further, with respect to the metal frame A1, the metal frame B2 has a hole larger than the diameter of the screw, that is, in the present embodiment, specifically, a diameter of 3.0 mm for the M2.6 screw.
There is a punch hole. The structure is such that the M2.6 screw 3 is passed through the metal frame B2 and tightened with the metal frame A1. The cushion material 8 is between the OL-II and the metal frame A1, and the other cushion material 8 is O.
It is provided between L-II and the metal frame B2 to absorb the thickness tolerance of the liquid crystal panel and the metal frame and the positional tolerance of the screw tightened portion. When this structure is adopted, the total thickness of the liquid crystal display device can be 6.8 mmMAX.

Further, the metal frame A1 in this structure,
The material of the metal frame B2 is preferably a material having high tensile strength and high yield point, and a hard material (MBS <500). Specifically, stainless steel materials SUS-304, SUS-40
3, cold rolled steel plate SPCC-SD, plated steel plate E
Examples thereof include GC-E, EGC-CF, and EGC-EJ.
The cushion material is preferably silicone rubber and has a hardness of J
From IS-A20, a good screw tightening condition was obtained at 70th position.

The weight of the liquid crystal display device having this structure is 340.
Thus, it was confirmed that the structure was sufficient to satisfy general reliability such as vibration impact (for example, 100 G impact test).

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG.
Will be explained. Reference numerals indicate the metal frame A1, the metal frame B2, the OL-II, and the screw 3. In this example,
Compared with the above-mentioned Example 1, the OL-II state shows the case where the TAB is opened horizontally without bending. Also in this case, the materials and structures of the metal frame and the cushion material are the same as those in the first embodiment. The total thickness of the liquid crystal display device having this structure can be further set to 6.0 mmMAX.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIG.
Will be explained. This embodiment is different from Embodiments 1 and 2 in that
Instead of the TAB 5, a heat seal 11, a liquid crystal driving driver 12 in the form of a chip, and a gold-plated substrate 6 are used. Chip-type LCD driver 1
2 can be mounted on the substrate 6 by the COB (CHIP ON BOAD) technique and handled as a substrate unit. Also in this case, the materials and structures of the metal frame and the cushion material are the same as those in the first embodiment. The total thickness of the liquid crystal display device having this structure could be 6.8 mmMAX.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described with reference to FIG.
Will be explained. This embodiment is different from Embodiments 1 and 2 in that
Instead of the TAB 5, a heat seal 11, a resin-molded driver 13 for driving a liquid crystal, and a substrate 6 plated with gold flash are used. The resin-molded driver 13 for driving the liquid crystal can be mounted on the substrate 6 by a soldering technique such as reflow and can be handled as a substrate unit. Also in this case, the materials and structures of the metal frame and the cushion material are the same as those in the first embodiment. The total thickness of the liquid crystal display device having this structure could be 7.0 mmMAX.

(Fifth Embodiment) Next, a fifth embodiment of the present invention will be described with reference to FIG.
Will be explained. Metal frame A1 and metal frame B
2, the screw side surface 7, and the hexagon nut 14 are shown. In contrast to the structure described in the first embodiment, the present embodiment eliminates the need for burring the metal frame A1 and providing the screw groove by using the hexagon nut. As a result, the metal frame A
The machining of No. 1 was simplified and the cost was reduced to 128 yen, and the dimensional accuracy was improved, especially the positional accuracy in the thickness direction was improved.

Of course, in addition to hexagon nuts, square nuts, butterfly nuts, hexagon cap nuts, hexagon weld nuts, T-type weld nuts, square weld nuts, hexagon nuts with flanges, plate nuts, idling, nylon nuts, flange nuts with select. , Spring nut, spring plate nut, speed nut,
It goes without saying that the same effect can be obtained by using a push nut, a flat push nut, a CS type retaining ring, a snap pin, a daruma pin, and a knocking lippet.

(Sixth Embodiment) Next, a sixth embodiment of the present invention will be described with reference to FIG.
Will be explained. Metal frame A1 and metal frame B
2 shows the screw side surface 7. In this embodiment, the metal frame A1
The portion to be screwed is subjected to a bending work as shown by a bending work portion 15 of the metal case. As a result, the strength was increased, and it was confirmed that the present structure sufficiently satisfies the reliability even with an inexpensive material, while the preferable materials are limited as described in the first embodiment. Furthermore, the strength could be further increased by performing the bending process twice or more.

[0019]

As described above, according to the present invention, the total thickness of the liquid crystal display device can be reduced by about 1.5 to 2.0 mm as compared with the conventional structure. Furthermore, due to the reduction in the number of parts, the total weight could be reduced from 15% to 20% even though the metal frame was used. Since the structure is simple, it is possible to reduce the number of steps in the process of assembling the liquid crystal display device, and it is also possible to easily perform rework even when a malfunction such as a function occurs. Also, it has been confirmed that the structure is superior to the conventional structure in terms of reliability against vibration and impact. In addition, since the metal frame is conductive, it is also advantageous for the EMI standard and measures against static electricity. Furthermore, the number of parts has been reduced, resulting in a significant cost reduction. As described above, the present invention not only reduces the total thickness of the liquid crystal display device, but also has various excellent effects.

[Brief description of drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing a first embodiment of the present invention.

FIG. 3 is a plan view showing a second embodiment of the present invention.

FIG. 4 is a plan view showing a third embodiment of the present invention.

FIG. 5 is a plan view showing Embodiment 4 of the present invention.

FIG. 6 is a plan view showing a fifth embodiment of the present invention.

FIG. 7 is a plan view showing a sixth embodiment of the present invention.

FIG. 8 is a plan view showing a conventional liquid crystal display device.

FIG. 9 is a sectional view showing a conventional liquid crystal display device.

[Explanation of symbols]

1. Metal frame A 2. Metal frame B 3. Screw 4. LCD driver 5. TAB (TAPE AUTOMATED BOND
ING) 6. Double-sided adhesive tape 7. Side of screw 8. Cushion material 9. Liquid crystal panel 10. Substrate 11. Heat seal 12. Driver for driving liquid crystal in chip form 13. 13. Driver for driving liquid crystal in resin mold form Hexagon nut 15. Bending point of metal case 16. Metal frame 17. Backlight 18. plastic case

Claims (3)

[Claims] 1. A TA mounted with a liquid crystal panel and a driver.
B (TAPE AUTOMATED BONDING)
In the liquid crystal display device constituted by, a liquid crystal display device characterized by a structure in which a metal frame holds the liquid crystal display device. 2. Instead of the TAB according to claim 1, a driver which is composed of a substrate unit mounted by a heat seal and a COB (CHIP ON BOAD) system, or which is supplied in the form of a heat seal and a resin mold package is provided. A liquid crystal display device comprising a mounted board unit and having a structure in which these components are held by a metal frame. 3. A liquid crystal display device according to claim 1 or 2, wherein the metal frame of the portion to be screwed is bent one or more times.