JPH0944096A - Electronic device with liquid crystal display panel - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent display unevenness of a liquid crystal display panel in an electronic device with a liquid crystal panel. A housing, a liquid crystal display panel installed on the front surface of the housing, a drive element housed inside the housing for driving the liquid crystal display panel, and installed between the liquid crystal display panel and the drive element. A heat dispersion plate that disperses the heat generated from the driving element is provided. The heat dispersion plate consists of a resin frame and a metal plate fitted into the frame, and the heat dispersion plate is attached to the housing via the frame. Is characterized by.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device with a liquid crystal display panel such as a personal computer or a word processor.

[0002]

2. Description of the Related Art In such a conventional electronic device,
A CRT has been mainly used as the display means, but recently, a liquid crystal display panel has been adopted as the display means to reduce its size.

[0003]

However, since the display characteristics of a liquid crystal display panel are easily affected by temperature, if the drive element is installed near the liquid crystal display panel, the liquid crystal display panel will be affected by the heat generated by the drive element. There is a problem in that display is unevenly generated due to partial heating.

The present invention has been made in view of the above circumstances, and a heat dispersion plate that disperses the heat generated from the driving element and radiates the heat to the liquid crystal display panel is provided between the driving element and the liquid crystal display panel. By doing so, it is possible to provide an electronic device with a liquid crystal display panel capable of preventing display unevenness of the liquid crystal display panel.

[0005]

The present invention provides a housing, a liquid crystal display panel installed on the front surface of the housing, a drive element housed inside the housing and driving the liquid crystal display panel, and a liquid crystal display panel. The heat dissipating plate is provided between the drive element and disperses heat generated from the drive element, and the heat dissipating plate is made of a resin frame and a metal plate fitted in the frame, and the heat dissipating plate forms the frame. The present invention provides an electronic device with a liquid crystal display panel, characterized in that the electronic device is attached to a housing via the electronic device.

As the liquid crystal display panel of the present invention, for example, TFT type, STN type and DSTN type can be used. The drive element for driving the liquid crystal display panel is an element that constitutes an electric circuit for giving a drive signal and a scanning signal to each pixel of the liquid crystal display panel, and is usually arranged on a printed board.

The heat dispersion plate is composed of a resin frame and a metal plate fitted into the frame, but the frame and the metal plate may be integrally formed by, for example, injection molding. It is preferable to use an aluminum plate as the metal plate in consideration of heat conductivity, weight and rigidity, but a copper plate, a magnesium alloy plate, an iron plate or a stainless steel plate may be used. Further, it is desirable that the shape is a flat plate shape because of easy processing.

The resin used for the resin frame is not particularly limited, but when molding the frame by injection molding, for example, PC-ABS resin or nylon-A is used.
BS resin, PBT-ABS resin, etc. are applicable,
It is desirable to use an amorphous thermoplastic resin that does not easily warp. The area and thickness of the metal plate are determined in consideration of the area of the liquid crystal display panel and the installation position of the driving element so that the heat generated from the driving element is uniformly dispersed. You can decide.

The heat dissipating plate is attached to the housing via the frame, but by using this as a core of the housing, the structural strength of the housing can be improved. In this case, a boss for fixing the liquid crystal display panel, the printed circuit board or the like, or a rib for reinforcing the heat dispersion plate may be integrally formed on the resin frame.

According to the present invention, the heat dispersion plate installed between the liquid crystal display panel and the driving element disperses the heat generated from the driving element and radiates the heat to the liquid crystal display panel. Display unevenness is prevented. Further, since the heat dispersion plate is attached to the housing via the resin frame and acts as a core of the housing, the structural strength of the housing is improved.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings. The present invention is not limited to this form. FIG. 1 is a perspective view showing a pen-input type notebook personal computer (hereinafter referred to as a notebook computer) showing this embodiment, and FIG. 2 is a block diagram showing its electric circuit.

A liquid crystal display unit 2 is provided on the front surface of the case of the notebook computer main body 1, and when data is input to the tablet 2a of the liquid crystal display unit using a pen 3, the input data is read from the CPU, ROM and RAM. Is input to the microcomputer 5 and processed, and the processed data is LC
The liquid crystal display panel 2b is displayed via the D drive element 4.

Electronic components such as the LCD driving element 4 and the microcomputer 5 are mounted on the printed circuit board 6. The external dimensions of this laptop are 250 x 1
It is 50 × 20 mm.

FIG. 3 is a cross-sectional view of the notebook computer shown in FIG. 1. The case is composed of an upper case 11 and a lower case 12, and a core 13 as a heat dispersion plate is provided in the case. The core 13 supports the tablet 2a and the liquid crystal display panel 2b on the upper side, and supports the printed circuit board 6 on the lower side.

FIG. 4 is a top view showing the core 13, and FIG.
FIG. 5 is a sectional view taken along the line AA of FIG. 4. In these figures,
The aluminum plate 14 is fitted into a resin frame 15, and the resin frame 15 has a rib 15a on the upper surface for supporting the tablet 2a and the liquid crystal display panel 2b, and a boss 15b for fixing the printed circuit board 6. Core 13
A locking piece 15c for locking itself to the inner wall of the housing is integrally provided.

When the core 13 is mounted inside the housing as shown in FIG. 3, the structural strength itself of the housing is increased. Moreover, when the notebook computer is driven, the heat generated from the electronic components such as the LCD drive element 4 on the printed circuit board 6 is once received by the aluminum plate 14, and the aluminum plate 14 absorbs the received heat by heat conduction. After being distributed in this manner, it is discharged to the liquid crystal display panel 2b.

Therefore, in the liquid crystal display panel 2b, display unevenness does not occur due to heat generation of electronic components on the printed circuit board 6.

Next, a method of manufacturing the core 13 will be described with reference to FIGS. 6 and 7. First, as shown in FIG.
A through hole 14a is formed in an aluminum plate 14 having a thickness of 1.0 mm and a size of 200 × 120 mm.

Next, a portion (hatched portion) 14b to be joined to the resin frame 15 on one surface of the aluminum plate 14b.
A heat-resistant rubber (nitrile rubber) -based adhesive is applied to the film by a screen printing method to a thickness of 20 μm.

Next, as shown in FIG. 7A, the aluminum plate 14 is mounted in the mold. Then, after the mold is clamped, as shown in FIG. 7B, ABS resin (Styrac VGB2, manufactured by Asahi Kasei Co., Ltd.) is injected into the mold through the resin injection hole 20.

At this time, the boss 15b is attached to the aluminum plate 14.
It is formed of a resin injected to the lower part of the aluminum plate 14a through the through hole 14a. Next, as shown in FIG. 7C, the mold is opened and the molded core 13 is taken out.

As a result, as shown in FIG. 5, the core 13 in which the aluminum plate 14 and the resin frame 15 are integrally joined is molded. The molding conditions are resin temperature 2
The temperature is 40 ° C., the injection pressure is 600 Kgf / cm ² , and the injection time is 1.5 seconds.

[0023]

According to the present invention, since the heat dispersion plate is provided between the liquid crystal display panel and its driving element, display unevenness due to heat of the liquid crystal display panel is prevented.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a block diagram showing an electric circuit according to an embodiment of the present invention.

FIG. 3 is a sectional view showing an embodiment of the present invention.

FIG. 4 is a top view showing a main part of the embodiment.

FIG. 5 is a sectional view taken along the line AA of FIG. 4;

FIG. 6 is a diagram showing a manufacturing process of a main part of the embodiment.

FIG. 7 is a diagram showing a manufacturing process of a main part of the embodiment.

[Explanation of symbols]

 1 Main Body 2 Liquid Crystal Display Section 3 Pen 4 LCD Driving Element 5 Microcomputer 6 Printed Circuit Board 2a Tablet 2b Liquid Crystal Display Panel 11 Upper Case 12 Lower Case 13 Core 14 Aluminum Plate 15 Resin Frame

Claims (1)

[Claims] 1. A housing, a liquid crystal display panel installed on the front surface of the housing, a drive element housed inside the housing for driving the liquid crystal display panel, and installed between the liquid crystal display panel and the drive element. A heat dispersion plate that disperses the heat generated from the driving element is provided. The heat dispersion plate consists of a resin frame and a metal plate fitted into the frame, and the heat dispersion plate is attached to the housing via the frame. An electronic device with a liquid crystal display panel characterized by: