JP2995888B2 - Liquid crystal display - Google Patents

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.

[0002]

2. Description of the Related Art In recent years, OA equipment for personal use has been remarkably spread, and its space saving has been regarded as important. Along with this, a demand for a space-saving liquid crystal display device, particularly a thinner one, has been increasing. Here, an example of reducing the thickness of a conventional liquid crystal display device will be described with reference to FIGS.

A signal from a controller for a liquid crystal display device is input through an input cable 7 to a power supply circuit board 6 including a potential generating circuit for driving a liquid crystal panel. The power supply circuit board 6 has an input circuit board 4 (hereinafter abbreviated as a signal electrode side input circuit board) of a flexible board 2 (hereinafter abbreviated as a signal electrode LSI-mounted flexible board) on which an LSI for driving a signal electrode is mounted. 2) output the signal to
A signal to the input substrate 5 (hereinafter, abbreviated as a scanning electrode side input circuit substrate) of a flexible substrate 3 (hereinafter, abbreviated as a scanning electrode LSI-mounted flexible substrate) on which an LSI for driving a scanning electrode is mounted is described. One output terminal is provided. By connecting these terminals to the input terminal of the signal electrode side input circuit board 4 and the input terminal of the scan electrode side input circuit board 5 by the relay cables 8 and 9, it is necessary to drive the liquid crystal panel 1. All the signals are supplied to the respective input circuit boards, and from there, the signals are supplied to the flexible board 2 with the LSI for driving the signal electrodes or the flexible board 3 with the LSI for driving the scanning electrodes. Thus, the liquid crystal panel is driven. At this time, the thickness of the liquid crystal display device is composed of the holding frame 12, the liquid crystal panel 1, the side-illuminated light source 10, the power supply circuit board 6, and the electronic components mounted thereon, as shown in FIG. Was about 14 mm at the maximum.

[0004]

However, in the above-mentioned prior art, the thickness of the liquid crystal display device exceeds 10 mm, and it is difficult to reduce the thickness of the device. Accordingly, the present invention is to solve such a problem, and an object of the present invention is to provide a thin liquid crystal display device.

[0005]

A liquid crystal display device according to the present invention comprises a liquid crystal panel, a flexible substrate on which an LSI for driving a scanning electrode of the liquid crystal panel is mounted, and a signal for supplying a signal to the flexible substrate. An input circuit board,
In a liquid crystal display device including a power supply circuit board and a side-illuminated light source, the side-illuminated light source is arranged on the back side of the liquid crystal panel, and the flexible substrate and the input circuit board are extended to the side of the liquid crystal panel. The power supply circuit board on which electronic components are mounted is disposed on the back side of the input circuit board, and the electronic component mounted on the power supply circuit board includes the power supply circuit board and the input. It is arranged so as to be located between the circuit board and the side of the side-illuminated light source. Further, the light source of the side-illuminated light source is arranged on a side of the liquid crystal panel on which the power supply circuit board is not arranged. Further, a flexible board on which an LSI for driving signal electrodes of the liquid crystal panel is mounted, and an input circuit board for supplying a signal to the flexible board,
The light source is disposed on the back of the side-illuminated light source.

[0006]

1A and 1B are views showing a structure of a liquid crystal display device according to an embodiment of the present invention. Here, (a) is a diagram viewed from the display surface, and (b) is a diagram viewed from the opposite side of the display surface. FIG. 2A is a sectional view taken along line AA of FIG.
FIG. 2B is a sectional view taken along line BB of FIG.

Here, the configuration of the liquid crystal display device according to the embodiment of the present invention will be briefly described. The signal of the controller for the liquid crystal display device is input to the power supply circuit board 6 through the input cable 7. In the power supply circuit board 6, an IC for a circuit for creating a potential for driving a liquid crystal panel, an I
Many electronic components such as C, chip tantalum electrolytic capacitor, chip ceramic capacitor, chip resistor, etc. are mounted. The power supply circuit board 6 is provided with two terminals for outputting a signal to the signal electrode side input circuit board 4 and one terminal for outputting a signal to the scan electrode side input circuit board 5. By connecting these terminals to the input terminal of the signal electrode side input circuit board 4 and the input terminal of the scan electrode side input circuit board 5 by the relay cables 8 and 9, it is necessary to drive the liquid crystal panel 1. All the signals are supplied to the respective input circuit boards, and from there, the signals are supplied to the flexible board 2 with the LSI for driving the signal electrodes or the flexible board 3 with the LSI for driving the scanning electrodes.
Thus, the liquid crystal panel is driven.

Here, the structure according to the embodiment of the present invention will be described in detail.

First, the structure on the signal electrode side will be described. LSI for driving signal electrodes connected to liquid crystal panel 1
The mounting flexible board 2 is previously connected to the signal electrode side input circuit board 4 by soldering, and this is
As shown in (a), the side-illuminated light source 10 and its fixing case 11 are mounted in a embracing manner. The decap 4b of the signal electrode side input circuit board 4a is mounted on the side opposite to the liquid crystal display surface. The liquid crystal panel 1 is mounted on the side-illuminated light source 10 and its fixing case 11 and is fixed by being sandwiched between the holding frame 12 and the holding frame 12 and the liquid crystal panel to protect the glass of the liquid crystal panel 1 from external pressure. Silicon rubber 13 is inserted between the two. At this time, the total thickness of the liquid crystal display device is 0.6 mm (pressing frame 12) +0.2 mm.
(Silicone rubber 13) + 2.8mm (Liquid crystal panel 1) +
2.5 mm (side illumination type light source 10) +0.8 mm (signal electrode side input circuit board 4a) +1.15 mm (pass capacitor 4)
b) +0.4 mm (floating margin between the signal electrode side input circuit board 4a and the side-illuminated light source 10) = 8.45 mm, which is 9.5 mm at the maximum considering various conditions such as tolerance and warpage of each part.

Next, the structure on the scanning electrode side will be described.
The scanning electrode glass of the liquid crystal panel 1 and the upper surface of the scanning electrode side input circuit board 5 are at the same height. At this time, a space of 1.5 mm is formed between the pressing frame 12 and the scanning electrode side input circuit board 5, so that the scanning electrode side input circuit board pass capacitor 5b and the scanning electrode driving LSI mounting flexible board 3 are provided in this space.
Implement to come. The power supply circuit board 6 is mounted at a position facing the scan electrode side input circuit board 5 with respect to the side-illuminated light source 10, and all the electronic components 6b of the power supply circuit board 6 are mounted in a space formed therebetween. . The space distance at that time needs to be such that the chip tantalum electrolytic capacitor 3.2 mm, which is the tallest component in the power supply circuit board 6, can be mounted, and a distance of 3.5 mm is required in consideration of floating during soldering of the component. Shall be opened. Further, the power supply circuit board 6 and the holding frame 12 are electrically conducted at the GND level. A claw is provided on the holding frame 12 to take the conduction,
The nail is hooked on the power supply circuit board 6. At this time, the total thickness of the liquid crystal display device depends on the presser frame 12, and its value is 8.5 mm.

A side-illuminated light source 10a such as a cold-cathode tube is provided on the side without the power supply circuit board 6 and the scan electrode side input circuit board 5.
To avoid their overlap with the board,
The thickness is not increased.

As described above, the liquid crystal display of this embodiment has a total thickness of 9.5 mm MAX. And becomes 4.5 mm thinner than the conventional liquid crystal display device.

Although the present embodiment describes a case where two signal electrode side input circuit boards are used, it is needless to say that the present invention can be realized with only one input circuit board.

As described above, in this embodiment, 10
mm or less can be provided.

According to the present invention described above, a side-illuminated light source is arranged on the back side of a liquid crystal panel, and a driving electrode for driving a scanning electrode is provided.
A flexible board on which the SI is mounted and an input circuit board for supplying signals to the flexible board are arranged to extend to the side of the liquid crystal panel, and a power supply circuit board on which electronic components are mounted is arranged on the back side of the input circuit board. Therefore, a distance at which the electronic component can be mounted can be provided in the space between the power supply circuit board and the input circuit board, so that the electronic component is between the power supply circuit board and the input circuit board and the side-illuminated light source is provided. The liquid crystal display device can be arranged to be located on the side of the device, and the liquid crystal display device can be made thinner by securing a place for disposing the electronic components, which has been thickened.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of the present invention.

FIG. 2 is a sectional view of FIG.

FIG. 3 is a diagram showing a conventional liquid crystal display device.

FIG. 4 is a sectional view of FIG. 3;

[Explanation of symbols]

 1… Liquid crystal panel 2… Flexible board with LSI for signal electrode 3… Flexible board with LSI for scan electrode 4, 4a… Input circuit board on signal electrode side 4b …… Pass capacitor 5, 5a… Input on scan electrode side Circuit board 5b Pass capacitor 6, 6a Power supply circuit board 6b Electronic components 7 Input cable 8 Relay cable 9 Relay cable 10 Side-illuminated light source 11 Fixed case 12 ...... Pressing frame 13 ...... Silicon rubber

Claims (3)

(57) [Claims] 1. A liquid crystal panel, a flexible substrate on which an LSI for driving a scanning electrode of the liquid crystal panel is mounted, an input circuit substrate for supplying a signal to the flexible substrate, a power supply circuit substrate, and a side surface. An illumination type light source, comprising: a side illumination type light source arranged on the back side of the liquid crystal panel; and the flexible substrate and the input circuit board arranged to extend laterally of the liquid crystal panel. On the back side of the input circuit board, the power supply circuit board on which electronic components are mounted is arranged, and the electronic component mounted on the power supply circuit board is provided between the power supply circuit board and the input circuit board. And a liquid crystal display device disposed so as to be located on a side of the side-illuminated light source. 2. The liquid crystal display device according to claim 1, wherein the light source of the side-illuminated light source is disposed on a side of the liquid crystal panel on which the power supply circuit board is not disposed. 3. A flexible board on which an LSI for driving signal electrodes of the liquid crystal panel is mounted, and an input circuit board for supplying a signal to the flexible board,
The liquid crystal display device according to claim 1, wherein the liquid crystal display device is disposed on a back surface of the side illumination light source.