JP3092292B2 - Information processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information processing apparatus such as a notebook type Japanese word processor or a personal computer, or a display device used for such an information apparatus, and more particularly to an information processing apparatus having a liquid crystal display device as a display screen. It concerns the device.

[0002]

2. Description of the Related Art A portable information processing device such as a Japanese word processor or a personal computer includes an input device such as a keyboard, a control board, a storage device, and a magnetic disk drive. 2. Description of the Related Art There is known a device in which a storage device (hereinafter, referred to as an external storage device), a power supply device, and the like are arranged, and a lid that can be opened and closed is provided with a liquid crystal display surface.

As the liquid crystal display, there are display methods such as a transmission type and a reflection type. Recently, however, the former type with a backlight which can be used in a dark place without being influenced by the brightness of the use environment has been often adopted. Was.

In this type of liquid crystal display device, as shown in FIG. 5, a light guide plate made of LCD glass, glass material, plastic, or the like, a cold cathode tube, a control board, and the like are disposed on a lid, and a light guide plate beside the light guide plate. A cold cathode tube (backlight) having a diameter larger than the thickness of the light guide plate is arranged in the space.

In this configuration, the diameter of the tube is large with respect to the thickness of the light guide plate, the rate of light incident on the light guide plate is low with respect to the illuminance of light emitted from the cold cathode fluorescent lamp, and the efficiency of the illuminance and brightness of the liquid crystal display screen is given. Was bad.

[0006]

In the prior art, as described above, since the diameter of the cold cathode tube is larger than the thickness of the light guide plate, the light radiated from the cold cathode tube in the radial direction is reduced by the light guide plate. And the light is guided to the light guide plate, so that the rate of light incident on the light guide plate is low, and it is difficult to increase the brightness and brightness of the liquid crystal display screen.

Conventionally, since a large-capacity cold-cathode tube is used to brighten the screen of a liquid crystal display device, it is inevitably impossible to prevent the cold-cathode tube from increasing in diameter, and the power consumption is large. That included the problem. Further, even if a cold cathode tube having a large capacity is used, the light guide plate cannot be efficiently irradiated with light as described above, and as a result, the display screen cannot be made bright.

Further, since the tube diameter of the cold cathode tube is larger than the thickness of the light guide plate, if a large external pressure which cannot be received by the case after the assembly is applied, the external pressure is applied to the cold cathode tube and the cold cathode tube is damaged. It also has problems.

In view of the above, it is a main object of the present invention to provide an information processing apparatus capable of efficiently guiding the light of a cold cathode tube to a light guide plate and displaying a bright screen.

It is another object of the present invention to provide a highly reliable information processing device or display device which prevents breakage of a cold cathode tube.

[0011]

The object of the present invention is to provide a main body case having a control board and a storage device, an input device provided in the main body case, a lid openably and closably attached to the main body case, a liquid crystal display unit provided, and the liquid crystal display unit has a light guide plate provided on the back of an inverter substrate for driving the liquid crystal is arranged around the liquid crystal display unit and the cold cathode tubes Contact for irradiating light to the light guide plate With lid closed lid
Sometimes a lid case that forms the upper surface of the information processing device,
A liquid crystal unit having a rectangular display surface on the input device side,
And a panel provided around the liquid crystal unit.
The liquid crystal unit includes a glass in which liquid crystal is sealed, and the glass
And a light guide plate provided behind the rectangular display surface.
On one of the short sides, the light guide plate is made of glass filled with liquid crystal.
So that it protrudes out of the glass,
Place a cold-cathode tube on the side of the protruding part.
Make the tube diameter equal or nearly equal to the thickness of the light guide plate, and
A reflection sheet is provided so as to sandwich the projection of the light plate.
Place the cold cathode tubes inside the
Leave a gap at the end in the shorter side direction
And a panel is provided on the display surface side across the frame.
By placing the lid case on the opposite side
The panel and the lid case are framed further on the end side than the cold cathode tube.
The distance between each other is maintained through the
The thickness of the camera is larger than the thickness of the LCD unit.
With the reflection sheet with built-in cold cathode tube and the inside of the panel
Between the frame position
At the end separated by a predetermined distance, the lid case is fixed to the panel.
This is achieved by making up the building .

[0012]

According to the present invention, since the diameter of the cold cathode tube is equal to or substantially equal to the thickness of the light guide plate, light generated from the cold cathode tube can be directly incident on the light guide plate. It works to increase the irradiation efficiency. In addition, it is possible to obtain a liquid crystal display screen with high illuminance and brightness even with low power consumption, and even when external pressure is applied to the main body, the light guide plate functions as a strength member to prevent breakage of the cold cathode tube and the like. .

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the present invention will be described below with reference to the drawings of one embodiment.

FIG. 1 is a perspective view of a portable information processing apparatus such as a notebook type word processor or a personal computer in a state where a lid having a liquid crystal display screen is opened.

In FIG. 1, reference numeral 1 denotes a keyboard as an input device. A liquid crystal display unit 2 for displaying input information from the keyboard 1 is incorporated in a cover 3 which can be opened and closed, and has a structure in which the front surface is covered by a liquid crystal panel 4. ing. Reference numeral 5 denotes an external storage device such as a magnetic disk drive or a card memory for recording edited information obtained by editing the information input by the input device 1, and includes a main body lower case 6 and a main body It is interposed between the cases 7. A function key 8 is provided behind the keyboard 1 of the upper case 7 so as to be laterally juxtaposed with the external storage device 5. When the function keys 8 are formed integrally with the keyboard 1 of the input device and have the same structure, if the keyboard 1 and the external storage device 5 are arranged side by side with respect to the depth direction to reduce the thickness, the size in the depth direction increases. In some cases, a separation structure is required.

On the other hand, 9 is a liquid crystal display unit, which is an upper LCD.
The liquid crystal is sealed in a gap formed between the glass 10 and the lower LCD glass 11, and the upper LCD glass 10, the lower LC
The upper and lower polarizing plates 12 and 13 are formed on the surfaces of the LCD glasses 10 and 11 by being adhered to the surfaces thereof. Around the LCD glass, a common-side substrate 15 and a segment-side substrate 16 on which a chip-on-board (COB) 14 is mounted for thinning, and are heat-sealed to the respective electrodes of the LCD glass. ing. Further, a liquid crystal control board 17 for controlling both substrates is arranged in a plane on the right side of the LCD glass, and the liquid crystal control board 17 is connected to the common-side board 15 and the segment-side board 16 by flexible harnesses 18, respectively. I have.

The lower LCD glass 1 below the liquid crystal display section 9
A light guide plate 19 made of a material such as an acrylic resin is provided facing the entire lower surface of the light guide plate 1, and the light guide plate 19 uniformly emits light from a cold cathode tube 20 as a light source over the entire surface of the liquid crystal display unit 9. It leads efficiently. In addition, a diffusion plate 21 is provided between the light guide plate 19 and the lower polarizing plate 13, and a reflection plate 22 is provided on the rear surface of the light guide plate 19, and the cold cathode tubes 20 are surrounded by a reflection sheet 23, and the efficiency of the liquid crystal display unit 9 is improved. The light emission of the cold-cathode tube is guided specifically.

As described above, the liquid crystal display portion 9, the common side substrate 15, the segment side substrate 16, the liquid crystal control substrate 17, the inverter substrate 24, etc., which are arranged in a plane, are mounted on the resin molded LCD frame 27. Things.

Next, the relationship between the light guide plate 19 and the cold cathode tube 20 of the liquid crystal display unit will be described in detail.

The brightness of the surface of the liquid crystal display unit 9 is controlled by the cold cathode fluorescent lamp 20.
It depends on how efficiently the light emitted from the light enters the light guide plate 19. In the present invention, the center of the light guide plate coincides with or substantially coincides with the center of the cold cathode tube 20.
Light from 0 is directly incident on the light guide plate, and there is almost no loss. In other words, the light guide plate 19 is in the radial direction of the cold cathode fluorescent lamp 20,
That is, it is made to correspond to the radiation direction of light. At this time, the diameter of the cold cathode tube 20 does not necessarily need to be smaller than that of the light guide plate, and even if it is large, a large amount of light can be given to the light guide plate as long as the centers thereof match each other. However, if the cold cathode tube is larger than the light guide plate, the problem that the cold cathode tube is broken by an external force acting on the LCD frame or the lid cannot be solved.

In order to solve this problem, the diameter of the cold-cathode tube 20 is made equal to or substantially equal to the thickness of the light guide plate 19, and the center of the tube is set to the side of the light guide plate 19. Should be arranged. Since the cold-cathode tubes are arranged on the sides within the thickness range of the light guide plate, the cold-cathode tubes 2
The light emission of 0 is incident on the light guide plate 19 at a high rate, and the surface luminance of the liquid crystal display unit 9 can be increased. When the same illuminance and luminance are to be secured, the power consumption can be reduced. Become. Further, when the thin liquid crystal display device 2 has a thin structure as in the present structure, the cold cathode fluorescent lamp 2 is applied by an external pressure applied from the outside.
Although consideration must also be given to breakage such as 0, the light guide plate 20 is made smaller than the thickness of the light guide plate 19 as described above. 1
9 functions as a reinforcing member and can be configured to prevent breakage of the cold cathode tube 20 and the like. In this embodiment, the cold cathode tubes 20 are arranged in the short side direction of the light guide plate 19, but are arranged in the long side direction of the light guide plate 19 to improve the surface brightness of the liquid crystal display unit 9. It goes without saying that you can do it.

[0022]

As described above, according to the present invention, the cold cathode tube is arranged on the side of the light guide plate and the diameter of the cold cathode tube is made equal to or substantially equal to the thickness of the light guide plate. It is possible to provide an information processing apparatus capable of efficiently guiding the light of the tube to the light guide plate, displaying a bright screen, and preventing breakage of the cold-cathode tube.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention and showing a use state of a portable information processing apparatus.

FIG. 2 is a connection structure diagram of a main body and a liquid crystal display device.

FIG. 3 is a detailed view of a liquid crystal display device.

FIG. 4 is a sectional view taken along line AA in FIG. 3;

FIG. 5 is a development view of the liquid crystal display device of the present invention.

FIG. 6 is a development example of the tip of the AA cross section in FIG. 3;

[Explanation of symbols]

REFERENCE SIGNS LIST 1 keyboard, 2 liquid crystal display device, 3 lid, 5 external storage device, 9 liquid crystal display unit, 17 liquid crystal control board, 19
... Light guide plate, 20 ... Cathode, 24 ... Inverter board, 2
5. Control board.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-111233 (JP, A) JP-A-1-49022 (JP, A) JP-A-62-169192 (JP, A) JP-A-63-1988 180905 (JP, A) JP-A-3-293695 (JP, A) JP-A-3-256090 (JP, A) JP-A-2-47622 (JP, U) JP-A-2-58282 (JP, U) Japanese Utility Model Application Hei 3-56974 (JP, U) Japanese Utility Model Application Sho 62-158427 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02F 1/13357 G02F 1/1333

Claims (1)

(57) [Claims] A main body case provided with a control board and a storage device; an input device provided in the main body case; a lid attached to the main body case so as to be openable and closable; A light guide plate provided on the back surface of the liquid crystal display unit; a cold cathode tube for irradiating the light guide plate with light; and an inverter board disposed around the liquid crystal display unit and driving liquid crystal. A lid case forming an upper surface of the information processing device when the lid is closed, a liquid crystal unit having a rectangular display surface on the input device side of the lid, and a panel provided around the liquid crystal unit, The liquid crystal unit includes a glass in which liquid crystal is sealed, and the light guide plate provided behind the glass, and the light guide plate is longer than the glass in which the liquid crystal is sealed on one of the short sides of the rectangular display surface. So as to protrude out of the glass, the cold cathode tube is arranged on the side of the protruding portion of the light guide plate, and the tube diameter of the cold cathode tube is equal to or substantially equal to the thickness of the light guide plate; A reflection sheet is provided so as to sandwich the protruding portion of the light guide plate, the cold cathode tubes are arranged inside the reflection sheet, and a frame is arranged at a further end side in the short side direction from the reflection sheet. The frame is provided between the panel and the lid case.
The lid case and the panel are sandwiched by the frame.
The panel is located on the display surface side, and the lid case is located on the opposite side , so that the panel and the lid case are spaced apart from each other via the frame at a further end than the cold cathode tube. Is formed, and the thickness of the frame is larger than the thickness of the liquid crystal unit, so that a space is provided between the reflection sheet including the cold cathode tubes and the inside of the panel. An information processing apparatus having an existing structure, wherein the lid case is fixed to the panel at an end portion separated from the position of the frame by a predetermined distance.