JPH10302528A - Flat-plate-like display unit with back-light - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flat-plate-like display unit with a back-light, preventing the distortion of a light correcting sheet caused by the thin type and low rigidity of a plate-like transpanent light leading body used as the back-light and generating no display unevenness. SOLUTION: In this display unit, notched parts 15 are formed on the places in a light, correction sheet 7 corresponding to the places of the ribs 14 in an inside casing 4 supporting a plate-like transparent light leading body 6, and the sheet 7 is moved so as to free external force, and the sheet 7 is pressed into the light leading body 6 to eliminate distortion even the light leading body 6 is bent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display with a backlight in which a light source is provided on the back of a flat panel display such as a liquid crystal display.

[0002]

2. Description of the Related Art A flat display device using a backlight is used in various flat display devices such as a liquid crystal display device for the purpose of reducing the thickness and weight of the display device.

[0003] Liquid crystal display devices have various features, such as low power consumption, light weight, and space saving, which are not present in conventional flat display devices, and are being used in a variety of products as their commercial strength is enhanced by advances in peripheral technology. . In this liquid crystal display device, an edge light type backlight is mainly used due to demand for low power consumption and compactness. FIG. 2A is a back view of a main part of a conventional liquid crystal display device with a backlight. , FIG. 2
FIG. 2B is a cross-sectional view of a main part taken along line AA of FIG.

In FIGS. 2 (a) and 2 (b), reference numeral 1 denotes a liquid crystal panel provided in an opening 3 of a device exterior body 2, 4 denotes an internal housing provided inside the device exterior body 2, and 5 Denotes an opening in the internal housing 4, and 6 denotes an acrylic having a thickness of 3 mm or less provided in the internal housing 4 via the light correction sheet 7 so as to face the liquid crystal panel 1 through the opening 5 in the internal housing 4. Etc., 8 is a light source provided on the side end surface of the plate-shaped transparent light guide 6, 9 is a reflection pattern provided on the back surface of the plate-shaped transparent light guide 6, and 10 is a reflection pattern 9 is a reflection plate provided on the back surface. FIG. 2A, which is a rear view of a main part, is a drawing in which the plate-shaped transparent light guide 6, the reflection pattern 9, and the reflection plate 10 are removed.

The light correction sheet 7 is inserted between the liquid crystal panel 1 and the plate-shaped transparent light guide 6 in order to more effectively use the light coming out of the surface of the plate-shaped transparent light guide 6. And
The direction other than the user becomes dark, but the direction of the light is collected on the front side of the user, and the direction of the user is brightened or the direction of the light is scattered, so that the back of the plate-shaped transparent light guide 6 is formed. The display quality is improved, for example, by making the reflection pattern 9 provided on the display invisible.

[0006] The liquid crystal display device with a backlight having the above-described structure is provided with a light source 8 introduced from the side end face of the plate-shaped transparent light guide 6.
Is reflected by the reflection pattern 9 and the reflection plate 10 and emerges from the surface of the plate-shaped transparent light guide 6 to irradiate the back surface of the liquid crystal panel 1.

Conventionally, notebook type personal computers have
Emphasis on functionality, PC screen size is 10 "
The above sizes are the mainstream, and from the viewpoint of energy saving, as a display unit of a desktop type personal computer,
Liquid crystal display devices with low power consumption, space saving, and low heat generation have been used.

The liquid crystal display devices used in these devices have a screen diagonal size of 30 cm (12.1 ″) to 35 cm at present.
(14 ").

In a liquid crystal display device having such a screen size as described above, if the liquid crystal display device having the above configuration is to be used, the rigidity of the plate-shaped transparent light guide made of acrylic or the like is reduced because the light guide is thin. As a result, a phenomenon occurs in which the liquid crystal display device is bent in the structure.

FIG. 2 is a sectional view of a main part of the liquid crystal display device in a defective state shown in FIG.
The same parts as those in the cross-sectional view of the main part shown in FIG. 2B are denoted by the same reference numerals and described. A part 11 of the light correction sheet 7 provided between the plate-shaped transparent light guide 6 and the inner casing 4 Plate-shaped transparent light guide 6
It is pressed locally by the deflection.

Normally, the light correction sheet 7 is provided with a gap around it so as not to be affected by external force such as movement due to vibration and expansion and contraction of the light correction sheet 7 itself due to temperature change. You can move freely inside. However, the portion of the light correction sheet 7 locally pressed by the deflection of the plate-shaped transparent light guide 6 is held down even when external force such as expansion and contraction or vibration of the light correction sheet 7 itself due to a temperature change is generated. , It will be the same as the fixed state, it will not be able to move and escape the external force,
At that portion, distortion occurs in the light correction sheet 7, and display unevenness 12 is seen on the liquid crystal panel of the liquid crystal display device as shown in the front view of the liquid crystal panel in the defective state in FIG.

In order to solve this problem, a back view of an essential part of another conventional liquid crystal display device with a backlight shown in FIG. 5A and an A of FIG. 5A shown in FIG. As shown in the cross-sectional view of the main part along the line A, a step 13 is formed on the inner peripheral edge of the opening 5 of the inner casing 4 in the apparatus exterior body 2 so that the plate-shaped transparent light guide 6 does not press down the light correction sheet 7. To form
It is conceivable that only the plate-shaped transparent light guide 6 is supported by the step 13 so that the plate-shaped transparent light guide 6 does not hit the light correction sheet 7 even if the plate-shaped transparent light guide 6 is bent. , The outer size of the plate-shaped transparent light guide 6 needs to be increased to provide an allowance, and the size of the backlight increases by the amount indicated by B, which is against the space saving of the device. become.

[0013]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems in the above-mentioned conventional liquid crystal display device with a back light, in which the rear surface of the display panel is made of a plate-shaped transparent light guide through a light correction sheet. In a flat panel display device with a back light to be illuminated, since the plate-shaped transparent light guide used as the backlight is thin and has low rigidity, even if the plate-shaped transparent light guide bends, the deflection corrects the light. It is an object of the present invention to provide a backlight-equipped flat panel display device that does not cause distortion in a sheet and does not cause display unevenness without increasing the backlight size.

[0014]

In order to solve this problem, a flat panel display device with a backlight according to the present invention is provided with a light correction sheet corresponding to a rib of an inner casing supporting a plate-shaped transparent light guide. A notch is formed at the position of the light correction sheet so that the external force can be released by moving the light correction sheet, and even if the plate-shaped transparent light guide is bent, the light correction sheet is pressed into the plate-shaped transparent light guide. Therefore, it is possible to obtain a flat panel display device with a backlight that does not cause distortion and does not cause display unevenness without increasing the backlight size.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention provides a light correction sheet provided on the back surface of a display panel between an internal housing having an opening and a plate-shaped transparent light guide. In a flat panel display device with a backlight, which irradiates with a plate-shaped transparent light guide through the inner case, a rib is formed on the periphery of the opening of the inner case, and the plate-shaped transparent light guide is brought into contact with the rib. A flat panel display device with a backlight in which a plate-shaped transparent light guide is held by a body and a cutout portion is formed at a position of a light correction sheet corresponding to a rib of the plate-shaped transparent light guide, and an internal housing abutting on the plate-shaped transparent light guide Since the notch is formed at the position of the light correction sheet corresponding to the location of the rib, even if the plate-shaped transparent light guide bends, the light correction sheet is pressed by the plate-shaped transparent light guide and may be distorted. It has the effect of disappearing.

According to a second aspect of the present invention, there is provided the flat panel display device with the backlight according to the first aspect, wherein ribs are formed on four sides of the opening of the inner housing. Since the ribs are provided on the four sides of the portion, it has an effect that the plate-shaped transparent light guide can be more stably held by the internal housing.

According to a third aspect of the present invention, the rear surface of the display panel is formed into a plate-like shape via a light correction sheet provided between an internal housing having an opening and the plate-shaped transparent light guide. In a flat panel display device with a backlight that irradiates with a transparent light guide, a rib is formed on the peripheral edge of the plate-shaped transparent light guide, and the peripheral edge of the opening of the internal housing is brought into contact with the rib. A flat panel display device with a backlight that holds a plate-shaped transparent light guide and has a cutout formed at a position of a light correction sheet corresponding to a rib of the plate-shaped transparent light guide. Since the notch is formed at the position of the light correction sheet corresponding to the position of the rib of the light body, even if the plate-shaped transparent light guide is bent, the light correction sheet is pressed by the plate-shaped transparent light guide and distorted. It has the effect of disappearing.

According to a fourth aspect of the present invention, there is provided the flat panel display device with backlight according to the third aspect, wherein ribs are formed on four sides of the plate-shaped transparent light guide. Body 4
Since the ribs are provided on the sides, the plate-shaped transparent light guide can be more stably held by the internal housing.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment) FIG. 1A is a back view of a main part of a flat panel display device with a backlight according to an embodiment of the present invention, and FIG. 1B is a sectional view taken along line AA of FIG. FIG.

1 (a) and 1 (b), the same components as those in FIGS. 2 (a) and 2 (b) showing the conventional example are denoted by the same reference numerals and described. Opening 3 of body 2
, A liquid crystal panel, 4 is an internal housing provided inside the apparatus exterior body 2, 5 is an opening of the internal housing 4, and 6 is opposed to the liquid crystal panel 1 through an opening 5 of the internal housing 4. As described above, a plate-shaped transparent light guide made of acrylic or the like having a thickness of 3 mm or less provided in the inner case 4 via the light correction sheet 7, and the inner case 14 holds the plate-shaped transparent light guide 6. Ribs 15 are provided at regular intervals inside the periphery of the opening 5 of the body 4, 15 is a notch formed at a position of the light correction sheet 7 corresponding to the rib 14 so as not to interfere with the rib 14, 8 is a plate A light source 9 is provided on the side end surface of the transparent light guide 6, 9 is a reflection pattern provided on the back surface of the plate-shaped transparent light guide 6, and 10 is a reflection plate provided on the back surface of the reflection pattern 9.

As described above, the plate-shaped transparent light guide 6 is brought into contact with the rib 14 provided inside the peripheral edge of the opening 5 of the internal housing 4, and the plate-shaped transparent light guide 6 is To support the ribs 14
Since the light correction sheet 7 corresponding to the position of the light correction sheet 7 is notched, the light correction sheet 7 can move to release the external force, and the large and thin plate-shaped transparent light guide 6 has insufficient rigidity. However, the plate-shaped transparent light guide 6 does not cause the light correction sheet 7 to be pressed and cause distortion, and a flat panel display device with a backlight that does not cause display unevenness can be obtained.

The width of the rib 14 may be any width as long as it supports the plate-shaped transparent light guide 6. 1 (a) and FIG.
In (b), two ribs 14 are provided on each side of the periphery of the opening 5 for a total of eight places, but the arrangement and the number may be any as long as the deflection of the plate-shaped transparent light guide 6 can be supported.
It is not necessary to provide them on all four sides, and they can be arbitrarily determined according to the size and configuration of each display. Further, the rib 14 does not necessarily need to be provided inside the periphery of the opening 5 of the internal housing 4, and the same effect can be obtained by providing the rib 14 on the plate-shaped transparent light guide 6 side.

[0023]

As described above, according to the flat panel display device with the backlight according to the present invention, the light correction sheet corresponding to the rib formed on the peripheral edge of the opening of the internal housing or the peripheral edge of the plate-shaped transparent light guide. By forming a notch at the point of, even if the plate-shaped transparent light guide is bent, the light correction sheet is pressed down by the plate-shaped transparent light guide and is not distorted, and the liquid crystal with backlight that does not cause display unevenness A display device can be obtained.

[Brief description of the drawings]

FIG. 1A is a main part rear view of a flat panel display device with a backlight according to an embodiment of the present invention. FIG. 1B is a main part cross-sectional view taken along line AA in FIG.

2A is a rear view of a main part of a conventional liquid crystal display device with a backlight, and FIG. 2B is a cross-sectional view of the main part along line AA in FIG. 2A.

FIG. 3 is a sectional view of a main part of a conventional liquid crystal display device with a backlight in a defective state.

FIG. 4 is a front view of a liquid crystal panel in a defective state of a conventional liquid crystal display device with a backlight.

5A is a rear view of a main part of another conventional liquid crystal display device with a backlight, and FIG. 5B is a cross-sectional view of the main part along line AA in FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 liquid crystal panel 2 device exterior 3,5 opening 4 inner housing 6 plate-shaped transparent light guide 7 light correction sheet 8 light source 9 reflection pattern 10 reflection plate 11 part of light correction sheet 7 12 display unevenness 13 steps 14 rib 15 Notch

Claims (4)

[Claims] 1. A backlight for illuminating a rear surface of a display panel with a plate-shaped transparent light guide via a light correction sheet provided between an internal housing having an opening and a plate-shaped transparent light guide. In the flat panel display device, a rib is formed on the periphery of the opening of the internal housing, the plate-shaped transparent light guide is brought into contact with the rib, the plate-shaped transparent light guide is held by the internal housing, and the rib is formed. A flat display device with a backlight in which a notch is formed at a position of a light correction sheet corresponding to the above. 2. The flat panel display device with a backlight according to claim 1, wherein ribs are formed on four sides of the opening of the internal housing. 3. A backlight for illuminating the rear surface of the display panel with a plate-shaped transparent light guide via a light correction sheet provided between an internal housing having an opening and the plate-shaped transparent light guide. In the flat display device, a rib is formed on the peripheral edge of the plate-shaped transparent light guide, and the opening peripheral edge of the internal housing is brought into contact with the rib to hold the plate-shaped transparent light guide in the internal housing, A flat panel display device with a backlight in which a notch is formed at a position of the light correction sheet corresponding to the rib. 4. The flat panel display device with a backlight according to claim 3, wherein ribs are formed on four sides of the plate-shaped transparent light guide.