JP3108014U - Double-sided backlight module - Google Patents

Abstract

A double-sided light emitting backlight module is provided.
The double-sided light emitting backlight module of the present invention mainly combines a side light source 13 with a light guide plate 14, and the light guide plate transmits light rays of the light source to the main and sub-displays 11 and 12 on both the front and rear sides. Direct upward. A lower diffusing piece 15, a brightening piece 17, and an upper diffusing piece 18 are provided between the light guide plate and the main display curtain, and elements such as a reflecting piece 16, a brightening piece, and an upper diffusing piece are provided between the light guide plate and the sub display curtain. Is used to reflect the light rays of some sub-display curtains to the main display curtain, cancel the lower diffusion piece between the light guide plate and the sub-display curtain, reduce the light transmission wear, improve the brightness, structure The purpose is to simplify the device, increase the production speed, and control the cost.
[Selection] Figure 2

Description

  The present invention relates to a double-sided light-emitting backlight module, and more particularly to a high-brightness, thin-type backlight module used for a double-sided liquid crystal display.

With the development of digital products and wireless communication, the display will change from the known cold cathode tube CRT to various, more thin and light liquid crystal display LCD that is convenient to carry, LED is thin, power saving, low power There are advantages such as radiation, and it has been applied to various electronic products and has become the mainstream of display devices.

In the liquid crystal display panel device, the liquid crystal panel itself to display does not have a light emission effect, and therefore, it is necessary to separately provide a light source on the liquid crystal panel, and this light source function is executed by the backlight module. . There are two types of backlight modules: direct type and side light type. The liquid crystal display (ie, double-sided display of a mobile phone) that partially requires a double-sided display is used to make the overall thickness of the backlight module. To reduce. As shown in FIG. 1, the backlight module includes a light source 90 and a light guide plate 91 on the side, and the light guide plate 91 uniformly guides the light emitted from the light source 90 on the side surface to both the front and rear sides. Both the main display curtain 92 and the sub display curtain 93 before and after the liquid crystal display obtain light rays from the light source 90. Between the light guide plate 91 and the main display curtain 92, there are provided a lower diffusion piece 94, a light-intensifying piece 95, an upper diffusion piece 96, and the like. Prevents shadows of light reflection points from being seen above. The main action of the light-intensifying piece 95 is light collection, which increases the brightness generated by the back module. The upper diffusion piece 96 is not an indispensable structure, and its installation purpose is to protect the brightening piece, prevent the Newton ring phenomenon from occurring on the screen, and further improve the display effect of the main display curtain 92. Between the light guide plate 91 and the sub display curtain 93, a lower diffusion plate 94, a light increasing piece 95, a reflecting piece 97, and the like are provided, and their functions are similar to those of the elements between the main display curtain 92 and the sub display curtain 93 side. A reflection piece 97 is added between the light guide plate 91 and the lower diffusion plate 94, the reflection piece 97 reflects the partial light beam of the light source 90 in the direction of the main display curtain, and the main display curtain 92 is generally a sub-display. Since it is larger than the curtain 93, a large amount of light is required. Therefore, the reflection piece 97 is added to achieve the function of adjusting the proportion of the light sources 90 of the main and sub display curtains 92 and 93.

However, in this kind of known double-sided light emitting backlight module, a part of the light beam of the sub display curtain 93 is reflected on the main display curtain 92 by the reflecting piece 97, and therefore, the lower diffusion of the sub display curtain 93 is caused. If the piece 94 elapses, a problem of insufficient luminance is likely to occur. When the problem is solved by improving the light intensity of the light source 90, the cost is high and the power consumption is large.
JP2004-063439

An object of the present invention is to provide a double-sided light-emitting backlight module and to improve the disadvantages of the known double-sided light-emitting backlight module such as being thick and insufficient in luminance.

In order to achieve the above-described object, the present invention combines a side light source with a light guide plate, and the light guide plate directs light rays of the light source on the main and sub display curtains on both the front and rear sides. Between the light guide plate and the main display curtain, a lower diffusion piece, a brightening piece, and an upper diffusion piece are provided, and between the light guide plate and the sub display curtain, an element such as a reflection piece, a brightening piece, and an upper diffusion piece is provided. Used to reflect the light of the sub-display curtain to the main display curtain, cancel the lower diffusion piece between the light guide plate and the sub-display curtain, reduce the light transmission wear, improve the brightness, simplify the structural elements Achieve the purpose of increasing production speed and controlling costs. Therefore, the present invention is a practical and novel idea.

According to the present invention, it is possible to reduce the transmission wear of light, improve the brightness, simplify the structural element, increase the production speed, and achieve the purpose of suppressing the cost.

As shown in FIG. 2, the double-sided light emitting backlight module of the present invention is placed in a housing 10 (the housing is made of a metal or plastic material). The liquid crystal display module is a main display curtain 11, and the rear display module is a sub display curtain 12. The backlight module includes at least one side light source 13 (the light source is a cold cathode fluorescent lamp CCFL, a light-emitting diode LED, an EL display, etc., most preferably an LED), and a light guide plate 14. The light source 13 adjacent to the side side guides the light beam of the light source 13 onto the main and sub display curtains 11 and 12 at both ends of the light guide plate 14 and between the light guide plate 14 and the main display curtain 11 in order. 15, the light increasing piece 17 and the upper diffusion piece 18 are provided, and when the light beam of the light source 13 enters the light guide plate 14 and is directed to the main display curtain 11, first, the lower diffusion piece 15 passes and the lower diffusion piece is passed. The action of the piece 15 is to diffuse the light rays and adjust the balance of the light rays so that the shadow of the reflection point of the light rays cannot be seen on the main display curtain 11. After the light beam exits from the lower diffusion piece 15, the light beam enters the light brightening piece 17. The light brightening piece 17 corrects the direction of the light and brings a light condensing effect on the light beam whose original directivity is not preferable, thereby increasing the brightness of the front surface. Increase. The upper diffusion piece 18 is not an indispensable element, and the installation purpose is to protect the brightening piece and prevent the Newton ring from appearing on the screen. 11 display effect is further preferred. Between the light guide plate 14 and the sub-display curtain 12, a reflecting piece 16, a light-intensifying piece 17, and an upper diffusion piece 18 are provided in this order, and the sub-display curtain 12 is often a main display. Therefore, the reflection plate 16 is installed between the light guide plate 14 and the sub display curtain 12, and the light beam at the light source 13 is returned to the main display curtain 11 by the reflection piece 16. After the light enters the reflecting piece 16, the light beam that is not reflected passes through the reflecting piece 16 and directly enters the light increasing piece 17 and is collected by the light increasing piece 17 to achieve the purpose of improving the luminance. Finally, depending on the situation, the upper diffusion piece 18 is added, the upper diffusion piece 18 protects the brightening piece, prevents the Newton ring phenomenon from appearing on the screen, and can be replaced by a reflective polarizing piece. The display effect of the display 12 can be further improved.

The double-sided light emitting backlight module of the present invention achieves the effect of increasing the brightness, reducing the thickness, and reducing the cost.

It is structural sectional drawing of a well-known double-sided light emission backlight module. 1 is a structural cross-sectional view of a double-sided light emitting backlight module of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Housing 11 ... Main display curtain 12 ... Sub main display curtain 13 ... Light source 14 ... Light guide plate 15 ... Lower diffuser piece 16 ... Reflective piece 17 ... Brightening piece 18 ... Upper diffuser piece 90 ... Light source 91 ... Light guide plate 92 ... Main display Screen 93 ... Sub-display screen 94 ... Lower diffusion piece 95 ... Brightening piece 96 ... Upper diffusion piece 97 ... Reflection piece

Claims (6)

A double-sided light-emitting backlight module, which is installed in a housing, and a main display curtain and a sub-display curtain are installed on both sides of the housing, respectively, and the backlight module includes at least one light source and a light guide plate The light guide plate guides light rays of a light source to the main and sub display curtains,
Between the light guide plate and the main display curtain, in order, has a lower diffusion piece and a brightening piece, and between the light guide plate and the sub display curtain, in turn, has a reflection piece and a brightening piece. The light beam of the sub-display curtain is reflected by the reflecting piece to the main display curtain, and by canceling the diffusion piece between the light guide plate and the sub-display curtain, the transmission loss of the light ray is reduced, and the backlight module A double-sided light emitting backlight module characterized in that the thickness is reduced. An upper diffusing piece is added near the main display curtain of the backlight module, and light intensity and balance are adjusted by the upper diffusing piece to further improve the display effect of the main display curtain. The double-sided light emitting backlight module according to claim 1. An upper diffusion piece is added near the sub display curtain of the backlight module, and light intensity and balance are adjusted by the upper diffusion piece to further improve the display effect of the sub display curtain. The double-sided light emitting backlight module according to claim 1. The double-sided light emitting backlight module according to claim 1, wherein the housing is made of a plastic material. The double-sided light emitting backlight module according to claim 1, wherein the housing is made of a metal material. The double-sided light emitting backlight module according to claim 1, wherein the light source is a cold cathode fluorescent lamp CCFL.

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