JP3108051U - Improved structure of direct type backlight light source - Google Patents

Abstract

The brightness of a direct backlight light source is improved and made uniform.
A lamp 20 in a backlight module has an S-type structure, and the S-type lamp has three straight pipe portions 201 that are spaced apart from each other, and a bay fold portion 202 that connects left and right open ends of the straight pipe portions. And consists of The structure in which the ends of the S-type lamp are connected by the left and right bay folds not only increases the amount of emitted light and improves the overall brightness of the liquid crystal panel, but also the structure of the left and right bay folds increases the brightness of the frame part at the left and right ends. The luminance of the backlight can be made uniform by improving the luminance to be equal to the luminance at the center position.
[Selection] Figure 2

Description

  The present invention relates to a light source improvement structure for a direct type backlight module, and particularly to a structure having an S-type lamp for improving the luminance of a liquid crystal panel, and belongs to the technical development of the backlight module.

The backlight module is one of the important elements of a liquid crystal display panel. Since the liquid crystal molecules themselves do not emit light, the function of the backlight module is to provide a sufficient brightness and a uniformly distributed light source to display an accurate image.

As can be seen from the above, the point of superiority or inferiority of the brightness of the liquid crystal panel lies in the backlight module that provides the brightness to the liquid crystal panel, but a single light source (currently a cold cathode fluorescent lamp CCFL is used as the light source). The appearance of the cold cathode fluorescent lamp in a side light type backlight module arranged on the side of the module or a direct type backlight module in which a plurality of light sources are arranged directly below the module is mostly linear. The structure is adopted.

Referring to FIG. 5, in the configuration of the cold cathode tube lamp of the known direct type backlight module, the linear type lamp has a configuration in which a plurality of lamps are arranged at regular intervals, and is arranged below the light guide plate. The lamps arranged at regular intervals can provide a light source toward the left and right sides, but form a blind spot area where the light source cannot be provided in the front and rear end direction of the lamp. The corner frame portion becomes dark without effectively providing a light source, and the overall luminance contrast difference of the liquid crystal panel becomes remarkable.

Liquid crystal display panel manufacturers have developed a U-shaped lamp backlight module that uses a U-shaped lamp as the light source. As shown in FIG. 6, the U-shaped lamp used in combination with the linear lamp is Mainly, a U-shaped bay arc part is added to one end of the linear lamps arranged next to each other, and the LCD panel has sufficient brightness in the center. The bay arc portion of the lamp provides a preferable light source, and the luminance of the center of the liquid crystal panel and the frame edge is balanced, but on the other side, the light source by such bay arc portion is not provided, and the liquid crystal display The purpose of balancing the brightness of the entire panel is not achieved.

  Regardless of whether it is a linear lamp or a U-shaped lamp, it provides a certain brightness to the liquid crystal panel, so it can be said that the situation is sufficient for general document processing workers, but high brightness is required. For a game player, a known linear lamp or U-shaped lamp liquid crystal panel cannot meet the requirements. Further, the known backlight module employs a linear lamp or a U-shaped lamp design, and has the following drawbacks.

1. Since the direct-type backlight module uses a plurality of lamps arranged at regular intervals in the module as a light source, the plurality of linear lamps are sequentially arranged at predetermined positions on the light guide plate when the backlight module is assembled. The work is very complicated. Even if a U-shaped lamp is adopted, the lamp structure design in the backlight module is still not satisfactory because it can be shortened to half the process time of a linear lamp. .
2. As described above, the greater the number of lamps in the backlight module, the greater the number of connectors for controlling the lamps, and the lower the assembly speed of the backlight module. In addition, the cost problem of the backlight module must be solved in a situation where the usage of the connector does not decrease.
3. As the amount of the light emitting lamp used in the backlight module increases, the structural design of the high-pressure drive control of the lamp and the inverter that stabilizes the pressure becomes more complicated, and the accuracy of the control becomes problematic.
JP2004-200139

An object of the present invention is to provide an improved structure for a direct backlight light source.

In order to achieve the above-described object, the direct backlight light source improvement structure of the present invention greatly reduces the amount of lamps and connectors used by the S-shaped lamp design arranged in the backlight module, and the backlight module. A significant effect appears in the cost and assembly cost.

The direct backlight light source improvement structure of the present invention employs an S-shaped lamp in the backlight module to provide a sufficiently uniform brightness for the liquid crystal display panel. The structural design is simplified, and improvements can be made in terms of lamp driveability and stable pressure control.

The brightness of the entire liquid crystal panel is greatly improved, and the brightness uniformity of the liquid crystal panel is obtained.

As shown in FIG. 1, an improved structure 1 of a direct backlight light source according to the present invention includes a housing 10 (made of a metal or a plastic material), and a storage space 11 is formed in the housing. Accommodates an S-shaped lamp 20 (the lamp is LED, CCFL, ELD, CLL, etc., most preferably CCFL), and the lower end of the lamp 20 is further provided with a reflecting piece 21 to The light beam is reflected at a predetermined angle to the light guide plate (LPG) 30 above the lamp 20, and the light guide plate 30 is diffused at each angle and uniformly diffused by the diffuse reflection pattern structure of the light guide plate 30 or a configuration in which a diffusing agent is added. 30, the light guide plate 30 emits light uniformly, and the uniformly distributed light rays enter and conduct to the upper diffusion plate 40, and with the assistance of the diffusion plate 40, the light source distribution is made more uniform. The light beam after the diffuser plate 40 is uniformly dispersed is transmitted from the diffuser plate 40 to an upper light-intensifying plate 50 (or a prism, generally used in combination with a horizontal prism and a vertical prism). The uniformly diffused light source is refracted toward the panel (not shown because the panel is not a feature of the present invention) to improve the brightness of the panel.

In addition, based on other factors, an upper diffusing plate or a reflective polarizing piece is added to the upper layer of the light increasing plate 50 of the backlight module 1 to protect the prism and improve the brightness of the panel.

The most important improvement feature of the present invention is the design of the lamp 20 in the backlight module 1, and as shown in FIG. 2, the lamp 20 of the present invention is mainly arranged in a horizontal arrangement of upper, middle and lower. It consists of a tube part 201 (that is, a so-called linear lamp) and a two-bay folding part 202.

The right side of the upper and middle straight pipe parts 201 forms a bay fold 202, and the left side of the middle and lower straight pipe parts 201 also has a bay fold 202, and the S-shaped lamps 20 of the present invention are arranged in three horizontal intervals. The straight pipe part 201 and the straight pipe part 201 are composed of a bay fold 202 connected to the left and right open ends.

The design of the S-shaped lamp 20 that connects the left and right folds 202 of the straight tube portion 201 greatly improves the brightness of the entire liquid crystal panel, and the left and right frame brightness is provided by the bay fold 202. In addition, the brightness uniformity of the liquid crystal panel is obtained.

The present invention achieves a favorable equilibrium state of the brightness of the entire liquid crystal panel by the S-type lamp design, and improves the problem of excessive contrast difference between the center of the liquid crystal panel and the left and right frames.

Further, the lamp 20 in the backlight module 1 of the present invention adopts the S-type appearance design of the left and right bay folding portions 202, so that the backlight module 1 can be more easily assembled and the assembly speed is also accelerated. In addition to reducing the amount of lamp used by the S-type design, the lamp also reduces the amount of connector (not shown) used for coupling, thereby reducing the overall cost.

In addition, it should be noted that an excessive number of folds are added to the S-type lamp in the backlight module in response to a request to reduce the amount of connector used or to simplify the structural design of the inverter. If the stretch design is adopted, the total length of the lamp is too long, and it becomes difficult for the inverter to drive the lamp, the voltage cannot be accurately controlled, and uneven light emission occurs. In the light emitting lamp, as shown in FIG. 2, the liquid crystal panel image display is performed by the S-shaped design method of the two fold-folded areas composed of the three straight pipe sections 201 and the two fold-folded sections 202. Provides the necessary brightness.

The LCD panel of a general size can be provided with a desired brightness required for the panel by installing two types of S-type light-emitting lamps in the backlight module 1 and having two sets of folding areas. In addition to the reverse S type and S type arrangement as shown in FIG. 2, the S type light-emitting lamp of FIG. 2 has a normal S and reverse S arrangement system as shown in FIG. Panel luminance is greatly improved by combining the two S in the forward direction or by arranging them in the two reverse S directions.

In the present invention, preferred embodiments have been disclosed as described above. However, these are not intended to limit the present invention, and any person who is familiar with the technology can use various methods within the spirit and scope of the present invention. Therefore, the protection scope of the invention is based on the contents specified in the claims of the utility model.

1 is an external sectional view of the present invention. It is a top view of the S type light emission lamp of this invention. It is a top view of a different arrangement combination of the S type light emitting lamp of the present invention. It is a top view of other different arrangement combination of the S type light emitting lamp of the present invention. It is a top view of a well-known linear lamp. It is a top view of a well-known U-type light-emitting lamp.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Backlight module 10 ... Housing 11 ... Storage space 20 ... Lamp 201 ... Straight pipe part 202 ... Bay folding part 21 ... Reflecting piece 30 ... Light guide plate 40 ... Diffusing plate 50 ... Brightening plate

Claims (17)

An improved structure of a direct backlight light source, wherein the direct backlight module includes at least one or more S-type lamps,
The S-type lamp has three straight pipe portions arranged at regular intervals, and two bay folding portions that connect the left and right open ends of the straight pipe portion are formed integrally. Improved structure of type backlight light source. The improved structure of a direct type backlight light source according to claim 1, wherein the S-type lamp in the backlight module is further arranged in combination with a linear type lamp. The improved structure of the direct type backlight light source according to claim 1, wherein the S-type lamp in the backlight module is further arranged in combination with a U-type lamp. The improved structure of a direct type backlight light source according to claim 1, wherein two backlight sets of S-shaped lamps are combined in the backlight module. The improved structure of the direct type backlight light source according to claim 1, wherein the S-type lamp is a cold cathode fluorescent lamp CCFL. The improved structure of the direct type backlight light source according to claim 4, wherein the two sets of S-type lamps in the backlight module are arranged in the order of normal S and reverse S. The improved structure of a direct type backlight light source according to claim 4, wherein two sets of the S-type lamps in the backlight module are arranged in the order of reverse S and normal S. The improved structure of a direct type backlight light source according to claim 4, wherein two sets of the S-type lamps in the backlight module are arranged in combination with positive S. The improved structure of a direct type backlight light source according to claim 4, wherein the two sets of the S-type lamps in the backlight module are arranged in combination with inverted S. It is an improved structure of a direct type backlight light source, and the backlight module has at least one set of three interval straight pipe parts and a bay folding part connecting the right and left open ends of the straight pipe part integrally installed. Having an S-shaped lamp
A reflective piece installed on the lower side of the S-type lamp;
A light guide plate installed close to the upper part of the S-type lamp and further having a light-intensifying plate is installed on the upper side, and diffused light rays are diffused at various angles by the diffuse reflection pattern structure of the light guide plate or a configuration in which a diffusing agent is added. A diffusion plate that further uniformly disperses the light rays that are uniformly dispersed and emitted from the front surface of the light guide plate;
A housing that houses the above-described structure and constitutes a backlight module;
An improved structure of a direct type backlight light source characterized by comprising: The improved structure of a direct type backlight light source according to claim 10, wherein a diffuser plate or a reflective polarizing plate is additionally provided on the upper side of the light increasing plate. The improved structure of a direct type backlight light source according to claim 10, wherein the light-intensifying plate is formed by combining a horizontal prism and a vertical prism. The improved structure of a direct type backlight light source according to claim 10, wherein the housing is made of metal. The improved structure of a direct type backlight light source according to claim 10, wherein the housing is made of plastic. The improved structure of a direct type backlight light source according to claim 10, wherein the S-type lamp is a cold cathode fluorescent lamp CCFL. An improved structure of a direct type backlight light source, wherein the light source is an S-type lamp including three straight tube portions and left and right folds connecting the open ends of the straight tube portions. Improved structure of direct type backlight light source. The improved structure of a direct type backlight light source according to claim 16, wherein the S-type lamp is a cold cathode fluorescent lamp.

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