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LED line light source and backlight source device

A technology of LED light source and line light source, applied in the field of backlight device, can solve the problem of uneven brightness and darkness, and achieve the effect of reducing cost and eliminating uneven brightness and darkness

Inactive Publication Date: 2009-10-14
SHANGHAI SVA LIQUID CRYSTAL DISPLAY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the fewer the number of LEDs used, the larger the distance between the LED light sources will be, and the phenomenon of uneven brightness and darkness will be more obvious.

Method used

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  • LED line light source and backlight source device
  • LED line light source and backlight source device
  • LED line light source and backlight source device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] First, the LED light source 10 and the light guide rod 11 are combined to form a image 3 The shown single-side light incident LED line light source (in order to improve efficiency, the parts other than the light incident side and the light exit side are all covered with reflective sheets 16). According to the size of the backlight, select the number of LED line light sources, and assemble them into a Figure 4 The LEDLight Bar shown. Combining the LED Light Bar and the light guide plate 20 in the same way as the CCFL, that is, setting the LED Light Bar on the side of the light guide plate 20, forms such as Figure 6 Shown is a new type of LED backlight that receives light from one side of the light guide plate.

[0044] Figure 7 It is a cross-sectional view of the new LED edge-type backlight device. Its light-emitting principle is similar to that of the CCFL edge-type backlight device, except that the CCFL is replaced by the LED Light Bar of the present invention. ...

Embodiment 2

[0046] In order to improve the brightness and optical quality of the backlight device, the LED line light source with the light guide bar double-sided light input method can also be used, such as Figure 8 shown. According to the size of the backlight, select the number of LED line light sources, and assemble them into a Figure 9 LED Light Bar shown. Such as Figure 9 As shown in , the LED line light source is arranged on the circuit substrate, and the electrical connection can be completed by welding. Each LED line light source can be connected in parallel or in series. The circuit substrate can be straight, see Figure 9 , can also be L-shaped, see Figure 10 . Combining the LED Light Bar and the light guide plate 20 in the same way as the CCFL forms a Figure 11 The new LED backlight that receives light from both sides of the light guide plate is shown.

Embodiment 3

[0048] In order to obtain higher brightness, we can also adopt the method of simultaneously entering light from the four sides of the light guide plate, such as Figure 12 shown. (LED line light sources can also include image 3 The light guide rod single-side incident light type and Figure 8 The light guide shown is a double-side light type).

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PUM

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Abstract

The invention discloses an LED line light source and backlight source devices. The LED line light source comprises a light guiding rod and at least one LED light source, wherein the light guiding rod comprises a plurality of sides, two sides with smaller end areas are light incoming sides, one side with a larger area is a light emitting side, and at least one side corresponding to the light emitting side is internally provided with scattering nodes; and the LED light source is arranged at the light incoming sides of the light guiding rod. One of the backlight source devices comprises a light guide plate and at least one lighting strip, wherein the lighting strip is arranged at the side of the light guide plate, the other backlight source device comprises a plurality of the LED line light sources, a diffusing plate covered above the LED line light sources, and at least one optical thin-film covered above the diffusing plate. The structure can ensure that the backlight source devices obtain surface light sources with uniform brightness by utilizing less LED light sources, thereby lowering the lost and being capable of selecting the number of the LED line light sources according to the sizes of the backlight source devices.

Description

technical field [0001] The invention relates to a backlight source device, in particular to an LED line light source and a corresponding backlight source device. Background technique [0002] At present, the backlight device used as the light source of the liquid crystal display is mainly divided into two types according to the position of the light source: a direct type and an edge type. In the direct type backlight, the light source is located directly below the LCD panel, and the light is directly irradiated on the LCD panel. Due to the large number of lamp tubes that can be used, it is easy to obtain high brightness. In the tall TV module; while the light source of the edge type backlight is located on the side of the light guide plate (Light guide plate), through the light guide plate, the light from the light source at the side is guided into the interior, and after total reflection and scattering of the dots at the bottom of the light guide plate, the light It emits ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21S4/00F21V8/00G02F1/13357F21Y101/02G02F1/1335
Inventor 徐朝毅
Owner SHANGHAI SVA LIQUID CRYSTAL DISPLAY