Direct-lit backlight module and display device

Abstract

The invention relates to the technical field of display, and discloses a direct backlight module, which comprises a single-face reflector, a light bar, a first light guide plate, a double-face reflector, a second light guide plate, a first total reflection cavity and a second total reflection cavity, wherein the light bar is located between the first light guide plate and the reflection face of the single-face reflector; the second light guide plate is located at one side, deviating from the light bar, of the first light guide plate; the double-face reflector is located between the first light guide plate and the second light guide plate; the first total reflection cavity is connected onto each first end face of the first light guide plate and the second light guide plate; the second total reflection cavity is connected onto each second end face, opposite to the first end face, of the first light guide plate and the second light guide plate; both the first total reflection cavity and the second total reflection cavity are curved; and the first light guide plate, the second light guide plate, the first total reflection cavity and the second total reflection cavity form a structure with a section of a sealed annular shape. Compared with the traditional direct backlight module, the light mixing height is reduced, and thinness of the direct backlight module is realized.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a direct-lit backlight module and a display device. Background technique [0002] The structure of the traditional direct-lit backlight module is as follows: figure 1 with 2 As shown, it includes: LED light source 110 , lens 120 , back plate 130 , side reflection sheet 140 , diffuser plate 150 and diaphragm 160 . The light emitted by the LED light source 110 arranged on the back plate 130 can be scattered on the diffuser plate 150 more evenly after passing through a certain height of light mixing height x, and the light can be more evenly diffused by the diffuser plate 150, and then pass through the diaphragm 160 (diffuser, prism, protector etc.), etc., the optical quality of the picture of the backlight module will be better (uniform brightness). It can be seen that in order to make the optical picture of the direct-type backlight module more uniform, the light emitted by th...

AI Technical Summary

Problems solved by technology

It can be seen that in order to make the optical picture of the direct-type backlight module more uniform, the light emitted by the light source needs a certain light mixing height. If the light mixing height x is not enough (generally large, it depends on the distance y between the lamp and the lamp). , the screen will appear light and dark stripes, therefore, usually the direct type backlight module will be made relatively thick (the height of mixed light is generally about 30mm), and it is impossible to achieve a thin design

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