Light guide device, backlight module and display device

Abstract

The invention discloses a light guide device, a backlight module and a display device. The light guide device comprises a slab-shaped light guide area and a double-wedge light guide area, wherein the slab-shaped light guide area comprises a first surface and a second surface which are parallel, and the distance between the first surface and the second surface is equal to the thickness of the slab-shaped light guide area. The thickness of one side of the double-wedge light guide area, which has a small thickness, is equal to the thickness of the slab-shaped light guide area, and the side of the double-wedge light guide area, which has the small thickness, is connected with the slab-shaped light guide area. A first wedge face and a second wedge face are respectively formed between one side of the double-wedge light guide area which has a large thickness and the first surface of the slab-shaped light guide area, and between the side of the double-wedge light guide area which has the large thickness and the second surface of the slab-shaped light guide area. Light enters into the light guide device through the side of the double-wedge light guide area which has the large thickness, and is reflected to air through the light guide device, and all reflection of the light is total reflection. The backlight module comprises the light guide device. The display device comprises the backlight module. The light guide device, the backlight module and the display device reduce the possibility of destroying the total reflection of the light guide device, and accordingly reduce the possibility of influencing visual effects of the display device caused by light leaks of the backlight module.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a light guide device, a backlight module and a display device. Background technique [0002] The display device includes a display module and a backlight module that provides a light source for the display module. The luminous effect of the backlight module directly affects the visual effect of the display device. [0003] The main function of the light guide plate is to direct the light to the direction required by the designer. It is the most important and technical component of the backlight module, especially the side-type backlight module. The side-type backlight module includes a light source and a light guide device. The light emitted by the light source enters from one side of the light guide device. The light guide device requires that every reflection of the light entering it from the light guide device to the air is total reflection. ; That is to minimize refraction ...

AI Technical Summary

Problems solved by technology

like figure 1 As shown, under the condition that H'-h' remains unchanged, the smaller L' is, the larger γ' is; the larger γ' is, the greater the probability that the reflection of light in the single-sided wedge is not total reflection; this will Cause light leakage due to refraction, which will affect the visual effect of the display device

Therefore, the existing light guide device can no longer meet the development trend of narrower frame of the display device.

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