Flat display device and its backlight module

Abstract

The invention relates to a flat panel display device and a backlight module thereof, the backlight module comprises a back plate comprising a light guide plate fixing part; a light guide plate comprising a light incident surface and an end surface which is connected with the light incident surface, the end surface additionally comprises a back plate clamping part and a holding piece clamping part, the light guide plate is clamped with the light guide plate fixing part by the back plate clamping part and fixed on the back plate; a holding piece comprising a light guide plate limiting part and a light-emitting module fixing part, the light guide plate limiting part is mutually clamped with the holding piece clamping part for limiting the displacement of the light guide plate; and a light-emitting module which is fixed on the light-emitting module fixing part, and a distance is maintained between the light-emitting module and the light incident surface. Therefore, the fixed distance can be maintained between the light incident surface of the light guide plate and the light-emitting module, thereby stabilizing the luminance of the backlight module and avoiding the damage of the light-emitting module due to the expansion and the oppression of the light guide plate.

Description

technical field [0001] The invention relates to a backlight module, in particular to a backlight module in which the distance between a light-emitting diode light bar and a light-incident side of a light guide plate is fixed by a clamping piece. Background technique [0002] In a side-illuminated backlight module, in order to fix optical elements such as a light guide plate (LGP) on the backplane and achieve the purpose of positioning the optical elements, the backplane carrying the optical elements and the light source is usually There will be a design with fixed optical components, and the light source is usually a light-emitting diode module or a cold cathode lamp. As disclosed in China Taiwan Patent No. I266933, the optical element is fixed and positioned by cooperating with a plurality of protrusions on the main body and a positioning piece on the back plate. Wherein, a positioning groove can be formed between adjacent protrusions, and the positioning piece at least in...

AI Technical Summary

Problems solved by technology

And when the light guide plate 1 shrinks when the temperature drops or the temperature changes, due to the deformation or even permanent deformation of the mechanism fixing the LED light bar 2 or the light guide plate 1, the LED light bar 2 usually does not return to the original state. The position of the design, so that the distance H between the light-emitting diode strip 2 and the light-incident side of the light guide plate 1 0 increase to H 0 ’, and H 0 ’ with H 0 The gap can reach up to 0.92 millimeters (mm), nearly 1 millimeter (mm), so that the light-emitting diode light bar 2 is on the light-incident surface I of the light guide plate 1 0 The incident light efficiency decreases, which in turn affects the light output efficiency of the backlight module, and the luminance will be reduced by about 10%.

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