Backlight module and liquid crystal display device

Abstract

The invention belongs to the field of liquid crystal display, and particularly relates to a liquid crystal display device and a backlight module. The backlight module includes a lamp strip, a light strip heat sink and a light guide plate, wherein an opto-coupling distance is arranged between the lamp strip and the light guide plate; and the backlight module further includes a controller used for controlling the opto-coupling distance, wherein a through hole is arranged in the lamp strip, the controller penetrates the through hole, the controller is arranged on the light strip heat sink, and the light strip heat sink provides the fixing force for controlling the position of the light guide plate. In the backlight module, the controller used for controlling the opto-coupling distance is not arranged on the lamp strip, but on the light strip heat sink, so that the fixing force for controlling the position of the light guide plate is not born by the lamp strip any longer, and is transferred onto the lamp strip heat sink; and the lamp strip is an aluminum extrusion profile with certain thickness and high strength, and can bear larger fixing force, therefore, the lamp strip is not influenced by external force any longer, is prevented from deformation easily, and avoids influence on electric properties.

Description

technical field [0001] The invention belongs to the field of liquid crystal display, and more specifically relates to a backlight module and a liquid crystal display device. Background technique [0002] In the prior art, a liquid crystal display device generally includes a liquid crystal display panel and a backlight module. Since the liquid crystal display panel cannot emit light, the backlight module needs to provide a surface light source that emits uniform light. The light source of the side-light backlight module is generally a light bar. Since the light bar generates high heat, it is necessary to provide a light bar heat sink to improve heat dissipation efficiency. The distance between the light emitting surface of the light bar and the light incident surface of the light guide plate is called the light coupling distance, which is an important optical parameter. When the light coupling distance changes, the optical performance of the backlight module will change accor...

AI Technical Summary

Problems solved by technology

The distance between the light emitting surface of the light bar and the light incident surface of the light guide plate is called the light coupling distance, which is an important optical parameter. When the light coupling distance changes, the optical performance of the backlight module will change accordingly. In order to improve the backlight The optical taste of the module needs to strictly control the coupling distance, such as figure 1 As shown, the method adopted in the prior art is to set a metal block 4 on the light bar 1, the metal block 4 is in contact with the light incident surface of the light guide plate 3, and the thickness of the metal block 4 is designed to control the light bar 1 and the light guide plate 3 The light coupling distance between them, but because the metal block is fixed on the light strip by patch technology, the bonding strength is low, and it is often not firm, and it is easy to fall off when the backlight module is impacted by external force, thus losing the effect of controlling the light coupling distance ; In addition, the light bar is an electronic part, and when it is used as a structural part, it is easy to deform, which will affect the electrical performance

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