Side-entry type backlight module and liquid crystal display device

Abstract

The invention provides a side-entry type backlight module and a liquid crystal display device. The side-entry type backlight module includes a heat-dissipation aluminum extrusion, a back plate, a light guide plate, and an LED light bar; the heat-dissipation aluminum extrusion includes a bottom plate and a side plate vertically connected with the bottom plate, a light guide plate is laminated on the side plate, the back plate is located between the light guide plate and the side plate, a groove is formed in the portion, corresponding to the light-in surface of the light guide plate, of the bottom plate, the LED light bar is accommodated in the groove, the thickness of the light-in surface of the light guide plate is larger than the width of the groove, protruding blocks on the two sides of the groove are used for limiting the light guide plate, even the light guide plate is expanded after being heated, the LED light bar is not damaged by ejector force of the light guide plate, the LED light bar is protected, meanwhile the optical coupling distance can be reduced, the light-in efficiency and brightness of the backlight module are improved, and the competitiveness of products is increased.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a side-entry backlight module and a liquid crystal display device. Background technique [0002] With the development of display technology, liquid crystal displays (Liquid Crystal Display, LCD) and other flat display devices are widely used in mobile phones, televisions, personal Various consumer electronic products such as digital assistants, digital cameras, notebook computers, and desktop computers have become the mainstream of display devices. [0003] Most of the liquid crystal display devices currently on the market are backlight liquid crystal displays, which include a liquid crystal display panel and a backlight module. The working principle of the liquid crystal display panel is to place liquid crystal molecules between two parallel glass substrates. There are many vertical and horizontal small wires between the two glass substrates. The direction of the liquid crysta...

AI Technical Summary

Problems solved by technology

[0005] like Figure 1 to Figure 2 As shown, the existing side-entry backlight module usually includes: heat dissipation aluminum extrusion 10, back plate 20, light guide plate 30, and LED light bar 40; wherein heat dissipation aluminum extrusion 10 is L-shaped, including: bottom plate 101, and The bottom plate 101 is vertically connected to the side plate 102, the two ends of the bottom plate 101 are respectively provided with a boss 103, the light guide plate 30 is set on the boss 103, and the LED light bar 40 is set on the bottom plate 101 is located in the region between the two bosses 103, the side plates 102, the back plate 20, and the light guide plate 30 are stacked sequentially along the width direction of the bottom plate 101; the light guide plate 30 only has support structures (convex platform 103), but in the length direction of the LED light bar 40, the long-distance part of the light guide plate 30 between the bosses 103 at both ends is completely hollowed out without any support and restrictions, because the side-entry type The LED light bar 40 in the light mode heats up seriously, and the light guide plate 30 will expand and deform after being heated. At this time, because the middle part of the light guide plate 30 has no restrictive structure, it will expand toward the LED lamp beads along the light incident direction after being heated, so it is very It is easy to damage the LED beads on the LED light bar 40. In order to prevent the LED lamp beads from being damaged, it is necessary to increase the height of the boss 103, but the increase of the height of the boss 103 will cause the optical coupling distance (OD) to be too large , leading to a decrease in light incident efficiency, thereby reducing the brightness of the backlight module

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