LCD with function of preventing light leak, and backlight module

[0036] Figure 4 Shown is a schematic cross-sectional view of an embodiment of the liquid crystal display of the present invention. The liquid crystal display 2 includes: a liquid crystal panel 21 and a backlight module 22.

[0037] The liquid crystal panel 21 has an upper substrate 211 and a lower substrate 212. According to whether to display images, the upper and lower surfaces of the liquid crystal panel are divided into a display surface A1 and a non-display surface A2. The user views the image through the display surface A1 to obtain the required information. In addition, an opaque frame 2111 is provided on the surface of the upper substrate 211 of the liquid crystal panel 21.

[0038] The backlight module 22 further includes: a light guide plate 221, a light source 222 and a frame 223.

[0039] The light guide plate 221 is disposed on the non-display surface side of the liquid crystal panel 21, that is, on the same side as the non-display surface A2 of the liquid crystal panel 21 and below the lower substrate 212. Various optical films can be added to the light guide plate to provide uniform light. After being incident from the non-display surface A2 of the liquid crystal panel, the image is formed on the display surface A1.

[0040] The light source 222 is arranged on one side of the light guide plate, for example, on the side or bottom side of the light guide plate 221. The light emitted by the light source 222 is emitted through the light guide plate 221.

[0041] The frame 223 is used to accommodate the light guide plate 221 and the light source 222. In this embodiment, the frame 223 is a rectangular hollow box. Of course, in other embodiments, the frame 223 may also be a hollow rectangular frame body, and the ring sleeve is arranged on the periphery of the light guide plate 221.

[0042] Furthermore, the inner edge of the frame 223 gradually rises like a step, and the level of the inner edge can be used to carry the liquid crystal panel 21.

[0043] In an embodiment of the present invention, the inner edge of the frame 223 has a light-shielding structure 24 located on the non-display surface side of the liquid crystal display panel to prevent light from escaping to the outside. In a preferred situation, the light-shielding structure 24 is integrally formed with the frame as a flange extending from the side wall of the inner edge of the frame 223, and the light-shielding structure 24 can further overlap with a part of the light exit surface of the light guide plate 221. Of course, the liquid crystal panel 21 can also be placed on this flange.

[0044] The flange is used to block the light of the light guide plate 221 traveling toward the edge of the liquid crystal panel 21, so as to prevent the light from escaping.

[0045] Figure 5 Shown is a schematic cross-sectional view of another embodiment of the present invention. Figure 5 versus Figure 4 The difference is that: in this embodiment, the inner edge of the frame 223 has a light guide structure at the step transition. In this embodiment, the light guide structure is an oblique cross section 25, such as Figure 5 As shown, when the light scattered from the light guide plate 221 enters the surface of the oblique section 25, it is reflected and guided to the frame 2111 of the liquid crystal panel 21 without leaking to the outside. In order to enhance the light guiding effect, the light guiding structure is not limited to the oblique cross section 25. Any design capable of reflecting light belongs to the protection scope of the present invention, such as a flat surface or a concave curved surface.

[0046] It is worth noting that the light guide structure located at the inner edge of the frame 223 is not limited to the foregoing embodiment.

[0047] Figure 6 Shown is a schematic cross-sectional view of another embodiment of the present invention. Figure 6 versus Figure 4 The difference shown is that: in this embodiment, the light guide structure on the inner edge of the frame 223 will face the stepped inner edge of the frame 223 at the liquid crystal panel 21, after being roughened, the light guide structure is a rough surface. 26. Such as Figure 6 As shown, when the light scattered by the light guide plate 221 toward the edge of the liquid crystal panel 21 hits the light guide structure, the light is affected by the rough surface 26 and diffused and reflected, so that the light travels in a non-specific direction, and it is not easy to escape to the outside world, and it can prevent The effect of light leakage.

[0048] In addition, in order to achieve a better effect of preventing light leakage, the surface of the light guide structure or the surface of the light shielding structure in the above embodiments can also be coated with black paint or light absorbing material to increase the ability of the surface to absorb light and reduce the effect of light reflection. brightness.

[0049] You can even Figure 4 versus Figure 6 Combine like Figure 7 Shown is a schematic diagram of another embodiment of the present invention. Wherein, the frame 223 has a light-shielding structure 24, and the upper surface of the light-shielding structure 24 is a light guide structure 26 with a rough surface, which has two functions at the same time.

[0050] It can be seen from the above embodiments that the present invention only needs to use a simple module design when manufacturing the frame, so that the inner edge of each frame has the required structure, and the problem of light leakage in the liquid crystal display is improved. Compared with the prior art method of pasting the light-shielding tape on the liquid crystal panel, the present invention can greatly save the labor cost of pasting the light-shielding tape, it can also reduce the assembly steps required by the process, save the assembly time and increase the production efficiency. It can eliminate the defects that may be caused by the pasting of the shading tape in the prior art.

[0051] Those skilled in the art can clearly understand the spirit and various advantages or functional applications of the present invention after reading the specification and various embodiments of the present invention. The above preferred implementations are only used to describe the implementation process of the present invention in detail, and are not used to limit the protection scope of the present invention. Appropriate modifications made according to the present invention still do not depart from the spirit and protection scope of the present invention.