Backlight module and display device
By introducing light and dark masking elements into the backlight module, the problem of light leakage at the screen edges was solved, screen brightness uniformity was achieved, and the display effect of the display device was improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QISDA SUZHOU
- Filing Date
- 2025-06-11
- Publication Date
- 2026-05-08
AI Technical Summary
In existing technologies, backlight modules are prone to light leakage at the screen edges, resulting in uneven screen brightness.
Design a backlight module including a backplate, a light source module, a light guide plate, and a shielding component. The shielding component consists of a light-colored part and a dark-colored part. The light-colored part is adjacent to the bottom wall, and the dark-colored part is away from the bottom wall. It is used to absorb or reflect light and prevent light leakage at the edges.
It effectively prevents light leakage at the screen edges, ensures uniform screen brightness, and improves display performance.
Smart Images
Figure CN224216970U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to backlight modules and display devices, specifically to a backlight module and display device that improves corner light leakage. Background Technology
[0002] Some displays incorporate a backlight module, which typically includes a light guide plate (LGP). A gap exists between the light guide plate and the back panel sidewall of the backlight module due to fit tolerances. Light passing through the end face of the light guide plate is prone to uncontrolled scattering within this gap, leading to light leakage at the screen edges. Current technology uses a black shielding element between the back panel sidewall of the backlight module and the end face of the light guide plate to absorb excess light, but this results in the screen edges being dimmer than the center area.
[0003] Therefore, how to design a backlight module to solve the problem of light leakage at the edge of the screen while ensuring uniform screen brightness has become a new research topic. Utility Model Content
[0004] The purpose of this invention is to provide a backlight module and display device that solves the problem of light leakage at the edge of the screen and ensures uniform brightness of the screen.
[0005] To achieve the above objectives, this utility model provides a backlight module, comprising:
[0006] The back panel includes a side wall and a bottom wall, which enclose an inner cavity;
[0007] The light source module is located within this cavity;
[0008] A light guide plate is disposed within the cavity; and
[0009] A shielding element is disposed between the side wall and the light guide plate;
[0010] The shielding component includes a light-colored portion and a dark-colored portion, with the light-colored portion adjacent to the bottom wall and the dark-colored portion away from the bottom wall.
[0011] Preferably, the light-colored portion corresponds to the position of the light guide plate.
[0012] Preferably, it further includes a frame disposed on the outer side of the sidewall and extending across the free end of the sidewall and toward the inner side of the sidewall.
[0013] Preferably, the dark part is provided with a phosphor layer on the surface opposite to the bottom wall, and the dark part is located between the phosphor layer and the light part;
[0014] Alternatively, a phosphor layer may be provided on the surface of the light-colored portion opposite to the sidewall, and the phosphor layer may be located between the light-colored portion and the light guide plate.
[0015] More preferably, the light source module includes a blue light-emitting diode, and the phosphor layer is correspondingly a yellow phosphor layer.
[0016] Preferably, the shielding member is annular, and the shielding member is arranged in the inner cavity and fixed to the side wall.
[0017] Preferably, the shielding element is a two-color rubber ring;
[0018] The light-colored portion is white or gray, and the dark-colored portion is black.
[0019] More preferably, the light-colored portion and the dark-colored portion are integrally formed.
[0020] To achieve the above objectives, this utility model further provides a display device, comprising:
[0021] The liquid crystal panel has a light-emitting surface and a light-receiving surface; and
[0022] The aforementioned backlight module is disposed on the light-incident surface side of the liquid crystal panel.
[0023] More preferably, the edge of the liquid crystal panel has a black border area, and the shielding member of the backlight module is disposed within the vertical projection range of the black border area.
[0024] Compared with the prior art, the backlight module provided in the embodiments of this utility model is used to provide backlight for a display device. The backlight module includes a back plate, a light source module, a light guide plate, and a shielding member. The back plate has a side wall and a bottom wall, which together form an inner cavity. The light source module and the light guide plate are respectively disposed in the inner cavity. The shielding member is disposed between the side wall and the light guide plate. The shielding member includes a light-colored portion and a dark-colored portion, with the light-colored portion adjacent to the bottom wall and the dark-colored portion away from the bottom wall. Attached Figure Description
[0025] Figure 1 This is a schematic cross-sectional view of the display device in one embodiment of the present invention;
[0026] Figure 2 for Figure 1 Enlarged structural diagram of region A in the middle;
[0027] Figure 3 This is a schematic cross-sectional view of the display device in another embodiment of the present invention;
[0028] Figure 4 for Figure 3 A magnified structural diagram of region B in the middle. Detailed Implementation
[0029] To provide a better understanding of the purpose, structure, features, and functions of this utility model, detailed descriptions are provided below with reference to specific embodiments.
[0030] Certain terms are used in the specification and claims to refer to specific elements. It will be understood by those skilled in the art that manufacturers may use different names to refer to the same element. This specification and claims do not distinguish elements by differences in name, but rather by differences in function. The term "comprising" throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to".
[0031] Please see Figures 1 to 2 ,in, Figure 1 This is a partial structural diagram of the display device in one embodiment of the present invention. Figure 2 for Figure 1 A magnified structural diagram of region A in the figure. The display device provided by this utility model includes a housing (not shown in the figure), a backlight module, and a liquid crystal panel 21. The liquid crystal panel 21 has a light-emitting surface and a light-receiving surface. The light-emitting surface corresponds to the display surface of the display device and is used to generate an image for the user to view. The backlight module is disposed on the light-receiving surface side of the liquid crystal panel 21. In other words, the backlight module and the liquid crystal panel 21 are connected... Figure 1 The backlight module is arranged sequentially along the first direction S1 within the housing, where the first direction S1 is parallel to the normal of the display surface. The backlight module provides a uniform light source to illuminate the liquid crystal panel 21. The liquid crystal panel 21 has a pixel array, where the liquid crystal material exhibits optical anisotropy. By changing the arrangement of the liquid crystal material, the polarization direction of the incident light is adjusted accordingly, thereby presenting an image with varying brightness. In this embodiment, a filter 22 is also provided on the light-emitting surface side of the liquid crystal panel 21, but this is not a limitation. The filter 22 is typically divided into red, green, and blue (RBG) three-color layers. Each pixel consists of three sub-pixels, each covering a different color filter 22, which, when combined, achieves color display of the image. In this embodiment, the backlight module is fixed to the light-incident surface of the liquid crystal panel 21 using foam adhesive; in other embodiments, the backlight module and the liquid crystal panel 21 can also be fixedly connected by screws, clips, or other methods; however, practical applications are not limited to these methods.
[0032] The backlight module includes a backplate 11, a light source module (not shown), a light guide plate 12, and a shielding member 13. The backplate 11 has sidewalls 111 and a bottom wall 112, which together form an inner cavity 11s. Figure 1As shown, the fixed end 111a of the side wall 111 is fixedly connected to the bottom wall 112, that is, the back plate 11 is connected from... Figure 1 When viewed in the cross-sectional direction, it is U-shaped. In some embodiments, the bottom wall 112 can be integrally formed with the side wall 111; in other embodiments, the bottom wall 112 can also be independent of the side wall 111 and fixedly connected by means of adhesive, screws or other methods; however, the actual application is not limited to this.
[0033] The light source module and the light guide plate 12 are respectively disposed in the inner cavity 11s of the side wall 111. The light source module can be a light-emitting diode (LED) encapsulated on a circuit board. In this embodiment, the light source module is disposed on the side of the light guide plate 12, and the light emitted by the LED is refracted by the light guide plate 12 to generate uniform backlight. Preferably, a reflector 15 can also be disposed on the side of the light guide plate 12 near the bottom wall 112 to reflect light into the light guide plate 12, thereby improving the efficiency of the backlight. In other embodiments, the light source module can also be disposed directly below the light guide plate 12; for example, the LEDs can be arranged in an array below the light guide plate 12. In other words, the specific structure and arrangement of the light source module can be designed according to the actual application, and this utility model is not limited thereto; therefore, it is not specifically illustrated in the figures. Figure 2 As shown, the effective display area EA of the display device has a black border area (BM) on its outer side. In the figure, the black border area BM is separated from the effective display area EA by a dashed line. The black border area BM can serve as a wiring area for data signals and scan signals. The black border area BM provides physical space for the internal circuitry of the display device while hiding the circuit traces to maintain a clean appearance.
[0034] In a preferred embodiment, the backlight module further includes a frame 14, which is disposed on the outer side of the side wall 111 and extends across the free end 111b of the side wall 111 towards the inner side of the side wall 111. Figure 2 Taking the local structure shown as an example, a portion of the frame 14 extends from the free end 111b of the side wall 111 towards a second direction S2 perpendicular to the first direction S1. It should be noted that, since the side wall 111 is typically square-ring shaped, the second direction S2... Figure 2 The example shown is oriented to the right, but the inner side of the sidewall 111 is not entirely the same as the second direction S2, which will not be described again. Preferably, the frame 14 extends to a position where it overlaps with the equilateral corners of the light guide plate 12 to form a slot for fixing the light guide plate 12 and its surrounding components. In this embodiment, another part of the frame 14 can also extend from the free end 111b of the sidewall 111 in the opposite direction of the first direction S1 and fit tightly against the outer side of the sidewall 111, such as... Figure 2As shown, the frame 14 has an L-shaped cross-section, extending downwards and to the right from the free end 111b of the side wall 111, respectively, to strengthen the structural strength of the frame 14 and the side wall 111 and improve the reliability of the backlight module. However, practical applications are not limited to this. For example, the frame 14 and the side wall 111 can be fixedly connected by screws, snap-fit, welding, etc., and this utility model is not limited to this.
[0035] In a preferred embodiment, such as Figure 1 As shown, the liquid crystal panel 21 is fixedly connected to the frame 14. Preferably, the portion of the liquid crystal panel 21 corresponding to the black border area BM of the display device is fixedly connected to the frame 14; in other words, the frame 14 corresponds to the black border area BM of the display device.
[0036] like Figure 1 and Figure 2 As shown, the shielding member 13 is disposed between the side wall 111 and the light guide plate 12 to absorb light overflowing from the side end face of the light guide plate 12 or reflect the light back to the effective display area (EA) of the display device, preventing light leakage at the edges of the display device. The shielding member 13 includes a light-colored portion 13a and a dark-colored portion 13b, with the light-colored portion 13a adjacent to the bottom wall 112 and the dark-colored portion 13b away from the bottom wall 112. Preferably, the shielding member 13 is disposed within the vertical projection range of the black border area BM.
[0037] In a preferred embodiment, the shielding member 13 is a two-color rubber ring. The light-colored portion 13a is white or gray, and the dark-colored portion 13b is black. Preferably, the light-colored portion 13a and the dark-colored portion 13b are injection molded and then filled with different colored pigments to form a single piece; alternatively, the shielding member 13 is injection molded as a single light-colored rubber ring, and an anti-reflective layer made of black ink is applied to the corresponding position of the dark-colored portion 13b; in other embodiments, the light-colored portion 13a and the dark-colored portion 13b can also be molded separately and then fixedly connected by adhesive or other means; this invention is not limited to these embodiments.
[0038] like Figure 2 As shown, some light leaks out from the side end face of the light guide plate 12. The first part of the light shines on the light-colored part 13a and is reflected by the light-colored part 13a, and then propagates to the effective display area EA, so that the edge of the display screen seen by the user has sufficient backlight brightness, and avoids the edge of the display screen being darker than its center area. The second part of the light shines on the dark part 13b and is absorbed or reflected by the dark part 13b. That is to say, the second part of the light will not propagate to the black border area BM, avoiding light leakage in the black border area BM, which would cause the edge of the display device to be too bright or have bright lines.
[0039] In a preferred embodiment, such as Figure 1 and Figure 2 As shown, a phosphor layer 13c is provided on the surface of the dark portion 13b opposite to the bottom wall 112, and the dark portion 13b is located between the phosphor layer 13c and the light portion 13a. Preferably, the phosphor layer 13c can be printed on the dark portion 13b, but practical applications are not limited to this. In another preferred embodiment, such as... Figure 3 and Figure 4 As shown, a phosphor layer 13c is provided on the surface of the light-colored portion 13a opposite to the sidewall 111, and the phosphor layer 13c is located between the light-colored portion 13a and the light guide plate 12. Preferably, the phosphor layer 13c can be printed on the light-colored portion 13a, but practical applications are not limited to this. In this embodiment, as... Figure 3 and Figure 4 As shown, the surface of the light-colored portion 13a used for printing the phosphor layer 13c can be recessed inward relative to the dark-colored portion 13b to create a groove for printing the phosphor layer 13c. In this case, the portion of the dark-colored portion 13b that protrudes relative to the light-colored portion 13a in the second direction S2 can still absorb light. The dark-colored portion 13b can be flush with the phosphor layer 13c; in other words, the thickness of the dark-colored portion 13b in the second direction S2 is equal to the combined thickness of the light-colored portion 13a and the phosphor layer 13c. Alternatively, the dark-colored portion 13b can also protrude relative to the phosphor layer 13c; in other words, the thickness of the dark-colored portion 13b in the second direction S2 is greater than the combined thickness of the light-colored portion 13a and the phosphor layer 13c. However, practical applications are not limited to this. Preferably, the light source module includes a blue light-emitting diode (LED) and a yellow phosphor layer 13c. This allows blue light refracted from the side end face of the light guide plate 12 to be converted into white light by the yellow phosphor layer 13c before propagating to the effective display area EA, further resolving the issue of bluish edges in the displayed image. In other embodiments, the light source module may also include LEDs of other colors, with the color of the phosphor layer 13c corresponding to the emission color of the LEDs in the light source module to obtain white light. This invention is not limited to these embodiments.
[0040] In a preferred embodiment, such as Figures 1 to 2 As shown, the light-colored portion 13a corresponds to the position of the light guide plate 12. In this embodiment, the width of the light-colored portion 13a in the first direction S1 is greater than or equal to the thickness of the light guide plate 12. In other words, the width range of the light-colored portion 13a in the first direction S1 completely covers the thickness range of the light guide plate 12, so that the light-colored portion 13a fully reflects the first portion of light described above to the display area. Preferably, at the junction of the light-colored portion 13a and the dark-colored portion 13b, in the first direction S1, it is closer to the liquid crystal panel 21 than the light guide plate 12. In other words, at... Figure 1 and Figure 2In the direction shown, the junction is located above the upper surface of the light guide plate 12; or, the junction is at least adjacent to the light guide plate 12 at... Figure 1 and Figure 2 The upper surface shown is flush; however, practical applications are not limited to this.
[0041] In a preferred embodiment, the shielding member 13 is annular corresponding to the side wall 111, and is arranged in a ring around the inner cavity 11s and fixed to the side wall 111. In other preferred embodiments, the shielding member 13 may also be multiple independent strip-shaped pads, respectively fixed to the inner side of each side of the side wall 111, and this utility model is not limited thereto. In this embodiment, the shielding member 13 is fixed to the inner side of the side wall 111 by means of pasting, snap-fitting, etc.; in other embodiments, the shielding member 13 may also be pasted to the bottom wall 112; however, the actual application is not limited to this.
[0042] In summary, the backlight module provided by the embodiments of this utility model is used to provide backlight for a display device. The backlight module includes a back plate, a light source module, a light guide plate, and a shielding member. The back plate has a side wall and a bottom wall, which together form an inner cavity. The light source module and the light guide plate are respectively disposed in the inner cavity. The shielding member is disposed between the side wall and the light guide plate. The shielding member includes a light-colored portion and a dark-colored portion, with the light-colored portion adjacent to the bottom wall and the dark-colored portion away from the bottom wall.
[0043] This utility model has been described by the above-described embodiments; however, these embodiments are merely examples for implementing this utility model. It must be noted that the disclosed embodiments do not limit the scope of this utility model. Conversely, any modifications and refinements made without departing from the spirit and scope of this utility model are within the scope of patent protection of this utility model.
Claims
1. A backlight module for providing backlight for a display device, characterized in that, include: The back panel includes a side wall and a bottom wall, which enclose an inner cavity; The light source module is located within this cavity; A light guide plate is disposed in this inner cavity; as well as A shielding element is disposed between the side wall and the light guide plate; The shielding component includes a light-colored portion and a dark-colored portion, with the light-colored portion adjacent to the bottom wall and the dark-colored portion away from the bottom wall.
2. The backlight module according to claim 1, characterized in that, The light-colored part corresponds to the position of the light guide plate.
3. The backlight module according to claim 1, characterized in that, It also includes a frame that is disposed on the outside of the sidewall and extends across the free end of the sidewall and toward the inside of the sidewall.
4. The backlight module according to claim 1, characterized in that, The dark part is provided with a phosphor layer on the surface opposite to the bottom wall, and the dark part is located between the phosphor layer and the light part; Alternatively, a phosphor layer may be provided on the surface of the light-colored portion opposite to the sidewall, and the phosphor layer may be located between the light-colored portion and the light guide plate.
5. The backlight module according to claim 4, characterized in that, The light source module includes a blue light-emitting diode, and the corresponding phosphor layer is a yellow phosphor layer.
6. The backlight module according to claim 1, characterized in that, The shielding component is ring-shaped, and it is arranged in the inner cavity and fixed to the side wall.
7. The backlight module according to claim 1, characterized in that, The shielding component is a two-color rubber ring; The light-colored portion is white or gray, and the dark-colored portion is black.
8. The backlight module according to claim 7, characterized in that, The light-colored part and the dark-colored part are integrally molded.
9. A display device, characterized in that, include: The LCD panel has a light-emitting surface and a light-receiving surface; as well as The backlight module according to any one of claims 1 to 8, wherein the backlight module is disposed on the light-incident surface side of the liquid crystal panel.
10. The display device according to claim 9, characterized in that, The LCD panel has a black border area at its edge, and the shielding component of the backlight module is located within the vertical projection range of the black border area.