CN114815380A - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN114815380A CN114815380A CN202110116852.7A CN202110116852A CN114815380A CN 114815380 A CN114815380 A CN 114815380A CN 202110116852 A CN202110116852 A CN 202110116852A CN 114815380 A CN114815380 A CN 114815380A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133608—Direct backlight including particular frames or supporting means
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a backlight module and a display device, wherein the backlight module comprises a bottom plate and a plurality of light-emitting units. The bottom plate has a plurality of recesses, and at least one recess has a bottom opening. The plurality of light emitting units are respectively arranged in the plurality of grooves, and the plurality of light emitting units have inclination angles towards the plane center of the bottom plate. Wherein, along the direction of the plane center of the bottom plate towards the side of the bottom plate, the inclination angles of the plurality of light-emitting units are gradually increased. Therefore, the light collection performance and the light source use efficiency of the display device with the backlight module can be improved.
Description
Technical Field
The present invention relates to a backlight module and a display device, and more particularly, to a backlight module including a special light emitting unit receiving bottom plate and having a specific distribution design of an inclination angle of the light emitting unit, and a display device having the backlight module.
Background
The display device using the light emitting diode mainly has two types, the first type is to configure the light emitting diode with the corresponding color for each sub-pixel, which has the advantage of omitting the use of the backlight module, but the main problems of high production cost and low resolution for this type of display device are not entered into a large number of commercialization stages at present. In addition, the light emitting diode is used as a light source of the backlight module, and compared with the conventional backlight module using a cold cathode fluorescent lamp, the light emitting module using the light emitting diode has the advantages of low driving voltage, small size and the like, but how to further increase the light source use efficiency and the service life of the backlight module is still a target addressed by related industries.
Disclosure of Invention
An objective of the present invention is to provide a backlight module, which has a special bottom plate for accommodating light-emitting units, and the tilt angles of the light-emitting units have a specific distribution design, so as to effectively improve the light-collecting performance and the light source utilization efficiency of the backlight module. Another objective of the present invention is to provide a display device having the backlight module.
The invention provides a backlight module, which comprises a bottom plate and a plurality of light-emitting units. The bottom plate has a plurality of recesses, and at least one recess has a bottom opening. The plurality of light emitting units are respectively arranged in the plurality of grooves and have an inclination angle towards the plane center of the bottom plate. The inclination angles of the plurality of light emitting units gradually increase in a direction toward the side of the base plate along the center of the plane of the base plate.
According to an embodiment of the present invention, the inclination angle of the light emitting unit is 16 degrees to 55 degrees.
According to still another embodiment of the present invention, the base plate has a first region, a second region surrounding the first region, and a third region surrounding the second region, the luminance of the light emitting cells in the second region is greater than the luminance of the light emitting cells in the first region, and the luminance of the light emitting cells in the third region is greater than the luminance of the light emitting cells in the second region.
According to yet another embodiment of the present invention, the outer length and the outer width of the second region are about 70% to 80% of the outer length and the outer width of the third region, respectively, and the length and the width of the first region are about 30% to 40% of the outer length and the outer width of the third region, respectively.
According to yet another embodiment of the present invention, a sidewall of at least one of the plurality of grooves has at least one of a stepped shape, an inclined shape, and a curved shape.
According to yet another embodiment of the invention, the vertical cross-sectional profile of at least one groove of the plurality of grooves is asymmetric.
According to yet another embodiment of the invention, the bottom opening of at least one of the plurality of grooves is rectangular or circular.
According to another embodiment of the present invention, each of the light emitting units corresponds to at least one pixel unit of the display panel.
The invention further provides a display device, which comprises a display panel and a backlight module. The backlight module is located on the opposite side of the display surface of the display panel and comprises an opaque bottom plate, a plurality of light emitting units and at least one optical film layer. The opaque floor has a plurality of grooves, and at least one groove has a bottom opening. The plurality of light emitting units are respectively arranged in the grooves and have inclination angles towards the plane center of the opaque bottom plate. The optical film layer is arranged above the opaque bottom plate and the plurality of light emitting units. The inclination angle of the light emitting unit gradually increases in a direction toward the side of the opaque chassis from the center of the plane of the opaque chassis.
The invention further provides a display device, which comprises a display panel and a backlight module. The backlight module is located on the opposite side of the display surface of the display panel and comprises a transparent bottom plate and a plurality of light emitting units. The transparent bottom plate has a plurality of grooves, and at least one groove has a bottom opening. The plurality of light emitting units are respectively arranged in the plurality of grooves and have an inclination angle towards the plane center of the transparent bottom plate. The inclination angles of the plurality of light emitting units gradually increase in a direction toward the side of the transparent base plate along the center of the plane of the transparent base plate.
Compared with the prior art, the invention has the following beneficial effects: the backlight module and the display device have the special light-emitting unit accommodating bottom plate, and the inclination angles of the light-emitting units have specific distribution design, so that the light collection performance and the light source use efficiency of the backlight module can be effectively improved.
Drawings
For a more complete understanding of the embodiments and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a partial cross-sectional view of a display device according to an embodiment of the invention;
FIG. 2A is a schematic diagram illustrating an example of a perspective view of the light emitting unit and the groove in FIG. 1;
FIG. 2B is a cross-sectional view corresponding to the perspective view shown in FIG. 2A;
FIG. 3A is another exemplary diagram of a perspective view of the light emitting unit and the groove of FIG. 1;
FIG. 3B is a cross-sectional view corresponding to the perspective view shown in FIG. 3A;
FIG. 4A is a schematic diagram of another example of a perspective view of the light emitting unit and the groove of FIG. 1;
FIG. 4B is a cross-sectional view corresponding to the perspective view shown in FIG. 4A;
fig. 5 and 6 are different exemplary schematic views of perspective views of the light emitting unit and the groove of fig. 1, respectively;
FIG. 7 is a schematic diagram of the light emitting unit in the structure shown in FIG. 2A performing front emission and side emission;
fig. 8A and 8B are schematic views of front light emission when the light emitting units have different tilt angles, respectively;
FIG. 9 is a schematic view of the display panel of FIG. 1;
FIG. 10 is a schematic view illustrating a distribution of tilt angles of respective light emitting units in the backlight module of FIG. 1;
FIG. 11A is a schematic diagram showing the distribution of the tilt angles of the light-emitting units on the X axis of the backlight module of FIG. 1 when they are located on the same Y axis standard;
FIG. 11B is a schematic diagram showing the distribution of the tilt angles of the light-emitting units on the same X-axis coordinate in the backlight module of FIG. 1;
fig. 12 is a partial cross-sectional view of a display device according to another embodiment of the present invention;
fig. 13A to 13C are schematic views of a light emitting unit and a groove corresponding to each pixel in the display device of fig. 12.
Description of the main reference numerals:
100A, 100B-display device, 110-display panel, 120-backlight module, 122-bottom plate, 122A-groove, 122C 1-arc step-shaped side wall, 122E1,122E2,122E2 '-step-shaped side wall, 122E3,122E3' -inclined plane step-shaped side wall, 122E 4-comb-shaped side wall, 124-circuit board, 126-light-emitting unit, 128-rubber frame, 130-optical film layer, theta 1 、θ 2 -oblique angle, AA 1-first area, AA 2-second area, AA 3-third area, B-blue sub-pixel, G-green sub-pixel, PA-peripheral area, R-red sub-pixel.
Detailed Description
Embodiments of the invention are discussed in detail below. It should be appreciated, however, that the embodiments provide many applicable concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed are merely illustrative and do not limit the scope of the invention.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the claims. The singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, the spatially relative terms are used to describe various orientations of the elements in use or operation and are not intended to be limited to the orientations shown in the figures. Elements may also be oriented in other ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted in a similar manner.
Reference numerals and/or letters may be repeated among the various embodiments for simplicity and clarity of illustration, but are not intended to indicate a resulting relationship between the various embodiments and/or configurations discussed.
Fig. 1 is a partial cross-sectional view of a display device 100A according to an embodiment of the invention. The display device 100A includes a display panel 110, a backlight module 120, and an optical film layer 130. The display panel 110 may be various types of liquid crystal display panels such as a Twisted Nematic (TN) type, an in-plane switching (IPS) type, an FFS (fringe-field switching) type, or a VA (vertical alignment) type. The backlight module 120 is disposed on the opposite side of the display surface of the display panel 110 and is used for providing light to the display panel 110. As shown in fig. 1, the backlight module 120 includes a bottom plate 122, a circuit board 124, a light emitting unit 126, and a rubber frame 128. In the display device 100A, the bottom plate 122 is an opaque bottom plate, and the material thereof includes, for example, plastic, resin, metal, or other suitable opaque material. The bottom plate 122 forms a plurality of grooves 122A, wherein at least one groove 122A has bottom openings (not shown in the drawings), the bottom openings are covered by the circuit board 124, and the light emitting units 126 are disposed on the circuit board 124 and respectively located in the grooves 122A and are used for providing light sources (for example, white light). The light emitting unit 126 may be disposed on the circuit board 124 by soldering or adhering, and the circuit board 124 has wirings electrically connected to the positive and negative electrodes of the light emitting unit 126, respectively. The light emitting unit 126 may be a packaged led die, which may be formed by flip-chip (flip-chip) packaging, chip scale packaging (chip scale package) or other suitable packaging methods. If the light emitting unit 126 is a packaged led die, it may have a main light emitting surface and four side light emitting surfaces. In addition, the light emitting units 126 may be sub-millimeter light emitting diode (mini LED) dies or micro LED dies (micro LED), and each light emitting unit 126 may correspond to at least one pixel unit of the display panel 110.
The backlight module 120 further includes an optical film 130, and the frame 128 is disposed on the bottom plate 122 and surrounds the display panel 110 and the optical film 130, and is used for fixing the positions of the display panel 110 and the optical film 130. The glue frame 128 may be made of a low-reflectivity opaque material, such as black resin; or a highly reflective opaque material such as a white plastic frame. The optical film layer 130 is disposed above the bottom plate 122 and the light emitting unit 126 and below the display panel 110, i.e., between the light emitting unit 126 and the display panel 110, and may be formed by stacking one or more films on top of another, and may include, for example, a diffusion film and/or a brightness enhancement film, but is not limited thereto. In addition, the backlight module 120 may be covered by a frame (not shown), and a reflective film (not shown) may be disposed on the circuit board 124 to reflect light emitted from the light emitting unit 126.
In the display device 100A, since the light emitting units 126 do not emit light from the same angle and the same plane, the light emitting units 126 can have an inclination angle with respect to the plane direction of the bottom plate 122 to adjust the light emitting mode and the light traveling path, so as to avoid the problems on the image display, such as the generation of the surrounding dark bands or bright bands. Further, the shape of the groove 122A in the bottom plate 122 may also be designed according to the material of the bottom plate 122, the characteristics of the light emitting unit 126, and the like.
Fig. 2A is an exemplary schematic diagram of a perspective view of the light emitting unit 126 and the groove 122A in fig. 1. As shown in fig. 2A, the bottom opening of the groove 122A is rectangular, and one of the sidewalls of the groove 122A is a stepped sidewall 122E1, while the other three sidewalls are vertical sidewalls. Fig. 2B is a cross-sectional view corresponding to the perspective view shown in fig. 2A. Since the light emitting unit 126 is inclined toward the planar center of the bottom plate 122 and the stepped side wall 122E1 is a side wall of the groove 122A closer to the planar center of the bottom plate 122, a main light emitting surface of the light emitting unit 126 is inclined toward the stepped side wall 122E1 as viewed in a sectional view shown in fig. 2B.
Fig. 3A is another exemplary schematic diagram of a perspective view of the light emitting unit 126 and the groove 122A in fig. 1. As shown in fig. 3A, the bottom opening of the groove 122A is rectangular, and all the sidewalls of the groove 122A are stepped sidewalls 122E 2. Fig. 3B is a cross-sectional view corresponding to the perspective view shown in fig. 3A. Since the light emitting unit 126 is inclined toward the center of the plane of the bottom plate 122, a main light emitting surface of the light emitting unit 126 is inclined toward the stepped side wall 122E 2' closer to the center of the plane of the bottom plate 122 in the groove 122A, as viewed in the sectional view shown in fig. 3B.
Fig. 4A is a schematic diagram illustrating another example of a perspective view of the light emitting unit 126 and the groove 122A in fig. 1. As shown in fig. 4A, the bottom opening of the groove 122A is rectangular, and all the sidewalls of the groove 122A are the inclined stepped sidewalls 122E 3. Fig. 4B is a cross-sectional view corresponding to the perspective view shown in fig. 4A. Since the light emitting unit 126 is inclined toward the center of the plane of the bottom plate 122, a main light emitting surface of the light emitting unit 126 is inclined toward the inclined stepped side wall 122E 3' closer to the center of the plane of the bottom plate 122 in the groove 122A, as viewed in the sectional view shown in fig. 4B.
Fig. 5 and 6 are different schematic diagrams illustrating perspective views of the light emitting unit 126 and the groove 122A in fig. 1, respectively. As shown in fig. 5, the groove 122A has four sidewalls, three of which are flat sidewalls, and the other of which is a comb-shaped sidewall 122E 4. The lower half and the upper half of the comb-shaped side wall 122E4 have a comb-shaped structure and a plurality of lenticular-shaped structures, respectively. In addition, in another embodiment, as shown in fig. 6, the bottom opening of the groove 122A is circular, and half of the sidewall thereof has an arc-shaped stepped sidewall 122C 1. In the example of fig. 5 and 6, the main light emitting surface of the light emitting unit 126 is inclined toward the comb-shaped side wall 122E4 or the arc-shaped stepped side wall 122C1 in the groove 122A.
In some embodiments, the vertical cross-sectional profile of at least one groove 122A of the bottom plate 122 is asymmetric, such as the groove 122A shown in fig. 2A-2B, 5, 6. The non-flat sidewall is the sidewall of the recess 122A closer to the planar center of the bottom plate 122 to increase the amount of light collection to the central area of the display panel 110.
Fig. 7 is a schematic diagram of the light emitting unit 126 performing front light emission and side light emission in the structure shown in fig. 2A. As shown in fig. 7, since the light emitting unit 126 is inclined to the right, both the front light-exiting area and the side light-exiting area thereof are shifted to the right. Further, fig. 8A and 8B are schematic views of front light emission (i.e., main light emission surface light emission path) when the light emitting unit 126 has different inclination angles, respectively. When the inclination angles of the light emitting units 126 are theta 1 、θ 2 In this case, the directions of the light emitted from the main light emitting surface of the light emitting unit 126 are also different. As can be seen from FIGS. 8A and 8B, when the angle of inclination θ is set 2 Greater than the angle of inclination theta 1 At this time, the light emitted from the main light emitting surface of the light emitting unit 126 is also gradually shifted to the right.
Fig. 9 is a schematic diagram of each partition of the backlight module 120 of fig. 1. As shown in fig. 9, the backlight module 120 has a first area AA1, a second area AA2, a third area AA3, and a peripheral area PA, wherein the first area AA1, the second area AA2, and the third area AA3 correspond to an active area of the display panel 110, and the peripheral area PA corresponds to a peripheral area of the display panel 110. The first area AA1, the second area AA2, and the third area AA3 are collectively referred to as a light-emitting area. The second area AA2 surrounds the first area AA1, the third area AA3 surrounds the second area AA2, the luminance of the light emitting cells 126 in the second area AA2 is greater than that of the light emitting cells 126 in the first area AA1, and the luminance of the light emitting cells 126 in the third area AA3 is greater than that of the light emitting cells 126 in the second area AA 2. In some embodiments, the outer length and outer width of the second area AA2 are approximately 70% to 80% of the outer length and outer width, respectively, of the third area AA3, and the length and width of the first area AA1 are approximately 30% to 40% of the outer length and outer width, respectively, of the third area AA 3.
Since the light emitting units 126 may have different light emitting efficiencies due to process variations, the light emitting luminance may be different, and thus, when the light emitting units 126 are assembled, if the light emitting units 126 with different light emitting efficiencies are randomly arranged on the circuit board 124 of the backlight module 120, problems of insufficient brightness in a bright area, insufficient darkness in a dark area, defective contrast and/or insufficient color saturation in color and taste of the display device 100 may be caused. The above problem can be further improved by the relative luminance configurations of the light emitting units 126 corresponding to the respective areas AA1-AA3 of the backlight module 120 of fig. 9.
Fig. 10 shows a tilt angle distribution diagram of each light-emitting unit 126 in the backlight module 120 of fig. 1, wherein an area formed by the direction X, Y represents a light-emitting region of the backlight module 120, and the directions X, Y are a length direction and a width direction of the light-emitting region, respectively. If the lower left corner of the light-emitting region is the origin, the X-axis coordinate and the Y-axis coordinate of the light-emitting unit 126 in the tilt angle distribution diagram are the components of the distance from the origin in the direction X, Y. As shown in fig. 10, the light emitting units 126 corresponding to the four corners of the light emitting region have the maximum inclination angle, and the light emitting units 126 corresponding to the central region of the light emitting region have the minimum inclination angle. In the present invention, the maximum and minimum inclination angles of the light emitting unit 126 are about 55 degrees and 16 degrees, respectively.
Fig. 11A shows a tilt angle distribution diagram of each light-emitting unit 126 located at the same Y-axis coordinate in the backlight module 120 of fig. 1, wherein the horizontal axis is the percentage of the X-axis coordinate of the light-emitting unit 126 in the tilt angle distribution diagram divided by the light-emitting region length of the backlight module 120, and the vertical axis represents the corresponding tilt angle of the light-emitting unit 126. According to the tilt angle distribution diagram shown in fig. 11A, on the same Y-axis coordinate, the light emitting units 126 closer to the middle point of the light emitting region length of the backlight module 120 have smaller tilt angles; conversely, the light emitting units 126 closer to the end of the light emitting area length of the backlight module 120 have larger tilt angles. It is to be noted that the lower limit value and the upper limit value of the inclination angle range shown in fig. 11A are not lower than 16 degrees and 25 degrees, respectively, and neither is higher than 55 degrees at the maximum.
Fig. 11B shows a tilt angle distribution diagram of each light-emitting unit 126 located at the same X-axis coordinate in the backlight module 120 of fig. 1, wherein the horizontal axis is a percentage of the Y-axis coordinate of the light-emitting unit 126 in the tilt angle distribution diagram divided by the width of the light-emitting region of the backlight module 120, and the vertical axis represents the corresponding tilt angle of the light-emitting unit 126. According to the tilt angle distribution diagram shown in fig. 11B, on the same X-axis coordinate, the light emitting units 126 closer to the middle point of the light emitting region width of the backlight module 120 have smaller tilt angles; conversely, the light emitting units 126 closer to the end of the width of the light emitting region of the backlight module 120 have larger tilt angles. It is to be noted that the lower limit value and the upper limit value of the inclination angle range shown in fig. 11B are not lower than 16 degrees and 27.5 degrees, respectively, and neither is higher than 55 degrees at the maximum.
The variation of the tilt angle of the light emitting unit 126 of the present invention can be adjusted according to the display characteristics of the display panel 110. For example, if the periphery of the display frame of the display panel 110 is a bright band, such as an outer frame made of a material with low absorbance or high refractive index, the inclination angle of the light emitting unit 126 can be changed greatly, so that the light emitted by the light emitting unit 126 can be further focused toward the center of the display panel 110; if the periphery of the display screen of the display panel 110 is a dark band, for example, an outer frame made of a material with high light absorption rate or low refractive index, the change of the tilt angle of the light emitting unit 126 can be small.
Fig. 12 is a partial cross-sectional view of a display device 100B according to another embodiment of the invention. The display device 100B is different from the display device 100A of fig. 1 in that the display device 100B does not have the optical film layer 130, and in the display device 100B, the bottom plate 122 is a transparent bottom plate made of a material such as glass, acrylic or other suitable transparent materials, and the shape of each groove 122A is also different from the shape of the groove in the display device 100A. The remaining elements may be similar to those in the display device 100A, and thus the description thereof is omitted. Since the display device 100B does not have the optical film layer 130, the thickness of the display device 100B may be thinner than that of the display device 100A.
The shape of the side of the groove 122A may be designed according to the size of the display device and the requirement of the uniformity of the light source of the display panel 110. Fig. 13A to 13C are schematic diagrams of the light emitting unit 126 and the groove 122A corresponding to each pixel in the display device of fig. 12, but not limited thereto, wherein each light emitting unit 126 may correspond to at least one pixel unit of the display panel 110. Fig. 13A to 13C are schematic diagrams each of which uses one pixel of the display panel 110 as a unit, and includes a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B, and two opposite sides of the groove 122A are asymmetric. The left side edges shown in fig. 13A to 13C are all curved side edges. In contrast, the right side shown in FIG. 13A is a step plus ramp side, the right side shown in FIG. 13B is a two-level radiused step plus ramp side, and the right side shown in FIG. 13C is a ramp side. Wherein the right side shown in fig. 13A-13C is the side wall of the recess 122A closer to the planar center of the bottom plate 122.
As can be seen from the above description, the special design of the inclined angle distribution between the bottom plate groove of the light-emitting unit and the light-emitting unit of the embodiment of the invention can effectively improve the light collection performance and the light source utilization efficiency of the backlight module.
Although the present disclosure has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present disclosure, and therefore, the scope of the present disclosure is to be defined by the appended claims.
Claims (10)
1. A backlight module, comprising:
a bottom plate having a plurality of grooves, at least one of the grooves having a bottom opening; and
a plurality of light emitting units respectively disposed in the plurality of grooves, the plurality of light emitting units having an inclination angle toward a center of a plane of the base plate;
wherein the inclination angles of the plurality of light emitting units are gradually increased in a direction toward the side of the base plate along the center of the plane of the base plate.
2. The backlight module of claim 1, wherein the plurality of light emitting units have a tilt angle of 16 to 55 degrees.
3. The backlight module of claim 1, wherein the chassis base has a first region, a second region surrounding the first region, and a third region surrounding the second region, the luminance of the light emitting cells in the second region is greater than the luminance of the light emitting cells in the first region, and the luminance of the light emitting cells in the third region is greater than the luminance of the light emitting cells in the second region.
4. The backlight module of claim 3, wherein the outer length and the outer width of the second region are 70% to 80% of the outer length and the outer width of the third region, respectively, and the length and the width of the first region are 30% to 40% of the outer length and the outer width of the third region, respectively.
5. The backlight module of claim 1, wherein a sidewall of at least one of the plurality of grooves has at least one of a step shape, an inclined shape, and a curved shape.
6. The backlight module of claim 1, wherein a vertical cross-sectional profile of at least one of the plurality of grooves is asymmetric.
7. The backlight module of claim 1, wherein a bottom opening of at least one of the plurality of grooves is rectangular or circular.
8. The backlight module of claim 1, wherein each of the light emitting units corresponds to at least one pixel unit of the display panel.
9. A display device, comprising:
a display panel; and
a backlight module located on an opposite side of a display surface of the display panel, the backlight module comprising:
an opaque bottom plate having a plurality of recesses, at least one of the recesses having a bottom opening;
a plurality of light emitting units respectively disposed in the plurality of grooves, the plurality of light emitting units having an inclination angle toward a center of a plane of the opaque chassis; and
at least one optical film layer disposed over the opaque base plate and the plurality of light emitting cells;
wherein the inclination angles of the plurality of light emitting units gradually increase in a direction from the center of the plane of the opaque chassis toward the side of the opaque chassis.
10. A display device, comprising:
a display panel; and
a backlight module located on an opposite side of a display surface of the display panel, the backlight module comprising:
a transparent base plate having a plurality of recesses, at least one of the recesses having a bottom opening; and
a plurality of light emitting units respectively disposed in the plurality of grooves, the plurality of light emitting units having an inclination angle toward a center of a plane of the transparent base plate;
wherein the inclination angles of the plurality of light emitting units gradually increase in a direction from the center of the plane of the transparent base plate toward the side of the transparent base plate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110116852.7A CN114815380A (en) | 2021-01-28 | 2021-01-28 | Backlight module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110116852.7A CN114815380A (en) | 2021-01-28 | 2021-01-28 | Backlight module and display device |
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| CN114815380A true CN114815380A (en) | 2022-07-29 |
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| CN202110116852.7A Pending CN114815380A (en) | 2021-01-28 | 2021-01-28 | Backlight module and display device |
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| KR20070108712A (en) * | 2006-05-08 | 2007-11-13 | 주식회사 엘 앤 에프 | Back light unit |
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