CN115704974B - Display device - Google Patents
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- CN115704974B CN115704974B CN202110897613.XA CN202110897613A CN115704974B CN 115704974 B CN115704974 B CN 115704974B CN 202110897613 A CN202110897613 A CN 202110897613A CN 115704974 B CN115704974 B CN 115704974B
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Abstract
The invention discloses a display device, comprising: the backlight module at least comprises a plurality of first light sources and a plurality of second light sources, wherein each first light source is arranged into at least one first light source array, and each second light source is arranged into at least one second light source array; wherein the color temperature of the first light source array is different from the color temperature of the second light source array. The backlight module comprises light source arrays with different color temperatures, so that the effects of display pictures in the areas corresponding to the different light source arrays are different, and when the backlight module is applied to a large-size display device, the different display areas can display image effects more adaptive to the display pictures. The method is particularly suitable for display scenes needing partition display or split screen display.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display device.
Background
As a mainstream display screen at present, the liquid crystal display screen has the advantages of low power consumption, small volume, low radiation and the like. The liquid crystal display panel is a non-self-luminous panel and needs to be matched with a backlight module for use.
The current direct type backlight module generally adopts a light emitting diode (Light Emitting Diode, abbreviated as an LED) as a backlight source, and has the advantages of high backlight brightness, no reduction in brightness after long-time use, and the like.
The conventional liquid crystal display screen can only display images in one mode, and the display effect of each position of the display screen is not different. Along with the wider application scenes of the liquid crystal display, when the large-size display screen adopts partition display or the same display screen simultaneously displays a plurality of images, the differences among the images cannot be highlighted, and the characteristics of individuals cannot be highlighted.
Disclosure of Invention
In some embodiments of the present invention, the backlight module at least includes a plurality of first light sources and a plurality of second light sources, each first light source is arranged into at least one first light source array, and each second light source is arranged into at least one second light source array; wherein the color temperature of the first light source array is different from the color temperature of the second light source array. The backlight module comprises light source arrays with different color temperatures, so that the effects of display pictures in the areas corresponding to the different light source arrays are different, and when the backlight module is applied to a large-size display device, the different display areas can display image effects more adaptive to the display pictures. The method is particularly suitable for display scenes needing partition display or split screen display.
In some embodiments of the present invention, the first light source and the second light source each include a light emitting chip and a phosphor positioned on a light emitting side of the light emitting chip. The light emitting chips of the first light source and the second light source can adopt the same kind of light emitting chips, and the color temperature of the finally emergent light of the first light source and the color temperature of the finally emergent light of the second light source are different through setting the proportion of fluorescent powder.
In some embodiments of the present invention, the backlight module includes a first light source, a second light source, and a third light source. The color temperature of the first light source may be a standard color temperature, and the region corresponding to the first light source array formed by the first light source may display a standard color temperature image. The color temperature of the second light source is smaller than that of the first light source, and then the region corresponding to the second light source array formed by the second light source can display a warm-tone image. And if the color temperature of the third light source is larger than that of the first light source, the region corresponding to the third light source array formed by the third light source can display the cold-tone image. Thereby, image display of corresponding color temperatures can be performed according to the layout of the light sources of different color temperatures.
In some embodiments of the present invention, the color temperature of the first light source is 6500k to 10000k; the color temperature of the second light source is 4000K-6500K; the color temperature of the third light source is 10000K-145000K.
In some embodiments of the present invention, different images are displayed in areas corresponding to different light source arrays, so that the display effect of each image can be highlighted and the contrast between the images can be increased.
In some embodiments of the present invention, a part of the area of the reflective sheet protrudes to a side facing away from the back plate to form a plurality of spacing structures, so that the reflective sheet forms a plurality of reflective cavities; the first light source array, the second light source array and the third light source array are respectively arranged in different reflecting cavities. The interval structure can be a side wall formed by folding the reflecting sheet, the area surrounded by the interval structure forms a reflecting cavity, light rays of the light source in the reflecting cavity can be reflected when the light rays are incident on the side wall, and finally the light rays can only exit in the area limited by the reflecting cavity and cannot exit to the area of the adjacent reflecting cavity, so that crosstalk among light sources with different color temperatures can be avoided, and the image display effect is improved.
In some embodiments of the present invention, the backlight module further includes a plurality of diffusion plate supports, at least a portion of the spacing structure of the reflective sheet is provided with a through hole, and the diffusion plate supports pass through the through hole, and since light rays are reflected after entering the spacing structure, the diffusion plate supports are disposed in the through hole of the spacing structure, so that an influence of the diffusion plate supports on light emitted from the light source can be avoided.
In some embodiments of the present invention, the reflective cavity may be divided into a first reflective cavity, a second reflective cavity, and a third reflective cavity. The first light source array is arranged in the first reflecting cavity, the second light source array is arranged in the second reflecting cavity, and the third light source array is arranged in the third reflecting cavity, so that light crosstalk of adjacent light source arrays can be avoided.
In some embodiments of the present invention, the backlight module further includes: a first optical film and a second optical film. The first optical film is positioned at one side of the diffusion plate, which is away from the first reflecting cavity; the second optical film is positioned on one side of the diffusion plate away from the second reflecting cavity and the third reflecting cavity. Different optical films can be arranged in the areas corresponding to the different reflecting cavities, so that the optical gains of the different areas can be differently arranged.
In some embodiments of the present invention, the area corresponding to the first light source array formed by the first light source may be used for normal image display, so that a higher display brightness is required compared to the area corresponding to the second light source array and the third light source array to highlight the image frame at the position. The brightness gain of the first optical film may be set to be greater than the brightness gain of the second optical film.
In some embodiments of the present invention, the first optical film comprises two prism sheets and a brightness enhancing sheet positioned over the prism sheets, and the first optical film may be a CPP film. The second optical film includes a prism sheet and microlenses positioned over the prism sheet, and the second optical film may employ a MOP film.
In some embodiments of the present invention, the CPP has a higher brightness gain than MOP, and the CPP film disposed on each first reflective cavity where the first light source is disposed can effectively improve the brightness of the area, so as to highlight the display image of the area. For each second reflecting cavity where the second light source is located and the third reflecting cavity where the third light source is located, MOP (metal oxide film) films can be arranged above the second reflecting cavity and the third reflecting cavity, so that light rays can be emitted in the collimation direction.
In some embodiments of the present invention, at least one first light source array is disposed between every two adjacent second light source arrays and every two adjacent third light source arrays, so that the second light source array and the third light source array with larger color temperature differences are not adjacent, and therefore color temperature jump of a display picture is avoided to be larger, and color temperature transition of the display picture is more natural.
In some embodiments of the invention, the distribution density of the first light sources in the first light source array is greater than the distribution density of the second light sources in the second light source array and the distribution density of the third light sources in the third light source array. The number of the first light sources is larger, the distribution density of the first light sources is larger, and the area displaying the standard color temperature can have higher brightness. Meanwhile, the number of the first light sources is more, so that the first light source array can achieve finer partition, and the image display quality of the corresponding area of the first light source array can be improved by using the area dimming technology.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic cross-sectional structure of a display device according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a backlight module according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a second cross-sectional structure of a backlight module according to an embodiment of the present invention;
FIG. 4 is a schematic diagram showing the effect of the light source arrangement according to the embodiment of the present invention;
FIG. 5 is a schematic diagram showing the effect of the light source arrangement according to the embodiment of the present invention;
the LED lamp comprises a back plate 11-a back plate 12-a circuit board 13-a light source 14-a reflecting sheet 15-a diffusing plate 131-a first light source 132-a second light source 133-a third light source 131 s-a first light source array 132 s-a second light source array 133 s-a third light source array 161-a first optical film 162-a second light source film, a p-interval structure x 1-a first reflecting cavity x 2-a second reflecting cavity x 3-a third reflecting cavity.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a further description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus a repetitive description thereof will be omitted. The words expressing the positions and directions described in the present invention are described by taking the drawings as an example, but can be changed according to the needs, and all the changes are included in the protection scope of the present invention. The drawings of the present invention are merely schematic representations of relative positional relationships and are not intended to represent true proportions.
The LCD is mainly composed of a backlight module and an LCD panel. The liquid crystal display panel does not emit light and needs to realize brightness display by means of a light source provided by the backlight module.
The display principle of LCD is to put liquid crystal between two pieces of conductive glass, and drive the electric field between two electrodes to cause the electric field effect of liquid crystal molecule distortion to control the transmission or shielding function of backlight source, so as to display the image. If a color filter is added, a color image can be displayed.
Fig. 1 is a schematic cross-sectional structure of a display device according to an embodiment of the present invention.
Referring to fig. 1, the display device includes: the backlight module 100 and the display panel 200, the backlight module 100 is used for providing backlight source for the display panel 200, and the display panel 200 is used for displaying images.
The backlight module 100 is generally located at the bottom of the display device, and its shape and size are adapted to those of the display device. When applied to the fields of televisions, mobile terminals and the like, the backlight module generally adopts a rectangular shape.
The backlight module in the embodiment of the invention adopts the direct type backlight module and is used for uniformly emitting light in the whole light-emitting surface and providing light with sufficient brightness and uniform distribution for the display panel so that the display panel can normally display images.
The display panel 200 is located on the light emitting side of the backlight module 100, and the shape and size of the display panel are generally matched with those of the backlight module. The display panel 200 may be generally configured in a rectangular shape including a top side, a bottom side, a left side and a right side, wherein the top side is opposite to the bottom side, the left side is opposite to the right side, the top side is connected to one end of the left side and one side of the right side, and the bottom side is connected to the other end of the left side and the other end of the right side, respectively.
The display panel 200 is a transmissive display panel, and is capable of modulating the transmittance of light, but does not emit light itself. The display panel 200 has a plurality of pixel units arranged in an array, and each pixel unit can independently control the transmittance and color of the light incident on the pixel unit by the backlight module 100, so that the light transmitted by all the pixel units forms a displayed image.
Fig. 2 is a schematic cross-sectional structure of a backlight module according to an embodiment of the invention.
Referring to fig. 2, the backlight module includes: the back plate 11, the circuit board 12, the light source 13, the reflecting sheet 14 and the diffusion plate 15.
The back plate 11 is located at the bottom of the backlight module and has supporting and bearing functions. The back plate 11 is typically a square structure, the shape of which is adapted to the shape of the display device when applied to a shaped display device. The back plate 11 includes a top side, a bottom side, a left side, and a right side. Wherein the sky side is relative with the earth side, and left side is relative with the right side, and the sky side links to each other with one end of left side and one side of right side respectively, and the earth side links to each other with the other end of left side and the other end of right side respectively.
The back plate 11 is made of aluminum, iron, aluminum alloy or iron alloy. The back plate 11 is used for supporting the lamp panel, supporting and fixing the edge positions of the components such as the diffusion plate, the optical membrane and the like, and the back plate 11 also plays a role in heat dissipation of the lamp panel.
The circuit board 12 is located above the back plate 11 as a driving board for driving the light source. The circuit board 12 may be generally square or rectangular, and when applied to a shaped display device, the shaped circuit board 12 may be used to accommodate the shape of the display device.
When applied to a large-sized display device, a plurality of circuit boards 12 may be provided, and the plurality of circuit boards 12 may be spliced to provide driving signals, respectively.
The circuit board 12 generally includes a substrate and a wiring layer located over the substrate. Wherein, the substrate can adopt FR4 or PET material, etc., and the surface of the substrate is covered with copper and then etched to form the circuit layer. Alternatively, the substrate may be made of glass with a high thermal conductivity, and the circuit layer may be formed by copper-clad etching on the surface of the substrate, or a plurality of metal layers may be formed on the surface of the substrate by a thin film process to form the driving circuit. And are not limited herein.
The substrate of the above circuit board 12 may be made of a flexible material to form a flexible display device.
The circuit board 12 may be a printed circuit board (Printed Circuit Board, abbreviated as PCB) or an array substrate, which is not limited herein.
The light source 13 is located on the circuit board 12 and is electrically connected to the pads on the surface of the circuit board. In the embodiment of the present invention, the light source 13 may be a light emitting diode (Light Emitting Diode, abbreviated as LED) or a micro light emitting diode (Mini Light Emitting Diode, abbreviated as Mini LED).
The LED has the advantages of high brightness, low power consumption, high response speed and the like, and is widely used as a backlight source. The LED comprises a light emitting chip and a lens positioned at the light emitting side of the light emitting chip, the lens has refraction or reflection effect on light emitted by the light emitting diode, and the light emitting angle of the LED can be enlarged, so that the interval distance between the LEDs can be enlarged, the use quantity of the LEDs is reduced, and the manufacturing cost of the display device is further reduced.
The miniature light emitting diode can adopt a Mini LED, the structure of the Mini LED is different from that of the LED, and the size of a light emitting chip of the Mini LED is far smaller than that of a traditional LED. The chip size of an LED is typically on the order of millimeters, which may be several millimeters. While the chip size of Mini LEDs is in the order of micrometers, typically less than 500 μm. Therefore, a larger number of Mini LEDs can be arranged in the same area, and finer partition can be realized for the Mini LEDs when the regional dimming technology is adopted, so that high-contrast and high-dynamic image display is realized.
The Mini LED chip can be packaged in a POB mode and a COB mode.
When the Mini LED chip is packaged in a POB packaging mode, a packaging support is arranged on the outer side of the Mini LED chip and used for packaging and protecting the Mini LED chip, and foreign matters are prevented from entering the Mini LED. In the embodiment of the invention, when the Mini LED chip is packaged in a POB packaging mode, the lower surface of the chip is formed with patch electrodes at the same time, the patch electrodes are correspondingly and electrically connected with the electrodes of the Mini LED, and the packaged Mini LED is welded on a bonding pad of the circuit board 12 after the packaging. The POB packaging mode has mature process and good adaptability. The Mini LED chip and the packaging support form a light source 13.
When the Mini LED chip is packaged in a COB packaging mode, the Mini LED chip is firstly welded on a bonding pad of the circuit board 12, then the Mini LED chip is packaged in a glue dispensing or whole-layer gluing mode on the surface of the Mini LED chip, and the packaging glue on the surface of the Mini LED chip can be made of transparent colloid materials such as silica gel, modified silica gel or epoxy resin with better permeability. COB packages have high efficiency and low cost.
The circuit board 12 and the electrically connected light source 13 form a light panel, and in this embodiment of the present invention, the backlight module may include one light panel, or may include a plurality of light panels for performing a splice arrangement, which is not limited herein.
The reflecting sheet 14 is positioned on the surface of the circuit board 12 on the side close to the light source 13. The reflector sheet 14 has the same shape as the back plate, and may be generally provided in a square or rectangular shape. The reflection sheet 14 includes a plurality of openings for exposing the light source 13.
As shown in fig. 2, the back plate 11 includes a planar area at the bottom and a bending area around the planar area, and a certain included angle is formed between the bending area and the planar area, so that the back plate 11 forms a containing structure, and the lamp panel is located in the containing structure. Accordingly, the reflection sheet 14 is also provided as a bottom surface and a side surface, wherein the bottom surface of the reflection sheet 14 is provided on the planar area of the back plate 11, and the side surface of the reflection sheet 14 is provided on the folded area of the back plate 11. The side surface of the reflecting sheet is bent according to the angle of the bending area of the backboard so as to adapt to the angle of the bending area.
The reflective sheet 14 has the property of reflecting light, so that the light emitted from the light source 13 to the reflective sheet 14 at a large angle and the light reflected back to the back plate side by the elements in the backlight module can be reflected by the reflective sheet 14 again to the light emitting side, thereby improving the utilization efficiency of the light source.
The diffusion plate 15 is located on the light-emitting side of the light source 13 at a set distance from the light source 13. The diffusion plate 15 is integrally provided, and the diffusion plate 15 has the same shape as the lamp panel, and may be generally provided in a rectangular shape or a square shape.
The diffusion plate 15 is used for scattering incident light, so that the light passing through the diffusion plate 15 is more uniform. The diffusion plate 15 is provided with scattering particle materials, and light rays are incident on the scattering particle materials and are continuously refracted and reflected, so that the effect of scattering the light rays is achieved, and the effect of homogenizing the light is achieved.
The diffusion plate 15 has a certain thickness and may be generally set to 1.5mm to 3mm. The haze of the diffusion plate increases with the thickness, and the uniformity is improved, and the diffusion plate can be processed by adopting an extrusion process, wherein the diffusion plate is made of at least one material selected from polymethyl methacrylate PMMA, polycarbonate PC, polystyrene PS and polypropylene PP.
The display device provided by the embodiment of the invention is a large-size display device, and can be applied to display scenes such as split screen display, partition display and the like required by conferences and monitoring. In order to highlight the image difference of each partition, the display device can be expanded and applied to more use scenes, and the backlight module provided by the embodiment of the invention at least comprises two light sources, as shown in fig. 2, a first light source 131 and a plurality of second light sources 132 respectively; wherein, each first light source 131 is arranged into at least one first light source array 131s, and each second light source 132 is arranged into at least one second light source array 132s.
In an embodiment of the invention, the color temperature of the first array of light sources is different from the color temperature of the second array of light sources. Therefore, the effects of the display pictures of the areas corresponding to the different light source arrays are different, and the different areas can display the image effects which are more adaptive to the display pictures of the different areas. The method is particularly suitable for display scenes needing partition display or split screen display.
The first light source 131 and the second light source 132 may be white LEDs, and each include a light emitting chip and a phosphor powder located on a light emitting side of the light emitting chip. The light emitting chips of the first light source 131 and the second light source 132 can adopt the same kind of light emitting chips, and the color temperature of the final emergent light of the first light source 131 and the second light source 132 is different through setting the proportion of fluorescent powder. In addition, the first light source 131 and the second light source 132 may be different types of light sources to change the color temperature of the emitted light, which is not limited herein.
Fig. 3 is a schematic diagram of a cross-sectional structure of a backlight module according to an embodiment of the invention.
Referring to fig. 3, in some embodiments, the backlight module may include a first light source 131, a second light source 132, and a third light source 133. The first light sources 131 are arranged in at least one first light source array 131s, the second light sources 132 are arranged in at least one second light source array 132s, and the third light sources 133 are arranged in at least one third light source array 133s. Wherein the color temperature of the first light source 131 is greater than the color temperature of the second light source 132; the color temperature of the first light source 131 is smaller than that of the third light source 133.
In a specific implementation, the color temperature of the first light source 131 may be a standard color temperature, and the color temperature of the second light source 132 is smaller than that of the first light source 131, so that an area corresponding to the second light source array 132s formed by the second light source 132 may display a warm-tone image. The color temperature of the third light source 133 is greater than that of the first light source 131, and thus an area corresponding to the third light source array 133s formed by the third light source 133 may display a cold-tone image. Thereby, image display of corresponding color temperatures can be performed according to the layout of the light sources of different color temperatures.
In practical application, the color temperature of the first light source 131 is 6500k to 10000k; the color temperature of the second light source 132 is 4000K-6500K; the color temperature of the third light source 133 is 10000K-145000K. The color temperature of the first light source 131 is a standard color temperature of a common light source, and in order to realize image display of cool and warm hues, a second light source 132 with a smaller color temperature and a third light source 133 with a larger color temperature are respectively arranged.
In specific implementation, the light source with more color temperature specifications can be set according to the requirement so as to form a richer image contrast effect, which is not limited herein.
It should be noted that, in the display device provided by the embodiment of the present invention, different images are displayed in the areas corresponding to different light source arrays, so that the display effect of each image can be highlighted and the contrast between the images can be increased.
As shown in fig. 3, in order to avoid light crosstalk between different light source arrays, a part of the area of the reflecting sheet 14 protrudes to a side away from the back plate 11 to form a plurality of spacing structures p, so that the reflecting sheet 14 forms a plurality of reflecting cavities; the first light source array 131s, the second light source array 132s and the third light source array 133s are disposed in different reflective cavities, respectively.
The interval structure p may be a side wall formed by folding the reflecting sheet 14, the area surrounded by the interval structure p forms a reflecting cavity, light of the light source in the reflecting cavity can be reflected when entering the side wall, and finally the light can only exit in the area limited by the reflecting cavity, but can not exit to the area of the adjacent reflecting cavity, thereby avoiding crosstalk between light sources with different color temperatures and improving the image display effect.
The backlight module further comprises a plurality of diffusion plate holders (not shown) disposed between the back plate 11 and the diffusion plate 15. The diffusion plate support can be made of rigid materials such as polymethyl methacrylate (PMMA) and the like and is used for supporting the diffusion plate 15, so that the diffusion plate 15 is prevented from collapsing, and the same light mixing distance at each position is ensured.
In the embodiment of the present invention, at least part of the spacing structure p of the reflecting sheet 14 is provided with a through hole, and the diffusion plate support is disposed through the through hole, and since the light is reflected after entering the spacing structure p, the diffusion plate support is disposed in the through hole of the spacing structure p, so that the influence of the diffusion plate support on the light emitted from the light source can be avoided.
As shown in fig. 3, the reflective cavities may be divided into a first reflective cavity x1, a second reflective cavity x2, and a third reflective cavity x3 according to the kind of the light source. The first light source array 131s is disposed in the first reflective cavity x1, the second light source array 132s is disposed in the second reflective cavity x2, and the third light source array 133s is disposed in the third reflective cavity x3, so that crosstalk of light rays of adjacent light source arrays can be avoided.
The backlight module further comprises: a first optical film 161 and a second optical film 162. Wherein the first optical film 161 is located at a side of the diffusion plate 15 facing away from the first reflective cavity x 1; the second optical film 162 is located at a side of the diffusion plate 15 facing away from the second reflective cavity x2 and the third reflective cavity x3. According to the embodiment of the invention, different optical films can be arranged in the areas corresponding to different reflecting cavities, so that the optical gains of different areas can be differently arranged.
In the embodiment of the present invention, the area corresponding to the first light source array 131s formed by the first light source 131 may be used for normal image display, so that a higher display brightness is required to highlight the image frame at this position compared to the areas corresponding to the second light source array 132s and the third light source array 133s. The luminance gain of the first optical film 161 may be set to be greater than the luminance gain of the second optical film 162.
Specifically, the first optical film 161 includes two prism sheets and a brightness enhancing sheet positioned over the prism sheets, and the first optical film 161 may employ a CPP film. The second optical film 162 includes a prism sheet and microlenses positioned over the prism sheet, and the second optical film 162 may employ a MOP film.
The CPP film is added with a layer of reflective brightness enhancement film (DBEF) on the basis of two layers of mutually perpendicular prism sheets, and compared with MOP, the CPP film has higher brightness gain, and the brightness of the area can be effectively improved by arranging the CPP film on each first reflection cavity x1 where the first light source 131 is positioned, so that the display image of the area is highlighted. For the second reflective cavity x2 where the second light source 132 is located and the third reflective cavity x3 where the third light source 133 is located, MOP films may be disposed above the second reflective cavity x2 and the third reflective cavity x3, so that light can be emitted in a collimation direction.
It should be noted that, in the embodiment of the present invention, a dark shadow may be formed at the position of the joint by using different optical films for jointing, so that when gray scale control is performed on the display panel, the gray scale of the pixel unit of the display panel at the position corresponding to the joint can be increased, so as to avoid forming the dark shadow.
Fig. 4 is a schematic diagram showing an effect of the light source arrangement according to the embodiment of the present invention.
Referring to fig. 4, the first light sources 131 are arranged in a plurality of first light source arrays 131s, the second light sources 132 are arranged in a plurality of second light source arrays 132s, and the second light sources 133 are arranged in a plurality of second light source arrays 133s. At least one first light source array 131s is disposed between every two adjacent second light source arrays 132s and third light source arrays 133s, so that the second light source arrays 132s and the third light source arrays 133s with larger color temperature differences are not adjacent, and color temperature jump of the display picture is avoided to be larger, and color temperature transition of the display picture is more natural.
Fig. 5 is a second schematic diagram illustrating an effect of the light source arrangement according to the embodiment of the present invention.
Referring to fig. 5, the distribution density of the first light sources 131 in the first light source array 131s is greater than the distribution density of the second light sources 132 in the second light source array 132s and the distribution density of the third light sources 133 in the third light source array 133s.
The number of the first light sources in the first light source array 131s is greater, and the distribution density of the first light sources 131 is greater, so that the region displaying the standard color temperature can have higher brightness. Meanwhile, the number of the first light sources 131 is larger, so that the first light source array 131s can be more finely partitioned, and the image display quality of the corresponding area of the first light source array 131s can be improved by using the area dimming technology.
In practical applications, the second light source array 132s and the third light source array 133s may also be adjusted according to a specific arrangement rule or a specific distribution density, so as to adapt to the requirements of a specific usage scenario, which is not limited herein.
According to the first inventive concept, the backlight module at least comprises a plurality of first light sources and a plurality of second light sources, wherein each first light source is arranged into at least one first light source array, and each second light source is arranged into at least one second light source array; wherein the color temperature of the first light source array is different from the color temperature of the second light source array. The backlight module comprises light source arrays with different color temperatures, so that the effects of display pictures in the areas corresponding to the different light source arrays are different, and when the backlight module is applied to a large-size display device, the different display areas can display image effects more adaptive to the display pictures. The method is particularly suitable for display scenes needing partition display or split screen display.
According to a second inventive concept, the first light source and the second light source each comprise a light emitting chip and a phosphor powder located at the light emitting side of the light emitting chip. The light emitting chips of the first light source and the second light source can adopt the same kind of light emitting chips, and the color temperature of the finally emergent light of the first light source and the color temperature of the finally emergent light of the second light source are different through setting the proportion of fluorescent powder.
According to a third inventive concept, the backlight module includes a first light source, a second light source, and a third light source. The color temperature of the first light source may be a standard color temperature, and the region corresponding to the first light source array formed by the first light source may display a standard color temperature image. The color temperature of the second light source is smaller than that of the first light source, and then the region corresponding to the second light source array formed by the second light source can display a warm-tone image. And if the color temperature of the third light source is larger than that of the first light source, the region corresponding to the third light source array formed by the third light source can display the cold-tone image. Thereby, image display of corresponding color temperatures can be performed according to the layout of the light sources of different color temperatures.
According to the fourth inventive concept, the color temperature of the first light source is 6500K-10000K; the color temperature of the second light source is 4000K-6500K; the color temperature of the third light source is 10000K-145000K.
According to the fifth inventive concept, different images are displayed in areas corresponding to different light source arrays, thereby enabling the display effect of each image to be highlighted and the contrast between the images to be increased.
According to a sixth inventive concept, a part of the area of the reflective sheet protrudes to a side facing away from the back plate to form a plurality of spacing structures, so that the reflective sheet forms a plurality of reflective cavities; the first light source array, the second light source array and the third light source array are respectively arranged in different reflecting cavities. The interval structure can be a side wall formed by folding the reflecting sheet, the area surrounded by the interval structure forms a reflecting cavity, light rays of the light source in the reflecting cavity can be reflected when the light rays are incident on the side wall, and finally the light rays can only exit in the area limited by the reflecting cavity and cannot exit to the area of the adjacent reflecting cavity, so that crosstalk among light sources with different color temperatures can be avoided, and the image display effect is improved.
According to the seventh inventive concept, the backlight module further includes a plurality of diffusion plate holders, at least a portion of the spacing structure of the reflective sheet is provided with through holes, the diffusion plate holders pass through the through holes, and since light rays are reflected after entering the spacing structure, the diffusion plate holders are disposed in the through holes of the spacing structure, and thus, the influence of the diffusion plate holders on light emitted from the light source can be avoided.
According to an eighth inventive concept, the reflective cavity may be divided into a first reflective cavity, a second reflective cavity, and a third reflective cavity. The first light source array is arranged in the first reflecting cavity, the second light source array is arranged in the second reflecting cavity, and the third light source array is arranged in the third reflecting cavity, so that light crosstalk of adjacent light source arrays can be avoided.
According to a ninth inventive concept, the backlight module further comprises: a first optical film and a second optical film. The first optical film is positioned at one side of the diffusion plate, which is away from the first reflecting cavity; the second optical film is positioned on one side of the diffusion plate away from the second reflecting cavity and the third reflecting cavity. Different optical films can be arranged in the areas corresponding to the different reflecting cavities, so that the optical gains of the different areas can be differently arranged.
According to the tenth inventive concept, the region corresponding to the first light source array formed by the first light source may be used for normal image display, and thus a higher display brightness is required to highlight the image picture at that location than the regions corresponding to the second light source array and the third light source array. The brightness gain of the first optical film may be set to be greater than the brightness gain of the second optical film.
According to the eleventh inventive concept, the first optical film includes two prism sheets and a brightness enhancing sheet positioned above the prism sheets, and the first optical film may employ a CPP film. The second optical film includes a prism sheet and microlenses positioned over the prism sheet, and the second optical film may employ a MOP film.
According to the twelfth inventive concept, the CPP has a higher brightness gain than MOP, and the CPP film is disposed on each first reflective cavity where the first light source is located, so that the brightness of the light exiting from the area can be effectively improved, thereby highlighting the display image of the area. For each second reflecting cavity where the second light source is located and the third reflecting cavity where the third light source is located, MOP (metal oxide film) films can be arranged above the second reflecting cavity and the third reflecting cavity, so that light rays can be emitted in the collimation direction.
According to the thirteenth invention conception, at least one first light source array is arranged between every two adjacent second light source arrays and every two adjacent third light source arrays, so that the second light source arrays and the third light source arrays with larger color temperature differences are not adjacent, and color temperature jump of a display picture is avoided to be larger, and color temperature transition of the display picture is more natural.
According to a fourteenth inventive concept, the distribution density of the first light sources in the first light source array is greater than the distribution density of the second light sources in the second light source array and the distribution density of the third light sources in the third light source array. The number of the first light sources is larger, the distribution density of the first light sources is larger, and the area displaying the standard color temperature can have higher brightness. Meanwhile, the number of the first light sources is more, so that the first light source array can achieve finer partition, and the image display quality of the corresponding area of the first light source array can be improved by using the area dimming technology.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (9)
1. A display device, comprising:
a display panel for displaying an image;
the backlight module is positioned on the light incident side of the display panel and is used for providing backlight;
the backlight module at least comprises a plurality of first light sources and a plurality of second light sources, wherein the color temperature of the emergent light of the first light sources is different from that of the emergent light of the second light sources; each first light source is arranged into at least one first light source array, and each second light source is arranged into at least one second light source array; the color temperature of the first light source array is different from that of the second light source array, so that the light source arrays with different color temperatures can display images with corresponding color temperatures; the distribution density of the first light sources in the first light source array is greater than the distribution density of the second light sources in the second light source array;
the backlight module further comprises:
a reflective sheet including a plurality of openings for exposing the light sources; the partial areas of the reflecting sheets are protruded to form a plurality of interval structures, so that the reflecting sheets form a plurality of reflecting cavities; the light emitting cavity comprises a first reflecting cavity and a second reflecting cavity, the first light source array is arranged in the first reflecting cavity, and the second light source array is arranged in the second reflecting cavity;
a diffusion plate positioned above the reflective cavity;
the first optical film is positioned on one side of the diffusion plate, which is away from the first reflecting cavity, and the second optical film is positioned on one side of the diffusion plate, which is away from the second reflecting cavity; the brightness gain of the first optical film is larger than that of the second optical film, the first optical film comprises two prism sheets and a brightness enhancement sheet positioned on the prism sheets, and the second optical film comprises a prism sheet and a micro lens positioned on the prism sheets.
2. The display device of claim 1, wherein the backlight module further comprises a plurality of third light sources, each of the third light sources arranged in at least one third light source array;
wherein the color temperature of the first light source is greater than the color temperature of the second light source; the color temperature of the first light source is smaller than the color temperature of the third light source.
3. The display device according to claim 2, wherein the color temperature of the first light source is 6500k to 10000k; the color temperature of the second light source is 4000K-6500K; the color temperature of the third light source is 10000K-145000K.
4. The display device of claim 2, wherein at least one of the first light source arrays is disposed between adjacent ones of the second light source arrays and the third light source arrays.
5. The display device of claim 2, wherein the backlight module further comprises:
the backboard has supporting and bearing functions; the first light source array, the second light source array and the third light source array are located on the back plate.
6. The display device of claim 5, wherein the reflective cavity further comprises a third reflective cavity; the third light source array is arranged in the third reflecting cavity;
the second optical film is positioned at one side of the diffusion plate away from the second reflecting cavity and the third reflecting cavity.
7. The display device of claim 6, wherein a distribution density of the first light sources within the first reflective cavity is greater than a distribution density of the third light sources within the third reflective cavity.
8. The display device according to claim 6 or 7, wherein the backlight module further comprises: a plurality of diffuser plate holders positioned between the backing plate and the diffuser plate;
at least part of the interval structure of the reflecting sheet is provided with a through hole, and the diffusion plate support is arranged in the through hole.
9. The display device of any one of claims 2-7, wherein the first light source, the second light source, and the third light source are all light emitting diodes or micro light emitting diodes.
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| CN115704974A (en) | 2023-02-17 |
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