CN114660852A - Novel backlight assembly - Google Patents
Novel backlight assembly Download PDFInfo
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- CN114660852A CN114660852A CN202210571974.XA CN202210571974A CN114660852A CN 114660852 A CN114660852 A CN 114660852A CN 202210571974 A CN202210571974 A CN 202210571974A CN 114660852 A CN114660852 A CN 114660852A
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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
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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
- G02F1/133609—Direct backlight including means for improving the color mixing, e.g. white
-
- 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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
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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 relates to the technical field of display modules, in particular to a novel backlight assembly which comprises a supporting frame, a brightness enhancement film, a diffusion film, a light guide plate, an edge-type backlight plate, a direct-type backlight plate and a backlight back plate, wherein the brightness enhancement film, the diffusion film, the light guide plate and the direct-type backlight plate are arranged in a shell formed by the supporting frame and the backlight back plate from top to bottom, the edge-type backlight plate is positioned on the light guide side, and the edge-type backlight plate is arranged on the side surface of the backlight back plate. This novel backlight unit simple structure, reliable, frivolous, the low power dissipation, hi-lite, high contrast, have the complementary color function, can realize the switching of day night mode.
Description
Technical Field
The invention relates to the technical field of display modules, in particular to a novel backlight assembly.
Background
For a display module with special purposes, particularly a military airborne display module, the display module not only needs to clearly display under the high-altitude condition with strong sunlight, but also needs to be used under the night environment that a pilot wears night vision goggles. Therefore, the brightness adjusting range of the display module should at least satisfy 0.1cd/m2～1000cd/ m2Meanwhile, the requirement of night vision compatibility is met, which puts high requirements on the design of the backlight assembly of the display module.
The traditional direct type or lateral type backlight scheme generally adopts a WOGB (white, orange, green and blue) scheme, high-brightness display is realized by white light, and low-brightness display in a night mode is realized by OGB (one glass solution) color mixing; however, the direct type backlight cannot be thinned due to a larger light mixing distance, and the lateral type backlight often has problems of reduced LED efficiency and reduced reliability due to too high temperature rise under the condition of high brightness display, and the failure rate is not lower.
Therefore, it is urgently needed to provide a new solution, and simultaneously meet the requirements of high reliability, low power consumption, high brightness, light weight, thinness, night vision compatibility and the like, and the new solution is very important for improving the overall performance of military display, especially airborne display modules.
Disclosure of Invention
The invention provides a novel backlight assembly which is simple, high in reliability, light, thin, low in power consumption, high in brightness and contrast, has a color complementing function and can realize day and night mode switching.
In order to realize the purpose of the invention, the adopted technical scheme is as follows: the utility model provides a novel backlight assembly, includes a frame, brightness enhancement film, diffuser film, light guide plate, side income formula backlight unit, straight following formula backlight unit, backplate in a poor light, and brightness enhancement film, diffuser film, light guide plate and straight following formula backlight unit are installed from last to installing in the casing that a frame and backplate in a poor light are constituteed down, and side income formula backlight unit is located the leaded light side, and side at the backplate in a poor light is installed to side income formula backlight unit.
As an optimized scheme of the invention, the side-entry backlight plate is formed by arranging a plurality of groups of three LEDs of orange, green and blue.
As an optimized scheme of the invention, the light guide plate is arranged along the side-in type light incidence direction emitted by the side-in type backlight plate.
As an optimization scheme of the invention, the light-emitting color of the novel backlight assembly is adjusted by adjusting the current of the LEDs with a certain color or a plurality of colors on the side-in type backlight plate, or the light-emitting color of the novel backlight assembly is adjusted by adjusting the PWM duty ratio and matching with the direct type backlight plate.
As an optimization scheme of the invention, a plurality of LEDs are arranged on the direct type backlight plate, the LEDs on the direct type backlight plate are divided into a plurality of areas which are independently controlled to emit light, and the number of the subareas is more than or equal to 200.
As an optimization scheme of the invention, the direct type backlight plate generates a gray scale image of an image according to the characteristics of an image signal input by an external video source, further generates a gray scale image displayed by backlight, and then dynamically controls the light emitting brightness of different independent partitions by adjusting the current magnitude or the PWM duty ratio of each independent partition of the direct type backlight plate.
As an optimized scheme of the invention, the direct type backlight plate adopts a blue tube to excite the fluorescent powder to emit white light.
As a preferred embodiment of the present invention, the brightness enhancement film is a single layer or a multi-layer structure.
The invention has the positive effects that: 1) aiming at the problems of thickness, lower reliability and the like of the traditional direct type or side type backlight scheme, the invention provides a novel backlight assembly which is simple, high in reliability, light, thin, low in power consumption, high in brightness and contrast, has a color complementing function and can realize the switching of day and night modes; has obvious technical advantages and practical value.
2) The direct type backlight plate shortens the uniform light distance of the direct type backlight through the partition dynamic control, realizes the integral lightening and thinning, reduces the power consumption through the partition control of the direct type backlight, and improves the brightness and the contrast of a sun mode; and the OGB side backlight realizes the functions of complementary color and night vision.
Drawings
The invention is described in further detail below with reference to the drawings and the detailed description.
FIG. 1 is an overall block diagram of the present invention;
wherein: 1. a support frame, 2, a brightness enhancement film, 3, a diffusion film, 4, a light guide plate, 5, a side-in type backlight plate, 6, a direct-down type backlight plate, 7 and a backlight back plate.
Detailed Description
As shown in fig. 1, the present invention discloses a novel backlight assembly, which includes a supporting frame 1, a brightness enhancement film 2, a diffusion film 3, a light guide plate 4, an edge-type backlight plate 5, a direct-type backlight plate 6, and a backlight back plate 7, wherein the brightness enhancement film 2, the diffusion film 3, the light guide plate 4, and the direct-type backlight plate 6 are installed in a casing formed by the supporting frame 1 and the backlight back plate 7 from top to bottom, the edge-type backlight plate 5 is located on a light guide side, and the edge-type backlight plate 5 is installed on a side of the backlight back plate 7. The support frame 1 is connected with the backlight backboard 7 through screws, and the side-in type backlight board 5 is adhered to the side surface of the backlight backboard 7 through a heat dissipation adhesive tape. The whole novel backlight assembly is self-integrated to form a standard component. The direct type backlight adopts a dynamic backlight driving mode to emit white light to realize high-brightness daytime mode display; the side-in backlight emits three colors of light, namely O (orange), G (green) and B (blue), so that on one hand, the light emitting color of the backlight component can be subjected to monochromatic or multicolor compensation adjustment, and on the other hand, the light is uniformly mixed into white light through the light guide plate 4 to realize low-brightness night mode display.
The brightness enhancement film 2 may have a single-layer structure or a multi-layer structure, and can realize the functions of angle change and brightness enhancement of light rays. The brightness enhancement film 2 is composed of two prism films. The diffusion film 3 homogenizes the light emitted from the light guide plate 4. The light guide plate 4 has a thickness of not more than 1.5mm and functions to convert a light source of side incidence into a surface light source and homogenize light through the diffusion film 3;
the side-entry backlight plate 5 is composed of a plurality of groups of orange, green and blue LEDs. The lateral type backlight OGB light mixing mode has the functions of providing a backlight source for night mode display of the liquid crystal display module and realizing that the brightness of the liquid crystal display module is not more than 0.1cd/m under the condition that an LED works stably2The index requirements of (1). The lateral backlight OGB light mixing mode also has the function of providing color coordinate adjustment for the liquid crystal display module.
The light guide plate 4 is disposed along the side-in type incident light direction emitted from the side-in type backlight plate 5. The light guide plate 4 is aligned with the side entrance type light incident direction emitted by the side entrance type backlight plate 5, and can perform light uniformizing treatment on the incident lights of three colors of O (orange), G (green) and B (blue) and emit the incident lights into the diffusion film 3.
The light emitting color of the novel backlight assembly is adjusted by adjusting the size of the LED current of a certain color or a plurality of colors on the side-in type backlight plate 5, or the light emitting color of the novel backlight assembly is adjusted by adjusting the size of the PWM duty ratio and matching with the direct type backlight plate 6. The current magnitude of three kinds of LEDs or the PWM duty ratio can be adjusted to realize novel color adjustment of the backlight assembly, and the night vision compatible mode of the liquid crystal display module is realized.
The direct type backlight plate 6 is provided with a plurality of LEDs, the LEDs on the direct type backlight plate 6 are divided into a plurality of areas which can independently control light emission, and the number of the subareas is more than or equal to 200. The number of the subareas is 1024, and the light mixing distance is 1mm, so that the best effect is achieved.
The direct type backlight is driven by adopting a partition dynamic control scheme, and the brightness partition initialization setting can be carried out aiming at the problem of uneven transmittance of the light guide plate 4 (in order to realize the uniformity of the emergent surface light source of the side-in type backlight, the dot design of the light guide plate can cause the uneven transmittance of the light guide plate), so that the uniformity of the emergent surface light source of the novel backlight assembly working in the direct type backlight mode is realized;
the direct type backlight is driven by adopting a partition dynamic control scheme, so that the partition dynamic control of the backlight can be carried out aiming at the input image signal, the power consumption of the product under the maximum brightness is reduced, and the contrast is improved.
The direct type backlight plate 6 generates a gray scale image of an image according to the characteristics of an external video source input graphic signal, and then generates a gray scale image displayed in a backlight mode, and then the brightness of different independent partitions is dynamically controlled by adjusting the current size or the PWM duty ratio of each independent partition of the direct type backlight plate 6, so that the contrast of the display module is improved, and the high brightness and the low power consumption display of the crystal display module are realized.
The direct type backlight plate 6 adopts a blue tube to excite the fluorescent powder to emit white light. Namely, the blue tube is an LED of a blue light chip, and the blue light spectrum emitted by the blue tube is used for carrying out light emitting excitation on the fluorescent powder to realize white display. The light mixing distance (OD value) is not more than 0.5mm, and the number of backlight subareas is not less than 300. The direct type backlight plate 6 adopts a blue tube to excite the fluorescent powder to emit white light, and has the advantages of high luminous efficiency, mature and stable process and low cost;
the direct type backlight plate 6 adopts a blue tube to excite the fluorescent powder to emit white light, so that the problem of large light mixing distance caused by WOGB (white, red, green and blue) is avoided, and the problem that low-brightness display can be realized only when an LED works at an extremely low current, and the LED emits light unevenly or has a flicker fault in the direct type OGB scheme is also avoided. The direct type backlight plate 6 adopts a blue tube to excite the fluorescent powder to emit white light, can realize the requirement that the light mixing distance is not more than 0.5mm, and can realize the light and thin of a novel backlight component.
Novel backlight assembly for realizing 1000cd/m display brightness of liquid crystal module2Under the condition, the power consumption is only 4W, the brightness uniformity is not less than 90%, and the design requirements of lightness, thinness, low power consumption, day and night mode switching and the like are met.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A novel backlight assembly, characterized in that: the backlight module comprises a support frame (1), a brightness enhancement film (2), a diffusion film (3), a light guide plate (4), an edge-in type backlight plate (5), a direct type backlight plate (6) and a backlight back plate (7), wherein the brightness enhancement film (2), the diffusion film (3), the light guide plate (4) and the direct type backlight plate (6) are installed in a shell formed by the support frame (1) and the backlight back plate (7) from top to bottom, the edge-in type backlight plate (5) is located on the side face of the light guide, and the edge-in type backlight plate (5) is installed on the side face of the backlight back plate (7).
2. The novel backlight assembly of claim 1, wherein: the side-entry backlight plate (5) is formed by arranging a plurality of groups of three LEDs of orange, green and blue.
3. The novel backlight assembly of claim 2, wherein: the light guide plate (4) is arranged along the side-in type light incidence direction emitted by the side-in type backlight plate (5).
4. The novel backlight assembly of claim 3, wherein: the light emitting color of the novel backlight assembly is adjusted by adjusting the size of the LED current of a certain color or a plurality of colors on the side-in type backlight plate (5), or the light emitting color of the novel backlight assembly is adjusted by adjusting the size of the PWM duty ratio and matching with the direct type backlight plate (6).
5. The novel backlight assembly of claim 3, wherein: the direct type backlight plate (6) is provided with a plurality of LEDs, the LEDs on the direct type backlight plate (6) are divided into a plurality of areas which can independently control light emission, and the number of the subareas is more than or equal to 200.
6. The novel backlight assembly of claim 5, wherein: the direct type backlight plate (6) generates a gray scale image of an image according to the characteristics of an external video source input graphic signal, further generates a gray scale image displayed in a backlight mode, and then dynamically controls the light emitting brightness of different independent partitions by adjusting the current magnitude or the PWM duty ratio of each independent partition of the direct type backlight plate (6).
7. The novel backlight assembly of any of claims 1-6, wherein: the direct type backlight plate (6) adopts a blue tube to excite the fluorescent powder to emit white light.
8. The novel backlight assembly of claim 7, wherein: the brightness enhancement film (2) is of a single-layer or multi-layer structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210571974.XA CN114660852A (en) | 2022-05-25 | 2022-05-25 | Novel backlight assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210571974.XA CN114660852A (en) | 2022-05-25 | 2022-05-25 | Novel backlight assembly |
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| CN213601017U (en) * | 2020-10-28 | 2021-07-02 | 东莞市银泰丰光学科技有限公司 | Side income formula mixes backlight unit that subregion was adjusted luminance with straight following formula |
| CN215341766U (en) * | 2021-07-29 | 2021-12-28 | 惠州伟志电子有限公司 | Backlight module and display device |
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