CN106125404B - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
- Publication number
- CN106125404B CN106125404B CN201610804233.6A CN201610804233A CN106125404B CN 106125404 B CN106125404 B CN 106125404B CN 201610804233 A CN201610804233 A CN 201610804233A CN 106125404 B CN106125404 B CN 106125404B
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- backlight module
- electrochromic device
- guide plate
- light guide
- driving circuit
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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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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- 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)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The invention relates to the technical field of display, in particular to a backlight module and a display device. The backlight module comprises a light source, a light guide plate, a reflecting sheet superposed with the light guide plate, a drive circuit electrically connected with the light source and a controller; the controller is in signal connection with the driving circuit; the backlight module also comprises an electrochromic device which is arranged on one side of the reflector plate facing the light guide plate and is arranged in parallel with the reflector plate, and the electrochromic device is electrically connected with the driving circuit. The backlight module can reduce low gray scale brightness through the electrochromic device, and then static contrast and display effect of the display device are improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module and a display device.
Background
Because the LED (Light Emitting Diode) has the characteristics of low working voltage, power saving, energy saving, long service life, good stability, short response time and convenient driving, more and more LCD (Liquid crystal display) products use the backlight technology of the LED. Generally, the backlight module LED is classified into a direct type LED backlight module and an edge type LED backlight module, the direct type LED backlight module directly places a plurality of LED lamps behind the display screen, and the edge type LED backlight module distributes the plurality of LED lamps around the display screen and uniformly guides light to the display screen through the light guide plate.
The structure of the existing side-in type LED backlight module 1 is shown in fig. 1, and generally includes a back plate 11, a rubber frame 12, a light source 13, a light guide plate 14, a reflective sheet 15 and an optical film material 16, where the light source 13 is disposed on a light-in side of the light guide plate 14, the reflective sheet 15 is disposed between the light guide plate 14 and the back plate 11, and the light-out side of the light guide plate 14 is disposed with the optical film material 16; in the side-in LED backlight module 1 of the prior art, after each component is determined, the brightness of the light emitted from the optical film 16 is determined, so that the static contrast and the display effect of the display device cannot be improved because the low gray scale brightness cannot be adjusted in the prior art of the side-in LED backlight module 1.
Disclosure of Invention
The invention provides a backlight module and a display device, wherein the backlight module can reduce low gray scale brightness through an electrochromic device, and further improve the static contrast and the display effect of the display device.
In order to achieve the purpose, the invention provides the following technical scheme:
a backlight module comprises a light source, a light guide plate, a reflecting sheet superposed with the light guide plate, a drive circuit electrically connected with the light source and a controller; the controller is in signal connection with the driving circuit;
the light guide plate is arranged on the light guide plate, and the electrochromic device is arranged in parallel with the light guide plate and electrically connected with the driving circuit.
The electrochromic device is a device made of electrochromic materials, and materials with electrochromic properties are called electrochromic materials. Electrochromism refers to a phenomenon in which optical properties (reflectivity, transmittance, absorption, and the like) of a material undergo a stable and reversible color change under the action of an applied electric field, and is visually represented as a reversible change in color and transparency.
Because backlight unit is provided with electrochromic device in reflector plate one side towards the light guide plate, in backlight unit working process, backlight unit passes through the voltage that controller control drive circuit exported electrochromic device, electrochromic device makes electrochromic material change between transparent state and painted state according to the different voltage of drive circuit input, and when electrochromic material was in transparent state, the light transmissivity is higher, and when electrochromic material was in painted state, the light transmissivity is lower, consequently, backlight unit can adjust the light transmissivity of light-emitting side through electrochromic device, and then adjust backlight unit emergent light's luminance and intensity. When the electrochromic device is in different coloring states, the electrochromic device can reduce the transmittance of light, so that the quantity of the light emitted from the light-emitting side of the backlight module is reduced, the brightness and the intensity of the light on the light-emitting side are reduced, and the low gray scale brightness of the backlight module is further reduced.
Therefore, the backlight module can reduce low gray scale brightness through the electrochromic device, and further improve the static contrast and the display effect of the display device.
Preferably, the electrochromic device comprises a first transparent conductive layer, an electrochromic layer, an ion conductive layer, an ion storage layer and a second transparent conductive layer which are sequentially arranged on a substrate.
Preferably, the first transparent conductive layer and the second transparent conductive layer are both electrically connected to the driving circuit.
Preferably, the first transparent conductive layer is electrically connected with the driving circuit through a first control line arranged at the periphery of the electrochromic device; the second transparent conducting layer is electrically connected with the driving circuit through a second control line arranged on the periphery of the electrochromic device.
Preferably, the transmittance of the electrochromic device is 20% to 90%.
Preferably, the electrochromic device is disposed between the light guide plate and the reflective sheet.
Because the electrochromic device is arranged between the light guide plate and the reflector plate, the backlight module can better control the light transmittance of the light reflected from the reflector plate to the light guide plate.
Preferably, the electrochromic device is adhered to the reflective sheet.
Preferably, the electrochromic device is adhered to the reflective sheet by a transparent adhesive.
Preferably, a projection area of the electrochromic device on the light guide plate is smaller than a projection area of the reflective sheet on the light guide plate.
In addition, the invention also provides a display device which comprises a display panel and any one of the backlight modules provided by the technical scheme.
Drawings
FIG. 1 is a schematic structural diagram of a side-in type LED backlight module in the prior art;
fig. 2 is a schematic structural diagram of a backlight module according to an embodiment of the invention;
FIG. 3 is a schematic view of an A-direction structure of the backlight module shown in FIG. 2;
FIG. 4 is a schematic structural view of the electrochromic device shown in the structure of FIG. 2;
fig. 5 is a schematic diagram of the electrical connections of the electrochromic device shown in the structure of fig. 2.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a backlight module and a display device, wherein the display device comprises a display panel and the backlight module, and the backlight module can reduce low gray scale brightness through an electrochromic device so as to improve the static contrast and the display effect of the display device.
Referring to fig. 2 and 3, a backlight module 100 according to an embodiment of the present invention includes a light source 110, a light guide plate 120, a reflective sheet 130 stacked on the light guide plate 120, a driving circuit 170 electrically connected to the light source 110, and a controller 180, wherein the controller 180 is in signal connection with the driving circuit 170;
the backlight module 100 further includes an electrochromic device 140 disposed on a side of the reflective sheet 130 facing the light guide plate 120 and parallel to the reflective sheet 130, wherein the electrochromic device 140 is electrically connected to the driving circuit 170. As shown in fig. 2, the backlight module 100 includes an electrochromic device 140 disposed between the reflective sheet 130 and the light guide plate 120.
As shown in the structure of fig. 4, the electrochromic device 140 is a device made of electrochromic material, and the material having electrochromic property is called electrochromic material. Electrochromism refers to a phenomenon in which optical properties (reflectivity, transmittance, absorption, and the like) of a material undergo a stable and reversible color change under the action of an applied electric field, and is visually represented as a reversible change in color and transparency.
Because the backlight module 100 is provided with the electrochromic device 140 on the side of the reflector 130 facing the light guide plate 120, in the working process of the backlight module 100, the backlight module 100 controls the voltage output to the electrochromic device 140 by the driving circuit 170 through the controller 180, the electrochromic device 140 enables the electrochromic material to change between the transparent state and the colored state according to different voltages input by the driving circuit 170, and when the electrochromic material is in the transparent state, the light transmittance is high, and when the electrochromic material is in the colored state, the light transmittance is low, therefore, the backlight module 100 can adjust the light transmittance on the light emitting side through the electrochromic device 140, and further adjust the brightness and the intensity of the light emitted by the backlight module 100. When the electrochromic device 140 is in different coloring states, the electrochromic device 140 can reduce the transmittance of light, so that the quantity of light emitted from the light-emitting side of the backlight module 100 is reduced, the brightness and intensity of light at the light-emitting side are reduced, and the low gray scale brightness of the backlight module 100 is reduced, therefore, the backlight module 100 can reduce the low gray scale brightness of the backlight module 100 through the electrochromic device 140, and the static contrast and the display effect of the display device can be improved.
Therefore, the backlight module 100 can reduce the low gray scale brightness through the electrochromic device 140, thereby improving the static contrast and the display effect of the display device.
In a specific embodiment, as shown in the structure of fig. 4, the electrochromic device 140 includes a first transparent conductive layer 142, an electrochromic layer 143, an ion conductive layer 144, an ion storage layer 145 and a second transparent conductive layer 146, which are sequentially disposed on a substrate 141. In order to realize the electrical connection between the electrochromic device 140 and the driving circuit 170, as shown in the structure of fig. 5, the first transparent conductive layer 142 and the second transparent conductive layer 146 are electrically connected to the driving circuit 170.
As shown in fig. 5, when the backlight module 100 is in an operating state, the first transparent conductive layer 142 of the electrochromic device 140 and the positive electrode or negative electrode of the driving circuit 170 may be electrically connected through the first control line 190, the negative electrode or positive electrode of the driving circuit 170 corresponding to the second transparent conductive layer 146 may be electrically connected through the second control line 191, the output voltage of the driving circuit 170 is adjusted through the signal connection between the controller 180 and the driving circuit 170, the driving circuit 170 applies different voltages to the electrochromic device 140 to form different electric fields, and the electric fields formed by the different voltages are applied to the electrochromic layer 143, the ion conductive layer 144 and the ion storage layer 145, so that the transmittance of light is adjusted through the change of the electrochromic layer 143 between the transparent state and the colored state.
As shown in the structure of fig. 2, when the electrochromic device 140 is disposed between the reflective sheet 130 and the light guide plate 120, under the action of different voltages, the transmittance of the light emitted from the light guide plate 120 to the reflective sheet 130 can be adjusted by changing between the transparent state and the colored state of the electrochromic device 140, and the transmittance of the light reflected from the reflective sheet 130 to the light guide plate 120 can be adjusted, so as to adjust the quantity of the light on the light emitting side of the light guide plate 120, thereby controlling the brightness and intensity of the light, and reducing the low gray scale brightness of the backlight module 100.
As shown in the structure of fig. 3, the electrochromic device 140 may be electrically connected to the driving circuit 170 through a first control line 190 and a second control line 191 located at two ends of the electrochromic device 140, and similarly, the driving circuit 170 may be connected to the controller 180 through a signal line.
Specifically, the transmittance of the electrochromic device 140 is 20% to 90%.
In a specific operation of the electrochromic device 140 described above, the transmittance may be 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, etc.
In order to better control the transmittance of light reflected from the reflective sheet 130 toward the light guide plate 120, as shown in the structures of fig. 2 and 3, the electrochromic device 140 is disposed between the light guide plate 120 and the reflective sheet 130. In an actual production process, the electrochromic device 140 may be disposed on a side of the reflective sheet 130 facing the light guide plate 120, not limited to be disposed between the light guide plate 120 and the reflective sheet 130, but also disposed between the light guide plate 120 and the optical film 160, or disposed on a light emitting side of the optical film 160, and the electrochromic device 140 may be disposed at any position in the backlight module 100 where the light transmittance may be adjusted according to a specific use condition and an expected effect, so as to adjust the light brightness and intensity on the light emitting side.
Further, when the electrochromic device 140 is disposed between the light guide plate 120 and the reflective sheet 130, the electrochromic device 140 may be adhered to the reflective sheet 130 for convenience of manufacturing and assembly, e.g., the substrate 141 of the electrochromic device 140 is adhered to a side of the reflective sheet 130 facing the light guide plate 120; also, in order to reduce the influence of the adhesive on light during the assembly process, the electrochromic device 140 may be adhered to the reflective sheet 130 by a transparent adhesive.
In order to conveniently arrange the driving circuit 170 and the first and second control lines 190 and 191 for electrically connecting the electrochromic device 140 and the driving circuit 170, and to make the projection area of the electrochromic device 140 on the light guide plate 120 smaller than the projection area of the reflective sheet 130 on the light guide plate 120, as shown in the structure of fig. 3, the control lines 190 are arranged on both sides of the electrochromic device 140 on the top surface of the reflective sheet 130, and the driving circuit 170 may also be arranged on the control lines 190.
The LED light source in the backlight module 100 is preferably an LED light source because the LED light source has the characteristics of small size, low voltage, long service life, high brightness and low heat.
In addition, an embodiment of the present invention further provides a display device, which includes a display panel and any one of the backlight modules 100 provided in the foregoing embodiments. The display device may be a liquid crystal display device.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A backlight module comprises a light source, a light guide plate, a reflecting sheet superposed with the light guide plate, a drive circuit electrically connected with the light source and a controller; the controller is in signal connection with the driving circuit;
it is characterized in that the preparation method is characterized in that,
the electrochromic device is arranged on one side, facing the light guide plate, of the reflector plate and is arranged in parallel with the reflector plate, and the electrochromic device is electrically connected with the driving circuit;
the electrochromic device is arranged between the light guide plate and the reflector plate;
the electrochromic device is bonded to the reflective sheet.
2. The backlight module according to claim 1, wherein the electrochromic device comprises a first transparent conductive layer, an electrochromic layer, an ion conductive layer, an ion storage layer and a second transparent conductive layer sequentially disposed on the substrate.
3. The backlight module as claimed in claim 2, wherein the first transparent conductive layer and the second transparent conductive layer are electrically connected to the driving circuit.
4. The backlight module as claimed in claim 3, wherein the first transparent conductive layer is electrically connected to the driving circuit via a first control line disposed at the periphery of the electrochromic device; the second transparent conducting layer is electrically connected with the driving circuit through a second control line arranged on the periphery of the electrochromic device.
5. The backlight module as claimed in claim 2, wherein the transmittance of the electrochromic device is 20% to 90%.
6. A backlight module according to claim 1, wherein the electrochromic device is adhered to the reflective sheet by a transparent adhesive.
7. The backlight module as claimed in claim 1, wherein the projection area of the electrochromic device on the light guide plate is smaller than the projection area of the reflective sheet on the light guide plate.
8. A display device comprising a display panel, further comprising a backlight module according to any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610804233.6A CN106125404B (en) | 2016-09-05 | 2016-09-05 | Backlight module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610804233.6A CN106125404B (en) | 2016-09-05 | 2016-09-05 | Backlight module and display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106125404A CN106125404A (en) | 2016-11-16 |
| CN106125404B true CN106125404B (en) | 2020-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610804233.6A Active CN106125404B (en) | 2016-09-05 | 2016-09-05 | Backlight module and display device |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109557697B (en) * | 2018-12-25 | 2021-06-15 | 维沃移动通信有限公司 | Display adjusting method and terminal |
| CN110208980A (en) * | 2019-05-14 | 2019-09-06 | 深圳市华星光电技术有限公司 | Liquid crystal display |
Citations (6)
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|---|---|---|---|---|
| CN101713503A (en) * | 2008-10-07 | 2010-05-26 | 索尼株式会社 | Illuminating device, display device, and method of manufacturing light modulation element |
| CN102830521A (en) * | 2012-09-14 | 2012-12-19 | 京东方科技集团股份有限公司 | Display device and driving method thereof |
| CN102929037A (en) * | 2011-08-08 | 2013-02-13 | 索尼公司 | Display device, method of manufacturing same, and electronic apparatus |
| CN103033982A (en) * | 2011-10-05 | 2013-04-10 | 索尼公司 | Display unit |
| CN103851407A (en) * | 2012-11-28 | 2014-06-11 | 群康科技(深圳)有限公司 | Backlight module and liquid crystal display device |
| US8836888B2 (en) * | 2009-12-15 | 2014-09-16 | Gentex Corporation | Modular light source/electronics and automotive rearview assemblies using the same |
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2016
- 2016-09-05 CN CN201610804233.6A patent/CN106125404B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101713503A (en) * | 2008-10-07 | 2010-05-26 | 索尼株式会社 | Illuminating device, display device, and method of manufacturing light modulation element |
| US8836888B2 (en) * | 2009-12-15 | 2014-09-16 | Gentex Corporation | Modular light source/electronics and automotive rearview assemblies using the same |
| CN102929037A (en) * | 2011-08-08 | 2013-02-13 | 索尼公司 | Display device, method of manufacturing same, and electronic apparatus |
| CN103033982A (en) * | 2011-10-05 | 2013-04-10 | 索尼公司 | Display unit |
| CN102830521A (en) * | 2012-09-14 | 2012-12-19 | 京东方科技集团股份有限公司 | Display device and driving method thereof |
| CN103851407A (en) * | 2012-11-28 | 2014-06-11 | 群康科技(深圳)有限公司 | Backlight module and liquid crystal display device |
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| Publication number | Publication date |
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| CN106125404A (en) | 2016-11-16 |
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