CN201616938U - Backlight device and electronic equipment - Google Patents
Backlight device and electronic equipment Download PDFInfo
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- CN201616938U CN201616938U CN2010200005430U CN201020000543U CN201616938U CN 201616938 U CN201616938 U CN 201616938U CN 2010200005430 U CN2010200005430 U CN 2010200005430U CN 201020000543 U CN201020000543 U CN 201020000543U CN 201616938 U CN201616938 U CN 201616938U
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Abstract
The embodiment of the utility model discloses backlight device and electronic equipment which relate to the technical field of electronics and are designed for automatically adjusting the backlight brightness and improving the system reliability according to the difference of environmental lights. The backlight device includes a backlight and a constant flow source connected with the backlight and providing a drive circuit for the backlight; the backlight also includes an adjuster which is connected with the constant flow source and includes a photoconductive resistance; the adjuster uses the photoconductive characteristics of the photoconductive resistance to adjust the drive circuit of the backlight outputted by the constant flow source. The embodiment of the utility model also provides electronic equipment. The utility model can be used in equipment including the backlight device.
Description
Technical field
The utility model relates to electronic technology field, relates in particular to a kind of backlight apparatus and electronic equipment.
Background technology
Backlight apparatus is the important component part of the display floater of equipment such as LCD, mobile phone, LCD TV, for display floater provides light source.Since the environment difference, the strong and weak difference of light, and existing backlight apparatus is typically provided with the function according to surround lighting discrepancy adjustment brightness of backlight.When ambient light was relatively strong, the contrast that human eye is experienced can descend, and backlight apparatus increased brightness of backlight and improved contrast this moment, made human eye can clearly obtain image information on the display floater; And when ambient light was more weak, backlight apparatus reduced brightness of backlight, made the luminance adaptation perception of human eyes ability of display floater, and saved electric weight.
In the prior art, with the mobile phone is example, backlight apparatus generally adopts backlight drive IC (integrated circuit) such as constant-current source that the drive current of backlight is provided, by photoelectric sensing IC and ADC (A-D converter) are set in backlight apparatus, photoelectric sensing IC gathers the environment light intensity, ADC converts light intensity signal to digital signal, the grade of the current environment light that cell phone system software obtains according to ADC, the drive current that constant-current source provides is set, realizes function according to surround lighting discrepancy adjustment brightness of backlight.But, software will constantly detect current light intensity grade and the real-time frequent drive current that constant-current source provides that is provided with, and goes to regulate the brightness of backlight, so not only occupying system resources, and causing configuration error easily in the handoff procedure that is provided with, reliability is relatively poor.
The utility model content
The main purpose of the utility model embodiment is, a kind of backlight apparatus is provided, and can improve the reliability of system automatically according to surround lighting discrepancy adjustment brightness of backlight.
For achieving the above object, embodiment of the present utility model adopts following technical scheme:
A kind of backlight apparatus, comprise backlight and the constant-current source that is connected with backlight, drive current is provided for backlight, described backlight apparatus also comprises that be connected, that comprise photo resistance adjusting device with described constant-current source, described adjusting device is utilized the light sensitive characteristic of described photo resistance, regulates the backlight drive current of described constant-current source output.
After adopting technique scheme, compare the backlight apparatus that the utility model embodiment provides with prior art, light sensitive characteristic by photo resistance, can regulate the backlight drive current of constant-current source output automatically according to surround lighting difference, and then adjust the brightness of backlight.Need not extra photoelectric sensing IC and ADC, reduced cost.And, adopt pure hardware adjustments mode in the use, need not software and participate in light intensity detection and judgement, do not take the software systems resource, reduced system burden, improved the reliability of system.
Another main purpose of the utility model embodiment is, a kind of electronic equipment is provided, and can improve the reliability of system automatically according to surround lighting discrepancy adjustment brightness of backlight.
For achieving the above object, embodiment of the present utility model adopts following technical scheme:
A kind of electronic equipment, comprise display floater and the backlight apparatus of light source is provided for display floater, described backlight apparatus comprises backlight and the constant-current source that is connected with backlight, drive current is provided for backlight, described backlight apparatus also comprises that be connected, that comprise photo resistance adjusting device with described constant-current source, described adjusting device is utilized the light sensitive characteristic of described photo resistance, regulates the backlight drive current of described constant-current source output.
After adopting technique scheme, compare the electronic equipment that the utility model embodiment provides with prior art, light sensitive characteristic by photo resistance, can regulate the backlight drive current of constant-current source output automatically according to surround lighting difference, adjust the brightness of backlight, and then the contrast of regulating display floater, adopt pure hardware adjustments mode in the use, need not software and participate in light intensity detection and judgement, do not take the software systems resource, reduce system burden, improved reliability.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The structured flowchart of the backlight apparatus that Fig. 1 provides for the utility model embodiment;
The circuit diagram of the backlight apparatus that Fig. 2 provides for the utility model embodiment;
The structured flowchart of the electronic equipment that Fig. 3 provides for the utility model embodiment;
Fig. 4 is the embodiment schematic diagram of the utility model electronic equipment;
Fig. 5 is the another embodiment schematic diagram of the utility model electronic equipment.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
For can be automatically according to surround lighting discrepancy adjustment brightness of backlight, improve reliability and also reduce cost, the utility model embodiment provides a kind of backlight apparatus.
The backlight apparatus that the utility model embodiment provides, as shown in Figure 1, comprise backlight 1 and constant-current source 21 that be connected with backlight, that drive current is provided for backlight 1, also comprise 2 that be connected with constant-current source, as to comprise photo resistance 31 adjusting device 3, adjusting device 3 is utilized the light sensitive characteristic of photo resistance 31, regulates the backlight drive current of constant-current source 2 outputs.
Photo resistance is a kind of resistor that utilizes semi-conductive photoelectric effect to make, and it has light sensitive characteristic, and promptly its resistance value changes with the power of incident light, and incident light strengthens, and the resistance of photo resistance reduces, and incident light weakens, and resistance increases.In dark surrounds, the resistance value of photo resistance is very high, when being subjected to illumination, as long as photon energy then can transit to conduction band behind the energy of a photon of the Electron absorption in the valence band greater than the energy gap of semi-conducting material, and in valence band, produce a positively charged hole, this electron-hole pair that is produced by illumination has increased the number of charge carrier in the semi-conducting material, and its resistivity is diminished, thereby causes the photo resistance resistance to descend, illumination is stronger, and resistance is lower.After incident light disappears, will be compound gradually by the electron-hole pair that photon excitation produces, the resistance of photo resistance be also just recovered initial value gradually.
In backlight apparatus, the constant-current source of drive current is provided for backlight, characteristic according to its chip, except by the software arrangements corresponding digital interface control output current, the resistance to earth at ISET pin place that can also be by configuration constant-current source chip is realized the control to the drive current of output.This is that the electric current that flows through the ISET pin is inversely proportional to the resistance to earth at this pin place because when the constant-current source chip was in running order, the ISET pin can be exported a constant voltage.And constant-current source flows through the electric current of ISET pin and is directly proportional with the electric current that the drive current of output promptly flows through backlight, and proportionality coefficient is a fixing constant, determines by the constant-current source chip is unique.Based on this, a kind of backlight apparatus that the utility model embodiment provides, light sensitive characteristic by photo resistance 31, can be automatically according to surround lighting difference, change the resistance to earth at ISET pin place, thereby change the electric current that flows through the ISET pin, and then change the drive current of constant-current source 2 outputs, changed the brightness of backlight 1.Need not extra photoelectric sensing IC and ADC are set, reduced cost.And, adopt pure hardware adjustments mode in the application process, need not software and participate in light intensity detection and judgement, do not take the software systems resource, reduced system burden, improved the reliability of system.
Below by specific embodiment backlight apparatus of the present utility model is described in detail.
Here adopt circuit diagram shown in Figure 2 that present embodiment is described in detail, as shown in Figure 2, the backlight apparatus that present embodiment provides comprises backlight D1 and the constant-current source U1 that is connected with backlight D1, drive current is provided for backlight D1, also comprise the adjusting device 3 that is connected with constant-current source U1, comprise photo resistance RL1, adjusting device 3 is utilized the light sensitive characteristic of photo resistance RL1, can be automatically according to surround lighting difference, regulate the backlight drive current of constant-current source U1 output, and then adjust the brightness of backlight D1.
Wherein, adjusting device 3 is connected with the ISET pin of constant-current source U1.Adjusting device 3 comprises regulating circuit, and referring to Fig. 2, described regulating circuit is made of with shunt resistance R1 is in parallel the transistor amplifier that comprises photo resistance RL1.Wherein, the end of photo resistance RL1 connects with the base stage B of triode Q1, and the other end is by the collector electrode C connection of protective resistance R2 with triode Q1, the emitter E ground connection of triode Q1.
During application, constant-current source U1 is in running order, constant voltage of ISET pin output, and the electric current that the output current of D1 ' port of constant-current source U1 promptly flows through backlight D1 is proportional to the electric current that flows through the ISET pin.When light intensity is more weak, the resistance of photo resistance RL1 is very big, and the base current that flows through triode Q1 is very little, and the collector current of triode Q1 is also very little, the electric current that flows through backlight D1 this moment is mainly determined by shunt resistance R1, is approximately the electric current that flows through shunt resistance R1; When light strengthens, photo resistance RL1 resistance diminishes, the base current that flows through triode becomes big, it is big that the transistor collector electric current also becomes thereupon, the electric current that flow through the ISET pin this moment is electric current and the transistor collector electric current sum of shunt resistance R1, the electric current that flows through backlight D1 increases thereupon, thereby plays the effect that increases electric current, improves contrast when the ambient light grow.
Wherein, the resistance value scope of photo resistance RL1, the resistance value of shunt resistance R1, protective resistance R2 requires to select according to side circuit design conditions and different constant-current source characteristics.
Further, shunt resistance R1 can be made as variable resistor.When environmental light intensity one timing, the user can change the electric current that flows through the ISET pin by regulating the resistance value of shunt resistance R1, and then regulates the brightness of backlight D1, the visual effect of acquisition expectation.
Here be noted that present embodiment for technical scheme and principle are described, only comprises a backlight D1.But embodiment of the present utility model is not limited thereto, and reality can comprise a plurality of backlights.
Correspondingly, the utility model embodiment also provides a kind of electronic equipment, as shown in Figure 3, comprise display floater 4 and the backlight apparatus 5 of light source is provided for display floater 4, backlight apparatus 5 comprises backlight 1 and constant-current source 21 that be connected with backlight, that drive current is provided for backlight 1, also comprise 2 that be connected with constant-current source, as to comprise photo resistance 31 adjusting device 3, adjusting device 3 is utilized the light sensitive characteristic of photo resistance 31, regulates the backlight drive current of constant-current source 2 outputs.
Like this, the electronic equipment that the utility model embodiment provides is by the light sensitive characteristic of photo resistance 31, can be automatically according to surround lighting difference, regulate the backlight drive current of constant-current source 2 outputs, adjust the brightness of backlight 1, and then regulate the contrast of display floater 4.Need not extra photoelectric sensing IC and ADC are set, reduced cost.And, adopt pure hardware adjustments mode in the use, need not software and participate in light intensity detection and judgement, do not take the software systems resource, reduced system burden, improve the reliability of system.
Wherein, the backlight apparatus that backlight apparatus 5 has adopted the utility model embodiment to provide, the front has been described in detail, and is not giving unnecessary details here.
Wherein, photo resistance 31 will be accepted surround lighting in real time, experiences the variation of surround lighting, regulate the contrast of display floater 4, therefore in the electronic equipment that the utility model embodiment provides, photo resistance 31 will be positioned on the photosurface, accepts surround lighting by light transmission device.Preferably, described photo resistance will be positioned on the identical photosurface with display floater 4, and on identical photosurface, preferably, photo resistance will be positioned near on the position of display floater 4.Like this, the surround lighting of the photo resistance 31 impressions just surround lighting with display floater 4 impressions is identical, can regulate the contrast of display floater 4 more accurately along with the variation of surround lighting.
Further, the electronic equipment that provides of this enforcement new embodiment can comprise the equipment of backlight apparatus for mobile phone, DPF, LCD, LCD TV etc.Fig. 4 and Fig. 5 show the schematic diagram of the specific embodiment of the utility model electronic equipment.
Among Fig. 4, the electronic equipment that the utility model embodiment provides is a mobile phone 6, as shown in Figure 4, mobile phone 6 comprises that display floater is a display screen 4, also being included as display screen 4 provides the backlight apparatus of light source, photo resistance 31 in the backlight apparatus is positioned at the upper right side of display screen 4, and backlight apparatus is by the brightness of the light sensitive characteristic adjusting backlight of photo resistance 31, and then the contrast of regulating display screen 4.Wherein, photo resistance 31 is positioned on the same photosurface with display screen 4, and adjacent with display screen 2.
Among Fig. 5, the electronic equipment that the utility model embodiment provides is a DPF 7, as shown in Figure 5, DPF 7 comprises that display floater is a display screen 4, also being included as display screen 4 provides the backlight apparatus of light source, photo resistance 31 in the backlight apparatus is positioned at the upper right side of display screen 4, and backlight apparatus is by the brightness of the light sensitive characteristic adjusting backlight of photo resistance 31, and then the contrast of regulating display screen 4.Wherein, photo resistance 31 is positioned on the same photosurface with display screen 4, and adjacent with display screen 4.
Be understandable that, though the electronic equipment that the utility model embodiment provides is that the equipment that has a CPU with mobile phone, DPF etc. is that example is set forth, but the utility model is not limited thereto, described electronic equipment also can be the equipment that does not have CPU, the keyboard that for example has backlight apparatus, night lamp etc.
The above; it only is embodiment of the present utility model; but protection range of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; can expect easily changing or replacing, all should be encompassed within the protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range of described claim.
Claims (10)
1. backlight apparatus, comprise backlight and the constant-current source that is connected with backlight, drive current is provided for backlight, it is characterized in that, described backlight apparatus also comprises that be connected, that comprise photo resistance adjusting device with described constant-current source, described adjusting device is utilized the light sensitive characteristic of described photo resistance, regulates the backlight drive current of described constant-current source output.
2. backlight apparatus according to claim 1 is characterized in that, described adjusting device is connected with the ISET pin of described constant-current source.
3. backlight apparatus according to claim 2 is characterized in that,
Described adjusting device comprises regulating circuit;
Described regulating circuit constitutes by the transistor amplifier that comprises photo resistance is in parallel with shunt resistance;
One end of described photo resistance connects with the base stage of triode, and the other end connects by the collector electrode of protective resistance with described triode;
The grounded emitter of described triode.
4. backlight apparatus according to claim 3 is characterized in that, described shunt resistance is a variable resistor.
5. electronic equipment, comprise display floater and the backlight apparatus of light source is provided for display floater, described backlight apparatus comprises backlight and the constant-current source that is connected with backlight, drive current is provided for backlight, it is characterized in that, described backlight apparatus also comprises that be connected, that comprise photo resistance adjusting device with described constant-current source, described adjusting device is utilized the light sensitive characteristic of described photo resistance, regulates the backlight drive current of described constant-current source output.
6. electronic equipment according to claim 5 is characterized in that, described display floater is positioned at identical photosurface with described photo resistance.
7. electronic equipment according to claim 5 is characterized in that, described adjusting device is connected with the ISET pin of described constant-current source.
8. electronic equipment according to claim 7 is characterized in that,
Described adjusting device comprises regulating circuit;
Described regulating circuit constitutes by the transistor amplifier that comprises photo resistance is in parallel with shunt resistance;
One end of described photo resistance connects with the base stage of triode, and the other end connects by the collector electrode of protective resistance with described triode;
The grounded emitter of described triode.
9. electronic equipment according to claim 8 is characterized in that, described shunt resistance is a variable resistor.
10. electronic equipment according to claim 5 is characterized in that, described electronic equipment is mobile phone, DPF, LCD, LCD TV or keyboard.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200005430U CN201616938U (en) | 2010-01-07 | 2010-01-07 | Backlight device and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200005430U CN201616938U (en) | 2010-01-07 | 2010-01-07 | Backlight device and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN201616938U true CN201616938U (en) | 2010-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010200005430U Expired - Lifetime CN201616938U (en) | 2010-01-07 | 2010-01-07 | Backlight device and electronic equipment |
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| Country | Link |
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| CN (1) | CN201616938U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102542995A (en) * | 2010-12-22 | 2012-07-04 | 深圳富泰宏精密工业有限公司 | Backlight regulating circuit |
| CN103578431A (en) * | 2012-08-06 | 2014-02-12 | 纬创资通股份有限公司 | Backlight driving circuit and backlight driving method |
| CN104202865A (en) * | 2014-07-29 | 2014-12-10 | 福建歌航电子信息科技有限公司 | Intelligent lighting device |
| CN104540289A (en) * | 2014-12-29 | 2015-04-22 | 联想(北京)有限公司 | Backlight display control method and electronic device |
| WO2018103253A1 (en) * | 2016-12-09 | 2018-06-14 | 华为技术有限公司 | Mobile device, backlight control method thereof, and flash calibration method and apparatus thereof |
| CN109192180A (en) * | 2018-09-05 | 2019-01-11 | 珠海格力电器股份有限公司 | The display device and its control method and electric appliance of a kind of automatic brightness adjustment |
| CN112750404A (en) * | 2019-10-30 | 2021-05-04 | 深圳Tcl数字技术有限公司 | Brightness adjusting circuit, method and display device of indicator light and backlight |
| CN112788809A (en) * | 2019-10-23 | 2021-05-11 | 致伸科技股份有限公司 | Light brightness adjusting device |
-
2010
- 2010-01-07 CN CN2010200005430U patent/CN201616938U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102542995A (en) * | 2010-12-22 | 2012-07-04 | 深圳富泰宏精密工业有限公司 | Backlight regulating circuit |
| CN103578431A (en) * | 2012-08-06 | 2014-02-12 | 纬创资通股份有限公司 | Backlight driving circuit and backlight driving method |
| CN103578431B (en) * | 2012-08-06 | 2015-07-15 | 纬创资通股份有限公司 | Backlight driving circuit and backlight driving method |
| CN104202865A (en) * | 2014-07-29 | 2014-12-10 | 福建歌航电子信息科技有限公司 | Intelligent lighting device |
| CN104540289A (en) * | 2014-12-29 | 2015-04-22 | 联想(北京)有限公司 | Backlight display control method and electronic device |
| CN104540289B (en) * | 2014-12-29 | 2017-08-29 | 联想(北京)有限公司 | A kind of backlight display control method and electronic equipment |
| WO2018103253A1 (en) * | 2016-12-09 | 2018-06-14 | 华为技术有限公司 | Mobile device, backlight control method thereof, and flash calibration method and apparatus thereof |
| CN109192180A (en) * | 2018-09-05 | 2019-01-11 | 珠海格力电器股份有限公司 | The display device and its control method and electric appliance of a kind of automatic brightness adjustment |
| CN112788809A (en) * | 2019-10-23 | 2021-05-11 | 致伸科技股份有限公司 | Light brightness adjusting device |
| CN112750404A (en) * | 2019-10-30 | 2021-05-04 | 深圳Tcl数字技术有限公司 | Brightness adjusting circuit, method and display device of indicator light and backlight |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20171115 Address after: Metro Songshan Lake high tech Industrial Development Zone, Guangdong Province, Dongguan City Road 523808 No. 2 South Factory (1) project B2 -5 production workshop Patentee after: HUAWEI terminal (Dongguan) Co., Ltd. Address before: 518129 Longgang District, Guangdong, Bantian HUAWEI base B District, building 2, building No. Patentee before: Huawei Device Co., Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 523808 Southern Factory Building (Phase I) Project B2 Production Plant-5, New Town Avenue, Songshan Lake High-tech Industrial Development Zone, Dongguan City, Guangdong Province Patentee after: Huawei Device Co., Ltd. Address before: 523808 Southern Factory Building (Phase I) Project B2 Production Plant-5, New Town Avenue, Songshan Lake High-tech Industrial Development Zone, Dongguan City, Guangdong Province Patentee before: HUAWEI terminal (Dongguan) Co., Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101027 |