CN202512856U - Backlight control device and display device using same - Google Patents
Backlight control device and display device using same Download PDFInfo
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- CN202512856U CN202512856U CN2012200878370U CN201220087837U CN202512856U CN 202512856 U CN202512856 U CN 202512856U CN 2012200878370 U CN2012200878370 U CN 2012200878370U CN 201220087837 U CN201220087837 U CN 201220087837U CN 202512856 U CN202512856 U CN 202512856U
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- backlight
- electric signal
- filtering
- backlight control
- integration
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Abstract
Provided are a backlight control device and a display device. The backlight control device includes the following components of: a light sensing unit used for sensing ambient light to generate electrical signals which are corresponding to the intensity of the ambient light; a filtering and integrating unit used for performing filtering and integration on the generated electrical signals; a comparing unit used for comparing the filtered and integrated electrical signals with a predetermined threshold value; and a control unit used for generating backlight control signals based on a comparison result. Backlight is controlled according to changes of the intensity of the ambient light, such that the power consumption of the display device is significantly decreased.
Description
Technical field
The utility model relates to backlight control, relate in particular to a kind of based on the environment light intensity to the device of controlling backlight with use its display device.
Background technology
In electronics industry, backlight is a kind of form of illumination.Demonstration backlight is meant that display screen on the electronic equipment or guidance panel send backlight when using electronic equipment, so that more clearly displaying contents or operand.
Demonstration backlight is used to increase the brightness on illuminance and computer monitor, the liquid crystal screen.Its light source possibly be incandescent lamp bulb, electrooptic panel (ELP), light emitting diode (LED), cold-cathode tube (CCFL) etc.
With the LED-backlit is example, and it can be used on LCD (LCD) panel, thereby promotes the color representation of LCD display device.
The utility model content
Yet, when the display device such as the LCD panel is in the high lighting environment, promptly; The brightness of surround lighting is enough high, thereby under not having more weak situation backlight or backlight also clearly during displaying contents, perhaps; When the user leaves and no longer watches display device; Keep backlight opening, perhaps, will bring unnecessary power consumption the high brightness that remains on backlight.This especially has very big influence to the stand-by time of battery-powered portable set such as mobile phone.
Consider top problem, the display device that the purpose of the utility model provides a kind of backlight control apparatus and uses it makes when the environment light intensity reaches predeterminated level, changes brightness backlight, thereby saves the consumption of electric power.
An aspect of the utility model provides a kind of backlight control apparatus, comprising: light sensing unit is used for sense ambient light to produce and the corresponding electric signal of ambient light intensity; Filtering and integral unit are used for the electric signal that is produced is carried out filtering and integration; Comparing unit is used for comparing with predetermined threshold through the electric signal of filtering and integration; Control module is used for producing backlight control signal according to comparative result.
Another aspect of the utility model provides a kind of backlight control apparatus, comprising: light sensing unit is used for sense ambient light to produce and the corresponding electric signal of ambient light intensity; Filtering and integral unit are used for the electric signal that is produced is carried out filtering and integration; Storage unit, be used to store a plurality of preset values and with the interval corresponding backlight illumination information that limits a plurality of preset values; Comparing unit is used for comparing with a plurality of preset values through the electric signal of filtering and integration; Control module; Be used for producing backlight control signal according to comparative result; Wherein, Control module is arranged in the comparative result between the given zone in interval of a plurality of preset values through the electric signal of filtering and integration according to indication, generation be used for backlight be adjusted to and given zone between the backlight control information of the indicated brightness of corresponding backlight illumination information.
Another aspect of the utility model provides a kind of display device, and it comprises the backlight control apparatus according to above-mentioned each side.Wherein, this display device is regulated backlight according to the backlight control information from this backlight control apparatus.
Use the utility model, make it possible to surround lighting control brightness backlight, thereby when keeping good display effect, reduce power consumption based on display device.
Description of drawings
With reference to below in conjunction with the explanation of accompanying drawing, can understand the above of the utility model and other purpose, characteristics and advantage to the embodiment of the utility model with being more prone to.In the accompanying drawings, technical characterictic or parts identical or correspondence will adopt identical or corresponding Reference numeral to represent.Needn't go out the size and the relative position of unit in the accompanying drawings according to scale.
Fig. 1 is the structured flowchart that illustrates according to the backlight control apparatus of the utility model first embodiment.
Fig. 2 is the process flow diagram that illustrates according to the method for controlling backlight thereof of the utility model first embodiment.
Fig. 3 is the structured flowchart that illustrates according to the backlight control apparatus of the utility model second embodiment.
Fig. 4 is the process flow diagram that illustrates according to the method for controlling backlight thereof of the utility model second embodiment.
Embodiment
The embodiment of the utility model is described with reference to the accompanying drawings.Should be noted that for purpose clearly, omitted in accompanying drawing and the explanation and the utility model expression and description irrelevant, parts well known by persons skilled in the art and processing.
Fig. 1 is the structured flowchart that illustrates according to the backlight control apparatus 100 of the utility model first embodiment.As shown in Figure 1, backlight control apparatus 100 comprises: light sensing unit 101, filtering and integral unit 102, comparing unit 103 and control module 104.
Light sensing unit 101 sense ambient light are to produce and the corresponding electric signal of ambient light intensity.For example, light sensing unit 101 can comprise photodiode (LED).Exposure intensity in response to surround lighting changes, and the size of the photocurrent among the LED takes place by corresponding the variation, thereby produces corresponding electric signal.The object lesson of LED is a silicon photo diode.Silicon photo diode is a semiconductor photodetector.When the P-N in the semiconductor ties by rayed, can produce the curtage signal.The size of this curtage signal is along with the exposure intensity of surround lighting changes.Certainly, light sensing unit can also be that any other can convert light signal to the device of electric signal.
102 pairs of electric signal that produced by light sensing unit 101 of filtering and integral unit carry out filtering and integral processing.Owing to have the noise that causes by a variety of causes in the electric signal of generations such as LED, thereby need to use filtering and 102 pairs of noises of integral unit to carry out filtering, and electric signal is carried out smoothly.Then, will offer comparing unit 103 through the electric signal behind filtering and the integration.
Filtering and integral unit 102 can use various device known in the art or circuit structure to build.
Electric signal and predetermined threshold that comparing unit 103 will pass through filtering and integration compare, and comparative result is outputed to control module 104.Comparing unit 103 can use various device known in the art or circuit to realize.For example, simple example is to use operational amplifier as comparer.For example, an input of operational amplifier is the output electric signal of filtering and integral unit 102, and another input is predetermined threshold voltage, and the voltage of the high-low level that operational amplifier is exported indication electric signal and the comparative result of threshold voltage.
Control module 104 produces backlight control signal according to comparative result.For example, when using the LCD display panel, in the time of in being in well-lighted environment, need not open backlightly, can clearly watch content displayed on the LCD display panel yet.Thereby; Be configured; Make the resulting comparative results indication of control module 104 through the electric signal of filtering and integral processing greater than predetermined threshold (that is, and ambient light intensity greater than with the corresponding predetermined strength of this predetermined threshold) time, the control module generation is used to close backlight control signal backlight.On the contrary, when the LCD display panel was in environment with dark light, the electric signal of the comparative result of comparing unit 103 indication process filtering and integral processing was less than (equaling) this predetermined threshold.At this moment, control module 104 produces and is used to open backlight or with the backlight control signal that is set to high brightness backlight.
The example of another one application scenarios is: LED provides guidance panel backlight of electronic installation.Thereby block the component environment light time when operating personnel walk close to guidance panel, comparing unit 103 obtains indicating through the electric signal of filtering and the integral processing comparative result less than predetermined threshold, and is entered into control module 104.Control module 104 is according to this result, and decision operation personnel close on guidance panel operating, thereby the opening operation panel is backlight.On the contrary, when operating personnel left, the surround lighting that shines on the guidance panel recovered normal value (greater than predetermined luminance).Thereby control module is according to the comparative result of indication electric signal greater than predetermined threshold, and decision operation personnel are the leave operation panel, closes with the backlight of control operation panel thereby produce control signal.
Fig. 2 is the process flow diagram that illustrates according to the method for controlling backlight thereof of the utility model first embodiment.
In step S201, sense ambient light is to produce and the corresponding electric signal e of ambient light intensity.This step can adopt the photoelectric device of the curtage that changes in response to the intensity of illumination variation to accomplish.Such as, LED particularly, can be a silicon photo diode.
In step S202, the electric signal e that is produced is carried out filtering and integration, to obtain electric signal e ' through filtering and integration.The purpose of this step is to eliminate the signal distortion that noise causes, and signal e is carried out smoothly, for further use.
In step S203, the electric signal e ' that will pass through filtering and integration compares with predetermined threshold value E.
In an example, under the situation of unglazed photograph, the magnitude of voltage of the electric signal that is produced by photoelectric device is about 2.84V, and after filtering and integral processing, the magnitude of voltage of electric signal is about 2.19V; And under light conditions, the magnitude of voltage of the electric signal that is produced by photoelectric device is about 3.21V, and after filtering and integral processing, this magnitude of voltage is about 2.81V.Therefore, in this example, can threshold value be confirmed as 2.5V (2.19V and 2.81V are averaged).Certainly, above-mentioned threshold value confirms that mode is exemplary, can also adopt the mode of any definite threshold value as required.
As shown in Figure 2, control backlight according to the comparative result among the step S203.Particularly, for example,, carry out first backlight control scheme as electric signal e ' during greater than threshold value E.For example, in step S204, send control signal, indication keeps backlight and closes, closes backlight or be adjusted to low-light level with backlight.On the contrary, as electric signal e ' during smaller or equal to threshold value E, promptly in S203 for not the time, carry out second backlight control scheme.For example, in step S205, send control signal, indication keeps backlight and opens, opens backlight or with the high brightness that is adjusted to backlight.Certainly, according to different application scenarios, also can during greater than threshold value E, in step S204, send control signal at electric signal e ', indication is opened or lightens backlight; And during smaller or equal to threshold value E, in step S205, send control signal at electric signal e ', indication is closed or dims backlight.Can confirm according to concrete needs.
With reference to figure 1 and Fig. 2 backlight control apparatus and method according to the utility model first embodiment have been described above.In first embodiment, compare through electric signal and the single threshold value of filtering and integral processing, definite according to comparative result to control backlight (close or open, dim or lighten, or the maintenance backlight state is constant etc.).Utilize first embodiment, can realize that the utility model changes according to surround lighting to control, to reduce the advantage of power consumption to backlight.
Yet, when backlight can be on more intensity levels staged when regulating, can preestablish more threshold value, set some intervals in other words, and regulate backlight according to different intervals.Hereinafter, describe with reference to figure 3 and Fig. 4.
Fig. 3 is the structured flowchart that illustrates according to the backlight control apparatus 300 of the utility model second embodiment.Backlight control apparatus 300 comprises: light sensing unit 301, filtering and integral unit 302, comparing unit 303, control module 304 and storage unit 305.
Wherein, light sensing unit 301 sense ambient light are to produce and the corresponding electric signal of ambient light intensity.And 302 pairs of electric signal that produced by light sensing unit 301 of filtering and integral unit carry out filtering and integral processing.Light sensing unit 101 among their function and the structure and first embodiment is identical with function and the structure of filtering and integral unit 102, therefore, and the omission detailed description.
Storage unit 305 be used to store a plurality of preset values and with the interval corresponding backlight illumination information that limits these a plurality of preset values.In an example, storage unit 305 stores preset value E1=2V, E2=2.3V, E3=2.6V, E4=2.9V, and is each interval of end points and the mapping between the corresponding backlight illumination grade with the preset value.This mapping for example is: [0,2V] → brightness degree 1, (2V, 2.3V] → brightness degree 2, (2.3V, 2.6V] → brightness degree 3, (2.6V, 2.9V] → brightness degree 4, (2.9V ,+∞] → brightness degree 5.In this example, brightness degree i (i=1～5) corresponds respectively to different backlight brightness (can be that unit calculates with every square metre of candela for example).Brightness backlight can be successively decreased along with the increase of i among the brightness degree i (i=1～5), perhaps increases progressively.
Comparing unit 303 will pass through the preset value of storing in electric signal and the storage unit of filtering and integration and compare, and with the interval of confirming that this electric signal is fallen into, and comparative result outputed to control module 304.Comparing unit 303 can use various device known in the art or circuit to realize.With simple configuration is example; Can each a input end of some amplifiers be parallel-connected to the output of filtering and integral unit 302; Their other end is connected respectively to the reference voltage of each preset value, and then the ordered sequence of the output of these some amplifiers promptly can be used as the comparative result of comparing unit 303.
Control module 304 produces backlight control signal according to comparative result.Specifically; Control module 304 is arranged in the comparative result between the given zone in interval of a plurality of preset values through the electric signal of filtering and integration according to indication, generation be used for backlight be adjusted to and this given zone between the backlight control information of the indicated brightness of corresponding backlight illumination information.
In the above example; The voltage of the electric signal e that supposes to be produced by light sensing unit 301 is 2.96V; And the voltage of process filtering and integral unit 302 processed electrical signals e ' is 2.56V; Then comparing unit 303 compares the preset value of storing in 2.56V and the storage unit, and comparative result is offered control module 304.This comparative result will show the voltage (2.56V) of electric signal e ' fall into the interval (2.3V, 2.6V] in.Control module 304 can be according to this comparative result, stored mapping in the reading cells 305, find with interval (2.3V, 2.6V] corresponding brightness degree 3, and produce the backlight control information that is adjusted to brightness degree 3 corresponding brightness backlight.
Storage unit 305 can be used RAM (RAS), DRAM (dynamic RAM), FLASH (flash memory) and EEPROM realizations such as (electrically erasable read-only memories).
Fig. 4 is the process flow diagram that illustrates according to the method for controlling backlight thereof of the utility model second embodiment.
In step S401, sense ambient light is to produce and the corresponding electric signal e of ambient light intensity.In step S402, electric signal e is carried out filtering and integration, to generate electric signal e '.The processing of carrying out among the processing of in step S401 and S402, carrying out and step S201 that combines Fig. 2 explanation and the S202 is identical, therefore, omits its detailed description.
In step S403, will pass through the electric signal e ' of filtering and integration and compare with a plurality of preset value Em (m is a natural number) that store in advance.Wherein, the interval that is limited these a plurality of preset value Em is corresponding with different backlight brightness information.
Still describe with top example.Known a plurality of preset value E1=2V, E2=2.3V, E3=2.6V, the E4=2.9V of existing.The interval that these a plurality of preset values limit has: [0,2V], (2V, 2.3V], (2.3V, 2.6V], (2.6V, 2.9V] and (2.9V ,+∞].These 5 intervals are corresponding with different backlight brightness information respectively.Such as them successively corresponding to brightness degree 1, brightness degree 2, brightness degree 3, brightness degree 4 and brightness degree 5.Different brightness levels can correspond respectively to different backlight brightness.
In this example; In step S403; The electric signal e ' that will pass through filtering and integration compares with 4 preset value E1=2V, E2=2.3V, E3=2.6V, E4=2.9V, and falling into Em (m=1～4) with the voltage that draws indication electric signal e ' is the comparative result in which interval of end points.
In step S404, be arranged in the comparative result between the given zone in the interval that limits a plurality of preset value Em through the electric signal e ' of filtering and integration according to indication, with backlight be adjusted to and this given zone between the indicated brightness of corresponding backlight illumination information.For example, when the voltage of electric signal e ' is 2.56V, in step S403, obtain indicating electric signal e ' fall into the interval (2.6V, 2.9V] in comparative result.Then, in step S404,, be adjusted to and brightness degree 3 corresponding brightness backlight according to this comparative result.
Combine Fig. 3 and Fig. 4 that second embodiment of the utility model has been described above.Second embodiment compares with first embodiment, except that having saved unnecessary power consumption, has also strengthened the dirigibility of adjusting backlight.
Backlight control apparatus and method according to first and second embodiment can be applied to normal lighting, various display device, and such as the guidance panel of keypad.For example, display device can comprise the backlight control apparatus according to the utility model first and second embodiment.It can be backlight according to regulating from the backlight control information of this backlight control apparatus, thereby reduce the overall power consumption of display.
With reference to specific embodiment the utility model has been described in the instructions in front.Yet those of ordinary skill in the art understands, and under the prerequisite of the scope that does not depart from the utility model that limits like claims, can carry out various modifications and change.
Claims (6)
1. backlight control apparatus comprises:
Light sensing unit is used for sense ambient light to produce and the corresponding electric signal of ambient light intensity;
Filtering and integral unit are used for the electric signal that is produced is carried out filtering and integration;
Comparing unit is used for comparing with predetermined threshold through the said electric signal of filtering and integration;
Control module is used for producing backlight control signal according to comparative result.
2. backlight control apparatus according to claim 1, wherein, said light sensing unit comprises photodiode.
3. backlight control apparatus according to claim 2, wherein, said photodiode is a silicon photo diode.
4. according to any described backlight control apparatus in the claim 1 to 3, wherein, when said comparative result indication through the said electric signal of filtering and integration during greater than said predetermined threshold, said control module generation is used to close backlight control signal backlight.
5. backlight control apparatus comprises:
Light sensing unit is used for sense ambient light to produce and the corresponding electric signal of ambient light intensity;
Filtering and integral unit are used for the electric signal that is produced is carried out filtering and integration;
Storage unit, be used to store a plurality of preset values and with the interval corresponding backlight illumination information that limits said a plurality of preset values;
Comparing unit is used for comparing with said a plurality of preset values through the said electric signal of filtering and integration;
Control module is used for producing backlight control signal according to comparative result,
Wherein, Said control module is arranged in the comparative result between the given zone in interval of said a plurality of preset values through the said electric signal of filtering and integration according to indication, generation be used for backlight be adjusted to and said given zone between the backlight control information of the indicated brightness of corresponding backlight illumination information.
6. a display device comprises according to any described backlight control apparatus in the claim 1 to 5, and wherein, said display device is regulated backlight according to the backlight control information from said backlight control apparatus.
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| CN2012200878370U CN202512856U (en) | 2012-03-09 | 2012-03-09 | Backlight control device and display device using same |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103024197A (en) * | 2012-12-28 | 2013-04-03 | 广东欧珀移动通信有限公司 | Touch screen cellphone capable of preventing misoperations during calls and using method for touch screen cellphone |
| CN103310720A (en) * | 2012-03-09 | 2013-09-18 | 艾默生过程控制流量技术有限公司 | Backlight control device and method, and display device |
| CN103345907A (en) * | 2013-07-19 | 2013-10-09 | 国家电网公司 | Automatic regulator of LED backlight optical parameters based on ambient light detection |
| CN103730099A (en) * | 2013-12-09 | 2014-04-16 | 乐视致新电子科技（天津）有限公司 | Backlight intensity adjusting method and electronic device |
| CN106658687A (en) * | 2016-12-30 | 2017-05-10 | 深圳市文鼎创数据科技有限公司 | Method and device for optimizing power consumption of battery-powered device |
-
2012
- 2012-03-09 CN CN2012200878370U patent/CN202512856U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103310720A (en) * | 2012-03-09 | 2013-09-18 | 艾默生过程控制流量技术有限公司 | Backlight control device and method, and display device |
| CN103024197A (en) * | 2012-12-28 | 2013-04-03 | 广东欧珀移动通信有限公司 | Touch screen cellphone capable of preventing misoperations during calls and using method for touch screen cellphone |
| CN103024197B (en) * | 2012-12-28 | 2014-07-16 | 广东欧珀移动通信有限公司 | Touch screen cellphone capable of preventing misoperations during calls and using method for touch screen cellphone |
| CN103345907A (en) * | 2013-07-19 | 2013-10-09 | 国家电网公司 | Automatic regulator of LED backlight optical parameters based on ambient light detection |
| CN103730099A (en) * | 2013-12-09 | 2014-04-16 | 乐视致新电子科技（天津）有限公司 | Backlight intensity adjusting method and electronic device |
| CN106658687A (en) * | 2016-12-30 | 2017-05-10 | 深圳市文鼎创数据科技有限公司 | Method and device for optimizing power consumption of battery-powered device |
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Granted publication date: 20121031 Termination date: 20210309 |