CN102149234A - Backlight source control method and device - Google Patents
Backlight source control method and device Download PDFInfo
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- CN102149234A CN102149234A CN2010101104616A CN201010110461A CN102149234A CN 102149234 A CN102149234 A CN 102149234A CN 2010101104616 A CN2010101104616 A CN 2010101104616A CN 201010110461 A CN201010110461 A CN 201010110461A CN 102149234 A CN102149234 A CN 102149234A
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- brightness
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- illumination light
- backlight
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Abstract
The invention provides a backlight source control method and a backlight source control device. The method comprises the following steps of: detecting an illumination light generated by a backlight source in real time to generate a brightness feedback signal; according to the difference value between the brightness feedback signal and a preset brightness threshold value, generating a brightness regulation signal; performing a pulse width modulation on the brightness regulation signal to generate a brightness control signal; and controlling the brightness of the illumination light generated by the backlight source by the brightness control signal. In the embodiment of the invention, by detecting the illumination light generated by the backlight source in real time to generate the brightness feedback signal, negative feedback control over the illumination light of the backlight source is realized and brightness jump caused by temperature excursion is dynamically compensated, so the illumination light of the backlight source becomes stable and the visual effect of the illumination light is better.
Description
Technical field
The embodiment of the invention relates to technical field of liquid crystal display, relates in particular to a kind of backlight control method and device.
Background technology
LCD (Liquid Crystal Display, be called for short: LCD) be a kind ofly to utilize liquid crystal to power up to reverse the display that principle realizes that image shows, because liquid crystal molecule itself is not luminous, therefore, usually backlight will be set, by transmission or reflection mode display image, Fig. 1 is the structural representation of existing backlight, as shown in the figure, this backlight 10 comprises a plurality of light-emitting sections 11 and light guide plate 12.Wherein, light-emitting section 11 be RGB (Red Green Blue, be called for short: RGB)-light-emitting diode (LightEmitting Diode, be called for short: LED) lamp bar is used for realizing the demonstration backlight of wide colour gamut; Light guide plate (Light Guide) 12 is used for the light that light-emitting section 11 sends is evenly mixed, and provides illumination for LCD.
There are the following problems at least in the prior art: owing to there is the temperature drift phenomenon, make existing light-emitting section 11 be easy to produce the brightness saltus step, thereby the illumination light instability that causes backlight to produce influences visual effect.
Summary of the invention
The embodiment of the invention provides a kind of backlight control method and device, in order to stablize the illumination light that backlight produces.
The embodiment of the invention provides a kind of backlight control method, comprising:
Detect the illumination light generation brightness feedback signal that backlight produces in real time;
According to the difference generation brightness regulated signal of described brightness feedback signal with the luminance threshold of presetting;
Described brightness regulated signal is carried out pulse width modulation generate brightness control signal;
Control the brightness of the illumination light of described backlight generation by described brightness control signal.
Another embodiment of the present invention provides a kind of backlight source control device, comprising:
Transducer is used for detecting in real time the illumination light that backlight produces;
Analog to digital converter, the analog signal conversion that is used for transducer is obtained when detecting illumination light is a feedback signal;
Brightness regulator, the difference that is used for described brightness feedback signal that converts to according to analog to digital converter and the luminance threshold of presetting generates brightness regulated signal;
Pulse width modulator is used for the described brightness regulated signal that brightness regulator generates is carried out pulse width modulation, generates the brightness control signal of the brightness that is used to control described illumination light.
The illumination light that the embodiment of the invention produces by real-time detection backlight generates the brightness feedback signal and has realized the negative feedback of backlight illumination light is controlled, thereby can realize dynamic compensation to the brightness saltus step that temperature drift produces, the illumination light that backlight is produced becomes stable, and visual effect is better.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of existing backlight;
Fig. 2 is the flow chart of backlight control method embodiment of the present invention;
Fig. 3 is the structural representation of backlight source control device embodiment one of the present invention;
Fig. 4 is the internal structure schematic diagram of pulse width modulator shown in Fig. 3;
Fig. 5 is the structural representation of backlight source control device embodiment two of the present invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Fig. 2 is the flow chart of backlight control method embodiment of the present invention, and as shown in the figure, this method comprises the steps:
Particularly, can use luminance sensor to detect the brightness of the illumination light of backlight generation in real time, generate the brightness feedback signal according to detected brightness value; Perhaps, also can the serviceability temperature transducer detect the temperature of the illumination light that backlight produces in real time, generate temperature feedback signal earlier, and then, described temperature feedback signal is converted to described brightness feedback signal according to default temperature calibration curve.
Wherein, temperature calibration curve is the temperature of illumination light and the relation curve of brightness, and practice shows, has certain functional relation between the temperature of illumination light and the brightness, therefore, also can obtain the brightness feedback signal indirectly by the detection to temperature.And, owing to be easy to be subjected to the interference of external environment when brightness is detected, and it is less that temperature is detected the external environmental interference that is subjected to, and therefore, it is higher to the accuracy that brightness detects than adopting luminance sensor to adopt temperature sensor that temperature is detected.
Wherein, described default luminance threshold is that the user is according to the liquid crystal display needs and predefined desired value, promptly wish the brightness value that illumination light reached of backlight, should default luminance threshold for example can be kept at EEPROM (Electrically Erasable Programmable Read Only Memo) (Electrically Erasable ProgrammableRead-Only Memory in advance, be called for short: EEPROM), to avoid loss of data after the power down.
Particularly, owing to generally include ruddiness composition, green glow composition and blue light composition in the illumination light of backlight, therefore, the user can preset a plurality of threshold values at different color of light compositions, as: ruddiness luminance threshold, green glow luminance threshold and blue light luminance threshold.Correspondingly, can generate ruddiness brightness regulated signal, green glow brightness regulated signal and blue light brightness regulated signal respectively according to described brightness feedback signal and the difference of difference, described brightness feedback signal and the green glow luminance threshold of the ruddiness luminance threshold of presetting and the difference of described brightness feedback signal and blue light luminance threshold.
Wherein, (Pulse Width Modulation is called for short: PWM) be recently to adjust the modulation system that voltage is exported by the width or the duty that change pulse in pulse width modulation.Particularly, thus can carry out the corresponding generation ruddiness of pulse width modulation brightness control signal, green glow brightness control signal and blue light brightness control signal respectively to described ruddiness brightness regulated signal, green glow brightness regulated signal and blue light brightness regulated signal.
Particularly, can control the brightness of the ruddiness composition in the illumination light that described backlight produces by the described ruddiness brightness control signal that forms in the above-mentioned steps, control the brightness of the green glow composition in the illumination light that described backlight produces by described green glow brightness control signal, control the brightness of the blue light composition in the illumination light that described backlight produces by described blue light brightness control signal.By control, can make the saturation of final synthetic illumination light satisfy user's demand better, to obtain better display effect to shades of colour light composition.
The illumination light that the described method of present embodiment produces by real-time detection backlight generates the brightness feedback signal and has realized the negative feedback of backlight illumination light is controlled, thereby can realize dynamic compensation to the brightness saltus step that temperature drift produces, the illumination light that backlight is produced becomes stable, and visual effect is better.
Fig. 3 is the structural representation of backlight source control device embodiment one of the present invention; As shown in the figure, this device comprises: transducer 20, analog to digital converter 30, brightness regulator 40 and pulse width modulator 50, and its operation principle is as follows:
Transducer 20 detects the illumination light that backlights 10 produce in real time, and particularly, in the present embodiment, this transducer 20 is specially luminance sensor, is used for detecting in real time the brightness of the illumination light that backlight 10 produces; Analog to digital converter 30 is a feedback signal with the analog signal conversion that transducer 20 obtains when detecting illumination light, and particularly, in the present embodiment, this analog to digital converter 30 is converted to the brightness feedback signal with the luminance signal of the detected illumination light of described luminance sensor;
The described brightness regulated signal that 50 pairs of brightness regulators of pulse width modulator 40 generate carries out pulse width modulation, generates the brightness control signal of the brightness that is used to control described illumination light, sends to described backlight.
Particularly, as shown in Figure 4, be the internal structure schematic diagram of this pulse width modulator 50, this pulse width modulator 50 specifically can comprise: red modulation module 51, green glow modulation module 52 and blue light modulation module 53.
Wherein, red modulation module 51 is used for the ruddiness brightness regulated signal of the described brightness regulated signal of brightness regulator 40 generations is carried out pulse width modulation, generates the ruddiness brightness control signal that is used for controlling the brightness of described illumination light ruddiness composition; Green glow modulation module 52 is used for the green glow brightness regulated signal of the described brightness regulated signal of brightness regulator 40 generations is carried out pulse width modulation, generates the green glow brightness control signal that is used for controlling the brightness of described illumination light green glow composition; Blue light brightness regulated signal in the described brightness regulated signal that 53 pairs of brightness regulators of blue light modulation module 40 generate carries out pulse width modulation, generates the blue light brightness control signal that is used for controlling the brightness of described illumination light blue light composition.By control, can make the saturation of final synthetic illumination light satisfy user's demand better, to obtain better display effect to shades of colour light composition.
The illumination light that the described device of present embodiment produces by real-time detection backlight generates the brightness feedback signal and has realized the negative feedback of backlight illumination light is controlled, thereby can realize dynamic compensation to the brightness saltus step that temperature drift produces, the illumination light that backlight is produced becomes stable, and visual effect is better.
Fig. 5 is the structural representation of backlight source control device embodiment two of the present invention, and as shown in the figure, present embodiment further comprises temperature correction device 60 on the basis of said apparatus embodiment one, and its operation principle is as follows:
After this, by the difference generation brightness regulated signal of brightness regulator 40 according to temperature correction device 60 described brightness feedback signal that converts to and the luminance threshold of presetting; The described brightness regulated signal that 50 pairs of brightness regulators of pulse width modulator 40 generate carries out pulse width modulation, generates the brightness control signal of the brightness that is used to control described illumination light.About the detailed description of brightness regulator 40 and pulse width modulator 50 can repeat no more referring to said apparatus embodiment one herein.
The described device of present embodiment also has the technique effect of said apparatus embodiment one, in addition, owing to be easy to be subjected to the interference of external environment when brightness is detected, and it is less that temperature is detected the external environmental interference that is subjected to, therefore, it is higher to the accuracy that brightness detects than adopting luminance sensor to adopt temperature sensor that temperature is detected, thereby more helps stablizing the illumination light that backlight produces.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a backlight control method is characterized in that, comprising:
Detect the illumination light generation brightness feedback signal that backlight produces in real time;
According to the difference generation brightness regulated signal of described brightness feedback signal with the luminance threshold of presetting;
Described brightness regulated signal is carried out pulse width modulation generate brightness control signal;
Control the brightness of the illumination light of described backlight generation by described brightness control signal.
2. method according to claim 1 is characterized in that, the illumination light that described real-time detection backlight produces generates the brightness feedback signal and comprises: the brightness that detects the illumination light of backlight generation in real time generates the brightness feedback signal.
3. method according to claim 1 is characterized in that, the illumination light that described real-time detection backlight produces generates the brightness feedback signal and comprises:
The temperature that detects the illumination light of backlight generation in real time generates temperature feedback signal;
Temperature calibration curve according to default is converted to described brightness feedback signal with described temperature feedback signal.
4. method according to claim 1, it is characterized in that, generate brightness regulated signal according to the difference of described brightness feedback signal and default luminance threshold and comprise: the difference according to described brightness feedback signal and default ruddiness luminance threshold, green glow luminance threshold and blue light luminance threshold generates ruddiness brightness regulated signal, green glow brightness regulated signal and blue light brightness regulated signal respectively.
5. method according to claim 4, it is characterized in that, described brightness regulated signal is carried out pulse width modulation generation brightness control signal comprise: described ruddiness brightness regulated signal, green glow brightness regulated signal and blue light brightness regulated signal are carried out pulse width modulation respectively generate ruddiness brightness control signal, green glow brightness control signal and blue light brightness control signal.
6. method according to claim 5, it is characterized in that, the brightness of being controlled the illumination light that described backlight produces by described brightness control signal comprises: controlled the brightness of the ruddiness composition in the illumination light that described backlight produces by described ruddiness brightness control signal, control the brightness of the green glow composition in the illumination light that described backlight produces by described green glow brightness control signal, control the brightness of the blue light composition in the illumination light that described backlight produces by described blue light brightness control signal.
7. a backlight source control device is characterized in that, comprising:
Transducer is used for detecting in real time the illumination light that backlight produces;
Analog to digital converter, the analog signal conversion that is used for transducer is obtained when detecting illumination light is a feedback signal;
Brightness regulator, the difference that is used for described brightness feedback signal that converts to according to analog to digital converter and the luminance threshold of presetting generates brightness regulated signal;
Pulse width modulator is used for the described brightness regulated signal that brightness regulator generates is carried out pulse width modulation, generates the brightness control signal of the brightness that is used to control described illumination light.
8. device according to claim 7 is characterized in that:
Described transducer is a luminance sensor, is used for detecting in real time the brightness of the illumination light that backlight produces;
Described analog to digital converter is used for the luminance signal of the detected illumination light of described luminance sensor is converted to the brightness feedback signal.
9. device according to claim 7 is characterized in that, also comprises: the temperature correction device;
Described transducer is a temperature sensor, is used for detecting in real time the temperature of the illumination light that backlight produces;
Described analog to digital converter is used for the temperature analog signal of the detected illumination light of described temperature sensor is converted to temperature feedback signal;
Described temperature correction device is used for according to default temperature calibration curve described temperature feedback signal being converted to described brightness feedback signal.
10. device according to claim 7 is characterized in that, described pulse width modulator comprises:
The red modulation module, the ruddiness brightness regulated signal that is used for described brightness regulated signal that brightness regulator is generated carries out pulse width modulation, generates the ruddiness brightness control signal that is used for controlling the brightness of described illumination light ruddiness composition;
The green glow modulation module, the green glow brightness regulated signal that is used for described brightness regulated signal that brightness regulator is generated carries out pulse width modulation, generates the green glow brightness control signal that is used for controlling the brightness of described illumination light green glow composition;
The blue light modulation module, the blue light brightness regulated signal that is used for described brightness regulated signal that brightness regulator is generated carries out pulse width modulation, generates the blue light brightness control signal that is used for controlling the brightness of described illumination light blue light composition.
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| CN2010101104616A CN102149234A (en) | 2010-02-09 | 2010-02-09 | Backlight source control method and device |
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| CN2010101104616A CN102149234A (en) | 2010-02-09 | 2010-02-09 | Backlight source control method and device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102682718A (en) * | 2012-05-11 | 2012-09-19 | 深圳市华星光电技术有限公司 | Backlight module of liquid crystal display screen and control method thereof |
| CN103398727A (en) * | 2013-07-30 | 2013-11-20 | 广东威创视讯科技股份有限公司 | Temperature compensation method and system for sensor in display system |
| CN110010088A (en) * | 2019-05-20 | 2019-07-12 | 京东方科技集团股份有限公司 | Transparence display mould group and transparent display |
| CN110196529A (en) * | 2019-03-19 | 2019-09-03 | 深圳市中科创激光技术有限公司 | A kind of light-source control system and control method |
| CN113189831A (en) * | 2020-01-14 | 2021-07-30 | 青岛海信激光显示股份有限公司 | Laser projection apparatus and driving method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102682718A (en) * | 2012-05-11 | 2012-09-19 | 深圳市华星光电技术有限公司 | Backlight module of liquid crystal display screen and control method thereof |
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| CN110196529A (en) * | 2019-03-19 | 2019-09-03 | 深圳市中科创激光技术有限公司 | A kind of light-source control system and control method |
| CN110196529B (en) * | 2019-03-19 | 2021-04-30 | 深圳市中科创激光技术有限公司 | Light source control system and control method |
| CN110010088A (en) * | 2019-05-20 | 2019-07-12 | 京东方科技集团股份有限公司 | Transparence display mould group and transparent display |
| CN110010088B (en) * | 2019-05-20 | 2022-01-11 | 京东方科技集团股份有限公司 | Transparent display module and transparent display device |
| CN113189831A (en) * | 2020-01-14 | 2021-07-30 | 青岛海信激光显示股份有限公司 | Laser projection apparatus and driving method thereof |
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Application publication date: 20110810 |