CN102157133B - Backlight control device and backlight control method - Google Patents
Backlight control device and backlight control method Download PDFInfo
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- CN102157133B CN102157133B CN201010115769.XA CN201010115769A CN102157133B CN 102157133 B CN102157133 B CN 102157133B CN 201010115769 A CN201010115769 A CN 201010115769A CN 102157133 B CN102157133 B CN 102157133B
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Abstract
The invention discloses a backlight control device, which is used for controlling the luminance of backlight. The device comprises an image information memory and a detecting and auto-switching circuit, wherein the image information memory is used for memorizing image information; and the detecting and auto-switching circuit is used for detecting an updating frequency that the image information is updated, and setting a display mode which is used for adjusting the luminance of the backlight according to the updating frequency.
Description
Technical field
The present invention has about a kind of backlight control apparatus and method, and is particularly to a kind of backlight control apparatus and method of backlight of display panel.
Background technology
For example, in the luminous display device of passive type (liquid crystal indicator), providing backlight to be used as light emitting source is one technology the most well known.And at the display quality of display device because user's demand and in constantly promoting, the simple light source that provides is not only just provided backlight.Backlight brightness is also adjusted in response to the consumption of different display conditions and electric power, so that the usefulness of display device can effectively rise.
Context adaptive backlight control (Content Adaptive Back-light Control, CABC) technology is a kind of technology of utilizing the content of demonstration image to adjust the brightness of backlight.This context adaptive backlight control technology is based on display device showing under the pattern of tableaux or dynamic menu, carrys out the brightness of corresponding adjustment backlight.With so reach under the power consumption of full blast, make display device present best display effect.But, in known context adaptive backlight control technology, in the switching of backlight brightness, Chang Yinwei switching time incorrect, and make the shown picture of display device produce the phenomenon of flicker and reduce display quality.
Summary of the invention
The invention provides a kind of backlight control apparatus and method, going out the shown image of display panel in order to automatic decision is dynamic image or still image, and adjusts according to this brightness of backlight.
The present invention proposes a kind of backlight control apparatus, in order to control the brightness of backlight, comprises image information memory and detection and automatic switch-over circuit.Image information memory is in order to store images information.Detection and automatic switch-over circuit couple picture signal storer, the renewal frequency being updated in order to detected image information.Detection and automatic switch-over circuit and according to renewal frequency with set in order to adjust the display mode of backlight brightness.
In one embodiment of the invention, above-mentioned detection and automatic switch-over circuit comprise detection counter and mode switch.Detection counter is every the more new state of setting-up time cycle detection image information, and changes count results according to new state more.Mode switch couples detection counter, is animation mode or static schema in order to carry out setting display mode according to count results.
In one embodiment of the invention, above-mentioned detection counter detects when in setting-up time, image information is not updated, countdown result.If detection counter detects when image information has been updated in setting-up time, increase progressively count results.
In one embodiment of the invention, above-mentioned mode switch is in the time that count results is more than or equal to higher limit, and switching display mode is animation mode.Mode switch is in the time that count results is less than or equal to lower limit, and switching display mode is static schema.
The present invention also proposes a kind of method for controlling backlight thereof, in order to control the brightness of backlight, comprising: the renewal frequency of stored image information in detected image information-storing device.And, according to renewal frequency with set in order to adjust the display mode of backlight brightness.
Based on above-mentioned, the present invention is stored in the frequency being updated of the image information in image information memory by detection, judges that the shown image of display panel is for dynamically or still image, and setting display mode according to this.The display mode that recycling sets is adjusted the brightness of backlight, with the switching time of optimization backlight brightness.
For above-mentioned feature and advantage of the present invention can be become apparent, special embodiment below, and coordinate accompanying drawing to be described in detail below.
Brief description of the drawings
Fig. 1 illustrates the schematic diagram of the backlight control apparatus 100 of one embodiment of the invention.
Figure 1A illustrates the schematic diagram of the detection of the embodiment of the present invention and an embodiment of automatic switch-over circuit 120.
Fig. 2 A and 2B illustrate the detection of the embodiment of the present invention and the action flow chart of automatic switch-over circuit 120.
Fig. 3 illustrates the process flow diagram of the method for controlling backlight thereof of one embodiment of the invention.
[primary clustering symbol description]
100: backlight control apparatus
101: host side
102: backlight
103: display panel
110: output/incoming interface
120: detect and automatic switch-over circuit
121: detection counter
122: mode switch
130: control working storage
140: image information memory
150: image dissector
160: image processor
170: adjuster backlight
MODE: display mode
IM: image information
DATA: information
CNT: count results
S210～280: the action step of detection and automatic switch-over circuit 120
S310～S320: the step of method for controlling backlight thereof
Embodiment
Please refer to Fig. 1, Fig. 1 illustrates the schematic diagram of the backlight control apparatus 100 of one embodiment of the invention.Backlight control apparatus 100 is in order to control the brightness of backlight 102.Backlight control apparatus 100 comprises output/incoming interface 110, detection and automatic switch-over circuit 120, controls working storage 130, image information memory 140, image dissector 150, image processor 160 and adjuster backlight 170.Wherein, output/incoming interface 110 receives and comes from the information DATA that host side (host) 101 transmits, and this information DATA is sent to respectively and controls working storage 130 and detection and automatic switch-over circuit 120.At this, the information DATA that host side 101 transmits generally includes to be provided the image information IM of display panel and controls the control command that backlight control apparatus 100 moves.Image information IM is sent to image information memory 140 by detection and automatic switch-over circuit 120 and stores, and control command is sent to control working storage 130 and keeps in.
Because image information IM deposits image information memory 140 in by detection and automatic switch-over circuit 120, therefore, detection and automatic switch-over circuit 120 can be learnt the more new state of the image information IM in image information memory 140, and further obtain the renewal frequency that image information IM is updated.In simple terms, detection and automatic switch-over circuit 120 are within cycle regular hour, the number of times (the new image information IM that namely adds up within the time cycle is reached the number of times of detection and automatic switch-over circuit 120) that image information IM in recording image information storer 140 is upgraded, just can obtain the renewal frequency that image information IM is updated.
Note that in the time that display panel 103 carries out the demonstration of tableaux at this, what image information IM did not need to continue is updated, but time interval that need to be longer just can be updated.Contrary, in the time that display panel 103 carries out the demonstration of dynamic menu, because display panel 103 is to show continuously multiple different images, therefore, the renewal that image information IM can be continued.In other words, when detecting and automatic switch-over circuit 120 detects image information IM in recording image information storer 140 is updated frequency when higher, can judge that display panel 103, in the demonstration of carrying out dynamic menu, goes forward side by side taking setting display mode MODE as animation mode.Contrary, when detecting and automatic switch-over circuit 120 detects image information IM in recording image information storer 140 is updated frequency when lower, can judge that display panel 103, in the demonstration of carrying out tableaux, goes forward side by side taking setting display mode MODE as static schema.
In addition, the above-mentioned higher or lower judgement about renewal frequency, can realize by setting a fiducial value.Be greater than this fiducial value once renewal frequency, renewal frequency is judged as higher.Relative, when renewal frequency is not more than this fiducial value, renewal frequency is judged as lower.
120 of detection and automatic switch-over circuits are sent to the display mode MODE setting to control working storage 130, and are sent in adjuster 170 backlight by controlling working storage 130.The received display mode MODE of 170 foundations of adjuster backlight adjusts the brightness of backlight 102.As a rule, in the time that the received display mode MODE of adjuster 170 backlight is animation mode, can corresponding turn down the brightness of backlight 102.And in the time that the received display mode MODE of adjuster 170 backlight is static schema, can corresponding heighten the brightness of backlight 102
It is worth mentioning that, the display mode MODE that detection and automatic switch-over circuit 120 set also can directly be sent to adjuster 170 backlight and make the corresponding brightness of adjusting backlight 102 of adjuster 170 backlight.Why mention in the present embodiment display mode MODE and be by the reason of controlling working storage 130 and being sent to adjuster 170 backlight, user or deviser also can assign control command and adjust by host side 101 brightness of backlight 102.Therefore, control working storage 130 and can integrate that (one is display mode MODE about the brightness adjustment order of backlight 102 from two aspects, the control command that another is assigned for host side 101), adjust 102 brightness of best backlight to transmit suitable order to adjuster 170 backlight.
For instance, receive from detecting and when the order of the backlight brightness adjustment of automatic switch-over circuit 120 and host side 101, the brightness of the backlight 102 that can set according to host side 101 is that benchmark is adjusted when controlling working storage 130 simultaneously.For instance, in the time that display mode MODE is static schema, taking user set backlight 102 brightness as backlight 102 brightness.And in the time that display mode MODE is animation mode, the brightness of the backlight 102 of setting with user is multiplied by one and is less than 1 proportional numers (as 80%), adjust backlight 102 brightness.
Please refer in addition Figure 1A, Figure 1A illustrates the detection of the embodiment of the present invention and an embodiment schematic diagram of automatic switch-over circuit 120.In the present embodiment, detection and automatic switch-over circuit 120 comprise detection counter 121 and mode switch 122.Detection counter 121 is in order to the more new state every a setting-up time cycle detection image information IM, and changes and produce count results CNT according to the more new state detecting.Mode switch 122 couples detection counter 121 and carrys out setting display mode MODE according to count results CNT is animation mode or static schema.
For more clearly demonstrating the detection mode of the renewal frequency that the image information IM of the embodiment of the present invention is updated, and the establishing method of display mode, below reintroduce an embodiment and be illustrated, to making the present invention according to conventionally knowing that the knowledgeable can more understand feature of the present invention.
Below please refer to Fig. 2 A and 2B, Fig. 2 A and 2B illustrate the detection of the embodiment of the present invention and the action flow chart of automatic switch-over circuit 120.Please refer to Fig. 2 A, first, detection and automatic switch-over circuit 120 detect in a setting-up time, the more new state (step S210) of the image information in image information memory 140.This is the detection of new state more, can detect in setting-up time, and whether image information memory 140 produces write activity, or whether further detect the image information in image information memory 140 in setting-up time has change to carry out.And need to pay special attention to, in step S210, do not record the number of times that image information is upgraded in setting-up time, but only recording image information has or not and is updated.
Detect and automatic switch-over circuit 120 and judging in setting-up time, image information has or not and is updated (step S220), if detection and automatic switch-over circuit 120 are judged image information in setting-up time and are not updated, countdown result (step S230), and again perform step S210.On the other hand, be updated if detection and automatic switch-over circuit 120 are judged image information in setting-up time, detection and 120 of automatic switch-over circuits then judge whether count results has been more than or equal to the higher limit (step S240) previously having set.At this moment, if detect and automatic switch-over circuit 120 judge when count results is less than higher limit, increase progressively count results.Between execution step S220 and step S230, the lasting detection count results of detection and automatic switch-over circuit 120 has or not and is less than or equal to pre-set lower limit (step S270).Be less than or equal to pre-set lower limit once detect count results, it is static schema (step S280) that 120 of detection and automatic switch-over circuits switch display modes.
Then please refer to Fig. 2 B, the step S240 wherein illustrating in Fig. 2 B and S250 are identical with the step S240 illustrating in Fig. 2 A and S250, are for clearer link Fig. 2 A, 2B having carried out illustrating of repetition, first having proposed explanation at this.Be while being greater than the higher limit previously having set when step S240 judges count results, it is animation mode (step S260) that detection and automatic switch-over circuit 120 switch display mode.
Subsidiary one carries, when detecting and automatic switch-over circuit 120 detects count results and is more than or equal to higher limit and display mode and completes and switch to after animation mode, the action that count value stops increasing progressively.Relative, when detecting and automatic switch-over circuit 120 detects count results and is less than or equal to lower limit and display mode and completes and switch to after static schema, the action that count value stops successively decreasing.Can effectively avoid thus the phenomenon of count value generation overflow or underflow (overflow or underflow).
Below referring to Fig. 1, Fig. 2 A, 2B.The motion flow of the automatic switch-over circuit 120 that Fig. 2 A, 2B illustrate, can also avoid the excessive display mode MODE that switches at once of renewal frequency of the image information IM of automatic switch-over circuit 120 in detecting image information memory 140.Thus, the automatic switch-over circuit 120 of the embodiment of the present invention just can effectively be avoided because of host side 101 under the condition of the limited frequency range application due to image information memory 140, be not to write uniformly image information memory 140, and produce the switching action of continuous display mode MODE.
Then please refer to Fig. 3, Fig. 3 illustrates the process flow diagram of the method for controlling backlight thereof of one embodiment of the invention.Its step comprises: first, and the renewal frequency of stored image information (step S310) in detected image information-storing device.Then, according to renewal frequency with set in order to adjust the display mode (step S320) of backlight brightness.And about the detection of renewal frequency and the switching of display mode action, all in the embodiment of aforesaid backlight control apparatus 100, be described later in detail, below do not repeat for this reason.
In sum, the present invention utilize image information in detected image information-storing device be updated frequency judge display panel shown be dynamic image or still image.And corresponding setting display mode is dynamically to adjust the brightness of backlight.Effectively, in saving backlight power consumption, take into account the quality that image shows.
Although the present invention discloses as above with embodiment; but it is not in order to limit the present invention; under any, in technical field, have and conventionally know the knowledgeable; without departing from the spirit and scope of the present invention; change and retouching when doing some, therefore protection scope of the present invention should be with appended being as the criterion that claim was defined.
Claims (4)
1. a backlight control apparatus, in order to control the brightness of backlight, comprising:
Image information memory, in order to store images information; And
Detect and automatic switch-over circuit, couple this image information memory, the renewal frequency being updated in order to detect this image information, this detection and automatic switch-over circuit also according to this renewal frequency with set in order to adjust the display mode of this backlight brightness, this detection and automatic switch-over circuit comprise:
Detection counter, every the more new state of this image information of setting-up time cycle detection, and according to this more new state change count results, wherein this detection counter detects when in this setting-up time, this image information is not updated, this count results of successively decreasing, if this detection counter detects when this image information has been updated in this setting-up time, increase progressively this count results; And
Mode switch, couples this detection counter, and setting this display mode according to this count results is animation mode or static schema.
2. backlight control apparatus as claimed in claim 1, wherein this mode switch is in the time that this count results is more than or equal to a higher limit, switching this display mode is this animation mode, this mode switch is in the time that this count results is less than or equal to a lower limit, and switching this display mode is this static schema.
3. a method for controlling backlight thereof, in order to control the brightness of backlight, comprising:
The renewal frequency of stored image information in detected image information-storing device, wherein, detected the more new state of this image information by detection counter every the setting-up time cycle, and according to this more new state change count results, in the time that this detection counter detects that this image information is not updated in this setting-up time, this count results of successively decreasing, if this detection counter detects when this image information has been updated in this setting-up time, increases progressively this count results; And
According to this renewal frequency, to set in order to adjust the display mode of this backlight brightness, wherein, setting this display mode according to this count results is animation mode or static schema.
4. method for controlling backlight thereof as claimed in claim 3, wherein setting this display mode according to this count results is that the step of animation mode or static schema comprises:
In the time that this count results is more than or equal to a higher limit, switching this display mode is this animation mode; And
In the time that this count results is less than or equal to a lower limit, switching this display mode is this static schema.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010115769.XA CN102157133B (en) | 2010-02-12 | 2010-02-12 | Backlight control device and backlight control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010115769.XA CN102157133B (en) | 2010-02-12 | 2010-02-12 | Backlight control device and backlight control method |
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| CN102157133A CN102157133A (en) | 2011-08-17 |
| CN102157133B true CN102157133B (en) | 2014-06-11 |
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| CN201010115769.XA Expired - Fee Related CN102157133B (en) | 2010-02-12 | 2010-02-12 | Backlight control device and backlight control method |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050108B (en) * | 2012-12-17 | 2015-12-02 | 华为终端有限公司 | A kind of screen backlight dynamic adjustment method and user terminal |
| CN103956145B (en) * | 2014-03-27 | 2015-07-08 | 努比亚技术有限公司 | Terminal display mode determining method and apparatus |
| US20160098962A1 (en) * | 2014-10-07 | 2016-04-07 | Innolux Corporation | Display device and driving method thereof |
| CN108806620A (en) * | 2018-07-17 | 2018-11-13 | 苏州佳世达电通有限公司 | Luminance compensation method and its system |
| CN110060628A (en) * | 2019-04-17 | 2019-07-26 | 上海天马微电子有限公司 | A kind of display driving method, device, driving chip and display device |
| CN110444170A (en) * | 2019-08-21 | 2019-11-12 | 四川长虹电器股份有限公司 | Reduce the control system and method for LCD TV backlight power |
| CN111429850A (en) | 2020-04-08 | 2020-07-17 | 深圳市华星光电半导体显示技术有限公司 | Display panel and display method thereof |
| CN115116411B (en) * | 2022-05-17 | 2023-08-04 | 广西世纪创新显示电子有限公司 | Method for eliminating terminal screen flicker |
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| CN1400576A (en) * | 2001-07-27 | 2003-03-05 | 夏普公司 | Display device |
| CN101131505A (en) * | 2006-08-21 | 2008-02-27 | Lg.菲利浦Lcd株式会社 | Liquid crystal display and driving method thereof |
| CN101540135A (en) * | 2007-11-26 | 2009-09-23 | 统宝光电股份有限公司 | Display system and method for reducing power consumption of same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006098765A (en) * | 2004-09-29 | 2006-04-13 | Seiko Epson Corp | Image display device, image display system, image output equipment and method for setting refresh rate of image display device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1400576A (en) * | 2001-07-27 | 2003-03-05 | 夏普公司 | Display device |
| CN101131505A (en) * | 2006-08-21 | 2008-02-27 | Lg.菲利浦Lcd株式会社 | Liquid crystal display and driving method thereof |
| CN101540135A (en) * | 2007-11-26 | 2009-09-23 | 统宝光电股份有限公司 | Display system and method for reducing power consumption of same |
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Granted publication date: 20140611 Termination date: 20160212 |