CN100461841C - Device for automatically adjusting television receiver video contrast and method thereof - Google Patents
Device for automatically adjusting television receiver video contrast and method thereof Download PDFInfo
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- CN100461841C CN100461841C CNB2006100472281A CN200610047228A CN100461841C CN 100461841 C CN100461841 C CN 100461841C CN B2006100472281 A CNB2006100472281 A CN B2006100472281A CN 200610047228 A CN200610047228 A CN 200610047228A CN 100461841 C CN100461841 C CN 100461841C
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- crystal display
- television receiver
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Abstract
The present invention discloses a device and the method for automatically adjusting the image contrast of a television receiver. The device is mainly a device for adjusting the image contrast which is arranged on the television receiver equipped with a LCD display component, and the device main comprises a signal control part and an image processing part. The contrast adjusting method is that a control command which can change the brightness is input and then the image brightness on the LCD display component is changed according to the command. Whether the brightness changing quantity exceeds the specified reference value is judged; if the brightness changing quantity does not exceed the specified reference value, the image contrast of the LCD display component is kept; whether the brightness changing quantity exceeds the specified reference value is judged, and a definite rate change to the image contrast of the LCD display component is performed, thereby, the image quality is improved, at the same time, the contrast changing value which is uneasy to be identified by the user can be automatically changed, and a convenience is provided to the user.
Description
Technical field
The present invention relates to change the device of picture contrast, especially the indication according to the user changes the picture brightness that outputs on the liquid crystal display cells LCD, adjusts the devices and methods therefor of television receiver picture contrast more automatically according to the change amount of brightness.
Background technology
The liquid crystal display cells of exploitation has advantages such as small-sized, lightweight and consumption is low in order to substitute leonard's tube (CRT) recently, so be not only hand-held computer and desktop computer, business automation equipment and audio/video devices etc. can both use.
Because this liquid crystal display cells itself is not luminous,, or at the back side of liquid crystal display distribution board extra light source is installed, promptly backlight assembly is installed and come display message so the exterior light that its can will pass the liquid crystal display distribution board reflects display message.Said backlight assembly comprises the luminescence unit of emitting light, and the light that luminescence unit is launched guides to the light guide plate of liquid crystal display distribution board, and the light that light-guide plate guides is come is spread with optically focused, with the optical sheet of the efficient that improves light.Employed light source is halogen cathode fluorescent lamp or cold-cathode tube in the above-mentioned luminescence unit.Wherein cold-cathode tube is to utilize cold cathode to emit the light source of phenomenon, is easier to realize that heating is low, briliancy is high, the life-span is long and color is comprehensive.Inverter (also crying the backlight control loop) provides high-tension electric current to guarantee the operation of backlight assembly, and it also receives the brightness that control signal is adjusted above-mentioned luminescence unit from microcontroller.Above-mentioned microcontroller uses simulation deepening method to change high-tension electric current, thereby regulates brightness backlight.At this moment, if when briliancy is in low-down condition, because the variable range of briliancy is less, thus will adopt fixed fire deepening method to change the ON/OFF task of high voltage inversion frequency, thus brightness backlight regulated.For example, reducing the user under the situation of briliancy, when lower briliancy moves, lowering briliancy thereby use simulation deepening method to reduce electric current from higher briliancy, when being reduced to briliancy can't reduce the time, thereby the task of opening that just adopts fixed fire deepening method to change inversion frequency reduces briliancy again.Here, the variable briliancy interval of electric current is called the analog variable interval, and the interval that relies on the task of opening of inversion frequency to change briliancy is called the pulse amplitude interval.
Thereby when using this fixed fire deepening method to change the opening/closing task to regulate the brightness of above-mentioned luminescence unit, because wavy noise can take place, so proposed the mode of current change in order to improve this problem, promptly simulate the deepening mode.Its example is exactly the technology that proposes in korean patent application 2001-0051722 number, it can realize deepening loop that fixed fire deepening mode and linear deepening mode are combined and use, thereby when interfering the phenomenon of luminance ratio and frequency it is cut off.But under the situation of the deepening mode of stating in the use, the spectator when changing contrast (briliancy of image) since the variable quantity that is changed very little, with the naked eye can't identify easily, so can cause that the spectator's is discontented.
Summary of the invention
In order to solve the problem that above-mentioned spectator with the naked eye can't identify the contrast variable quantity easily, purpose of the present invention just provides and a kind ofly changes brightness to the picture of screen output at television receiver according to user's indication, adjusts the apparatus and method of television receiver picture contrast more automatically according to the variable of brightness.
Another object of the present invention provides and a kind ofly makes that brightness has reached under the situation more than the fiducial value in television receiver, with the change amount of brightness pro rata, change contrast automatically by certain ratio, thereby adjust the apparatus and method of television receiver picture contrast automatically.
In order to reach above-mentioned purpose, present invention resides in the liquid crystal display cells that the liquid crystal display distribution board of being used by display image installed in the television receiver and backlight assembly are formed, backlight assembly can be launched bright dipping provides brightness for manifesting the picture that outputs on the liquid crystal display distribution board, and the contrast control device also is installed; This device comprises that the control command that changes brightness according to the indication imported just can change the brightness of the picture of exporting on the above-mentioned liquid crystal display distribution board, and according to the control part of the contrast of the image of exporting on the above-mentioned liquid crystal display distribution board of the variable quantity may command of brightness; The brightness control signal of importing according to above-mentioned control part can increase or reduce to offer the inverter of the magnitude of current of above-mentioned backlight assembly; And the image processing part that increases or reduce to be presented at the gain of the picture signal on the liquid crystal display distribution board according to the contrast control signal that above-mentioned control part is imported.
In the present invention, in the television of the liquid crystal cell with displayed image, regulate the method that is presented at above-mentioned liquid crystal cell epigraph contrast and comprise following four-stage: the phase I is that the input indication changes the control command of brightness and orders the brightness that changes the picture of being exported on the liquid crystal display cells according to this; Second stage is to judge whether the brightness changing quantity in the phase I has surpassed specified reference value; Phase III is according to judged result, if brightness changing quantity does not reach specified reference value, maintenance outputs to the contrast of the image of liquid crystal display cells so; Surpass specified reference value if judged result is a brightness changing quantity, so just the contrast of the image that outputs to liquid crystal display cells has been made the change of certain ratio.
The present invention compared with prior art beneficial effect is as follows:
It is simple in structure, easy to operate that the present invention designs.Main in having the television receiver of liquid crystal display cells, having set up to the brightness of picture and the contrast automatic regulating equipment of image; To change under the situation of brightness according to certain ratio in user's indication, thereby will with the change amount of brightness pro rata, change contrast automatically according to certain ratio and improve image quality, simultaneously can also more automatically change the contrast variable quantity that the user with the naked eye can't identify easily, thereby facilitate for the user.
Description of drawings
Fig. 1 is a block diagram of adjusting the device of television receiver video contrast automatically;
Fig. 2 is a flow chart of adjusting the method for television receiver video contrast automatically;
Fig. 3 is a flow chart of adjusting the method for television receiver video contrast automatically.
Embodiment
With reference to accompanying drawing embodiments of the invention are described in detail:
See Fig. 1, adjust the contrast device automatically and comprise: the user imports the keyboard input part 110 of relevant brightness regulation order; The liquid crystal display cells 120 of display image; The user controls the brightness of the picture on the connected liquid crystal display cells 120 and the control part 130 that picture contrast changes by the order of keyboard input part 110 inputs; The brightness control signal of importing according to the control part 130 and inverter 140 of a certain amount of electric current is provided to liquid crystal display cells 120; The contrast control signal of being imported according to control part 130 can increase or reduce to be presented at the image processing part 150 of the gain of the picture signal on the liquid crystal display cells 120; And with the defeated distribution board drive division 160 that is shown on the liquid crystal display cells 120 of the picture signal of image processing part 150 inputs.
The user can import about the adjusting command to the various functions of television receiver such as brightness, contrast (briliancy of image) and volume adjusting by keyboard input part 110, and it is by constituting attached to a plurality of push type buttons on the television receiver.The user pushes these keyboards at every turn all certain keyboard signal can take place, and these signals are sent to control part 130 as the control signal of controlling the television receiver function.
Liquid crystal display cells 120 is by liquid crystal display distribution board 121 and send light and constitute for the image on the liquid crystal display distribution board 121 provides the backlight assembly 122 of brightness.Voltage and electric current that liquid crystal display distribution board 121 is approved by inverter 140 drive, and show the picture signal that transmits from distribution board drive division 160, the brightness of output picture changes along with the power of the light that backlight assembly 122 irradiated, and the contrast of output image changes along with the gain of the picture signal of image processing part 150 outputs.Here, big if the luminous intensity that backlight assembly 122 irradiates becomes, brightness also improves so, if the light intensity that irradiates of backlight assembly 122 diminishes on the contrary, brightness also reduces so.In addition, if the gain of the picture signal that image processing part 150 is exported increases, contrast just increases so, and if the gain of the picture signal of image processing part 150 outputs on the contrary reduces, contrast also diminishes so.
After the user increased the order of brightness by keyboard input part 110 input, control part 130 will be to the brightness control signal of inverter 140 output indications increasing brightness, be that brightness increases signal.Inverter 140 increases the magnitude of current that the signal increase offers backlight assembly 122 according to this brightness then, thereby increases the light intensity that backlight assembly 122 sends, the final brightness that realizes increasing picture.
And when the user reduced the order of brightness by keyboard input part 110 input, control part 130 will be to the brightness control signal of inverter 140 output indications reducing brightness, be that brightness reduces signal.Inverter 140 reduces signal according to this brightness and reduces and to offer the magnitude of current of backlight assembly 122 then, thereby weakens the light intensity that backlight assembly 122 sends, the final brightness that realizes reducing picture.
Increase like this or when reducing brightness, if the change amount of brightness has surpassed the specified standard value, so control part 130 will to image processing part 150 output indication reduce contrast contrast control signal, be that contrast reduces signal or contrast increases signal.Image processing part 150 reduces signal or contrast according to this contrast and increases signal and will reduce the amount of gain that will be shown to the picture signal on the liquid crystal display distribution board 121 or increase to the value of defined then.
If yet the change quantity not sufficient specified standard value of brightness, control part 130 just can not regulated the contrast of image automatically so, but makes it keep current contrast.
Made the indication that increases or reduce contrast if the user presses the key of keyboard input part 110, control part 130 will increase or reduce the control of contrast to image processing part 150 so.Next the indication of being made according to control part 130 by image processing part 150 increases or reduces contrast, and the contrasting signal that increases or reduce is exported to distribution board drive division 160.
Distribution board drive division 160 has picture signal with image processing part 150 output and is shown to function on the liquid crystal display distribution board 121, it carries out opening/closing conversion or to the brightness corresponding driving signal of liquid crystal display distribution board 121 outputs with view data, thus make the view data measured in the image processing part 150 or payment and/or gain regulated after view data be presented on the liquid crystal display distribution board 121.
Referring to the contrast Automatic adjustment method in Fig. 2 television receiver.It has shown and has increased the process that adds contrast along with the increase of brightness: at first under image is presented at state on the liquid crystal display distribution board 121, increase order S210 if the user has imported brightness, so control part 130 just to the brightness control signal of inverter 140 output indications increase brightness, be brightness increase signal S211.Increasing in the signal process in input brightness, the brightness value that the user determines oneself to want to change, is the brightness recruitment, increases the order of brightness then according to the brightness recruitment input indication that is determined.In the brightness control signal output procedure, control part 130 degree output brightness control signal as indicated is to realize the increase of brightness.
Behind the control part 130 output brightness control signals, inverter 140 just offers the magnitude of current of backlight assembly 122 according to the degree increase of control part 130 indications, thereby increases the degree S212 that brightness reaches user's indication.At this moment, control part 130 judges that the own brightness recruitment that is changed is whether more than standard value, whether the variable recruitment of for example judging brightness has surpassed 3% of specified standard value, if the result who judges is not enough specified standard value, control part 130 just keeps the gain-adjusted value of image processing part 150 so, thereby keeps current contrast S214.
And if the bright variable recruitment for brightness of the result of deterministic process S213 is bigger than specified standard value, control part 130 just press the signal that certain ratio increases contrast to image processing part 150 output so, for example indication increase by 1% degree contrast control signal, be contrast increase signal.To this, image processing part 150 will be presented at the gain-adjusted value of the picture signal on the liquid crystal display distribution board 121 according to the indication increase that contrast increases signal, thereby be presented at the contrast S216 of the image on the liquid crystal display distribution board 121 according to certain ratio increase.
See Fig. 3, it has shown the process that contrast reduces along with reducing of brightness.At first under image is presented at state on the liquid crystal display distribution board 121, if user's input brightness reduces order S220, control part 130 is just indicated brightness control signal that brightness reduce, is that brightness reduces signal S221 to inverter 140 outputs.Reducing among the command procedure S220 in input brightness, the amount of brightness that the user determines oneself to want to change, is the brightness decrease, and changes the order of brightness according to the brightness decrease input indication of decision.
In the output procedure S221 of brightness control signal, control part 130 is in order to reduce brightness, according to user's indication output brightness control signal.Like this, along with the brightness control signal of control part 130 outputs, inverter 140 will offer the magnitude of current of backlight assembly 122 according to the indication minimizing of control part 130, indicates the brightness of degree to reduce S222 thereby reach the user.
At this moment, control part 130 judges whether the own brightness reduction that is changed has surpassed the specified standard value, whether the variable reduction of for example judging brightness has surpassed 3% of specified standard value, if the result who judges is not enough specified standard value, control part 130 just keeps the gain-adjusted value of image processing part 150 so, thereby keeps current contrast S224.
And if that the judged result of deterministic process S223 is the variable reduction of brightness is bigger than specified standard value, control part 130 just press the signal that certain ratio increases contrast to image processing part 150 output so, for example the contrast control signal of indication minimizing 1% degree, be that contrast reduces signal.To this, image processing part 150 reduces and will be presented at the gain of the picture signal on the liquid crystal display distribution board 121 according to the indication that contrast reduces signal, thereby reduces to be presented at the contrast S216 of the image on the liquid crystal display distribution board 121 according to certain ratio.
The present invention has carried out specific description to effective embodiment, but above-mentioned example does not limit the scope of the invention only for explanation.In addition, the ordinary skill of technical field of the present invention can realize multiple embodiment in the scope of technology item of the present invention.
Claims (10)
1. device of automatically adjusting the television receiver video contrast, it is included in and is equipped with the liquid crystal display cells of being made up of liquid crystal display distribution board (121) and backlight assembly (122) (120) on the television receiver, its liquid crystal display distribution board can display image, backlight assembly (122) manifests to the picture on the above-mentioned liquid crystal display distribution board brightness is provided, it is characterized in that: also be furnished with on this television receiver being presented at the self-regulating device of picture contrast on the liquid crystal display distribution board (121), it comprises that the control command that changes brightness according to input can change the picture brightness of exporting on the above-mentioned liquid crystal display distribution board, and controls the control part (130) of the picture contrast that above-mentioned liquid crystal display distribution board (121) exported according to the variable quantity of brightness; Can increase or reduce to offer the inverter of the magnitude of current of above-mentioned backlight assembly according to the brightness control signal of above-mentioned control part input; And the image processing part that can increase or reduce the acquisition of the picture signal of liquid crystal display on distribution board (121) according to the contrast control signal that described control part (130) is imported.
2. the device of automatic adjustment television receiver video contrast according to claim 1, it is characterized in that: when above-mentioned control part (130) input increases the control command of brightness, the brightness that above-mentioned liquid crystal display distribution board (121) is gone up the picture of output also increases thereupon, when the variable recruitment of brightness had surpassed the specified standard value, the picture contrast that the image processing part (150) that may command is connected with control part (130) makes liquid crystal display distribution board (121) go up output also increased according to certain ratio.
3. the device of automatic adjustment television receiver video contrast according to claim 2, it is characterized in that: above-mentioned image processing part (150) receive the control part input contrast control signal, be the contrast plus signal, will increase the gain of the picture signal that will show on the above-mentioned liquid crystal display distribution board (121).
4. according to the device of claim 1 or 2 or 3 described automatic adjustment television receiver video contrasts, it is characterized in that: when above-mentioned control part (130) input reduces the control command of brightness, the brightness of the picture of exporting on the above-mentioned liquid crystal display distribution board just reduces thereupon, when the variable decrease of brightness has surpassed the specified standard value, just control above-mentioned image processing part (150) contrast of the image of the last output of liquid crystal display distribution board (121) is also reduced according to certain ratio.
5. the device of automatic adjustment television receiver video contrast according to claim 4, it is characterized in that: above-mentioned image processing part (150) receive control part (130) input contrast control signal, be that contrast reduces signal, will reduce the gain of the picture signal that will show on the above-mentioned liquid crystal display distribution board (121).
6. realize adjusting automatically the method for television receiver video contrast, it is characterized in that: in the television receiver of the liquid crystal display cells that is equipped with display image to use (120), the contrast Automatic adjustment method of the image on the above-mentioned liquid crystal display cells was comprised with the next stage:
Phase I is that input changes the control command of brightness and orders the brightness that changes the picture of being exported on liquid crystal display cells (120) according to this;
Second stage is to judge whether the brightness changing quantity in the phase I has surpassed specified reference value;
Phase III is according to judged result, when brightness changing quantity less than specified reference value, will keep outputing to the contrast of the image of liquid crystal display cells (120);
The quadravalence section be when judged result be that brightness changing quantity has surpassed specified reference value, will make the change of certain ratio to the contrast of the image that outputs to liquid crystal display cells.
7. the method for automatic adjustment television receiver video contrast according to claim 6 is characterized in that: in the above-mentioned phase I, the control command when input increase brightness will increase the brightness of picture.
8. the method for automatic adjustment television receiver video contrast according to claim 7, it is characterized in that: in above-mentioned quadravalence section, when the variable recruitment of brightness has surpassed the specified standard value, will increase the contrast of image according to certain ratio so.
9. according to any one automatic method of adjusting the television receiver video contrast of claim 6 to 8, it is characterized in that: in the above-mentioned phase I, input reduces the control command of brightness, can reduce the brightness of picture.
10. the method for automatic adjustment television receiver video contrast according to claim 9, it is characterized in that: in above-mentioned quadravalence section, when the variable decrease of brightness has surpassed the specified standard value, will reduce the contrast of image according to certain ratio so.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100472281A CN100461841C (en) | 2006-07-19 | 2006-07-19 | Device for automatically adjusting television receiver video contrast and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100472281A CN100461841C (en) | 2006-07-19 | 2006-07-19 | Device for automatically adjusting television receiver video contrast and method thereof |
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| Publication Number | Publication Date |
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| CN101110926A CN101110926A (en) | 2008-01-23 |
| CN100461841C true CN100461841C (en) | 2009-02-11 |
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| CNB2006100472281A Expired - Fee Related CN100461841C (en) | 2006-07-19 | 2006-07-19 | Device for automatically adjusting television receiver video contrast and method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102663985A (en) * | 2012-04-20 | 2012-09-12 | 深圳创维－Rgb电子有限公司 | Contrast and brightness linkage adjustment method and device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103310740B (en) * | 2013-04-26 | 2015-11-18 | 明基电通有限公司 | The image treatment method of display device and display device thereof |
| CN103424842B (en) * | 2013-08-08 | 2018-02-23 | 深圳雅图数字视频技术有限公司 | A kind of light adjusting device and the contrast ratio of projector adjusting means with the device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05344446A (en) * | 1992-06-09 | 1993-12-24 | Nippon Avionics Co Ltd | Automatic contrast adjustment circuit |
| JP2001134226A (en) * | 1999-11-08 | 2001-05-18 | Matsushita Electric Ind Co Ltd | Picture display device and picture display method |
| CN1450801A (en) * | 2002-04-05 | 2003-10-22 | 株式会社日立制作所 | Contrast adjusting circuit and video display apparatus using same |
-
2006
- 2006-07-19 CN CNB2006100472281A patent/CN100461841C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05344446A (en) * | 1992-06-09 | 1993-12-24 | Nippon Avionics Co Ltd | Automatic contrast adjustment circuit |
| JP2001134226A (en) * | 1999-11-08 | 2001-05-18 | Matsushita Electric Ind Co Ltd | Picture display device and picture display method |
| CN1450801A (en) * | 2002-04-05 | 2003-10-22 | 株式会社日立制作所 | Contrast adjusting circuit and video display apparatus using same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102663985A (en) * | 2012-04-20 | 2012-09-12 | 深圳创维－Rgb电子有限公司 | Contrast and brightness linkage adjustment method and device |
| CN102663985B (en) * | 2012-04-20 | 2014-10-01 | 深圳创维－Rgb电子有限公司 | Contrast and brightness linkage adjustment method and device |
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| Publication number | Publication date |
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| CN101110926A (en) | 2008-01-23 |
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