CN100417211C - Contrast controller of image displaying device - Google Patents
Contrast controller of image displaying device Download PDFInfo
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- CN100417211C CN100417211C CNB2004100208133A CN200410020813A CN100417211C CN 100417211 C CN100417211 C CN 100417211C CN B2004100208133 A CNB2004100208133 A CN B2004100208133A CN 200410020813 A CN200410020813 A CN 200410020813A CN 100417211 C CN100417211 C CN 100417211C
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Abstract
The present invention relates to a contrast controller of an image displaying appliance, which detects an average level in an analog image signal and adjusts an image signal amplification coefficient of a signal source according to the detected level. The contrast controller of an image displaying appliance is composed of an amplification coefficient controlling part, an analog-to-digital converter ADC, a format converter and an image processing part, wherein the amplification coefficient controlling part controls the image signal amplification coefficient of the signal source according to the average brightness voltage level of the input analog image signal; the analog-to-digital converter ADC converts the analog signal received from the amplification coefficient controlling part into a digital image signal; the format converter converts the digital signal of the ADC into a format capable of supporting the relevant image displaying appliance; the image processing part receives an output signal of the format converter and processes the output signal into a signal capable of being displayed in a relevant display. The contrast controller of an image displaying appliance can detect voltage similar to the voltage of an automatic brightness limiter ABL of a CRT before the image signal of the ADC is input and can also adjust the contrast of the image signal of the signal source by the detected voltage according to classification grades, and therefore, the contrast of a middle-frequency band or a low-frequency band is enhanced.
Description
Technical field
The invention relates to image display, particularly about in can improving in the image display that uses flat display board/invention of the contrast control device of the image display of low-luminosity picture signal contrast.
Background technology
Usually, the use of display device representationally generally is applied in the TV as it.This TV is as in the broadcast singal that TV station is broadcast, select the broadcast singal TV programme based on the channel that the user selects, the broadcast singal that the user is selected carries out being separated into sound and picture signal after the demodulation simultaneously, and after treatment with relevant sound and picture signal, the image display of exporting by screen-picture and loud speaker, observe its kind, usually based on the most widely used cathode-ray tube CRT, for satisfying high picture quality/big picture characteristic requirement, the TV that uses LCD LCD, plasma display PDP etc. is arranged.
Particularly, the situation of plasma display PDP on its architectural characteristic, is compared can make quite thin with existing cathode-ray tube CRT; Simultaneously to compare light characteristic outstanding especially with LCD LCD, therefore can satisfy the key technology as television set; And layout characters such as wall picture layout are outstanding, therefore are subjected to people's attention as TV of future generation.
Following with reference to accompanying drawing, describe as follows to the contrast control device of conventional art image display:
Fig. 1 is the image display general block diagram of conventional art; Fig. 2 be shown in Fig. 1 based on the expression automatic brightness limiter ABL voltage pattern that is transfused to video level; Fig. 3 is the general block diagram of the flat panel image display of conventional art.
The image display of conventional art is to be made of following part as shown in Figure 1: cathode-ray tube CRT 5; The high pressure that produces offers the kickback transformer FBT1 of cathode-ray tube CRT 5; Receive the high pressure of kickback transformer FBT 1 output, and for regulating the automatic brightness limiter ABL (Auto BeamLimit) 2 that is provided with to the too much electron beam (Beam) of cathode-ray tube CRT 5 inputs; Regulate the automatic brightness limiter ABL level adjustment part 3 of automatic brightness limiter ABL 2 level according to automatic brightness limiter ABL 2 output signals (V_abl0); Adjust in the picture signal that signals (V_abl1) import according to automatic brightness limiter ABL level adjustment part 3, receive the color processing portion 4 that input signal except luminance signal (Y) carries out outputing to after the color processing cathode-ray tube CRT 5.
To the image display of the conventional art of above-mentioned formation, in order to prevent to use automatic brightness limiter ABL 2 circuit usually to the too much electron beam (Beam) of cathode-ray tube CRT 5 inputs; And automatic brightness limiter ABL 2 circuit are carried out in the raising in order further to improve contrast, low level contrast function.
Promptly, electron beam (Beam) electric current that flows in cathode-ray tube CRT 5 of the video level that is transfused to is scaled automatic brightness limiter ABL magnitude of voltage as shown in Figure 2, magnitude of voltage reduces till arriving the regulation place as seen from the figure, but keeps certain magnitude of voltage when above to certain level.
On the other hand, describe as follows to formation and the work of using in recent years thereof as the image display of flat display boards such as LCD LCD and plasma display PDP:
The flat panel image display of conventional art is made up of following part as shown in Figure 3: in the picture signal that is transfused to, with the switch portion of exporting 10 of analog signal selection; To be transformed to the analog digital converter ADC 20 of digital signal from the analog signal of switch portion 10 outputs; The digital signal conversion that has been transformed that receives from analog digital converter ADC 20 is the format converter 30 that can support relevant image display form; Reception is from the data image signal of format converter 30 output, and to the picture signal of this input, in order to improve image quality and to adjust image quality and the picture signal handling part 40 that is provided with; Processed picture signal in picture signal handling part 40 is suitable for the display control unit 50 that relevant display part 60 characteristics are provided with for this picture signal is processed into; For showing the display part 60 that is provided with from the picture signal of display control unit 50 outputs.At this moment, above-mentioned display part 60 normally is made of the flat panel image display of LCD LCD or plasma display PDP etc.
Following explanation is carried out in work as traditional flat panel image display of above-mentioned formation.At first, if the input analog picture signal, then switch portion 10 will be selected this analog signal, and be arranged to this analog signal and be input to analog digital converter ADC 20; Simultaneously in analog digital converter ADC 20, be transformed to digital signal.The picture signal form that be transfused to this moment is various ways normally.
That is, though 480i/480p/720p/1080i or the like---various synchronizing signal, usually the display video format setting that adopts is identical form, therefore sets the laggard line translation of form in format converter 30.
Data image signal through format converter 30 is input to picture signal handling part 40, and improves the work of image quality and adjustment image quality therein; Be input to display control unit 50 then and be treated to the picture signal that is suitable for display part 60 characteristics therein; Show by display part 60 then.
Particularly, as LCD LCD situation,, therefore can not read the automatic brightness limiter ABL voltage that is similar to cathode-ray tube CRT owing to dependency relation between the power consumption of brightness that can not form picture and demonstration link; Again because the delay time of Digital Image Processing is quite long, even if be similar to automatic brightness limiter ABL voltage so detect, but it is asynchronous between the contrast adjustment work in its automatic brightness limiter ABL voltage and Digital Image Processing stage, therefore among the automatic brightness limiter ABL that utilizes the cathode-ray tube CRT type/the low level contrast improves function, has unconformable problem.
Summary of the invention
The present invention develops for the problem that solves above-mentioned existence.The present invention is to the automatic brightness limiter ABL pattern of traditional use cathode-ray tube CRT image display, when using flat-plate picture displaying apparatus, considered its unworthiness, therefore detect average level within a certain period of time from analog picture signal self, and come control signal source images signal amplification factor according to detected level, thereby can improve picture signal dark in flat panel image display, promptly in, the low-luminosity picture signal contrast.Purpose of the present invention just provides the contrast control device of above-mentioned image display.
The image display of the present invention that proposes for achieving the above object, promptly using flat panel image display is to be made of following part: the amplification coefficient control part that comes control signal source images signal amplification factor according to the analog picture signal mean flow rate voltage level that is transfused to; Be transformed to the analog digital converter ADC of data image signal from the controlled analog image input signal of amplification coefficient control part reception; The data image signal that has been transformed that receives from analog digital converter ADC is transformed to the format converter that can support relevant image display form; Receive the output signal of format converter, and with this signal processing for can in relevant display device, showing the picture signal handling part that is provided with.
The amplification coefficient control part is to be made of following part: in the signal source luminance signal, and the buffer that the luminance signal of wanting to handle for separation is provided with; In the separated luminance signal of buffer, for separating the clamp circuit that synchronizing signal is provided with; In the luminance signal of clamp circuit output, for detecting the low pass filter LPF that average level is provided with; To the signal that detects among the low pass filter LPF, for carrying out the anti-phase inverting amplifier that is provided with; From inverting amplifier, receive anti-phase voltage signal, and according to controlling the voltage-adjusting amplifier of amplification coefficient with the signal source luminance signal classification grade degree that is transfused to.
The contrast control device of image display of the present invention has following effect:
First, before the picture signal of input analog digital converter ADC, screen by low-frequency band filtering, detection type is similar to the automatic brightness limiter ABL voltage of cathode-ray tube CRT, and with detected voltage the signal source picture signal is controlled by classification grade in voltage-adjusting amplifier, therefore can improve contrast.
The second, also can in cathode-ray tube CRT, obtain and automatic brightness limiter ABL circuit identical function without automatic brightness limiter ABL circuit.
The 3rd, in the image display that uses the plane to show, in can improving/contrast of low-luminosity picture, and improve the black level extending length.
Description of drawings
Fig. 1 is the contrast control device block diagram of conventional art image display.
Fig. 2 is based on the output voltage graph of a relation of the expression automatic brightness limiter ABL circuit that is transfused to picture level.
Fig. 3 is the contrast control device block diagram of the flat panel image display of conventional art.
Fig. 4 is the contrast control device block diagram of image display of the present invention.
Fig. 5 is the more detailed block diagram at the amplification coefficient control part shown in Fig. 4.
Fig. 6 is in the contrast control part signal I/O oscillogram shown in Fig. 5.
Fig. 7 is the oscillogram that is illustrated in the output waveform of voltage-adjusting amplifier shown in Fig. 4 of average voltage level.
To drawing major part symbol description:
10: switch portion; 100: the amplification coefficient control part;
20: analog digital converter ADC; 30: format converter;
40: the picture signal handling part; 50: display control unit;
60: display part.
Embodiment
Following with reference to accompanying drawing, the contrast control device to image display of the present invention describes as follows in more detail:
Fig. 4 is based on the contrast control device block diagram of image display of the present invention; Fig. 5 is the more detailed block diagram at the expression amplification coefficient control part shown in Fig. 4; Fig. 6 is the I/O oscillogram between the amplification coefficient control part component parts; Fig. 7 be shown in Figure 5 in low pass filter LPF the voltage-adjusting amplifier amplification coefficient figure of detected average voltage level.
The contrast control device of image display of the present invention is to be made of following part as shown in Figure 4: in the picture signal that is transfused to, be the switch portion 10 of selecting analog signal to be provided with; Control the amplification coefficient control part 100 of contrast according to selecteed analog picture signal brightness in the switch portion 10; Be transformed to the analog digital converter ADC 20 of digital signal from the controlled analog image input signal of amplification coefficient control part 100 receptions; The digital signal conversion that has been transformed that receives from analog digital converter ADC 20 is the format converter 30 that can support relevant image display form; The picture signal of conversion in format converter 30 is handled the picture signal handling part 40 that is provided with for improving image quality and frame update quality; Receive the output signal of picture signal handling part 40, and the display control unit 50 that this signal processing is provided with for the signal that can show in display part 60; For showing the display part 60 that is provided with from the picture signal of display control unit 50 outputs.
Amplification coefficient control part 100 is to be made of following part as shown in Figure 5: in the signal source luminance signal that is transfused to, and the buffer 101 that the luminance signal of wanting to handle for separation is provided with; In the separated luminance signal of buffer 101, for separating the clamp circuit 102 that synchronizing signal is provided with; In the luminance signal of clamp circuit 102 outputs, for detecting the low pass filter LPF 103 that average level is provided with; To the signal that detects among the low pass filter LPF 103, for carrying out the anti-phase inverting amplifier that is provided with 104; From inverting amplifier 104, receive anti-phase voltage signal, and according to controlling the voltage-adjusting amplifier 105 of amplification coefficient with the signal source luminance signal classification grade that is transfused to.
Above-mentioned display part 60 is exactly the flat panel image display of liquid crystal indicator LCD or plasma display PDP etc.
Contrast control device as the image display of the present invention of above-mentioned formation is moved following explanation.If (Y1, Y2 Y3---), then select analog picture signal to export therein to switch portion 10 input luminance signals; Selecteed luminance signal is input to amplification coefficient control part 100, and regulates contrast automatically according to the picture carrier that is transfused to, and simultaneously the signal that is conditioned is input to analog digital converter ADC 20, and is transformed to data image signal therein.
100 work describe as follows with reference to Fig. 6 to the amplification coefficient control part.Selecteed picture signal (V_O) is input to buffer 101 and voltage-adjusting amplifier 105 in switch portion 10; And the signal source picture signal of 101 pairs of inputs of buffer promptly in order (V_O) to read and the similar voltage of automatic brightness limiter ABL voltage from luminance signal (Y), is separated the primary image signal of wanting to handle.
Because separated primary image signal is to be formed by luminance signal (Y) and synchronizing signal, therefore the waveform of getting in 102 years by clamp circuit (V-C) is exported.
Because picture brightness can define with the average level of the full images signal that constitutes a frame (being picture), therefore for pressing dark image of signal distinguishing and bright image, by averaging of suitable correction number (mean value of a frame), the waveform V-L that is undertaken after low-frequency band is screened by low pass filter LPT 103 exports with luminance signal.
Waveform (V-L) after the screening of low pass filter LPT 103 medium and low frequency bands is input to inverting amplifier 104 and process anti-phase laggard line output signal (V-I).As above-mentioned, the signal (V-I) of inverting amplifier 104 outputs is input to voltage-adjusting amplifier 105; And voltage-adjusting amplifier 105 is according to controlling amplification coefficient with the classification grade of signal source picture signal (V_O).
That is, dark picture low level signal is to improve voltage amplification coefficient, and bright picture high level signal is to suppress voltage amplification coefficient.
As above-mentioned, controlled output signal (V_A) is input to analog digital converter ADC 20, and is transformed to data image signal therein; And the data image signal that is transformed is transformed to the form of supporting relevant image display in format converter 30.
The output signal of format converter 30 is input to picture signal handling part 40, and improves digital processing work such as image quality therein; Signal after treatment is input to display control unit 50, and shows in the image display of relevant display part (LCD LCD or plasma display PDP) 60 etc.
The contrast control device of image display of the present invention, the analog picture signal that will be transfused to carry out low-frequency band filtering screening back and detect average voltage level; And regulate the analog picture signal amplification coefficient that is transfused to detected average voltage level, the present invention that Here it is proposes can improve in/scheme of the contrast of low level luminance picture.
Particularly, in low-frequency band the voltage of filtered screening as shown in Figure 7, the low level picture signal is improve to exchange amplification coefficient, and the high level picture signal is opposite direction action, therefore enlarge the dynamic band of low middle level diagram image signal, thereby improved contrast.
Claims (2)
1. the contrast control device of an image display, it is characterized in that using flat panel image display is to be made of following part:
In the picture signal that is transfused to, be the switch portion of selecting analog signal to be provided with;
Come the amplification coefficient control part of control signal source images signal amplification factor according to selecteed analog picture signal mean flow rate voltage level in the switch portion;
Be transformed to the analog digital converter of data image signal from the controlled analog input signal of amplification coefficient control part reception;
The data image signal that has been transformed that receives from analog digital converter is transformed to the format converter that can support relevant image display form;
Receive the output signal of format converter, and with this signal processing for can in relevant display unit, showing the picture signal handling part that is provided with;
Receive the output signal of picture signal handling part, and the display control unit that this signal processing is provided with for the signal that can show in display part;
For showing the display part that is provided with from the picture signal of display control unit output;
Described amplification coefficient control part is to be made of following part:
In the signal source luminance signal, the buffer that the luminance signal of wanting to handle for separation is provided with;
In the separated luminance signal of buffer, for separating the clamp circuit that synchronizing signal is provided with;
In the luminance signal of clamp circuit output, for detecting the low pass filter that average level is provided with;
To the signal that detects in the low pass filter, for carrying out the anti-phase inverting amplifier that is provided with;
From inverting amplifier, receive anti-phase voltage signal, and according to controlling the voltage-adjusting amplifier of amplification coefficient with the signal source luminance signal classification grade degree that is transfused to.
2. the contrast control device of image display according to claim 1 it is characterized in that described voltage-adjusting amplifier is that dark picture low level signal increases amplification coefficient, and bright picture high level signal reduces amplification coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100208133A CN100417211C (en) | 2004-06-23 | 2004-06-23 | Contrast controller of image displaying device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100208133A CN100417211C (en) | 2004-06-23 | 2004-06-23 | Contrast controller of image displaying device |
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| CN1713703A CN1713703A (en) | 2005-12-28 |
| CN100417211C true CN100417211C (en) | 2008-09-03 |
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| CNB2004100208133A Expired - Fee Related CN100417211C (en) | 2004-06-23 | 2004-06-23 | Contrast controller of image displaying device |
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| CN108337444B (en) * | 2018-02-06 | 2018-12-28 | 青岛大学 | The extraction system and method for invisible video image under high brightness and dark lightness environment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63121366A (en) * | 1986-11-10 | 1988-05-25 | Sony Corp | Television receiver |
| CN1074792A (en) * | 1992-01-21 | 1993-07-28 | 三星电子株式会社 | Automatic picture quality compensating method and equipment |
| CN1210430A (en) * | 1997-07-07 | 1999-03-10 | 三星电子株式会社 | Analog/digital color video apparatus and method for adjusting attributes of color video signal using digital signal processing |
| CN1246952A (en) * | 1997-12-10 | 2000-03-08 | 松下电器产业株式会社 | Display apparatus capable of adjusting number of subframes to brightness |
-
2004
- 2004-06-23 CN CNB2004100208133A patent/CN100417211C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63121366A (en) * | 1986-11-10 | 1988-05-25 | Sony Corp | Television receiver |
| CN1074792A (en) * | 1992-01-21 | 1993-07-28 | 三星电子株式会社 | Automatic picture quality compensating method and equipment |
| CN1210430A (en) * | 1997-07-07 | 1999-03-10 | 三星电子株式会社 | Analog/digital color video apparatus and method for adjusting attributes of color video signal using digital signal processing |
| CN1246952A (en) * | 1997-12-10 | 2000-03-08 | 松下电器产业株式会社 | Display apparatus capable of adjusting number of subframes to brightness |
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| Publication number | Publication date |
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| CN1713703A (en) | 2005-12-28 |
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Effective date of registration: 20070601 Address after: 210038 No. 346 Yao Yao Avenue, Nanjing economic and Technological Development Zone, Jiangsu, China Applicant after: LG Electronics Nanjing Display Co., Ltd. Address before: 110179 35,40, hi tech Development Zone, Liaoning, Shenyang Applicant before: LG Electronic (Shenyang) Co., Ltd. |
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