CN1759431A - Control of a display - Google Patents

Control of a display Download PDF

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Publication number
CN1759431A
CN1759431A CN03826175.8A CN03826175A CN1759431A CN 1759431 A CN1759431 A CN 1759431A CN 03826175 A CN03826175 A CN 03826175A CN 1759431 A CN1759431 A CN 1759431A
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CN
China
Prior art keywords
brightness
display
display panel
control
contrast
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN03826175.8A
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Chinese (zh)
Inventor
彼得鲁斯·M·德格雷夫
马蒂亚斯·克吕特兹曼
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Publication of CN1759431A publication Critical patent/CN1759431A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
    • G09G3/294—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for lighting or sustain discharge
    • G09G3/2944—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for lighting or sustain discharge by varying the frequency of sustain pulses or the number of sustain pulses proportionally in each subfield of the whole frame
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0606—Manual adjustment
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/066—Adjustment of display parameters for control of contrast
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G09G3/2077—Display of intermediate tones by a combination of two or more gradation control methods

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Power Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of Gas Discharge Display Tubes (AREA)

Abstract

Controlling contrast and brightness in a display panel by means of either an automatic power control unit, already controlling luminance of the display panel by varying a number of sustain pulses per second, or a timing and control unit, controlled by software process which is already controlling luminance of the display panel by varying a number of sustain pulses per second.

Description

The control of display
Invention field
The present invention relates to the control of display, more specifically, relate to the contrast and the brilliance control of display.
Technical background
Now, there is multiple different type of display.When seeing display, the user wants to regulate brightness and/or other settings of display sometimes, to obtain picture preferably.Sometimes can change the change environment into, for example create a darker environment.Usually will regulate the use that combines with environmental baseline will be set.The canonical parameter that can change in display is contrast and brightness.In common (numeral) display system, before carrying out the gamma compensation, can in video flowing, regulate contrast and brightness.This can be with a formulate that comprises gamma:
L out＝{B+C×(Video in/2 n-1)} y (I)
Wherein
Video In=digital video input signal
L Out=brightness is from the light of display
B=luminance compensation (0＜B＜1, typical default value B=0)
C=contrast rating (0＜C, typical default value C=1)
N=resolution (bit number, typical default value n=8)
Y=Gamma value (1＜y＜3, typical default value y=2.4)
In Plasmia indicating panel (PDP), control module can be used to control the electric energy that display consumes, and for example makes intensity level force to reduce, thereby energy consumption is reduced to below the predeterminated level.Automated power control (APC) unit can prevent PDP (power supply of panel and PDP) overload.In conventional APC unit, usually the average current that flows through the high-voltage power supply that drives PDP by detection detects power consumption.Typically, detected current value and reference value are compared, and the signal that drives PDP is periodically regulated in the APC unit.
US-A-5956014 has described and will be converted into the digital brightness value by the analoging brightness value of variable resistor setting.
When the APC unit limited the brightness of PDP, contrast in the video flowing and brightness were provided with and will can not produce institute's prediction result, and the APC unit will be adjusted to new setting simultaneously.This means and to obtain best display performance.
Summary of the invention
Target of the present invention is for display provides a kind of method and apparatus, improves contrast and brilliance control with device by this method.By independently claim qualification the present invention.Dependent claims defines the embodiment that has superiority.
Preferably, realize this target by near contrast and the brilliance control that display, is independent of Video processing.Preferably, degree of comparing and brilliance control in existing power control unit, wherein existing power control unit is generally the brightness APC unit that control is generally the display panel of PDP.So only provide best display performance with a spot of additional hardware cost.In addition, owing to this unit separates with Video processing, so Digital Video Processing can not be affected.Advantageously, by changing the number of keeping pulse p.s., the adjusting of degree of comparing and brightness in the APC unit.With this method, newly be provided with the generation predictable results.
With reference to the embodiment that hereinafter describes, what these and other aspect of the present invention will become is apparent and clear.
The accompanying drawing summary
According to following to the preferred embodiments of the present invention description and in conjunction with reference to the accompanying drawings, understand the present invention with clearer, wherein:
Fig. 1 illustrates PDP and produces light;
Fig. 2 illustrates the PDP reflected light;
Fig. 3 illustrates PDP and produces and reflected light;
Fig. 4 illustrates PDP and produces, reflected light and surround lighting; And
Fig. 5 illustrates the structure of AC driving plasma display system according to a preferred embodiment of the invention.
Detailed Description Of The Invention
Referring now to accompanying drawing, the PDP equipment of detailed description different embodiment according to the subject invention, plasma display controller and method for driving plasma display device.
Below, PDP equipment will be described; Yet, be noted that this only is an example of type of display.The display of other types is generally other sons display that drives, and for example LCD (LCD) etc. is also in claims of the present invention in the illustrated scope.
The user is furnished with the preference that a cover control device is adjusted to display in the particular environment or Video processing is adjusted into the individual usually.In some displays, the automatic processing of the data-driven of origin autobiography sensor can be satisfied for the particular environment condition and regulates display.Other display needs the user to provide feedback by user control.Yet, except these are regulated, the user perhaps wants to change some and is provided with to satisfy individual's preference, for instance: color saturation, higher contrast under particular gray level (for example in order to watch the background of the terrified scene of a width of cloth), histogram control or color dot (with the warm colour that obtains image or the impression of cool colour).These are and the irrelevant typical Video processing of environmental baseline.
The picture quality of PDP equipment depends on following parameters, for example: black level, contrast (darkroom/dim environment/daytime), dynamic peak white (zonule and short time), average peak white level (large tracts of land and continuous), white point (for example D65), the quantity of displayable gray shade scale, and shake.Contrast and brilliance control are provided with for the user, and it influences the brightness and contrast.1-4 describes it below with reference to the accompanying drawings.
In Fig. 1, PDP1 is shown produces light (from the arrow explanation of the outside outgoing of PDP).Contrast (CR) is obeyed formula:
CR＝L max/L min (II)
L wherein Min=minimum brightness (light), and L Max=high-high brightness (light).
In Fig. 2, PDP is with incident light (L In) reflection, become reflected light (L Ref).Reflectivity (r) can be expressed as formula:
r = L ref / L in < 1 - - - ( III )
PDP shown in Figure 3 produces and reflected light, and wherein CR can be formulated as:
CR＝n×(L max+n×r×L in)/n×(L min+n×r×L in) (IV)
N=filter plate transparency＜1 wherein.
If with shown in Figure 4, PDP also is subjected to surround lighting (L Amb) influence, CR can use following formulate:
CR＝{n×(L max+n×r×L in)+x×(L amb)}/{n×(L minn×r×L in)+x×(L amb)} (V)
Wherein x=influences the part (0＜x＜1) of the surround lighting of sensation.
Formula (III)-(V) explanation L InAnd L AmbReduce theoretic CR.In addition, they also illustrated should be with L MinKeep as much as possible little (producing less light) in the addressing and the stage of wiping.Can be by reducing to reduce L at the n of panel front RefBut this also reduces L`=n * L MaxCan reduce L by in dim environment, working InAnd L Amb, promptly for example draw the curtain together.
Method for controlling display panel according to a preferred embodiment of the invention will be discussed now.This method comprises that the brightness by the control display panel provides the step of the manual control of contrast and/or brightness.
This will organize in the formula further at next and discuss, and these formula have compared to handle in video with handling in brightness domain compares the effect of adjusting contrast and brightness:
L out＝{B+C×(Video in/2 n-1)} y＝B′+C′×(Video in/2 n-1) y
Suppose y=2 and B '=B 2, C '=C 2, formula becomes:
L out＝{B+C×(Video in/2 n-1)} 2＝B 2+C 2×(Video in/2 n-1) 2
L out＝B 2+2BC×(Video in/2 n-1)+C 2×(Video in/2 n-1) 2＝B 2+C 2×(Video in/2 n-1) 2
L dif＝2BC×(Video in/2 n-1)
When brilliance control B=0, luminance difference L Dif=0.
This can prove that when B=0, degree of comparing processing is what it doesn't matter in video or in the brightness domain.
Preferably, control the brightness of display panel according to formula:
Video out＝(2 n-1)×{B+C×(Video in/2 n-1)}
Wherein
Video In=digital video input signal
L Out=brightness is from the light of display
The B=luminance compensation
The C=contrast factor
N=resolution
The y=Gamma value
Perhaps in existing gamma correcting unit, according to formula:
L out＝{B+C×(Video in/2 n-1)} y
Also can control according to another formula:
L out＝{B+C×(Video in/2 n-1)-(D×|(Video in/2 n-1)-E|)} y
Will describe one embodiment of the present of invention below,, wherein illustrate how to control degree of comparing/brilliance control in (APC) unit at automated power with reference to figure 5.Fig. 5 is the structural drawing that the preferred embodiment of display system 10 according to another embodiment of the present invention is described.Display system 10 comprises having the PDP1 that is arranged in the display unit in the X-Y orthogonal matrix, processor unit 2, contrast controller 3 and automated power control module 4.
PDP1 is a general type, and because PDP well-known, so no longer more detailed description it.Contrast controller 3 is connected to automated power control module 4, perhaps can be used as the part of automated power control module.If contrast controller 3 closes on power control unit 4 or for its part, also can be only to be the scheme of software.
In AC type PDP equipment, for writing, every line wants data presented, keep PDP by keeping discharge then.The proportional variation of the quantity of keeping discharge of the brightness of PDP and each time period, and therefore can change brightness by the number of keeping discharge.
In present embodiment PDP1, the energy consumption that automated power control module 4 is regulated display.By changing the light of p.s. number of keeping pulse of PDP being regulated generation.After the picture load of determining a frame, can strengthen or weaken the light that image produces, saved (save) and monitored PDP.
In conventional PDP equipment, if the APC unit is weakening image to cut down the consumption of energy or during temperature, just to have weakened the brightness of image.In the case, perhaps the user can attempt to change the contrast setting to increase brightness.When the amplified video data, the APC unit can weaken graphical representation at once, get back to initial level, but quality has reduced.This can be avoided by the contrast setting being offered automated power control module according to the present invention, as what carry out in the embodiment shown in Fig. 5.
Preferably, according to another preferred embodiment of the invention, can satisfy the user to allow the user that parameter is set by Configuration Control Unit 3.
Like this, controllable contrast of user and brightness setting can not influence Digital Video Processing, because this setting is carried out carry out processing in processor 2 after.Therefore, can make full use of all available dynamic ranges for the video data processing.
According to another preferred embodiment of the invention, according to set-point,, just can set contrast and the brightness of PDP by increasing or reduce the number (each time period) of the son field of given PDP1 being kept pulse.This is a kind of point-device controlling mechanism, and it provides best and predictable adjusting.
Because according to formula:
L out＝{B+C×(Video in/2 n-1)} y (I)
Brilliance control, it is saturated that the compensation in video level will produce the color less with respect to original image.When with brightness regulation during to the black level of display, this is unimportant.To keep pulse supplies with full addressing (fully addressed) display and can produce excellent luminance control effect.This can realize by the whole line of an addressing rather than the addressing of a line of a line, save the time.
For PDP, brightness is made as " 0 " usually, and this moment, the pixel of minimum brightness was high-visible.
The level (C) of keeping that amplifies the son field is similar to the effect of regulating contrast.Can notice, in brightness domain rather than in visual domain, carry out these variations, however this not influence.
Because contrast controller 3 is implemented in automated power control module 4,, can provide by software-driven, the unusual small amount display performance of the best of hardware spending outward preferably at it regularly and in the control module (not shown).
When in timing and control procedure, having carried out the control of contrast and brightness, can comprise different timing modes.Temporarily display is driven being higher than on the automated power control level of suggestion, the demand better matching with the user can be provided.
Usually; Display can be supported the gray level of limited quantity in conjunction with shake.When user's control and APC adjusting video level; Be the progressively change procedure that each pixel is calculated video level.The dynamic range of video data must allow to increase video level.Suppose that user's control and APC regulate this and keep level; The step change of keeping level will cause in more accurate resolution hypograph demonstration and change.In the case, a son weights of video processing chain and binary distributed are irrelevant. be for example: 1248 16 32 64 128 pairs of each continuous subfields of video level produce for example following level of keeping: 48 16 32 64 128 256 51225% minimizing represents that each continuous subfield is had the following level of keeping: 36 12 24 48 96 192 38410% minimizing represents that the following level of keeping is arranged: 3.6 7.2 14.4 28.8 57.6 115.2 230.4 460.8 can realize the interrupted level of keeping by the means of temporarily keeping shake.
In display panel, can pass through the automated power control module, the number that utilizes the change per second to keep pulse is controlled the brightness of display panel, perhaps by the timing and the control module of software processes control, the number that utilizes the change per second to keep pulse is controlled the brightness of display panel, thereby control contrast and brightness realize the present invention.Also can rely on user's brightness control signal, by waveform and/or the quantity of suitable adjusting by the erasing pulse of timing and control module generation, with the generation of control light between the erasing period of display panel, thus control brightness.
Be noted that embodiment explanation above-mentioned rather than restriction the present invention, and those skilled in the art should design the embodiment of many replacements in the scope that does not break away from additional claims.In claims, any label in parenthesis should be interpreted as restriction to claim.Word " comprises " and is not precluded within those elements or the step outside listed in the claim.Word before element " one " or " one " do not get rid of the situation that has a plurality of such elements.The present invention can realize by the hardware that comprises a plurality of different elements, and realize by the computing machine that process is suitably programmed.In having enumerated the device claim of several devices, several in these devices can be implemented by the identical project of hardware and hardware.In fact, some means is put down in writing in mutually different dependent claims and is not represented that these means can not be used in combination with having superiority.

Claims (4)

1. display panel opertaing device comprises:
Be used to handle vision signal to produce the device (6) of processed video signal;
Be used for producing the device (2) of plurality of sub field according to described processed video signal;
According to described processed video signal, per second produces a plurality of gating pulse and is used to provide the device (3 of automated power control, 4), wherein by multiply by the identical factor for all sons pulse number of keeping with each time period, user's contrast that dependence is used on the described gating pulse generation device (3,4) is controlled contrast.
2. according to the display panel opertaing device of claim 1, wherein increase or reduce a given luminance compensation value by the pulse number of keeping that each time period is applied to stator field, dependence is used the user's brilliance control on the described gating pulse generation device (3,4) and is controlled brightness.
3. according to the display panel opertaing device of claim 1, wherein by the generation of control light between erasing period, dependence is used the user's brightness control signal on the described gating pulse generation device (3,4) and is controlled brightness.
4. display system comprises display panel (1) and according to the display panel opertaing device of claim 1.
CN03826175.8A 2003-03-20 2003-03-20 Control of a display Pending CN1759431A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2003/001148 WO2004084167A1 (en) 2003-03-20 2003-03-20 Control of a display

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CN1759431A true CN1759431A (en) 2006-04-12

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EP (1) EP1609130A1 (en)
CN (1) CN1759431A (en)
AU (1) AU2003209955A1 (en)
WO (1) WO2004084167A1 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3891499B2 (en) * 1995-04-14 2007-03-14 パイオニア株式会社 Brightness adjustment device for plasma display panel
JP3580027B2 (en) * 1996-06-06 2004-10-20 株式会社日立製作所 Plasma display device

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EP1609130A1 (en) 2005-12-28
WO2004084167A1 (en) 2004-09-30

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