CN101334958A - Flat display device brightness improving method - Google Patents

Abstract

The invention relates to an improving method for luminance of a flat panel display device by utilizing a correction circuit of panel luminance grey scale and a compensation circuit of panel luminance error against the problem existing in the prior art that video displaying of flat panel display devices processed in a large-batch production is consistently quite poor. The method of the invention comprises an image signal input step, an error diffusion compensation step, a luminance measurement step, a panel luminance grey scale correction step or/and panel luminance error compensation step. The method of the invention solves grey scale error and simultaneously resolves effectively the problem that an error between actual output luminance and ideal output luminance of the flat panel display device is existed.

Description

The improvement method of flat display device brightness

Technical field

The present invention relates to brightness control system, specifically a kind of improvement method of flat display device brightness.

Background technology

Flat-panel display devices, particularly liquid crystal display because the difference of panel self physical characteristics, cause the image display consistency of the end product that processes in large batch of production relatively poor.As when the given fixed signal of front end inputs to panel, there is certain difference in the brightness meeting that panel presents, and what cause that image brilliance on terminal consumption product in batches shows is inconsistent.

Summary of the invention

The present invention is directed to the relatively poor problem of image display consistency of the flat-panel display devices that in large batch of production, processes in the prior art, design a kind of improvement method of utilizing the flat display device brightness of panel luminance GTG correction circuit, panel luminance error compensation circuit.

In order to solve above technical matters, the present invention is achieved by the following technical solutions:

A kind of improvement method of flat display device brightness comprises the following steps:

A. the picture signal input step is imported a series of GTG signal Gray to flat-panel display devices;

B. the error diffusion compensation process utilizes the error diffusion compensating circuit that the GTG signal Gray of input is compensated processing;

C. brightness measurement step;

It is characterized in that, also comprise:

D. panel luminance GTG correction step is or/and panel luminance error compensation step, under luminous keeping of keeping frequency f s, utilize panel luminance GTG correction circuit or/and the panel luminance error compensation circuit, GTG signal Gray to input improves, and the final actual output brightness Y that makes flat-panel display devices is near desirable output brightness Y _Idael

Wherein, described panel luminance GTG correction step comprises:

(1). according to the actual output brightness Y of a series of input GTG signal Gray _MeaWith ideal output brightness Y _IdealCorresponding relation, set up an intensity gray scale correction table of comparisons, this table comprises the actual output brightness Y of a series of conversion GTG Gray ' and conversion GTG correspondence _BG

(2). when a GTG signal Gray imports, draw the intrinsic brilliance Y of this GTG signal output by tabling look-up _MeaCorresponding conversion GTG Gray ';

(3). will change GTG Gray ' and import same flat-panel display devices, making the final actual output brightness Y of flat-panel display devices is Y _BGNear desirable output brightness Y _Ideal

Described panel luminance error compensation step comprises:

(1). according to the actual output brightness Y of a series of input GTG signal Gray _MeaWith ideal output brightness Y _IdealMagnitude relationship, set up luminance errors compensation table of comparisons, this table comprises the conversion GTG Gray of a series of luminance errors offset Δ Y and Δ Y correspondence ";

(2). when a GTG signal Gray imports, draw the conversion GTG Gray of the intrinsic brilliance Y correspondence of this GTG signal output by tabling look-up ";

(3). GTG signal Gray is added conversion GTG Gray " together import same flat-panel display devices, making the final actual output brightness Y of flat-panel display devices is Y _BENear desirable output brightness Y _Ideal

Described luminance errors offset Δ Y is drawn by following formula:

if?Y _ideal(fs，g)≥Y _mea(fs，g)

$\mathrm{\ΔY}=\frac{Y_{\mathrm{ideal}}(\mathrm{fs},g)-Y_{\mathrm{mea}}(\mathrm{fs},g)}{Y_{\mathrm{mea}}(\mathrm{fs},g+1)-Y_{\mathrm{mea}}(\mathrm{fs},g)}$

if?Y _ideal(fs，g)＜Y _mea(fs，g)

$\mathrm{\ΔY}=\frac{Y_{\mathrm{ideal}}(\mathrm{fs},g)-Y_{\mathrm{mea}}(\mathrm{fs},g)}{Y_{\mathrm{mea}}(\mathrm{fs},g)-Y_{\mathrm{mea}}(\mathrm{fs},g-1)}$

Wherein, suppose that the frequency of this moment is fs=f, GTG signal value Gray=g.

Compared with prior art, the invention has the beneficial effects as follows:

The present invention designs a kind of simple panel luminance GTG correction circuit, panel luminance error compensation circuit of utilizing and solves flat-panel display devices because the difference of panel self physical characteristics, cause when the given fixed signal of front equipment end inputs to panel, there is the problem of certain difference in the brightness meeting that panel presents, improve the consistance of the end product image demonstration that in production in enormous quantities, processes, improved manufacturer's the production efficient and the quality of production of product simultaneously.

Description of drawings

Fig. 1 is the discharge time of three look discharge cells in each pixel of traditional liquid crystal flat panel display and the proportionate relationship curve map between original brightness.

Fig. 2 is the discharge time of three look discharge cells in each pixel of traditional liquid crystal flat panel display and the proportionate relationship curve map between homogenization brightness.

Fig. 3 is first the best of the present invention is carried out correcting process to the input GTG a schematic flow sheet.

Fig. 4 is second the best of the present invention is carried out correcting process to the input GTG a schematic flow sheet.

Fig. 5 is the 3rd the best of the present invention is carried out correcting process to the input GTG a schematic flow sheet.

Fig. 6 is the graph of relation of brightness value before and after the present invention's first the best compensates the input GTG.

Fig. 7 is the graph of relation of luminance errors before and after the present invention's second the best compensates the input GTG.

Embodiment

Bottom does in further detail the present invention with embodiment in conjunction with the accompanying drawings and describes:

A kind of improvement method of flat display device brightness comprises the following steps:

A. the picture signal input step is imported a series of GTG signal Gray to flat-panel display devices;

B. the error diffusion compensation process utilizes the error diffusion compensating circuit that the GTG signal Gray of input is compensated processing;

C. brightness measurement step;

D. panel luminance GTG correction step is or/and panel luminance error compensation step, under luminous keeping of keeping frequency f s, utilize panel luminance GTG correction circuit or/and the panel luminance error compensation circuit, GTG signal Gray to input improves, and the final actual output brightness Y that makes flat-panel display devices is near desirable output brightness Y _Ideal

Wherein, described panel luminance GTG correction step comprises:

(1). as can be seen, input GTG signal Gray and its ideal are exported brightness Y from Fig. 1 and Fig. 2 _IdealBetween be the relation of linear equal proportion, set up an intensity gray scale correction table of comparisons thus, this table comprises the actual output brightness Y of a series of conversion GTG Gray ' and conversion GTG correspondence _BG

(2). when a GTG signal Gray imports, draw the intrinsic brilliance Y of this GTG signal output by tabling look-up _MeaCorresponding conversion GTG Gray ';

(3). will change GTG Gray ' and import same flat-panel display devices, making the final actual output brightness Y of flat-panel display devices is Y _BGNear desirable output brightness Y _Ideal

Described panel luminance error compensation step comprises:

(1). as Fig. 2, according to the actual output brightness Y of a series of input GTG signal Gray _MeaWith ideal output brightness Y _IdealMagnitude relationship, set up luminance errors compensation table of comparisons, this table comprises the conversion GTG Gray of a series of luminance errors offset Δ Y and Δ Y correspondence ";

(2). when a GTG signal Gray imports, draw the intrinsic brilliance Y of this GTG signal output by tabling look-up _MeaCorresponding conversion GTG Gray ";

(3). GTG signal Gray is added conversion GTG Gray " obtain another conversion GTG Gray " ' import same flat-panel display devices, making the final actual output brightness Y of flat-panel display devices is Y _BENear desirable output brightness Y _Ideal

Described luminance errors offset Δ Y is drawn by following formula:

if?Y _ideal(fs，g)≥Y _mea(fs，g)

$\mathrm{\ΔY}=\frac{Y_{\mathrm{ideal}}(\mathrm{fs},g)-Y_{\mathrm{mea}}(\mathrm{fs},g)}{Y_{\mathrm{mea}}(\mathrm{fs},g+1)-Y_{\mathrm{mea}}(\mathrm{fs},g)}$

if?Y _ideal(fs，g)＜Y _mea(fs，g)

$\mathrm{\ΔY}=\frac{Y_{\mathrm{ideal}}(\mathrm{fs},g)-Y_{\mathrm{mea}}(\mathrm{fs},g)}{Y_{\mathrm{mea}}(\mathrm{fs},g)-Y_{\mathrm{mea}}(\mathrm{fs},g-1)}$

Wherein, suppose that the frequency of this moment is fs=f, GTG signal value Gray=g.

As Fig. 3, first preferred forms of the present invention is:

A kind of improvement method of flat display device brightness, this method comprises: fixing luminous keeping under the frequency f s, one flat-panel display devices is imported a series of GTG signal Gray, and the brightness of this plane demonstration output device output is measured, obtain actual output brightness Y _MeaAccording to the linear equal proportion relation between input GTG and its desirable output brightness, calculate the ideal output brightness Y of this input GTG correspondence _IdealAccording to this actual output brightness Y _MeaAnd desirable output brightness Y _Ideal, set up an intensity gray scale correction table of comparisons.This table of comparisons comprises the actual output brightness Y of a series of conversion GTG Gray ' and this conversion GTG correspondence _BG, the actual output brightness Y of this conversion GTG correspondence _BGBe the ideal output brightness Y of this input GTG recently _Ideal, in view of the above, when a GTG desire is imported this flat-panel display devices, can pass through this table of comparisons, find the conversion GTG Gray ' of a correspondence earlier,, can make this flat-panel display devices output one near desirable output brightness Y with the corresponding flat-panel display devices of this conversion GTG input _IdealGTG brightness Y _BGWhen the method solves the GTG error, efficiently solve the actual output brightness and the desirable problem of exporting error between the brightness of flat-panel display devices.

As Fig. 4, second preferred forms of the present invention is:

A kind of improvement method of flat display device brightness, this method comprises: keep under the frequency f s luminous earlier, earlier by an error diffusion compensating circuit, utilize error-diffusion method, this input GTG is compensated processing, and after importing this flat-panel display devices, its output brightness is measured, obtain actual output brightness Y _MeaAccording to this actual output brightness Y _MeaAnd desirable output brightness Y _IdealSet up the luminance errors compensation table of comparisons, this table of comparisons comprises the conversion GTG Gray that a series of these tables comprise a series of luminance errors offset Δ Y and Δ Y correspondence "; In view of the above, when a GTG desire is imported this flat-panel display devices, can pass through this table of comparisons, find the conversion GTG Gray of a correspondence earlier "; GTG signal Gray is added conversion GTG Gray " obtain another conversion GTG Gray " ' import same flat-panel display devices, making the final actual output brightness Y of flat-panel display devices is Y _BENear desirable output brightness Y _IdealThis method has comprised the compensation of frequency luminance errors, promptly revise glow frequency to the display device output error that brightness caused, when solving the GTG error, efficiently solve the actual output brightness and the desirable problem of exporting error between the brightness of flat-panel display devices.

As Fig. 5, the 3rd preferred forms of the present invention is:

The third mode is the combination of first kind and second method, before the GTG to input compensates, at first the luminance errors compensating circuit is revised at the signal of input plane display device, after the error diffusion compensating circuit compensates the input GTG, by panel luminance GTG correction circuit the signal of input plane display device is revised again, the actual output of final output brightness Y, in the time of with solution GTG error, effectively solve the actual output brightness of flat-panel display devices and the error problem between desirable output brightness.

Before and after compensating from Fig. 6, Fig. 7 the graph of a relation of brightness value and luminance errors as can be known, the luminance errors after the compensation luminance errors before the compensation is little a lot.

Claims (4)

1. the improvement method of a flat display device brightness comprises the following steps:

A. the picture signal input step is imported a series of GTG signal Gray to flat-panel display devices;

B. the error diffusion compensation process utilizes the error diffusion compensating circuit that the GTG signal Gray of input is compensated processing;

C. brightness measurement step;

It is characterized in that, also comprise:

D. panel luminance GTG correction step is or/and panel luminance error compensation step, under luminous keeping of keeping frequency f s, utilize panel luminance GTG correction circuit or/and the panel luminance error compensation circuit, GTG signal Gray to input improves, and the final actual output brightness Y that makes flat-panel display devices is near desirable output brightness Y _Ideal

2. the improvement method of a kind of flat display device brightness according to claim 1 is characterized in that, described panel luminance GTG correction step comprises:

(1). according to the actual output brightness Y of a series of input GTG signal Gray _MeaWith ideal output brightness Y _IdealCorresponding relation, set up an intensity gray scale correction table of comparisons, this table comprises the actual output brightness Y of a series of conversion GTG Gray ' and conversion GTG correspondence _BG

(2). when a GTG signal Gray imports, draw the intrinsic brilliance Y of this GTG signal output by tabling look-up _MeaCorresponding conversion GTG Gray ';

(3). will change GTG Gray ' and import same flat-panel display devices, making the final actual output brightness Y of flat-panel display devices is Y _BGNear desirable output brightness Y _Ideal

3. the improvement method of a kind of flat display device brightness according to claim 1 is characterized in that, described panel luminance error compensation step comprises:

(1). according to the actual output brightness Y of a series of input GTG signal Gray _MeaWith ideal output brightness Y _IdealMagnitude relationship, set up luminance errors compensation table of comparisons, this table comprises the conversion GTG Gray of a series of luminance errors offset Δ Y and Δ Y correspondence ";

(2). when a GTG signal Gray imports, draw the conversion GTG Gray of the intrinsic brilliance Y correspondence of this GTG signal output by tabling look-up ";

(3). GTG signal Gray is added conversion GTG Gray " together import same flat-panel display devices, making the final actual output brightness Y of flat-panel display devices is Y _BENear desirable output brightness Y _Ideal

4. according to the improvement method of a kind of flat display device brightness described in the claim 3, it is characterized in that described luminance errors offset Δ Y is drawn by following formula:

if?Y _ideal(fs，g)≥Y _mea(fs，g)

$\mathrm{\ΔY}=\frac{Y_{\mathrm{ideal}}(\mathrm{fs},g)-Y_{\mathrm{mea}}(\mathrm{fs},g)}{Y_{\mathrm{mea}}(\mathrm{fs},g+1)-Y_{\mathrm{mea}}(\mathrm{fs},g)}$

if?Y _ideal(fs，g)＜Y _mea(fs，g)

$\mathrm{\ΔY}=\frac{Y_{\mathrm{ideal}}(\mathrm{fs},g)-Y_{\mathrm{mea}}(\mathrm{fs},g)}{Y_{\mathrm{mea}}(\mathrm{fs},g)-Y_{\mathrm{mea}}(\mathrm{fs},g-1)}$

Wherein, suppose that the frequency of this moment is fs=f, GTG signal value Gray=g.

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