CN101369416B - Driving method of display device - Google Patents

Abstract

A drive method of a display is suitable for driving the display having red secondary pixel, green secondary pixel, blue secondary pixel and white secondary pixel, when inputting a red-green-blue image data to the display, the display can display a max color area, the drive method of the display comprises: selecting a target color area in the max color area displayed by the display; converting the red-green-blue image data into the red-green-blue-white image data in order to display the target color area by the display; inputting the red-green-blue-white image data into the display to drive the display. The drive method can effectively increase the image brightness and improve the condition that the display image is not continuous under the condition without losing the color saturation greatly.

Description

The driving method of display

Technical field

The present invention relates to a kind of driving method of display, and be particularly related to a kind of driving method that R-G-B view data (R-G-B image data) is converted to the display of R-G-B-Bai view data (R-G-B-W image data).

Background technology

Have that high image quality, space utilization efficient are good, (Liquid Crystal Display LCD) becomes the main flow of display to the LCD of low consumpting power, advantageous characteristic such as radiationless gradually.For satisfying user's demand, each manufacturer all is devoted to the exploitation of high color rendition (color reproduction) technology, and the color saturation of the exploitation of high color reproducing technology and Backlight For Liquid Crystal Display Panels and color filter film (colorsaturation) is closely bound up.

In order to allow display that preferable brightness performance can be arranged, the display with red, green, blue, white four sub pixels is suggested, though the display of this type has preferable brightness performance, color saturation regular meeting decreases because of white sub-pixels.In detail, when display when showing pure color (as red, green, blueness) picture, if white sub-pixels is opened, will cause pure color picture color saturation obviously to reduce; Otherwise,, also cause the discontinuous visual experience of image easily if white sub-pixels is not opened.Therefore, the brilliance control of white sub-pixels just becomes one of display significant consideration when driving of this type.In other words, how finding equilibrium point between the continuity of the color saturation of pure color picture and image, is one of display problem demanding prompt solution of this type.

At present, Kodak company and Canon company are respectively in No. 6,885,380, its U.S. Pat and U.S. Pat 5, mention the video data (W display data) that how calculates white sub-pixels in 929, No. 842 from R-G-B view data (R-G-B imagedata).Yet the purpose of above-mentioned patent all is to get rid of display image generation jagged edge, and whether its color saturation of not considering display can descend.

Summary of the invention

The invention provides a kind of driving method of display, it is suitable for the R-G-B view data is converted to R-G-B-Bai view data.

The present invention proposes a kind of driving method of display, it is suitable for driving a display with red time pixel, green time pixel, blue sub-pixels and white time pixel, when importing a R-G-B view data to display, display can show a maximum gamut, and the driving method of display prior to display in the maximum gamut that can show, a selected target color gamut.Then, the R-G-B view data is converted to one R-G-B-Bai view data, so that display can the display-object colour gamut.Afterwards, R-G-B-Bai view data is inputed to display, with driving display.

In one embodiment of this invention, above-mentioned target color gamut is less than maximum gamut.

In one embodiment of this invention, the method that the R-G-B view data is converted to R-G-B-Bai view data comprises: hot-green-when the blue images data only comprise the data of single pure color, according to R-G-B view data and target color gamut, calculate a high-high brightness LW of white time pixel _Max, and order white time pixel shows a default brightness LW _Default, wherein default brightness LW _DefaultLess than high-high brightness LW _MaxAnd hot-green-when the blue images data comprise the data of multiple pure color,, calculate a corresponding brightness of white time pixel according to target color gamut and different R-G-B view data, and order white time pixel shows corresponding brightness.

In one embodiment of this invention, above-mentioned default brightness LW _DefaultAnd the white time shown corresponding brightness of pixel be recorded in comparison list (Look-Up Table, LUT) in.

In one embodiment of this invention, above-mentioned high-high brightness LW _MaxIn the CIELAB space, satisfy following condition:

$\left\{\begin{array}{c}{L}_{\mathrm{threshold}}<{\mathrm{LW}}_{\max }<{\mathrm{LR}}_{\max }\\ L_{\mathrm{threshold}}<{\mathrm{LW}}_{\max }<\frac{{\mathrm{LG}}_{\max }}{2}\\ L_{\mathrm{threshold}}<{\mathrm{LW}}_{\max }<2{\mathrm{LB}}_{\max }\end{array}\right.$

Wherein, L _ThresholdBe 2, LR _MaxFor display when showing red pure color, the high-high brightness that red pixel can show, for display when showing green solid, the high-high brightness that green time pixel can show, for display when showing blue pure color, the high-high brightness that blue sub-pixels can show.

In one embodiment of this invention, above-mentioned high-high brightness LW _MaxSatisfy following condition:

$\left\{\begin{array}{c}{L}_{\mathrm{threshold}}<{\mathrm{LW}}_{\max }<{\mathrm{LR}}_{\max }\\ L_{\mathrm{threshold}}<{\mathrm{LW}}_{\max }<\frac{{\mathrm{LG}}_{\max }}{2}\\ L_{\mathrm{threshold}}<{\mathrm{LW}}_{\max }<2{\mathrm{LB}}_{\max }\end{array}\right.$

Wherein, L _ThresholdBe the brightness on the 0th rank, LR _MaxFor display when showing red pure color, the high-high brightness that red pixel can show, for display when showing green solid, the high-high brightness that green time pixel can show, for display when showing blue pure color, the high-high brightness that blue sub-pixels can show.

The driving method of display of the present invention can be sacrificed under the situation of color saturation (colorsaturation) on little amplitude ground, effectively promotes brightness of image (brightness), and improves the discontinuous situation of display image.

For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.

Description of drawings

Fig. 1 is the schematic flow sheet of driving method of the display of one embodiment of the invention;

Fig. 2 is the schematic flow sheet of driving method of the display of another embodiment of the present invention.

Main description of reference numerals:

S100: determine the maximum gamut that display can show

S110: display in the maximum gamut that can show, a selected target color gamut

S120: the R-G-B view data is converted to one R-G-B-Bai view data, so that display can the display-object colour gamut

S130: R-G-B-Bai view data is inputed to display, with driving display

S122: hot-green-as when the blue images data only comprise the data of single pure color,, to calculate a high-high brightness LW of white time pixel according to R-G-B view data and target color gamut _Max, and order white time pixel shows a default brightness LW _Default, wherein default brightness LW _DefaultLess than high-high brightness LW _Max

S124: hot-green-as when the blue images data comprise the data of multiple pure color,, to calculate a corresponding brightness of white time pixel according to target color gamut and different R-G-B view data, and order white time pixel shows corresponding brightness

Embodiment

Fig. 1 is the schematic flow sheet of driving method of the display of one embodiment of the invention.Please refer to Fig. 1, the driving method of the display of present embodiment is suitable for driving a display with red time pixel, green time pixel, blue sub-pixels and white time pixel, when importing a R-G-B view data to display, display can show a maximum gamut.At this moment, just display the maximum gamut that can show obtain to determine, as step S100.Determining maximum gamut (shown in step S100) that display can show afterwards, follow in display in the maximum gamut that can show, select a target color gamut, as step S110.Afterwards, the R-G-B view data is converted to one R-G-B-Bai view data, so that display can the display-object colour gamut, as step S120.At last, again R-G-B-Bai view data is inputed to display, with driving display, as step S130.

In step S100, step S110 and step S120, display the maximum gamut and the target color gamut that can show mainly be to decide by color filter film that is adopted and backlight.In the present embodiment, in order to allow the shown image of display have high color saturation, and being not easy to be observed the discontinuous situation of image by the user takes place, can adopt the higher color filter film of color saturation, so that display can show maximum gamut (for example being NTSC108%) when being driven by the R-G-B view data, and make display when being driven by R-G-B-Bai view data, can display-object colour gamut (for example NTSC90%, NTSC72% or NTSC50%).In other words, if adopt the higher color filter film (for example being NTSC108%) of color saturation, even the red time pixel in the display, green time pixel or blue sub-pixels are when carrying out the demonstration of image frame, though the unlatching of white time pixel can make the target color gamut of display less than maximum gamut, but the target color gamut of display still can maintain good level (for example NTSC90%, NTSC72% or NTSC50%), can satisfy product specification equally.

It should be noted that, in the present embodiment, no matter whether the R-G-B view data only comprises the data (for example: the R-G-B view data only comprises red image data, green image data or blue image data) of single pure color, present embodiment all can be opened white time pixel, and control the penetrance (i.e. the white time shown brightness of pixel) of white time pixel according to shown view data, so that the shown image that goes out of display does not have the on the low side or discontinuous situation generation of color saturation.

The shown brightness of white time pixel must be shown with other times pixel the brightness coupling, the shown brightness of white time pixel is too high or too low all to have its shortcoming to exist.In detail, the shown brightness of white time pixel is high more, and then the target color gamut of display is just low more, but display is difficult for being observed the discontinuous phenomenon of image by the user; Otherwise the shown brightness of white time pixel is low more, and then the target color gamut of display is just high more, but display is easier to be observed the discontinuous phenomenon of image by the user.Clearly, when the shown brightness of decision white time pixel, must the brightness that other times pixel is shown include consideration in, the present invention proposes a kind of method that the R-G-B view data is converted to R-G-B-Bai view data in following embodiment, right the method only is in order to illustrating, and it is not in order to limit the present invention.

Fig. 2 is the schematic flow sheet of driving method of the display of another embodiment of the present invention.Please refer to Fig. 2, in the present embodiment, the method that the R-G-B view data is converted to R-G-B-Bai view data comprises following two kinds of situations at least.When hot-green-blue images data only comprise the data of single pure color (for example: the R-G-B view data only comprises red image data, green image data or blue image data), can calculate a high-high brightness LW of white time pixel according to R-G-B view data and target color gamut _Max, and order white time pixel shows a default brightness LW _Default, wherein default brightness LW _DefaultLess than high-high brightness LW _Max(S122).When hot-green-blue images data comprise the data of multiple pure color (for example: the R-G-B view data not only comprises red image data, green image data or blue image data), according to target color gamut and different R-G-B view data, calculate a corresponding brightness of white time pixel, and order white time pixel shows corresponding brightness (S124).What deserves to be mentioned is that shown each corresponding brightness of white time pixel is all less than default brightness LW _DefaultIn addition, above-mentioned default brightness LW _DefaultAnd white time each shown corresponding brightness of pixel all be recorded in comparison list (Look-Up Table, LUT) in.

In a preferred embodiment of the present invention, above-mentioned high-high brightness LW _MaxIn the CIELAB space, satisfy following condition:

$\left\{\begin{array}{c}{L}_{\mathrm{threshold}}<{\mathrm{LW}}_{\max }<{\mathrm{LR}}_{\max }\\ L_{\mathrm{threshold}}<{\mathrm{LW}}_{\max }<\frac{{\mathrm{LG}}_{\max }}{2}\\ L_{\mathrm{threshold}}<{\mathrm{LW}}_{\max }<2{\mathrm{LB}}_{\max }\end{array}\right.$

Wherein, L _ThresholdBe 2, LR _MaxFor display when showing red pure color, the high-high brightness that red time pixel can show, LG _MaxFor display when showing green solid, the high-high brightness that green time pixel can show, LB _MaxFor display when showing blue pure color, the high-high brightness that blue sub-pixels can show.

In another preferred embodiment of the present invention, above-mentioned high-high brightness LW _MaxSatisfy following condition:

$\left\{\begin{array}{c}{L}_{\mathrm{threshold}}<{\mathrm{LW}}_{\max }<{\mathrm{LR}}_{\max }\\ L_{\mathrm{threshold}}<{\mathrm{LW}}_{\max }<\frac{{\mathrm{LG}}_{\max }}{2}\\ L_{\mathrm{threshold}}<{\mathrm{LW}}_{\max }<2{\mathrm{LB}}_{\max }\end{array}\right.$

Wherein, L _ThresholdBe the brightness on the 0th rank, LR _MaxFor display when showing red pure color, the high-high brightness that red time pixel can show, LG _MaxFor display when showing green solid, the high-high brightness that green time pixel can show, LB _MaxFor display when showing blue pure color, the high-high brightness that blue sub-pixels can show.

Because the target color gamut that the present invention shows display institute desire is when one of factor of the brightness of the white time pixel of making decision, therefore driving method of the present invention can taken into account under the prerequisite of color saturation, improves the discontinuous phenomenon of image fully.

Though the present invention with preferred embodiment openly as above; right its is not in order to limit the present invention; any those of ordinary skills; without departing from the spirit and scope of the present invention; when can doing a little change and modification, so protection scope of the present invention is as the criterion when looking the scope that claim defined of enclosing.

Claims (6)

1. the driving method of a display, be suitable for driving a display with red time pixel, green time pixel, blue sub-pixels and white time pixel, when importing a R-G-B view data to this display, this display can show a maximum gamut, and the driving method of this display comprises:

This display in this maximum gamut that can show, a selected target color gamut;

This display this R-G-B view data is converted to one R-G-B-Bai view data, so that can show this target color gamut; And

This R-G-B-Bai view data is inputed to this display,, wherein the conversion of described view data is made the shown brightness of the white time pixel of described display and red, green and the shown brightness coupling of blue sub-pixels to drive this display.

2. the driving method of display as claimed in claim 1, wherein this target color gamut is less than this maximum gamut.

3. the driving method of display as claimed in claim 1, the method that wherein this R-G-B view data is converted to this R-G-B-Bai view data comprises:

When this R-G-B view data only comprises the data of single pure color,, calculate a high-high brightness LW of this white time pixel according to this R-G-B view data and this target color gamut _Max, and make this white time pixel show a default brightness LW _Default, wherein should default brightness LW _DefaultLess than this high-high brightness LW _MaxAnd

When this R-G-B view data comprises the data of multiple pure color, according to this target color gamut and this R-G-B view data, calculate a corresponding brightness of this white time pixel, and make this white time pixel show this corresponding brightness.

4. the driving method of display as claimed in claim 3, wherein a plurality of described default brightness LW _DefaultAnd should the white time shown a plurality of described corresponding brightness of pixel be to be recorded in the comparison list.

5. the driving method of display as claimed in claim 3, wherein this high-high brightness LW _MaxIn the CIELAB space, satisfy following condition:

$\left\{\begin{array}{c}{L}_{\mathrm{threshold}}<{\mathrm{LW}}_{\max }<{\mathrm{LR}}_{\max }\\ L_{\mathrm{threshold}}<{\mathrm{LW}}_{\max }<\frac{{\mathrm{LG}}_{\max }}{2}\\ L_{\mathrm{threshold}}<{\mathrm{LW}}_{\max }<{2\mathrm{LB}}_{\max }\end{array}\right.$

Wherein, L _ThresholdBe 2, LR _MaxFor this display when showing red pure color, the high-high brightness that this redness time pixel can show, LG _MaxFor this display when showing green solid, the high-high brightness that this green time pixel can show, LB _MaxFor this display when showing blue pure color, the high-high brightness that this blue sub-pixels can show.

6. the driving method of display as claimed in claim 3, wherein this high-high brightness LW _MaxSatisfy following condition:

$\left\{\begin{array}{c}{L}_{\mathrm{threshold}}<{\mathrm{LW}}_{\max }<{\mathrm{LR}}_{\max }\\ L_{\mathrm{threshold}}<{\mathrm{LW}}_{\max }<\frac{{\mathrm{LG}}_{\max }}{2}\\ L_{\mathrm{threshold}}<{\mathrm{LW}}_{\max }<{2\mathrm{LB}}_{\max }\end{array}\right.$

Wherein, L _ThresholdBe the brightness on the 0th rank, LR _MaxFor this display when showing red pure color, the high-high brightness that this redness time pixel can show, LG _MaxFor this display when showing green solid, the high-high brightness that this green time pixel can show, LB _MaxFor this display when showing blue pure color, the high-high brightness that this blue sub-pixels can show.

Images