Display device and method of driving the same
View Patent ↗A display device includes a comparing portion extracting a minimum value and a maximum value of red, green, blue source image data signals, a first extracting portion extracting an intermediate signal from the minimum value and extracting a white image data signal from the intermediate signal, a second extracting portion extracting a red image data signal from the intermediate signal, the maximum data signal, and the red source image data signal, a third extracting portion extracting a green image data signal from the intermediate signal, the maximum data signal, and the green source image data signal, a fourth extracting portion extracting a blue image data signal from the intermediate signal, the maximum data signal, and the blue source image data signal, and a display panel having a plurality of pixels including red, green, blue, and white sub-pixels supplied with the red, green, blue, and white image data signals, respectively.
1. A display device, comprising:
a comparing portion extracting a minimum value and a maximum value of red, green, blue source image data signals;
a first extracting portion extracting an intermediate signal from the minimum value and extracting a white image data signal from the intermediate signal;
a second extracting portion extracting a red image data signal from the intermediate signal, the maximum data signal, and the red source image data signal;
a third extracting portion extracting a green image data signal from the intermediate signal, the maximum data signal, and the green source image data signal;
fourth extracting portion extracting a blue image data signal from the intermediate signal, the maximum data signal, and the blue source image data signal; and
display panel having a plurality of pixels including red, green, blue, and white sub-pixels supplied with the red, green, blue, and white image data signals, respectively,
wherein the first extracting portion includes a fifth extracting portion extracting the intermediate signal using a first function, W=f(MIN), wherein W is a value of the intermediate signal and MIN is the minimum value of the red, green, blue source image data signals, and the a sixth extracting portion extracting the white image data signal using a second function, Wo=f(W), wherein Wo is a value of the white image data signal and W is a value of the intermediate signal.
2. The device according to claim 1 , wherein the first function is W=MIN k , wherein k is a real number.
3. The device according to claim 1 , wherein the second function is Wo=(TP)(W/W(TP)) 1/γ , when 0≦W≦TP, wherein TP is an upper limit of a gray level, γ is a gamma factor, W(TP) is a function value at TP, and GLM is a maximum gray level.
4. The device according to claim 1 , wherein the second function is Wo=W when TP<W≦GLM, wherein TP is an upper limit of a gray level, and GLM is a maximum gray level.
5. The device according to claim 1 , wherein the fifth extracting portion uses a first look-up table in accordance with the first function, and the sixth extracting portion uses a second look-up table in accordance with the second function.
6. The device according to claim 1 , wherein the second extracting portion extracts the red image data signal using an expression, Ro=Ri*(W+MAX)/MAX−W, wherein Ri is a value of the red source image data signal, Ro is a value of the red image data signal, W is a value of the intermediate signal, and MAX is the maximum value of the red, green, and blue source image data signals.
7. The device according to claim 1 , wherein the third extracting portion extracts the green image data signal using an expression, Go=Gi*(W+MAX)/MAX−W, wherein Gi is a value of the green source image data signal, Go is a value of the green image data signal, W is a value of the intermediate signal, and MAX is the maximum value of the red, green, and blue image data signals.
8. The device according to claim 1 , wherein the fourth extracting portion extracts the blue image data signal using an expression, Bo=Bi*(W+MAX)/MAX−W, wherein Bi is a value of the blue source image data signal, Bo is a value of the blue image data signal, W is a value of the intermediate signal, and MAX is the maximum value of the red, green, and blue source image data signals.
9. The device according to claim 1 , further comprises a timing controller to output the red, green, blue, and white image data signals in accordance with a timing sequence.
10. The device according to claim 9 , further comprises a plurality of data drivers supplying the red, green, blue, and white image data signals to the red, green, blue, and white sub-pixels, respectively.
11. The device according to claim 1 , wherein the display panel is a liquid crystal display panel.
12. A method of driving a display device, comprising:
extracting a minimum value and a maximum value of red, green, blue source image data signals;
extracting an intermediate signal from the minimum value;
extracting a white image data signal from the intermediate signal;
extracting a red image data signal from the intermediate signal, the maximum data signal, and the red source image data signal;
extracting a green image data signal from the intermediate signal, the maximum data signal, and the green source image data signal;
extracting a blue image data signal from the intermediate signal, the maximum data signal, and the blue source image data signal; and
supplying the red, green, blue, and white image data signals to a plurality of pixels each including red, green, blue, and white sub-pixels to display images on a display of the display devices,
wherein the intermediate signal is extracted using a first function, W=f(MIN), wherein W is a value of the intermediate signal. and MIN is the minimum value of the red, green, blue source image data signals, and the white image data signal is extracted using a second function, Wo=f(W). wherein Wo is a value of the white image data signal.
13. The method according to claim 12 , wherein the first function is W=MIN k , wherein k is a real number.
14. The method according to claim 12 , wherein the second function is Wo=(TP)(W/W(TP)) 1/γ , when 0≦W≦TP wherein TP is an upper limit of a gray level, γ is a gamma factor, and W(TP) is a function value at TP.
15. The method according to claim 12 , wherein the second function is Wo=W when TP<W≦GLM, wherein TP is an upper limit of a gray level, GLM is a maximum gray level.
16. The method according to claim 12 , wherein the intermediate signal is extracted using a first look-up table in accordance with the first function, and the white image data signal is extracted using a second look-up table in accordance with the second function.
17. The method according to claim 12 , wherein the red image data signal is extracted using an expression, Ro=Ri*(W+MAX)/MAX−W, wherein Ri is a value of the red source mage data signal, Ro is a value of the red image data signal, W is a value of the intermediate signal, and MAX is the maximum value of the red, green, blue source image data signals.
18. The method according to claim 12 , wherein the green image data signal is extracted using an expression, Go=Gi*(W+MAX)/MAX−W, wherein Gi is a value of the green source image data signal, Go is a value of the green image data signal, W is a value of the intermediate signal, and MAX is the maximum value of the red, green, blue source image data signals.
19. The method according to claim 12 , wherein the blue image data signal is extracted using an expression, Bo=Bi*(W+MAX)/MAX−W, wherein Bi is a value of the blue source image data signal, Bo is a value of the blue image data signal, W is a value of the intermediate signal, and MAX is the maximum value of the red, green, blue source image data signals.
20. The method according to claim 12 , wherein supplying the red, green, blue, and white image data signals includes a sequential timing.
21. The method according to claim 12 , wherein the display panel is a liquid crystal display panel.
22. A display device, comprising:
a comparing portion extracting a minimum value and a maximum value of red, green, blue source image data signals;
a first extracting portion extracting an intermediate signal from the minimum value and extracting a white image data signal from the intermediate signal;
a second extracting portions extracting red, green, and blue image data signals from the intermediate signal, the maximum data signal, and the red, green, and blue source image data signals;
a display panel having a plurality of pixels, each of the pixels having red, green, blue, and white sub-pixels supplied with the red, green, blue, and white image data signals, respectively,
wherein the first extracting portion extracts the intermediate signal using a first function including the minimum value of the red, green, blue source image data signals, and extracts the white image data signal using a second function including the intermediate signal.
23. The device according to claim 22 , wherein the first function is W=MIN k , wherein W is a value of the intermediate signal, k is a real number and MIN is the minimum value of the red, green, blue source image data signals.
24. The device according to claim 22 , wherein the second function is Wo=(TP)(W/W(TP)) 1/γ , when 0≦W≦TP wherein Wo is a value of the white image data signal, TP is an upper limit of a gray level, γ is a gamma factor, W is a value of the intermediate signal, and W(TP) is a function value at TP.
25. The device according to claim 22 , wherein the second function is Wo=W, when TP<W≦GLM, wherein Wo is a value of the white image data signal, W is a value of the intermediate signal, TP is an upper limit of a gray level and GLM is a maximum gray level.
26. The device according to claim 22 , further comprises a timing controller to output the red, green, blue, and white image data signals in accordance with a timing sequence.
27. The device according to claim 22 , further comprises a plurality of data drivers supplying the red, green, blue, and white image data signals to the red, green, blue, and white sub-pixels, respectively.
28. The device according to claim 22 , wherein the display panel is a liquid crystal display panel.