DISPLAY METHOD AND APPARATUS HAVING A DISPLAY PANEL WITH A BACKLIGHT UNIT UTILIZING WHITE AND BLUE LIGHT SOURCES

• US 20130342589A1
• Filed: 06/20/2013
• Published: 12/26/2013
• Est. Priority Date: 06/20/2012
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: JUNG, Jong-hoon, CHO, Seong-phil, KIM, Dae-sik, LEE, Ho-seop
• Granted Patent: US 9,558,691 B2
• Time in Patent Office: Days
• US Class Current: 345/690
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2310/0235 Field-sequential colour display
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 3/32 semiconductive, e.g. using light-emitting diodes [LED]
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix

Abstract

A display apparatus is disclosed. The display apparatus includes a panel unit which comprises a plurality of sub pixels having different colors; a backlight unit which provides backlight to the panel unit using a white light source and a blue light source; an image processing unit which converts image data into first color frame data and second color frame data; a panel driving unit which turns on a first color sub pixel according to the first color frame data, and which turns on a second color sub pixel according to the second color frame data; a backlight driving unit for driving the backlight unit; and a control unit which controls the backlight driving unit to consecutively turn on the white light source and the blue light source according to operations of the panel driving unit. Accordingly, brightness may be enhanced.

Claims

1. A display apparatus comprising:

a panel which comprises a plurality of sub pixels having different colors;

a backlight which provides backlight to the panel using a white light source and blue light source;

an image processor which converts image data into first color frame data and second color frame data;

a panel driver which turns on a first color sub pixel according to the first color frame data, and which turns on a second color sub pixel according to the second color frame data;

a backlight driver which drives the backlight; and

a controller which controls the backlight driver to consecutively turn on the white light source and the blue light source according to operations of the panel driver.

2. The display apparatus according to claim 1, wherein the backlight driver turns on the white light source for a predetermined period of time when the first color frame data is scanned on the panel, and turns on the blue light source for a predetermined period of time when the second color frame data is scanned on the panel.

3. The display apparatus according to claim 1, wherein the backlight driver turns on the white light source for a predetermined period of time when the first color frame data is scanned on the panel, and turns on the white light source and the blue light source for a predetermined period of time when the second color frame data is scanned on the panel.

4. The display apparatus according to claim 1, wherein the backlight driver keeps the white light source turned on, and turns on the blue light source for a predetermined period of time when the second color frame data is scanned on the panel.

5. The display apparatus according to claim 4, wherein the backlight driver adjusts a duty of a driving signal provided to the white light source for the time needed to reduce a level of white light provided from the white light source.

6. The display apparatus according to claim 1, wherein the plurality of sub pixels include a red sub pixel, a green sub pixel, and a white sub pixel.

7. The display apparatus according to claim 1, wherein the blue light source is a plurality of blue LEDs,

the white light source is a plurality of white LEDs where a fluorescent substance is combined on a blue LED, and

each of the blue LEDs and white LEDs is accumulated as one LED chip.

8. The display apparatus according to claim 1, wherein the blue light source is a plurality of blue LED chips,

the white light source is a plurality of white LED chips where a fluorescent substance is combined on a blue LED, and

each of the blue LED chips and white LED chips is arranged side by side.

9. A display panel comprising:

a panel which comprises a plurality of sub pixels having different colors; and

a backlight which uses a white light source and a blue light source to provide backlight to the panel.

10. The display panel according to claim 9, wherein the pixel is one of an R, G, W sub pixel combination, an R, C, W sub pixel combination, an M, C, W sub pixel combination, and an M, C sub pixel combination.

11. The display panel according to claim 9, wherein the blue light source is a plurality of LEDs,

the white light source is a plurality of white LEDs where a fluorescent substance is combined on an LED which radiates blue light, and

each of the blue LEDs and white LEDs is accumulated as one LED chip.

12. A backlight unit comprising:

a plurality of blue LEDs; and

a plurality of white LEDs,

wherein the white LED includes a fluorescent substance combined on an LED which radiates blue light, and

each of the blue LEDs and white LEDs is accumulated as one LED chip.

13. A method of displaying colors of a display apparatus, the method of displaying colors comprising:

converting image data into first color frame data and second color frame data;

panel driving which applies a driving signal to a panel which comprises a plurality of sub pixels, and consecutively turns on a first color sub pixel which corresponds to the first color frame data and a second color sub pixel which corresponds to the second color frame data; and

backlight driving which provides a backlight driving signal to a backlight which comprises a white light source and a blue light source, and selectively turns on the white light source and blue light source according to a driving state of the panel.

14. The method of displaying colors according to claim 13, wherein the backlight driving turns on the white light source for a predetermined period of time when the first color frame data is scanned on the panel, and turns on the blue light source for a predetermined of time when the second color frame data is scanned on the panel.

15. The method of displaying colors according to claim 13, wherein the backlight driving turns on the white light source for a predetermined period of time when the first color frame data is scanned on the panel, and turns on the white light source and blue light source together for a predetermined period of time when the second color frame data is scanned on the panel.

16. The method of displaying colors according to claim 13, wherein the backlight driving keeps the white light source turned on, and turns on the blue light source for a predetermined period of time when the second color frame data is scanned on the panel.

17. The method of displaying colors according to claim 16, wherein the backlight driving adjusts a duty of a driving signal provided to the white light source for a predetermined period of time to reduce a level of white light provided from the white light source.

18. The method of displaying colors according to claim 13, wherein the plurality of sub pixels include a red sub pixel, a green sub pixel, and a white sub pixel.

19. The method of displaying colors according to claim 13, wherein the blue light source is a plurality of blue LEDs,

the white light source is a plurality of white LEDs where a fluorescent substance is combined on a blue LED, and

each of the blue LEDs and white LEDs is accumulated as one LED chip.

20. A transparent display system comprising:

a transparent panel;

at least one white light source which is arranged on one side of the transparent panel and provides white light to the transparent panel; and

at least one blue light source which is arranged on one side of the transparent panel and provides blue light to the transparent panel,

wherein

the transparent panel comprises a color filter layer which is divided into at least one color filter region and at least one transparent filter region, and

the at least one color filter region locally includes a transparent region.

28. The transparent display system of claim 20 further comprising:

the at least color filter region includes red, green and white sub pixels, wherein a transparent region of the white sub pixel is larger than a transparent region for the red and green sub pixels, whereby transparency is improved.

21. A display apparatus comprising:

a display panel which includes a panel having a sub pixel structure including sub pixels of different colors, and a backlight which uses a white light source and blue light source;

an image processor which provides first color frame data and second color frame data;

wherein the display panel turns on a first color sub pixel according to the first color frame data, and which turns on a second color sub pixel according to the second color frame data; and

a controller which consecutively turns on the white light source and the blue light source.

22. The display apparatus according to claim 21, further comprising:

the sub pixels of different colors include at least one white sub pixel, wherein the white sub pixel together with the blue light source increases the brightness of the sub pixel structure.

23. The display apparatus of claim 22, further comprising:

the white light source has a first blue LED and a second blue LED;

each of the first and second blue LEDs is electrically connected to a substrate.

24. The display apparatus of claim 23 further comprising:

a fluorescent substance is combined on one of the blue LEDs, and

each of the blue LEDs and white LEDs is accumulated as one LED chip.

25. The display apparatus of claim 21, further comprising:

the backlight includes a backlight driver which adjusts a driving signal provided to the white light source for the time needed to reduce a level of the white light.

26. The display apparatus of claim 25, further comprising:

the panel includes a panel driver which performs the turning on of the first color sub pixel according to the first color frame data, and which turns on the second color sub pixel according to the second color frame data.

27. The display apparatus of claim 21, wherein the plurality of sub pixels include a red sub pixel, a green sub pixel, and a white sub pixel.