Display method and apparatus having a display panel with a backlight unit utilizing white and blue light sources

• US 9,558,691 B2
• Filed: 06/20/2013
• Issued: 01/31/2017
• 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
• Primary Examiner(s): Park, Sanghyuk
• Application Number:
  US13/922,550
• Publication Number:
  US 20130342589A1
• Time in Patent Office: 1,321 Days
• US Class Current: 1/1
• 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 comprising a plurality of sub pixels having different colors;

a backlight configured to provide a backlight to the panel only using a white light source and a blue light source;

an image processor configured to convert image data into first color frame data and second color frame data, the first color frame data being of one among a red color, a green color, and a white color, and the second color frame data being of a blue color;

a panel driver configured to turn on a first color sub pixel according to the first color frame data, and turn on a second color sub pixel according to the second color frame data, the first color sub pixel being of one among the red color, the green color, and the white color, and the second color sub pixel being of the white color;

a backlight driver configured to drive the backlight; and

a controller configured to control the backlight driver to turn on the white light source according to the first color frame data in response to the panel driver turning on the first color sub pixel, and turn on the blue light source according to the second color frame data in response to the panel driver turning on the second color sub pixel.

2. The display apparatus according to claim 1, wherein the backlight driver is configured to turn on the white light source for a predetermined period of time in response to the first color frame data being scanned on the panel, and turn on the blue light source for a predetermined period of time in response to the second color frame data being 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, each of the plurality of white LEDs comprising a fluorescent substance disposed 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. The display apparatus according to claim 1, wherein the panel driver is further configured to turn off the second color sub pixel according to the first color frame data, and turn off the first color sub pixel according to the second color frame data.

10. The display apparatus according to claim 1, wherein the controller is further configured to control the backlight driver to turn off the blue light source according to the first color frame data in response to the panel driver turning on the first color sub pixel, and turn off the white light source according to the second color frame data in response to the panel driver turning on the second color sub pixel.

11. A display panel comprising:

a panel comprising a plurality of sub pixels having different colors;

a backlight configured to provide a backlight to the panel only using a white light source and a blue light source;

a panel driver configured to turn on a first color sub pixel according to first color frame data of one among a red color, a green color, a white color, a magenta color, and a cyan color, and turn on a second color sub pixel according to second color frame data of a blue color, the first color sub pixel being of one among the red color, the green color, the white color, the magenta color, and the cyan color, and the second color sub pixel being of one among the white color, the magenta color, and the cyan color; and

a controller configured to control the backlight to turn on the white light source according to the first color frame data in response to the panel driver turning on the first color sub pixel, and turn on the blue light source according to the second color frame data in response to the panel driver turning on the second color sub pixel.

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

the white light source is a plurality of white LEDs, each of the plurality of white LEDs comprising a fluorescent substance disposed on a blue LED, 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, the first color frame data being of one among a red color, a green color, and a white color, and the second color frame data being of a blue color;

panel driving a driving signal to a panel comprising a plurality of sub pixels, the panel driving comprising turning on a first color sub pixel according to the first color frame data, and turning on a second color sub pixel according to the second color frame data, the first color sub pixel being of one among the red color, the green color, and the white color, and the second color sub pixel being of the white color; and

backlight driving a backlight driving signal to a backlight only using a white light source and a blue light source, the backlight driving comprising turning on the white light source according to the first color frame data in response to the turning on the first color sub pixel, and turning on the blue light source according to the second color frame data in response to the turning on the second color sub pixel.

14. The method of displaying colors according to claim 13, wherein the backlight driving comprises turning on the white light source for a predetermined period of time in response to the first color frame data being scanned on the panel, and turning on the blue light source for a predetermined of time in response to the second color frame data being 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, each of the plurality of white LEDs comprising a fluorescent substance disposed 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;

a backlight only using at least one white light source and at least one blue light source, the at least one white light source being arranged on a side of the transparent panel, the at least one white light source configured to provide white light to the transparent panel, and the least one blue light source being arranged on a side of the transparent panel, the at least one blue light source configured to provide blue light to the transparent panel,

wherein the transparent panel comprises a color filter layer that 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;

a panel driver configured to turn on the at least one color filter region according to first color frame data of one among a red color, a green color, a white color, a magenta color, and a cyan color, and turn on the at least one transparent filter region according to second color frame data of a blue color; and

a controller configured to turn on the at least one white light source according to the first color frame data in response to the panel driver turning on the at least one color filter region, and turn on the at least one blue light source according to the second color frame data in response to the panel driver turning on the at least one transparent filter region.

21. A display apparatus comprising:

a panel comprising sub pixels of different colors;

a backlight only using a white light source and blue light source;

an image processor configured to provide first color frame data and second color frame data, the first color frame data being of one among a red color, a green color, a white color, a magenta color, and a cyan color, and the second color frame data being of a blue color,

wherein the panel is configured to turn on a first color sub pixel according to the first color frame data, and turn on a second color sub pixel according to the second color frame data, the first color sub pixel being of one among the red color, the green color, the white color, the magenta color, and the cyan color, and the second color sub pixel being of one among the white color, the magenta color, and the cyan color; and

a controller configured to turn on the white light source according to the first color frame data in response to the panel turning on the first color sub pixel, and turn on the blue light source according to the second color frame data in response to the panel turning on the second color sub pixel.

22. The display apparatus according to claim 21, wherein the sub pixels of different colors include at least one white sub pixel.

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.