A TUNABLE BACKLIGHT DEVICE, A DISPLAY DEVICE AND A METHOD OF DRIVING THE SAME

• US 20160358556A1
• Filed: 08/11/2015
• Published: 12/08/2016
• Est. Priority Date: 02/13/2015
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd., Hefei BOE Optoelectronics Technology Company Limited (BOE Technology Group Co., Ltd.)
• Original Assignee: BOE Technology Group Co., Ltd., Hefei BOE Optoelectronics Technology Company Limited (BOE Technology Group Co., Ltd.)
• Inventors: Zhan, Jianghui, Fang, Ming, Jinmoo, Park, LV, Chang, Chen, Shounian
• Granted Patent: US 10,210,819 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2320/08 Arrangements within a display terminal for setting, manually or automatically, display parameters of the display terminal
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

The present disclosure provides a tunable backlight device, a display device and method of driving the display device. The tunable backlight device comprises: at least one backlight apparatus with high color gamut and low luminance; at least one backlight apparatus with low color gamut and high luminance; a storage configured to store a library of current feedback coefficients; a current feedback apparatus, configured to determine a first current feedback coefficient (K1) for the backlight apparatus with high color gamut and low luminance and a second current feedback coefficient (K2) for the backlight apparatus with low color gamut and high luminance, according to the requirements, respectively; a backlight driving apparatus configured to supply respective currents to both the backlight apparatuses to emit lights, based on the first and the second current feedback coefficients, respectively; and a light guide plate configured to mix the lights emitted from the both backlight apparatuses.

Claims

1. A tunable backlight device, comprising:

at least one backlight apparatus with high color gamut and low luminance;

at least one backlight apparatus with low color gamut and high luminance;

a storage, configured to store a library of current feedback coefficients;

a current feedback apparatus configured to determine a first current feedback coefficient (K1) for the backlight apparatus with high color gamut and low luminance, and a second current feedback coefficient (K2) for the backlight apparatus with low color gamut and high luminance, from the library of current feedback coefficients, respectively, according to requirements on chromaticity and luminance;

a backlight driving apparatus configured to supply currents to the backlight apparatus with high color gamut and low luminance and the backlight apparatus with low color gamut and high luminance to enable light emission, based on the first and the second current feedback coefficients, respectively; and

a light guide plate configured to mix the lights emitted from the backlight apparatus with high color gamut and low luminance and the lights emitted from the backlight apparatus with low color gamut and high luminance.

2. The tunable backlight device of claim 1, further comprising performing a plurality of tests on the backlight apparatus with high color gamut and low luminance or the backlight apparatus with low color gamut and high luminance in advance, to obtain a relationship between the luminance and/or the color gamut under different current intensities and the current as the library of current feedback coefficients;

storing the library of current feedback coefficients in the storage; and

retrieving feedback coefficients from the library of current feedback coefficient according the desired requirements on the luminance or chromaticity.

3. The tunable backlight device of claim 1, wherein a light source provided in the backlight apparatus with high color gamut and low luminance and a light source provided in the backlight apparatus with low color gamut and high luminance is the same light-emitting diode.

4. The tunable backlight device of claim 1, wherein a light source provided in the backlight apparatus with high color gamut and low luminance and a light source provided the backlight apparatus with low color gamut and high luminance are different light-emitting diodes.

5. The tunable backlight device of claim 1, wherein the requirements on the color gamut and the luminance are inputted by a user.

6. The tunable backlight device of claim 1, wherein the requirements on the chromaticity and luminance for a preset scene are stored in advance.

7. The tunable backlight device of claim 6, wherein the storage is configured to store different current feedback coefficients for different preset scenes.

8. The tunable backlight device of claim 1, wherein the first current feedback coefficient and the second current feedback coefficient are within a range of 0-1.

9. The tunable backlight device of claim 8, wherein when a total input power is a constant, a sum of the first current feedback coefficient and the second current feedback coefficient is equal to 1 (K1+K2=1).

10. The tunable backlight device of claim 8, wherein when a total input power is increased, a sum of the first current feedback coefficient and the second current feedback coefficient is greater than 1 (K1+K2>

1).

11. The tunable backlight device of claim 1, wherein a range of the color gamut is from 56.7% to 72%.

12. The tunable backlight device of claim 1, wherein a range of the luminance is from 455 nit to 579 nit.

13. The tunable backlight device of claim 1, wherein the currents supplied for the backlight apparatus with high color gamut and low luminance and the backlight apparatus with low color gamut and high luminance correspond to products of a normal driving current by the first and the second current feedback coefficients, respectively.

14. A display device, comprising:

the tunable backlight device of claim 1; and

an input unit configured to input requirements on chromaticity and luminance.

15. A method of driving a tunable backlight device, comprising:

receiving requirements on chromaticity and luminance;

generating a first current feedback coefficient (K1) to a backlight apparatus with high color gamut and low luminance, and a second current feedback coefficient (K2) to a backlight apparatus with low color gamut and high luminance respectively, based on the requirements on chromaticity and luminance;

supplying currents to the backlight apparatus with high color gamut and low luminance and the backlight apparatus with low color gamut and high luminance to emit lights, based on the first and the second current feedback coefficients, respectively; and

mixing the lights emitted from the backlight apparatus with high color gamut and low luminance and the lights emitted the backlight apparatus with low color gamut and high luminance by a light guide plate.

16. A method of driving a tunable backlight device, comprising:

acquiring a preset scene to be displayed;

providing a first current feedback coefficient (K1) to a backlight apparatus with high color gamut and low luminance, and second current feedback coefficient (K2) to a backlight apparatus with low color gamut and high luminance respectively, based on the preset scene;

supplying respective currents to the backlight apparatus with high color gamut and low luminance and the backlight apparatus with low color gamut and high luminance to emit lights, based on the first and the second current feedback coefficients, respectively; and

mixing the lights emitted from the backlight apparatus with high color gamut and low luminance and the lights emitted from the backlight apparatus with low color gamut and high luminance by a light guide plate.