Method and device for adjusting colour temperature

Patent metadata

Field	Value
Publication number	US-2016284284-A1
Application number	US-201615078669-A
Country	US
Kind code	A1
Filing date	Mar 23, 2016
Priority date	Mar 24, 2015
Publication date	Sep 29, 2016
Grant date	—

Abstract

A method and a device for adjusting a colour temperature are disclosed. The method includes acquiring a colour coordinate value of a pixel in a Liquid Crystal Display (LCD) is acquired when the LCD displays a white screen, determining whether the colour coordinate value is within a predetermined colour coordinate range corresponding to a predetermined colour temperature of the LCD, and adjusting, if the colour coordinate value is not within the predetermined colour coordinate range, a component value of at least one LED of N LEDs corresponding to the pixel until a changed colour coordinate value of the pixel due to the adjustment falls within the predetermined colour coordinate range.

First claim

What is claimed is:

1 . A method for adjusting a colour temperature of a liquid crystal display (LCD), comprising:
acquiring a colour coordinate value of a pixel in the LCD when the LCD displays a white screen; determining whether the colour coordinate value is within a predetermined colour coordinate range corresponding to a predetermined colour temperature of the LCD; and when the colour coordinate value is not within the predetermined colour coordinate range, adjusting a component value of at least one light emitting diode (LED) of N LEDs corresponding to the pixel until a changed colour coordinate value of the pixel due to the adjustment falls within the predetermined colour coordinate range, wherein N is a positive integer.

2 . The method according to claim 1 , wherein adjusting the component value of the at least one LED of the N LEDs corresponding to the pixel comprises:
adjusting a driving voltage value of a liquid crystal corresponding to the at least one LED of the N LEDs, wherein the driving voltage value is in a positive correlation relationship with the component value.

3 . The method according to claim 2 , wherein the LED is blue light, red light or green light, and adjusting the driving voltage value of the liquid crystal corresponding to the at least one LED of the N LEDs comprises:
determining whether a colour temperature of the pixel is higher or lower than the predetermined colour temperature based on the colour coordinate value; when the colour temperature of the pixel is higher than the predetermined colour temperature, executing at least one operation of increasing a driving voltage value of a liquid crystal corresponding to the blue light, reducing a driving voltage value of a liquid crystal corresponding to the red light and reducing a driving voltage value of a liquid crystal corresponding to the green light; and when the colour temperature of the pixel is lower than the predetermined colour temperature, executing at least one operation of reducing a driving voltage value of a liquid crystal corresponding to the blue light, increasing a driving voltage value of a liquid crystal corresponding to the red light and increasing a driving voltage value of a liquid crystal corresponding to the green light.

4 . The method according to claim 3 , wherein executing at least one operation of increasing the driving voltage value of the liquid crystal corresponding to the blue light, reducing the driving voltage value of the liquid crystal corresponding to the red light and reducing the driving voltage value of the liquid crystal corresponding to the green light comprises:
increasing the driving voltage value of the liquid crystal corresponding to the blue light; determining whether the driving voltage value of the liquid crystal corresponding to the blue light reaches a voltage limit value of the blue light; and executing at least one operation of reducing the driving voltage value of the liquid crystal corresponding to the red light and reducing the driving voltage value of the liquid crystal corresponding to the green light when the driving voltage value of the liquid crystal corresponding to the blue light reaches the voltage limit value.

5 . The method according to claim 3 , wherein executing at least one operation of reducing the driving voltage value of the liquid crystal corresponding to the blue light, increasing the driving voltage value of the liquid crystal corresponding to the red light and increasing the driving voltage value of the liquid crystal corresponding to the green light comprises:
executing at least one operation of increasing the driving voltage value of the liquid crystal corresponding to the red light and increasing the driving voltage value of the liquid crystal corresponding to the green light; determining whether the driving voltage values of the liquid crystals corresponding to the red light and the green light reach their respective voltage limit values; and reducing the driving voltage value of the liquid crystal corresponding to the blue light when the driving voltage values of the liquid crystals corresponding to the red light and the green light reach their respective voltage limit values.

6 . The method according to claim 1 , further comprising:
adjusting, based on the adjusted component value of the at least one LED, a gamma curve corresponding to the at least one LED, wherein an adjustment pattern of the gamma curve corresponds to that of the component value.

7 . The method according to claim 2 , further comprising:
adjusting, based on the adjusted component value of the at least one LED, a gamma curve corresponding to the at least one LED, wherein an adjustment pattern of the gamma curve corresponds to that of the component value.

8 . The method according to claim 3 , further comprising:
adjusting, based on the adjusted component value of the at least one LED, a gamma curve corresponding to the at least one LED, wherein an adjustment pattern of the gamma curve corresponds to that of the component value.

9 . The method according to claim 4 , further comprising:
adjusting, based on the adjusted component value of the at least one LED, a gamma curve corresponding to the at least one LED, wherein an adjustment tendency of the gamma curve corresponds to that of the component value.

10 . The method according to claim 5 , further comprising:
adjusting, according to the adjusted component value of the at least one LED, a gamma curve corresponding to the at least one LED, wherein an adjustment tendency of the gamma curve corresponds to that of the component value.

11 . A device for adjusting a colour temperature of Liquid Crystal Display (LCD), comprising:
a processor; and a memory for storing instructions executable by the processor, wherein the processor is configured to: acquire a colour coordinate value of a pixel in an LCD when the LCD displays a white screen; determine whether the colour coordinate value is within a predetermined colour coordinate range, wherein the predetermined colour coordinate range corresponding to a predetermined colour temperature of the LCD; and when the colour coordinate value is not within the predetermined colour coordinate range, adjust a component value of at least one LED of N LEDs corresponding to the pixel until a changed colour coordinate value of the pixel due to the adjustment falls within the predetermined colour coordinate range, wherein N is a positive integer.

12 . The device according to claim 11 , wherein the processor is further configured to adjust a driving voltage value of a liquid crystal corresponding to the at least one LED of the N LEDs, wherein the driving voltage value is in a positive correlation relationship with the component value.

13 . The device according to claim 12 , wherein the processor is further configured to:
determine whether a colour temperature of the pixel is higher or lower than the predetermined colour temperature based on the colour coordinate value; execute, when the colour temperature determining sub-module determines that the colour temperature of the pixel is higher than the predetermined colour temperature, at least one operation of increasing a driving voltage value of a liquid crystal corresponding to the blue light, reducing a driving voltage value of a liquid crystal corresponding to the red light and reducing a driving voltage value of a liquid crystal corresponding to the green light; and execute, when the colour temperature determining sub-module determines that the colour temperature of the pixel is lower than the predetermined colour temperature, at least one operation

Assignees

• Xiaomi Inc

Inventors

• Liu Anyu
• Li Guosheng
• Zhong Guilin

Classifications

• G09G2320/0673

  for control of gamma adjustment, e.g. selecting another gamma curve · CPC title

• G09G3/36 Primary

  using liquid crystals · CPC title

• G09G2320/0666

  for control of colour parameters, e.g. colour temperature · CPC title

• G09G3/2003 Primary

  Display of colours (specific for liquid crystal displays G09G3/3607) · CPC title

• G09G3/3413 Primary

  Details of control of colour illumination sources · CPC title