Systems and methods for screen color temperature control using RGBW front light

Patent metadata

Field	Value
Publication number	US-10564668-B2
Application number	US-201715678734-A
Country	US
Kind code	B2
Filing date	Aug 16, 2017
Priority date	Aug 16, 2016
Publication date	Feb 18, 2020
Grant date	Feb 18, 2020

Abstract

An electronic reading device includes an adjustable RGBW front light and an ambient light sensor. Additionally, the electronic reading device includes circuitry configured to receive a signal corresponding to a brightness level from the ambient light sensor, receive a signal corresponding to a current screen color temperature, calculate a predetermined mixture of light based on at least one of the brightness level or the current screen color temperature, Wherein the calculation allows the current screen color temperature to remain the same regardless of the brightness level, and display the predetermined mixture of light via the adjustable RGBW front light.

First claim

The invention claimed is:

1. A device, comprising:
a display screen:
an adjustable RGBW front light;
an ambient light sensor; and
circuitry configured to receive a signal corresponding to a brightness level from the ambient light sensor,
receive a signal corresponding to a current screen color temperature of the display screen; determine a transition rate which corresponds to a calculation of the rate at which a brightness level changes between a low ambient light preferred brightness level to a high ambient light preferred brightness level;
calculate a predetermined mixture of light based on the brightness level and the current screen color temperature, wherein the calculation allows the current screen color temperature to remain the same regardless of the brightness level, and
display the predetermined mixture of light onto the display screen via the adjustable RGBW front light set a transition rate at which a brightness level of the display screen transitions between the low ambient light preferred brightness level and the high ambient light preferred brightness level as the ambient light changes and determine if a brightness level has changed, and automatically adjust the predetermined mixture of light to be displayed via the adjustable RGBW front light such that the screen color temperature does not change in response to the changing brightness level; and wherein the current screen color temperature automatically changes based on the time of day.

2. The device of claim 1 , wherein the predetermined mixture of light changes in response to a change in the current screen color temperature.

3. The device of claim 1 , wherein the predetermined mixture of light changes in response to a change in the brightness level.

4. The device of claim 3 , wherein the current screen color temperature does not change in response to a change in the brightness level.

5. The device of claim 1 , wherein the current screen color temperature includes 1500K to 6400K.

6. The device of claim 5 , wherein each of the current screen color temperatures has corresponding RGBW values.

7. The device of claim 5 , wherein each of the current screen color temperatures has corresponding RGBW values for each brightness level, wherein the brightness level includes 0% brightness to 100% brightness, such that every current screen color temperature has RGBW values for every brightness level.

8. The device of claim 1 , wherein the predetermined mixture of light is displayed in real time via the adjustable RGBW front light such that a change in brightness is not apparent to the user as the screen color temperature remains the same.

9. A method of screen color temperature control using an RGBW front light, comprising:
receiving a signal corresponding to a brightness level from an ambient light sensor disposed in an electronic reading device;
receiving a signal corresponding to a current screen color temperature being displayed on a display screen of the electronic reading device; determine a transition rate which corresponds to a calculation of the rate at which a brightness level changes between a low ambient light preferred brightness level to a high ambient light preferred brightness level;
calculating a predetermined mixture of light based on the brightness level and the current screen color temperature, wherein the calculation allows the current screen color temperature to remain the same regardless of the brightness level;
displaying the predetermined mixture of light onto the display screen of the electronic reading device via an adjustable RGBW front light set a transition rate at which a brightness level of the display screen transitions between the low ambient light preferred brightness level and the high ambient light preferred brightness level as the ambient light changes and determine if a brightness level has changed, and automatically adjust the predetermined mixture of light to be displayed via the adjustable RGBW front light such that the screen color temperature does not change in response to the changing brightness level; and wherein the current screen color temperature automatically changes based on the time of day.

10. The method of claim 9 , wherein the predetermined mixture of light changes in response to a change in the current screen color temperature.

11. The method of claim 9 , wherein the predetermined mixture of light changes in response to a change in the brightness level.

12. The method of claim 11 , wherein the current screen color temperature does not change in response to a change in the brightness level.

13. The method of claim 9 , wherein the current screen color temperature includes 1500K to 6400K.

14. The method of claim 13 , wherein each of the current screen color temperatures has corresponding RGBW values.

15. The method of claim 13 , wherein each of the current screen color temperatures has corresponding RGBW values for each brightness level, wherein the brightness level includes 0% brightness to 100% brightness, such that every current screen color temperature has RGBW values for every brightness level.

16. The method of claim 9 , wherein the predetermined mixture of light is displayed in real time via the adjustable RGBW front light such that a change in brightness is not apparent to the user as the screen color temperature remains the same.

Assignees

• Rakuten Kobo Inc

Inventors

• Hunter Trevor
• Clements Matt
• Talusan George
• Mcdougall Paul
• Chaban William
• Xu Zheng
• Li Steve
• Ng Thow Hing Jeffrey

Classifications

• G06F1/1698

  the I/O peripheral being a sending/receiving arrangement to establish a cordless communication link, e.g. radio or infrared link, integrated cellular phone (details of antennas disposed inside a computer H01Q1/2266) · CPC title

• H04M1/0245

  using open/close detection · CPC title

• H04M1/0279

  Improving the user comfort or ergonomics · CPC title

• H05K7/1417

  having securing means for mounting boards, plates or wiring boards (H05K7/1461 takes precedence) · CPC title

• A45C11/00

  Receptacles for purposes not provided for in groups A45C1/00-A45C9/00 (specially adapted for toiletry or cosmetic equipment A45D29/20, A45D44/18; travelling sewing kits A45F3/48) · CPC title