Systems and methods for automated screen color temperature control

Patent metadata

Field	Value
Publication number	US-10331167-B2
Application number	US-201715678671-A
Country	US
Kind code	B2
Filing date	Aug 16, 2017
Priority date	Aug 16, 2016
Publication date	Jun 25, 2019
Grant date	Jun 25, 2019

Abstract

An electronic reading device can include an adjustable RGBW front light and an ambient light sensor. Additionally, the electronic reading device can include circuitry configured to determine if a transition between phases has occurred, wherein the phases include a night phase, a sunrise transition phase, a daytime phase, and a sunset transition phase, automatically display a predetermined screen color temperature via the adjustable RGBW front light in response to the transition between phases, determine if a brightness level has changed, and automatically adjust a 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.

First claim

The invention claimed is:

1. An electronic reading device, comprising:
an adjustable RGBW front light;
an ambient light sensor; and
circuitry configured to
determine if a transition between phases has occurred, wherein the phases include a night phase, a sunrise transition phase, a daytime phase, and a sunset transition phase,
automatically display a predetermined screen color temperature via the adjustable RGBW front light in response to the transition between phases,
determine if a brightness level has changed, and
automatically adjust a 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.

2. The electronic reading device of claim 1 , wherein the night phase is from a bedtime to a predetermined sunrise, the bedtime being a default setting or manually selected by a user.

3. The electronic reading device of claim 2 , wherein the predetermined sunrise includes a manually selected time of day, a default setting, or an automatically adjusted setting corresponding to the time of sunrise changing throughout a year.

4. The electronic reading device of claim 2 , wherein the predetermined screen color temperature of the night phase is 1900K.

5. The electronic reading device of claim 1 , wherein the sunrise transition phase is from the predetermined sunrise to the start of the daytime phase such that the predetermined screen color temperature transitions from 1900K at the beginning of the sunrise transition phase to 6400K at the beginning of the daytime phase.

6. The electronic reading device of claim 1 , wherein the daytime phase is from a predetermined beginning of the daytime phase to a predetermined beginning of the sunset transition phase.

7. The electronic reading device of claim 1 , wherein the sunset transition phase is from a predetermined beginning of the sunset transition phase to the bedtime, wherein the bedtime is the beginning of the night phase, such that the predetermined screen color temperature transitions from 6400K at the beginning of the sunset transition phase to 1900K at the bedtime.

8. The electronic reading device of claim 1 , wherein the circuitry is further configured to
determine if a current phase is the sunrise transition phase,
automatically increase the screen color temperature at a first predetermined rate of change,
determine if the current phase is the sunset transition phase, and
automatically decrease the screen color temperature at a second predetermined rate of change.

9. The electronic reading device of claim 1 , wherein the circuitry is further configured to
receive the bedtime corresponding to the beginning of the night phase,
determine if the screen color temperature is manually adjusted during the sunset transition phase,
determine if the screen color temperature is manually increased within one hour of the selected bedtime,
delay the selected bedtime by one hour when the screen color temperature is manually increased within one hour of the selected bedtime,
determine if the screen color temperature is manually decreased during the sunset transition, and
continue the transition in the sunset transition from the manually adjusted screen color temperature.

10. The electronic reading device of claim 1 , wherein the circuitry is further configured to
determine if the screen color temperature is manually increased during the sunrise transition,
determine if the screen color temperature is manually decreased during the sunrise transition,
delay start of daytime phase by one hour when the screen color temperature is manually decreased during the sunrise transition, and
continue the transition in the sunrise phase from the manually adjusted screen color temperature.

11. The electronic reading device of claim 1 , wherein the circuitry is further configured to
determine if the screen color temperature is manually adjusted during the daytime phase,
display the manually adjusted screen color temperature until the end of the daytime phase, and
cause the starting point of the sunset transition phase to be the manually adjusted screen color temperature.

12. The electronic reading device of claim 1 , wherein the circuitry is further configured to
determine if the screen color temperature is manually adjusted during the night phase,
display the manually adjusted screen color temperature until the end of the night phase, and
cause the starting point of the sunrise transition phase to be the manually adjusted screen color temperature.

13. The electronic reading device of claim 1 , wherein the circuitry is further configured to
determine if the screen color temperature is manually adjusted to less than 1900K,
display the manually adjusted screen color temperature until the beginning of the next sunrise transition, and
cause the starting point of the next sunrise transition to be the manually adjusted screen color temperature.

14. A method, comprising:
determining, via processing circuitry, if a transition between phases has occurred, wherein the phases include a night phase, a sunrise transition phase, a daytime phase, and a sunset transition phase;
automatically displaying, via processing circuitry, a predetermined screen color temperature via an adjustable RGBW front light in response to the transition between phases;
determining, via processing circuitry, if a brightness level has changed based on brightness information received via an ambient light sensor; and
automatically adjusting a 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.

15. The method of claim 14 , wherein the night phase is from a bedtime to a predetermined sunrise, the bedtime being a default setting or manually selected by a user, and
wherein the predetermined sunrise includes a manually selected time of day, a default setting, or an automatically adjusted setting corresponding to the time of sunrise changing throughout a year.

16. The method of claim 15 , wherein the predetermined screen color temperature of the night phase is 1900K.

17. The method of claim 14 , wherein the sunrise transition phase is from the predetermined sunrise to the start of the daytime phase such that the predetermined screen color temperature transitions from 1900K at the beginning of the sunrise transition phase to 6400K at the beginning of the daytime phase,
wherein the daytime phase is from a predetermined beginning of the daytime phase to a predetermined beginning of the sunset transition phase, and
wherein the sunset transition phase is from a predetermined beginning of the sunset transition phase to the bedtime, wherein the bedtime is the beginning of the night phase, such that the predetermined screen color temperature transitions from 6400K at the beginning of the sunset transition phase to 1900K at the bedtime.

18. The method of claim 14 , further comprising:
determining if a current phase is the sunrise transition phase;
automatically increasing the screen color temperature at a first predetermined rate of change;
determining if the current phase is the sunset transition phase; and
automatically decreasing the screen color temperature at a second predetermined rate of change.

19. The method of claim 14 , further comprising:
receiving the bedtime corresponding to the beginning of the night phase;
determining if the screen color temperature

Assignees

• Rakuten Kobo Inc

Inventors

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

Classifications

• H05B45/24

  using electrical feedback from LEDs or from LED modules · CPC title

• H05B45/20

  Controlling the colour of the light · CPC title

• H05B47/16

  by timing means · CPC title

• H05B47/11

  by determining the brightness or colour temperature of ambient light · CPC title

• H04M1/0279

  Improving the user comfort or ergonomics · CPC title