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

Patent metadata

Field	Value
Publication number	US-2018053486-A1
Application number	US-201715678734-A
Country	US
Kind code	A1
Filing date	Aug 16, 2017
Priority date	Aug 16, 2016
Publication date	Feb 22, 2018
Grant date	—

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

1 . A device, comprising:
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,
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.

2 . The device of claim 1 , wherein the current screen color temperature automatically changes based on the time of day.

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

4 . The device of claim 1 , wherein the brightness level changes automatically based on the time of day.

5 . The device of claim 4 , wherein the predetermined mixture of light changes in response to a change in the brightness level.

6 . The device of claim 5 , wherein the current screen color temperature does not change in response to a change in the brightness level.

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

8 . The device of claim 7 , wherein each of the current screen color temperatures has corresponding RGBW values.

9 . The device of claim 7 , 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.

10 . 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.

11 . 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 the display of the electronic reading device; calculating 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; displaying the predetermined mixture of light to the display of the electronic reading device via an adjustable RGBW front light.

12 . The method of claim 11 , wherein the current screen color temperature automatically changes based on the time of day.

13 . The method of claim 12 , wherein the predetermined mixture of light changes in response to a change in the current screen color temperature.

14 . The method of claim 11 , wherein the brightness level changes automatically based on the time of day.

15 . The method of claim 14 , wherein the predetermined mixture of light changes in response to a change in the brightness level.

16 . The method of claim 15 , wherein the current screen color temperature does not change in response to a change in the brightness level.

17 . The method of claim 11 , wherein the current screen color temperature includes 1500K to 6400K.

18 . The method of claim 17 , wherein each of the current screen color temperatures has corresponding RGBW values.

19 . The method of claim 17 , 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.

20 . The method of claim 11 , 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

• H05B47/16

  by timing means · CPC title

• H05B45/24

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

• H05B45/20

  Controlling the colour of the light · CPC title

• H05B47/11

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

• G09G2380/14

  Electronic books and readers · CPC title