Input device with backlight function and backlight color adjustment method thereof
AssigneePrimax Electronics Ltd.
InventorsDing-Hsiang Pan, Hui-Ling Lin
Life of this patent
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Abstract
An input device with a backlight function and a backlight color adjustment method are provided. The input device with the backlight function includes a casing, plural color light-emitting elements, a control module and a charge-coupled device. The control module provides electric power to at least two selected color light-emitting elements through a power supply circuit. By the control module, the chromaticity value of a mixed white light beam from the color light-emitting element is adjusted to be consistent with the chromaticity value of a white light beam, and the luminance value of the mixed white light beam from the color light-emitting element is adjusted to be consistent with the luminance value of the white light beam.
Claims13
A backlight color adjustment method for an input device with plural color light-emitting elements, each color light-emitting element comprising a red light-emitting unit, a green light-emitting unit, a blue light-emitting unit and a white light-emitting unit, the backlight color adjustment method comprising steps of:
- (A) providing electric power to at least two selected color light-emitting elements of the plural color light-emitting elements;
- (B) driving the white light-emitting unit of each of the selected color light-emitting elements to emit a first white light beam;
- (C) measuring a first chromaticity value and a first luminance value of the first white light beam;
- (D) allowing the red light-emitting unit, the green light-emitting unit and the blue light-emitting unit of each of the selected color light-emitting elements to generate a first mixed white light beam according to the corresponding first chromaticity value;
- (E) measuring a first mixed chromaticity value and a first mixed luminance value of the first mixed white light beam;
- (F) allowing the first mixed chromaticity value and the first chromaticity value of each of the selected color light-emitting elements to be within 10% of each other, so that a first adjusting parameter corresponding to the red light-emitting unit, the green light-emitting unit and the blue light-emitting unit is acquired;
- (G) driving the white light-emitting unit of each of the selected color light-emitting elements to emit a second white light beam according to the corresponding first mixed luminance value, or driving the red light-emitting unit, the green light-emitting unit and the blue light-emitting unit of each of the selected color light-emitting elements to emit a second mixed white light beam according to the corresponding first luminance value;
- (H) measuring a second luminance value of the second white light beam, or measuring a second mixed luminance value of the second mixed white light beam;
- (I) adjusting the second luminance value and the first mixed luminance value of each of the selected color light-emitting elements to be within 10% of each other so as to acquire a second adjusting parameter corresponding to the white light-emitting unit, or adjusting the second mixed luminance value and the first luminance value of each of the selected color light-emitting elements to be within 10% of each other so as to acquire a third adjusting parameter corresponding to the red light-emitting unit, the green light-emitting unit and the blue light-emitting unit;
- and
- (J) performing a gray level adjustment process according to the first adjusting parameter and the second adjusting parameter, or performing the gray level adjustment process according to the first adjusting parameter and the third adjusting parameter.
An input device with a backlight function, the input device comprising:
- a casing;
- plural color light-emitting elements disposed within the casing, wherein each of the plural color light-emitting elements comprises a red light-emitting unit, a green light-emitting unit, a blue light-emitting unit and a white light-emitting unit, wherein the red light-emitting unit, the green light-emitting unit, the blue light-emitting unit and the white light-emitting unit are controlled to selectively emit a red light beam, a green light beam, a blue light beam and a white light beam to the casing, respectively;
- a control module disposed within the casing, and electrically connected with the plural color light-emitting elements, wherein the control module comprises a power supply circuit;
- and
- a charge-coupled device that senses chromaticity values and luminance values of the red light beam, the green light beam, the blue light beam and the white light beam,
- wherein the control module provides electric power to at least two selected color light-emitting elements of the plural color light-emitting elements through the power supply circuit, wherein after the control module adjusts current values corresponding to the red light-emitting unit, the green light-emitting unit, the blue light-emitting unit and the white light-emitting unit, a chromaticity value of a mixed white light beam of the red light beam, the green light beam and the blue light beam is within 10% of the chromaticity value of the white light beam, and a luminance value of the mixed white light beam is within 10% of the luminance value of the white light beam.
Dependencies are inferred from the claim text.