Light-emitting device and method for driving the same

A method for driving a light-emitting device comprising a display, the method comprising:

• providing the display, which comprises a plurality of pixels in which a plurality of first light-emitting elements each configured to emit light of a first light emission color and a plurality of second light-emitting elements each configured to emit light of a second light emission color different from the first light emission color are arranged in a predetermined pattern, wherein each of the plurality of pixels comprises at least one first light-emitting element of the plurality of first light-emitting elements, and at least one second light-emitting element of the plurality of second light-emitting elements, the light emission color of the plurality of second light-emitting elements being variable in accordance with a drive current of the second light-emitting elements;
• providing a lighting controller configured to supply a drive current to each of the plurality of first light-emitting elements and the plurality of second light-emitting elements and control a light emission period of each of the plurality of first light-emitting elements and the plurality of second light-emitting elements;
• providing an information storage configured to store current-chromaticity information for determining a drive current value to drive each of the plurality of first light-emitting elements and the plurality of second light-emitting elements to emit light in accordance with a specific light emission color of each of the plurality of pixels;
• and
• lighting, by the lighting controller, the plurality of first light-emitting elements and the plurality of second light-emitting elements by supplying a drive current to each of the plurality of first light-emitting elements and the plurality of second light-emitting elements and controlling a light emission period of each of the plurality of first light-emitting elements and the plurality of second light-emitting elements, wherein:
• the step of lighting, by the lighting controller, the plurality of first light-emitting elements and the plurality of second light-emitting elements comprises:
• determining a chromaticity of the second light emission color and a luminance ratio of the at least one first light-emitting element and the at least one second light-emitting element from a chromaticity signal and a luminance signal to be displayed by each of the plurality of pixels so as to correspond to the first light emission color,
• determining a light emission intensity corresponding to a luminance signal to be displayed based on the chromaticity of the second light emission color and the luminance ratio,
• supplying, by a first control circuit of the lighting controller, a drive current having a value corresponding to a light emission color of each of the at least one first light-emitting element and the at least one second light-emitting element to the corresponding one of the at least one first light-emitting element and the at least one second light-emitting element by referring to the information storage, and
• controlling, by a second control circuit of the lighting controller, a light emission period of the drive current to be supplied by the first control circuit in accordance with the determined light emission intensity.

A light-emitting device comprising:

• a display comprising a plurality of pixels in which a plurality of first light-emitting elements each configured to emit light of a first light emission color and a plurality of second light-emitting elements each configured to emit light of a second light emission color different from the first light emission color are arranged in a predetermined pattern;
• a lighting controller comprising:
• at least one first control circuit configured to supply a drive current to the first light-emitting elements and the second light-emitting elements, and
• at least one second control circuit configured to control a light emission period of the first light-emitting elements and the second light-emitting elements;
• and
• an information storage configured to store current-chromaticity information for determining a drive current value to drive each of the plurality of first light-emitting elements and the plurality of second light-emitting elements to emit light in accordance with a specific light emission color of each of the plurality of pixels, wherein:
• the plurality of pixels include a first pixel comprising at least part of a first light-emitting element of the plurality of first light-emitting elements, and a distinct second light-emitting element of the plurality of second light-emitting elements, the second light emission color of the distinct second light-emitting element being variable in accordance with a drive current of the distinct second light-emitting element,
• the lighting controller is configured to control the plurality of first light-emitting elements and the plurality of second light-emitting elements based on the current-chromaticity information stored in the information storage so that each of the plurality of first light-emitting elements and the plurality of second light-emitting elements emits light of a specific light emission color and light emission luminance,
• the lighting controller is configured to:
• determine a chromaticity of the second light emission color and a luminance ratio of the plurality of first light-emitting elements and the plurality of second light-emitting elements from a chromaticity signal and a luminance signal to be displayed by each pixel so as to correspond to the first light emission color, and
• determine a light emission intensity corresponding to a luminance signal to be displayed by the second light-emitting element based on the chromaticity of the second light emission color and the luminance ratio,
• the first control circuit is configured to supply a drive current having a value corresponding to a light emission color of each of the plurality of first light-emitting elements and the plurality of second light emitting elements to the corresponding one of the plurality of first light-emitting elements and the plurality of second light-emitting elements by referring to the information storage, and
• the second control circuit is configured to control a light emission period of the drive current supplied by the first control circuit in accordance with the determined light emission intensity.

A light-emitting device comprising:

• a display comprising a plurality of pixels in which a plurality of first light-emitting elements each configured to emit light of a first light emission color and a plurality of second light-emitting elements each configured to emit light of a second light emission color different from the first light emission color are arranged in a predetermined pattern;
• and
• a lighting controller configured to supply a drive current to each of the plurality of first light-emitting elements and the plurality of second light-emitting elements and control a light emission period of each of the plurality of first light-emitting elements and the plurality of second light-emitting elements, wherein:
• the plurality of pixels include a first pixel comprising at least part of a first light-emitting element of the plurality of first light-emitting elements, and a distinct second light-emitting element of the plurality of second light emitting elements, the light emission color of the distinct second light-emitting element being is variable in accordance with a drive current of the distinct second light-emitting element, wherein:
• the lighting controller is configured to set a time width for supplying a current to each of the plurality of first light-emitting elements and the plurality of second light-emitting elements based on comparison between a first signal comprising a triangular wave signal and a first DC voltage set in a predetermined period, and
• the lighting controller is configured to control a current value to be supplied based on a second DC voltage set in a period different from the predetermined period.