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US 8,896,508 B2Granted
Electro-optical device, driving method therefor, and electronic apparatus
AssigneeSeiko Epson Corporation
InventorTetsuro Matsumoto
Life of this patent
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Abstract
An electro-optical device includes a temperature detecting unit that detects temperature, wherein the electro-optical device sets a number of sub-frames of plural sub-frames included in one frame according to the temperature detected by the temperature detecting unit and sets a luminance level of pixels in each of the plural sub-frames to at least a first level or a second level to perform gradation display.
Claims6
A liquid crystal device comprising:
- a temperature detecting unit configured to detect a temperature near a display area of the liquid crystal device;
- a system-clock generating unit configured to dynamically set a number of sub-frames k included in one frame in response to the temperature detected by the temperature detecting unit, the frame having a constant frame frequency fFM, the number of the sub-frames increasing in response to a decrease of the temperature detected by the temperature detecting unit, the number of sub-frames being within a predetermined range from a minimum number to a maximum number, and a frequency fSCLK of the system-clock generating unit is calculated based on Equation (1):
- f
- SCLK
- =
- f
- FM
- ×
- k
- ×
- m
- ×
- n
- N
- Equation
-
-
- (
- 1
- )
- a code generating unit configured to generate a digital code for a pixel, the digital code includes:
- (1) a black display code, (2) a gradation code, and (3) a keep code, the black display code including a predetermined number of bit data indicating a black level, the gradation code including a predetermined number of bit data indicating the black level or a white level configured to show a gradation, the gradation code following the black display code, the keep code including a predetermined number of bit data indicating the black level or a white level configured to keep a gradation, the keep code following the gradation code;
- and
- a controlling unit configured to control a luminance level of pixels in accordance with bit data included in the digital data generated by the code generating unit, wherein
- the black display code, the gradation code, and the keep code are predetermined for each gradation level, and a length from a head of the black display code to an end of the gradation code is substantially greater than the minimum number of the sub-frames, and
- m represents a number of scanning lines, n represents a number of data lines, and N represents a number of expanded phases.
23 more elements
A driving method for a liquid crystal device comprising:
- detecting a temperature near a display area of the liquid crystal device;
- dynamically setting a number of sub-frames k included in one frame in response to the temperature, the frame having a constant frame frequency fFM, the number of the sub-frames increasing in response to a decrease of the detected temperature, the number of sub-frames being within a predetermined range from a minimum number to a maximum number, and a frequency fSCLK of the system-clock generating unit is calculated based on Equation (1):
- f
- SCLK
- =
- f
- FM
- ×
- k
- ×
- m
- ×
- n
- N
- Equation
-
-
- (
- 1
- )
- generating a digital code for a pixel, the digital code includes:
- (1) a black display code, (2) a gradation code, and (3) a keep code, the black display code including a predetermined number of bit data indicating a black level, the gradation code including a predetermined number of bit data indicating the black level or a white level configured to show a gradation, the gradation code following the black display code, the keep code including a predetermined number of bit data indicating the black level or a white level configured to keep a gradation, the keep code following the gradation code;
- and
- controlling a luminance level of pixels in accordance with bit data included in the digital data generated by the code generating unit, wherein
- the black display code, the gradation code, and the keep code are predetermined for each gradation level, and a length from a head of the black display code to an end of the gradation code is substantially greater than the minimum number of the sub-frames, and
- m represents a number of scanning lines, n represents a number of data lines, and N represents a number of expanded phases.
23 more elements
Dependencies are inferred from the claim text.