Electro-optical device, method of driving the same and electronic apparatus
View Patent ↗To provide a method for manufacturing an electro-optical device that is capable of controlling more smoothly brightness as compared with a control in every one frame and preventing large current from flowing when switching frames in a peak brightness control, a method of driving the same, and an electronic apparatus. A grayscale data average value operation unit 33 performs, for each line, an average value calculation of grayscale levels of images corresponding to images of an one-frame-length and outputs, based on average value for the one frame-length, mode signals M 1 to M 4 for brightness control in each line. A driver input data converter 34 rewrites, based on the mode signals M 1 to M 4 from the grayscale data average value operation unit 33 , grayscale data HD for one line among grayscale data from a frame memory 31 into grayscale data DD. The driver input data converter 34 outputs grayscale data DD which is image data for the one frame-length and whose brightness is adjusted in a signal generating circuit.
1. An electro-optical device comprising:
a plurality of scanning lines;
a plurality of data lines;
pixel circuits having electro-optical elements respectively provided corresponding to intersections of the plurality of scanning lines and the plurality of data lines; and
a brightness control circuit for controlling the brightness of the electro-optical element of each pixel circuit, based on grayscale data, to control peak brightness,
the brightness control circuit comprising:
a brightness state judging circuit for, whenever grayscale data for one line or plural lines defining a partial frame is inputted, calculating a brightness state for one frame-length including the one line or plural lines defining a partial frame and judging the brightness state based on the calculation result, wherein the brightness state judging circuit comprises:
a first adding circuit for, whenever grayscale data for one line or plural lines is inputted, respectively adding grayscale data for the one line or plural lines;
a shift circuit for holding the addition result of the first adding circuit for one frame-length;
a second adding circuit for, whenever grayscale data for one line or plural lines is inputted, respectively adding output data of the shift circuit corresponding to the number of lines for the one frame-length including the one line or plural lines;
a judging circuit for, whenever grayscale data for one line or plural lines is inputted, judging the brightness state for the one frame-length including the one line or plural lines based on the addition result of the second adding circuit; and
a brightness mode selecting circuit for selecting one mode from a plurality of brightness modes based on the judgment result of the judging circuit; and
a brightness control circuit for, whenever grayscale data for the one line or plural lines is inputted, controlling the brightness of electro-optical elements of pixel circuits for one line or plural lines based on the judgment result of the brightness state judging circuit.
2. An electro-optical device comprising:
a plurality of scanning lines;
a plurality of data lines;
pixel circuits having electro-optical elements respectively provided corresponding to intersections of the plurality of scanning lines and the plurality of data lines; and
a brightness control circuit for controlling the brightness of the electro-optical element of each pixel circuit, based on grayscale data, to control peak brightness,
the brightness control circuit comprising:
a brightness state judging circuit for, whenever grayscale data for one line or plural lines defining a partial frame is inputted, calculating a brightness state for one frame-length including the one line or plural lines defining a partial frame and judging the brightness state based on the calculation result, wherein the brightness state judging circuit composes:
a first adding circuit for, whenever grayscale data for one line or plural lines is inputted, respectively adding grayscale data for the one line or plural lines;
a first shift circuit for holding the addition result of the first adding circuit for one frame-length;
a second adding circuit for, whenever grayscale data for one line or plural lines is inputted, respectively adding output data of the first shift circuit corresponding to a number of lines for the one frame-length including the line or plural lines;
a second shift circuit for holding the addition result of the second adding circuit for multiple frame-lengths;
a third adding circuit for, whenever grayscale data for one line or plural lines is inputted, respectively adding output data of the second shift circuit corresponding to the number of lines for the multiple frame-lengths including the line or plural lines;
a judging circuit for, whenever grayscale data for one line or plural lines is inputted, judging the brightness state for the one frame-length including the line or plural lines based on the addition result of the third adding circuit; and
a selecting circuit for selecting one mode from a plurality of brightness modes based on the judgment result of the judging circuit.
3. An electro-optical device comprising:
a plurality of scanning lines;
a plurality of data lines;
pixel circuits having electro-optical elements respectively provided corresponding to intersections of the plurality of scanning lines and the plurality of data lines; and
a brightness control circuit for controlling the brightness of the electro-optical element of each pixel circuit, based on grayscale data, to control peak brightness,
the brightness control circuit comprising:
a brightness state judging circuit for, whenever grayscale data for one line or plural lines consisting defining a partial frame is inputted, calculating a brightness state for one frame-length including the one line or plural lines consisting defining a partial frame and judging the brightness state based on the calculation result, wherein the brightness state judging circuit comprises:
a first adding circuit for, whenever grayscale data for one line or plural lines is inputted, respectively adding grayscale data for the one line or plural lines;
a first shift circuit for holding the addition result of the first adding circuit for one frame-length;
a second adding circuit for, whenever grayscale data for one line or plural lines is inputted, respectively adding output data of the first shift circuit corresponding to a number of lines for the one frame-length including the line or plural lines;
a second shift circuit for holding the addition result of the second adding circuit for multiple frame-lengths;
a third adding circuit for, whenever grayscale data for one line or plural lines is inputted, respectively adding output data of the second shift circuit corresponding to the number of lines for the multiple frame-lengths including the line or plural lines;
a selecting circuit for selecting one of the addition result of the second adding circuit and the addition result of the third adding circuit according to changes in the brightness state for the one frame-length;
a judging circuit for, whenever grayscale data for one line or plural lines is inputted, judging the brightness state for the one frame-length including the one line or plural lines based on the selection result of the selecting circuit; and
a brightness mode selecting circuit for selecting one mode from a plurality of brightness modes based on the judgment result of the judging circuit.
4. The electro-optical device according to claim 1 , wherein the brightness control circuit comprises:
a converting circuit for converting grayscale data according to a brightness mode selected by the brightness mode selecting circuit.
5. The electro-optical device according to claim 1 , wherein the brightness control circuit sets one light-emitting interval of a plurality of light-emitting intervals of the pixel circuits according to a brightness mode selected by the brightness mode selecting circuit.
6. A method of driving an electro-optical device comprising a plurality of scanning lines, a plurality of data lines, pixel circuits having electro-optical elements respectively provided corresponding to intersections of the plurality of scanning lines and the plurality of data lines, and a brightness control circuit for controlling the brightness of the electro-optical element of each pixel circuit, based on grayscale data, to control peak brightness, the method comprising:
whenever grayscale data for one line or plural lines defining of a partial frame is inputted, calculating a brightness state for one frame-length including the one line or plural lines defining of a partial frame by, whenever grayscale data for one line or plural lines is inputted, respectively adding grayscale data for the one line or plural lines to create a first addition result, holding the first addition result for one frame-length, and whenever grayscale data for one line or plural lines is inputted, respectively adding output data corresponding to a number of lines for the one frame-length including the one line or plural lines to create a second addition result;
judging the brightness state based on the calculation result by judging the brightness state for the one frame-length including the one line or plural lines based on the second addition result and selecting one mode from a plurality of brightness modes based on the judgment result; and
whenever grayscale data for one line or plural lines is inputted, controlling the brightness for the one line or plural lines based on the judgment result.
7. The method of driving an electro-optical device according to claim 6 , wherein the control of brightness for one line or plural lines based on the judgment result is performed by changing the grayscale data.
8. The method of driving an electro-optical device according to claim 6 , wherein the control of the brightness for one line or plural lines based on the judgment result is performed by changing a driving interval of the electro-optical device.
9. An electronic apparatus in which an electro-optical device according to claim 1 is contained.