Electro-optical-device driving method, image processing circuit, electronic apparatus, and correction-data generating method
Correction tables store correction data. Based on the correction data, a linear interpolation circuit generates data in accordance with a data value of input image data. A latch circuit group latches each piece of output data of the linear interpolation circuit in synchronization with a rising edge of a block signal. A selector selects correction data based on an address signal and outputs the correction data to an adder circuit. The adder circuit adds delayed image data to the selected correction data, thus generating corrected image data. Accordingly, an error among channels, which is caused by phase expansion, can be corrected.
1. A correction-data generating method for generating correction data used to correct an error in a block period in a projector having an electro-optical panel which includes a plurality of switching elements provided corresponding to intersections of a plurality of scanning lines and a plurality of data lines, and a plurality of pixel electrodes provided corresponding to the plurality of switching elements, the electro-optical panel sequentially selecting the scanning lines and applying phase-expanded image signals in each block, which include the plurality of data lines, in a period during which each of the scanning lines is selected, the method comprising:
displaying on a screen gray levels corresponding to measurement levels of a plurality of measurement blocks to generate the correction data, each of the plurality of measurement blocks comprising a plurality of vertical lines;
displaying on the screen gray levels corresponding to reference levels of a plurality of reference blocks which are provided among the plurality of measurement blocks and which are used as a basis to determine positions of the measurement blocks, each of the plurality of reference blocks comprising a plurality of vertical lines;
generating an image signal by capturing an image on the screen using a video camera;
comparing the image signal with a threshold to distinguish the measurement levels from the reference levels;
detecting the measurement blocks based on the comparison result; and
generating the correction data for each of the data lines based on a difference between only the image signal and the gray levels corresponding to the measurement levels of the measurement blocks that are not adjacent to the reference blocks.
2. The correction-data generating method according to claim 1 , in the step of generating the correction data for each of the data lines, the correction data being generated based on an average image signal generated by averaging the image signals corresponding to the measurement blocks.
3. The correction-data generating method according to claim 1 , in the step of generating the correction data for each of the data lines, the correction data being generated based on an average image signal generated by averaging the image signals corresponding to the measurement blocks located in a partial region of the screen.