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Image signal correcting method, correcting circuit, electrooptic apparatus and electronic device
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A technology for image signals and correction circuits, used in optics, nonlinear optics, cathode ray tube indicators, etc.
Inactive Publication Date: 2009-05-20
SEIKO EPSON CORP
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[0015] However, in this phase expansion drive, since a plurality of data lines 114 are grouped and driven, a phenomenon in which the display content of a certain group is superimposed on the pixels of an adjacent group to be displayed (group ghosting) may occur.
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Embodiment approach 1
[0030] figure 1 It is a block diagram showing the overall configuration of an electro-optical device to which a correction circuit according to an embodiment of the present invention is applied.
[0031] As shown in this figure, the electro-optical device is composed of an electro-optic panel 100 , a control circuit 200 and a processing circuit 300 . Among them, since the electro-optic panel 100 has the same configuration as that shown in FIG. 5 , no special description is required.
[0032] The control circuit 200 generates a timing signal, a clock signal, and the like for controlling each part based on a vertical scanning signal Vs, a horizontal scanning signal Hs, and a dot clock signal DCLK supplied from a host device not shown.
[0033] The processing circuit 300 is composed of an S / P (serial-parallel) conversion circuit 310 , a correction circuit 320 , a D / A (digital-analog) converter group 330 and an amplification and inversion circuit 340 .
[0034] Among them, the ...
Embodiment approach 2
[0055] In addition to the form of the first embodiment, the voltage change (gradation change) when two groups before that are selected, the voltage change (gradation change) when the previous group is selected, etc. can also be considered.
[0056] In addition, when viewed from the application point of the voltage LCcom, if the resistance of the counter electrode 108 is different between the left and the right in the display area, it may proceed from the left to the right according to the selected group. make the coefficient k 1 、k 2 Composition of change.
[0057] In addition, as described below, in order to form a horizontally reversed image, when the horizontal scanning direction is determined as the direction from the right side to the left side, the coefficient k can also be set corresponding to the horizontal position of the selected group. 1 、k 2 Variety.
[0058] Furthermore, even in Embodiment 1 above, the six data lines 114 combined into one are sampled and conve...
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Abstract
The present invention reduces block ghosts during a phase expansion driving in which a plurality of data lines are blocked to sample image signals in bulk. In the phase expansion driving system, correction data(Db) is obtained by adding the average value of gradation levels that have changed from a block immediately preceding a block of interest when the block of interest is selected to the average value of gradation levels that have changed from a block second immediately preceding the block of interest when the immediately preceding block is selected. At this time, the former average value is weighted heavier than the latter one. Then, the correction data(Db) is added to each of the video data(Vd1d-Vd6d) of the pixels belonging to the block of interest to produce video data(Vd1e-Vd6e) as corrected, which is then subjected to an analog conversion and to a polarity inversion and then supplied to an image signal line of an electrooptic panel.
Description
technical field [0001] The present invention relates to an image signal correction method and an image signal correction circuit suitable for electro-optical devices, and electro-optical devices and electronic equipment using them. Background technique [0002] An electro-optic panel that performs display using electro-optic changes of an electro-optic substance, for example, an electro-optic panel that uses liquid crystal as an electro-optic substance and is used in a light valve of a projector has a general structure as follows. That is to say, in this electro-optic panel, liquid crystal is sandwiched between a pair of substrates, and on one substrate, as shown in FIG. 5 , a plurality of scanning lines 112 and a plurality of data lines 114 are arranged to cross each other. In addition, pairs of thin film transistors (hereinafter referred to as “TFTs”) 116 and pixel electrodes 118 are provided corresponding to respective crossing portions of the scan lines 112 and the data ...
Claims
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