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US 9,177,516 B2Granted
Description liquid crystal display device and pixel inspection method therefor
AssigneeJVC KENWOOD Corporation
InventorTakayuki Iwasa
Life of this patent
Estimating the term…
Abstract
A liquid crystal display device includes an inspection control unit configured to alternately perform a first inspection operation in which an inspection signal is input from a first column data line connected to one pixel of the two pixels in each of the pairs into the one pixel and is read out to a second column data line connected to another pixel through the other pixel of the two pixels in each of the pairs and a second inspection operation in which an inspection signal is input from the second column data line into the other pixel and is read out to the first column data line through the one pixel, on all of the plurality of pixels in a unit of pixels in each row when the pixels being inspected.
Claims6
A liquid crystal display device comprising:
- a plurality of pixels configured to be provided at an intersecting portion at which a plurality of column data lines intersects with a plurality of row scanning lines, in which two adjacent pixels that are connected to a same row scanning line are paired, each of the two pixels of each pairs individually including:
- a display element configured to be filled and seal with liquid crystal between a pixel electrode and a common electrode opposite to each other;
- a first switching unit configured to be connected to the row scanning line and configured to sample each subframe data for displaying each of a plurality of subframes having a display period shorter than one frame period of the video signal through the column data line when selecting a row, the plurality of subframes being for displaying one frame;
- a first signal holding unit configured to form a static random access memory together with the first switching unit and configured to store the subframe data sampled by the first switching unit;
- the display element, the first switching unit, and the first signal holding unit being provided separately in each of the pixels in the pair;
- and
- a second switching unit configured to connect or disconnect a connecting point between the first signal holding unit and the pixel electrode in the two pixels, the second switching unit being provided commonly in each of the pairs;
- a switching control unit configured to control the second switching unit to be turned off when writing and reading the pixels and control the second switching unit to be turned on when inspecting the pixels;
- a pixel control unit configured to perform, when writing and reading the pixels, for each of the subframe, an operation in which the subframe data is written into the first signal holding unit for each of the pixels per row in the plurality of pixels configuring the image display unit and the written data is applied to the pixel electrode;
- and
- an inspection control unit configured to alternately perform a first inspection operation in which an inspection signal is input from a first column data line connected to one pixel of the two pixels in each of the pairs into the one pixel and is read out to a second column data line connected to another pixel through the other pixel of the two pixels in each of the pairs and a second inspection operation in which an inspection signal is input from the second column data line into the other pixel and is read out to the first column data line through the one pixel, on all of the plurality of pixels in a unit of pixels in each row when the pixels being inspected.
8 more elements
A pixel inspection method for a liquid crystal display device including
- a plurality of pixels configured to be provided at an intersecting portion at which a plurality of column data lines intersects with a plurality of row scanning lines, in which two adjacent pixels that are connected to a same row scanning line are paired, each of the two pixels of each pairs individually including:
- a display element configured to be filled and seal with liquid crystal between a pixel electrode and a common electrode opposite to each other;
- a first switching unit configured to be connected to the row scanning line and configured to sample each subframe data for displaying each of a plurality of subframes having a display period shorter than one frame period of the video signal through the column data line when selecting a row, the plurality of subframes being for displaying one frame;
- a first signal holding unit configured to form a static random access memory together with the first switching unit and configured to store the subframe data sampled by the first switching unit;
- the display element, the first switching unit, and the first signal holding unit being provided separately in each of the pixels in the pair;
- and
- a second switching unit configured to connect or disconnect a connecting point between the first signal holding unit and the pixel electrode in the two pixels, the second switching unit being provided commonly in each of the pairs, in inspecting the pixels of the liquid crystal display device, the method comprising:
- controlling the second switching unit to be turned on;
- and
- alternately performing a first inspection operation in which an inspection signal is input from a first column data line connected to one pixel of the two pixels in each of the pairs into the one pixel and is read out to a second column data line connected to another pixel through the other pixel of the two pixels in each of the pairs and a second inspection operation in which an inspection signal is input from the second column data line into the other pixel and is read out to the first column data line through the one pixel, on all of the plurality of pixels in a unit of pixels in each rows.
7 more elements
Dependencies are inferred from the claim text.