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US 7,548,226 B2Granted
Liquid crystal display
AssigneeSharp Kabushiki Kaisha
InventorDaiichi Sawabe
Life of this patent
Estimating the term…
Abstract
A liquid crystal display is driven at, for example, a frame frequency of 100 Hz or higher. There are provided a base-4 frame counter 2 and a source control signal generator section controlling the polarity of the liquid crystal in pixels so as to alternately repeat, for each frame, a horizontal reversal once every m lines (m is 2 or a greater positive integer) and a horizontal reversal once every m lines after shifting the polarity of the lines in the preceding frame by n lines (n is a positive integer equal to a half or less of m). The provision achieves a liquid crystal display and a method of driving the display, addresses insufficient charging at higher frame frequencies and accomplishing higher display quality.
Claims29
A liquid crystal display in which pixels are driven by active matrix drive, the display comprising:
- a liquid crystal display screen composed of pixels arranged in a matrix, the liquid crystal display screen being divided into a first screen and a second screen;
- gate driver to output a gate pulse to gate lines connected to gates of thin film transistors in the pixels, the gate driver being divided into a first gate driver to output a gate pulse to gate lines connected to gates of thin film transistors in pixels in the first screen and a second gate driver to output a gate pulse to gate lines connected to gates of thin film transistors in pixels in the second screen;
- source driver to output a source voltage to source lines connected to sources of the thin film transistors in the pixels, the source driver being divided into a first source driver to output a source voltage to source lines connected to sources of the thin film transistors in the pixels in the first screen and a second source driver to output a source voltage to source lines connected to sources of the thin film transistors in the pixels in the second screen;
- interframe polarity controller to control to alternately repeat, for each frame, a first reversal pattern where a polarity of liquid crystal in the pixels is subjected to a horizontal reversal once every m lines, m being 2 or a greater positive integer and a second reversal pattern where polarity reversal of lines in the first reversal pattern is shifted by n lines, n being a positive integer equal to a half or less of m.
1 more element
A liquid crystal display in which pixels are driven by active matrix drive, the display comprising:
- a liquid crystal display screen composed of pixels arranged in a matrix, the liquid crystal display screen being divided into a first screen and a second screen;
- gate driver to output a gate pulse to gate lines connected to gates of thin film transistors in the pixels, the gate driver being divided into a first gate driver to output a gate pulse to gate lines connected to gates of thin film transistors in pixels in the first screen and a second gate driver to output a gate pulse to gate lines connected to gates of thin film transistors in pixels in the second screen;
- source driver to output a source voltage to source lines connected to sources of the thin film transistors in the pixels, the source driver being divided into a first source driver to output a source voltage to source lines connected to sources of the thin film transistors in the pixels in the first screen and a second source driver to output a source voltage to source lines connected to sources of the thin film transistors in the pixels in the second screen;
- a frame frequency is 100 Hz or higher;
- and
- interframe polarity controller to control a polarity of liquid crystal in the pixels every so that a horizontal reversal for every two lines and a horizontal reversal for every line are alternately repeated for each frame.
3 more elements
A liquid crystal display in which pixels are driven by active matrix drive, the display comprising:
- a liquid crystal display screen composed of pixels arranged in a matrix, the liquid crystal display screen being divided into a first screen and a second screen;
- gate driver to output a gate pulse to gate lines connected to gates of thin film transistors in the pixels, the gate driver being divided into a first gate driver to output a gate pulse to gate lines connected to gates of thin film transistors in pixels in the first screen and a second gate driver to output a gate pulse to gate lines connected to gates of thin film transistors in pixels in the second screen;
- source driver to output a source voltage to source lines connected to sources of the thin film transistors in the pixels, the source driver being divided into a first source driver to output a source voltage to source lines connected to sources of the thin film transistors in the pixels in the first screen and a second source driver to output a source voltage to source lines connected to sources of the thin film transistors in the pixels in the second screen;
- a frame frequency is 100 Hz or higher;
- and
- polarity controller to subject for each frame, a polarity of liquid crystal in the pixels to a horizontal reversal once for a number of lines.
3 more elements
A liquid crystal display in which pixels are driven by active matrix drive, the display comprising:
- a liquid crystal display screen composed of pixels arranged in a matrix;
- gate driver to output a gate pulse to gate lines connected to gates of thin film transistors in the pixels, the gate driver implementing a gate 2 pulse drive to subject the pixels to precharging and actual charging during a horizontal scan period for one line;
- source driver to output a source voltage to source lines connected to sources of the thin film transistors in the pixels, the source driver adjusting the source voltage in actual charging in accordance with whether the pixels have identical or opposite polarities between frames when the gate driver implements the gate pulse drive;
- interframe polarity controller to control to alternately repeat, for each frame, a first reversal pattern where a polarity of liquid crystal in the pixels is subjected to a horizontal reversal once every m lines, m being 2 or a greater positive integer and a second reversal pattern where polarity reversal of lines in the first reversal pattern is shifted by n lines, n being a positive integer equal to a half or less of m.
1 more element
A liquid crystal display in which pixels are driven by active matrix drive, the display comprising:
- a liquid crystal display screen composed of pixels arranged in a matrix;
- gate driver to output a gate pulse to gate lines connected to gates of thin film transistors in the pixels, the gate driver implementing a gate 2 pulse drive to subject the pixels to precharging and actual charging during a horizontal scan period for one line;
- source driver to output a source voltage to source lines connected to sources of the thin film transistors in the pixels, the source driver adjusting the source voltage in actual charging from a polarity of the pixels in a preceeding frame and a source output potential in precharging when the gate driver implements the gate 2 pulse drive;
- interframe polarity controller to control to alternately repeat, for each frame, a first reversal pattern where a polarity of liquid crystal in the pixels is subjected to a horizontal reversal once every m lines, m being 2 or a greater positive integer and a second reversal pattern where polarity reversal of lines in the first reversal pattern is shifted by n lines, n being a positive integer equal to a half or less of m.
1 more element
A liquid crystal display in which pixels are driven by active matrix drive, the display comprising:
- a liquid crystal display screen composed of pixels arranged in a matrix, the liquid crystal display screen being divided into a first screen and a second screen;
- gate driver to output a gate pulse to gate lines connected to gates of thin film transistors in the pixels, the gate driver implementing a gate 2 pulse drive to subject the pixels to precharging and actual charging during a horizontal scan period for one line;
- source driver to output a source voltage to source lines connected to sources of the thin film transistors in the pixels, the source driver adjusting the source voltage in actual charging in accordance with whether the pixels have identical or opposite polarities between frames when the gate driver implements the gate pulse drive;
- a frame frequency is 100 Hz or higher;
- and
- interframe polarity controller to control a polarity of liquid crystal in the pixels every so that a horizontal reversal for every two lines and a horizontal reversal for every line are alternately repeated for each frame.
3 more elements
Dependencies are inferred from the claim text.