Display driver
AssigneeRenesas Electronics Corporation
InventorsAkihito Akai, Yasuyuki Kudo, Takuya Eriguchi, Kazuo Okado
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Abstract
In consideration of the current leakage path of a liquid crystal panel and a signal line voltage fluctuation due to the current leakage path, a γ adjusting function (second driving method) is applied for each divided period in the first driving method. In a signal line driving unit, a gray scale voltage obtained by adding or subtracting a voltage fluctuation value different in each of the output periods of each gray scale is generated, and a gray scale voltage taking the voltage fluctuation value into consideration is applied to a signal line.
Claims11
A display driver for a display panel which includes a signal line on one side of the panel and an opposite electrode on an opposite side of the panel, wherein a current leakage path exists between the signal line and the opposite electrode when a voltage is applied to the signal line, comprising:
- a generating circuit for generating gray scale voltages corresponding to each of a plurality of gray scales;
- and
- a selecting circuit for selecting a gray scale voltage to be outputted to the signal line of the display panel in accordance with inputted display data,
- wherein said selecting circuit selects a gray scale voltage to be outputted to said signal line from the gray scale voltages outputted through time division from said generating circuit for each signal line and controls a length of a period for outputting the selected gray scale voltage based on said display data,
- said generating circuit is configured to generate the gray scale voltage whose level to an ideal voltage is fluctuated due to charge transfer through the current leakage path in accordance with each of a plurality of periods obtained by time-division of one scanning period for outputting said gray scale voltage to said signal line, and
- said generating circuit generates the gray scale voltages whose levels differ in each divided period, which are obtained by adding or subtracting voltage fluctuation values corresponding to the charge transfer through the current leakage path to/from said gray scale voltage in each of the time-divided periods.
A display driver for a display panel which includes a signal line on one side of the panel and an opposite electrode on an opposite side of the panel, wherein a current leakage path exists between the signal line and the opposite electrode when a voltage is applied to the signal line, comprising:
- a generating circuit for generating gray scale voltages corresponding to each of a plurality of gray scales;
- and
- a selecting circuit for selecting a gray scale voltage to be outputted to the signal line of the display panel in accordance with inputted display data,
- wherein said selecting circuit selects a gray scale voltage to be outputted to said signal line from the gray scale voltages outputted through time division from said generating circuit for each signal line and controls a length of a period for outputting the selected gray scale voltage based on said display data,
- said generating circuit is configured to generate the gray scale voltage whose level to an ideal voltage is fluctuated due to charge transfer through the current leakage path in accordance with each of a plurality of periods obtained by time-division of one scanning period for outputting said gray scale voltage to said signal line, and
- said display driver includes means for outputting gray scale voltages whose levels differ in each divided period by performing level adjustment or conversion to the gray scale voltages generated by said generating circuit in accordance with voltage fluctuation values corresponding to the charge transfer through the current leakage path in each time-divided period in said signal line.
A display driver for a display panel which includes a signal line on one side of the panel and an opposite electrode on an opposite side of the panel, wherein a current leakage path exists between the signal line and the opposite electrode when a voltage is applied to the signal line, comprising:
- a generating circuit for generating gray scale voltages corresponding to each of a plurality of gray scales;
- and
- a selecting circuit for selecting a gray scale voltage to be outputted to the signal line of the display panel in accordance with inputted display data,
- wherein said selecting circuit selects a gray scale voltage to be outputted to said signal line from the gray scale voltages outputted through time division from said generating circuit for each signal line and controls a length of a period for outputting the selected gray scale voltage based on said display data,
- said generating circuit is configured to generate the gray scale voltage whose level to an ideal voltage is fluctuated due to charge transfer through the current leakage path in accordance with each of a plurality of periods obtained by time-division of one scanning period for outputting said gray scale voltage to said signal line,
- said display driver divides said scanning period into three periods and performs the driving in combination with a driving method in which the three periods are allocated to R line, G line, and B line corresponding to display colors, which are the signal lines of said display panel, and
- said display includes means for outputting gray scale voltages whose levels differ in each divided period, which are obtained by adding or subtracting voltage fluctuation values corresponding to the charge transfer through the current leakage path to/from a gray scale voltage generated in said generating circuit each time-divided period in said signal line for each of R, G, and B.
Dependencies are inferred from the claim text.