JP2004117598A5 - - Google Patents

Claims (13)

A first step of reading out the corresponding digital correction data from a lookup table in which digital correction data as a result of gamma correction corresponding to the digital video data is stored in advance using the digital video data as a reference address;
A second step of generating pulse width modulation output data obtained by converting the digital correction data into a pulse width;
The driving method of a display panel; and a third step of applying to the data electrodes of the display panel a voltage of high level or low level was selected based on the pulse width modulation output data. The display panel according to claim 1, wherein a plurality of types of the look-up tables are provided, and the plurality of types of the look-up tables are switched and used in the first step according to the display panel. Driving method. A plurality of types of look-up tables according to display color tone are provided, and in the first step, a plurality of types of look-up tables according to display color tone are switched and used according to display contents. The display panel driving method according to claim 1, wherein: When the display panel is a color display panel, the red, green, and blue data of the digital video data are adapted to the red, green, and blue transmittance characteristics with respect to the voltage applied to the color display panel. In order to independently perform the gamma correction to be corrected, at least three kinds of the look-up tables are provided, and in the first step, the digital video data is changed according to red data, green data, and blue data. 4. The display panel driving method according to claim 1, wherein the at least three types of the look-up tables are switched and used. The sampling frequency for the pulse width modulation in the second step is a frequency that is not less than 10 times and not more than 100 times a horizontal synchronization frequency of the digital video data. 2. A method for driving a display panel according to 1. 6. The display panel driving method according to claim 1, wherein in the third step, a circuit system from the data electrode to the pixel functions as a low-pass filter. 7. A display panel;
A lookup table in which digital correction data as a result of gamma correction corresponding to the digital video data is stored in advance, and the digital correction data corresponding from the lookup table using digital video data supplied from the outside as a reference address A gamma conversion circuit having a gamma conversion unit for reading
A pulse width modulation circuit for generating pulse width modulation output data obtained by converting the digital correction data into a pulse width; and
Display device characterized by comprising an output circuit for a voltage of high level or low level was selected based on the pulse width modulation output data is applied to data electrodes of the display panel. The display device according to claim 7, wherein a plurality of types of the lookup tables are provided, and the gamma conversion unit switches between the plurality of types of the lookup tables according to the display panel. A plurality of types of look-up tables corresponding to display colors are provided, and the gamma conversion unit switches between a plurality of types of look-up tables according to display colors according to display contents. The display device according to claim 7 or 8. The display panel is a color display panel, so that the red, green, and blue data of the digital video data are adapted to the characteristics of red, green, and blue transmittance with respect to the applied voltage of the color display panel. In order to independently perform the gamma correction to be corrected, at least three types of the lookup tables are provided, and the gamma conversion unit is configured to perform the at least three types according to red data, green data, and blue data of the digital video data. The display device according to claim 7, wherein the type of lookup table is switched and used. 11. The display device according to claim 7, wherein a sampling frequency for the pulse width modulation is a frequency not less than 10 times and not more than 100 times a horizontal synchronization frequency of the digital video data. 12. The display device according to claim 7, wherein a circuit system from the data electrode to the pixel functions as a low-pass filter. A monitor comprising the display device according to claim 7.