Display method for liquid crystal panel, and display apparatus
View Patent ↗A display method for a liquid crystal panel is provided. The method includes a step of scanning pixels, arranged in a matrix, in an horizontal direction and in a vertical direction, to write video signals, thereby performing display; and a step of delaying the vertical-direction scanning for writing the video signals by a predetermined amount of time and writing a first predetermined fixed-level signal to all pixels in a row specified by the vertical-direction scanning delayed by the predetermined amount of time, in a predetermined time in the horizontal blanking period, thereby performing display.
1. A liquid crystal display, comprising:
a liquid-crystal cell array having a plurality of sets, the sets being configured by pixels and TFTs for driving the pixels respectively;
a data-line drive circuit that scans data lines connected to the TFTs to supply video signals including a black-level signal and a pre-charge level signal in a horizontal blanking period; and
a row drive circuit that scans gate lines connected to the TFTs to supply a drive signal, thereby writing the video signals to the pixels, wherein:
the data-line drive circuit supplies the black level signal to all the data lines simultaneously in a first period of the horizontal blanking period, supplies the pre-charge level signal to all the data lines simultaneously in a second period of the horizontal blanking period, and successively supplies the image signals excluding the black level and the pre-charge level signals in a horizontal period after the horizontal blanking period;
the row drive circuit includes a first row selection circuit and a second row selection circuit;
the first row selection circuit scans the gate lines, writes the black-level signal to all the pixels in the scanned lines simultaneously and then writes the pre-charge level signal to all the pixels in the scanned lines simultaneously, and successively writes the image signals excluding the black-level and the pre-charge level signals to the pixels in the scanned lines; and
the second row selection circuit starts to scan the gate lines with delay of a predetermined time relative to the first row selection circuit, scans the gate lines only in a time corresponding to the first period of the horizontal blanking period, and writes the black-level signal to all the pixels in the scanned lines simultaneously in the first period of the horizontal blanking period.
2. The liquid crystal display apparatus according to claim 1 , wherein the predetermined time is determined according to a movement amount of an entire image expressed by video signals or scene mode switching signals.
3. The liquid crystal display apparatus according to claim 1 , further comprising a light-control unit for controlling an amount of emission light of the liquid crystal display apparatus, thereby adjusting the amount of emission light in accordance with a scene-mode switching signal or a movement amount of an entire image expressed by the video signals.
4. The liquid crystal display apparatus according to claim 1 , further comprising a gamma corrector or a gain adjustor to adjust a gamma curve or gain in accordance with a scene-mode switching signal or a movement amount of an entire image expressed by the video signals.
5. A display method for a liquid crystal display apparatus having a liquid-crystal cell array having a plurality of sets, the sets being configured by pixels and TFTs for driving the pixels respectively, a data-line drive circuit that scans data lines connected to the TFTs to supply video signals including a black-level signal and a pre-charge level signal in a horizontal blanking period, and a row drive circuit that scans gate lines connected to the TFTs to supply a drive signal, thereby writing the video signals to pixels, the row drive circuit includes a first row selection circuit and a second row selection circuit, the method comprising:
supplying the black level signal to all the data lines simultaneously in a first period of the horizontal blanking period with the data-line drive circuit;
supplying the pre-charge level signal to all the data lines simultaneously in a second period of the horizontal blanking period with the data-line drive circuit; and
successively supplying the image signals excluding the black-level and the pre-charge level signals in a horizontal period after the horizontal blanking period with the data-line drive circuit;
scanning the gate lines with the first row selection circuit;
writing the black-level signal to all the pixels in the scanned lines simultaneously with the first row selection circuit;
writing the pre-charge level signal to all the pixels in the scanned lines simultaneously with the first row selection circuit;
successively writing the image signals excluding the black-level and the pre-charge level signals to the pixels in the scanned lines with the first row selection circuit;
starting to scan the gate lines with delay of a predetermined time relative to the first row selection circuit with the second row selection circuit;
scanning the gate lines only in a time corresponding to the first period of the horizontal blanking period with the second row selection circuit; and
writing the black-level signal to all the pixels in the scanned lines simultaneously in the first period of the horizontal blanking period with the second row selection circuit.