Patent ID: 6501456
Filing Date: 2002-12-31
Classification: G09G

Abstract:
A method of driving a liquid crystal display apparatus, the liquid crystal display apparatus includingan array of pixels, a horizontal scanning circuit responsive to a horizontal scanning direction setting signal, a vertical scanning circuit responsive to a vertical scanning direction setting signal, an image signal supply circuit which receives pixel signals from an external source, the image signal supply circuit being connected to the array of pixels and being driven by the horizontal scanning circuit, and a vertical scanning control circuit connected to the array of pixels and being driven by the vertical scanning circuit, the vertical scanning circuit operating in cooperation with the horizontal scanning circuit to cause the pixel signals to be transferred from the image signal supply circuit to the array of pixels, each of the horizontal scanning circuit and the vertical scanning circuit including a series connection of bidirectional shift register stages, each of the bidirectional shift register stages including a first latch, a second latch, an intermediate output terminal, a first input/output terminal, and a second input/output terminal, the first latch being connected to the second latch through the intermediate output terminal, the first latch being connected through the first input/output terminal to a first one of two bidirectional shift register stages adjacent to a bidirectional shift register stage under consideration in the series connection of bidirectional shift register stages, the second latch being connected through the second input/output terminal to a second one of the two bidirectional shift register stages adjacent to the bidirectional shift register stage under consideration in the series connection of bidirectional shift register stages, the method comprising the steps of: when scanning in a first direction with the horizontal scanning circuit, operating that bidirectional shift register stage which is located most upstream of the scanning in the first direction in the series connection of bidirectional shift register stages in the horizontal scanning circuit so that the first latch of that bidirectional shift register stage does not supply an output to the image signal supply circuit and the second latch of that bidirectional shift register stage does supply an output to the image signal supply circuit; when scanning in a second direction with the horizontal scanning circuit, operating that bidirectional shift register stage which is located most upstream of the scanning in the second direction in the series connection of bidirectional shift register stages in the horizontal scanning circuit so that the second latch of that bidirectional shift register stage does not supply an output to the image signal supply circuit and the first latch of that bidirectional shift register stage does supply an output to the image signal supply circuit; when scanning in a first direction with the vertical scanning circuit, operating that bidirectional shift register stage which is located most upstream of the scanning in the first direction in the series connection of bidirectional shift register stages in the vertical scanning circuit so that the first latch of that bidirectional shift register stage does not supply an output to the vertical scanning control circuit and the second latch of that bidirectional shift register stage does supply an output to the vertical scanning control circuit; and when scanning in a second direction with the vertical scanning circuit, operating that bidirectional shift register stage which is located most upstream of the scanning in the second direction in the series connection of bidirectional shift register stages in the vertical scanning circuit so that the second latch of that bidirectional shift register stage does not supply an output to the vertical scanning control circuit and the first latch of that bidirectional shift register stage does supply an output to the vertical scanning control circuit.