METHOD FOR DRIVING LIQUID CRYSTAL DISPLAY DEVICE
First Claim
1. A liquid crystal display device comprising:
- a pixel having a light-transmitting pixel portion and a reflective pixel portion,the light-transmitting pixel portion comprising;
a first pixel transistor whose first terminal is electrically connected to a first signal line and whose gate is electrically connected to a scan line; and
a first liquid crystal element and a first capacitor which are electrically connected to a second terminal of the first pixel transistor,the reflective pixel portion comprising;
a second pixel transistor whose first terminal is electrically connected to the second terminal of the first pixel transistor and whose gate is electrically connected to a first selection line;
a second liquid crystal element and a second capacitor which are electrically connected to a second terminal of the second pixel transistor; and
a third pixel transistor whose first terminal is electrically connected to a second signal line, whose gate is electrically connected to a second selection line, and whose second terminal is electrically connected to the second liquid crystal element and the second capacitor.
1 Assignment
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Accused Products
Abstract
In an image signal writing period, a first image signal is supplied to a first liquid crystal element and a first capacitor from a first signal line. In a backlight lighting period, display is performed in a light-transmitting pixel portion in response to the first image signal. In a black grayscale signal writing period, a signal for black display is supplied to a second liquid crystal element and a second capacitor from a second signal line. In a still image signal writing period, a second image signal is supplied to the first liquid crystal element, the first capacitor, the second liquid crystal element, and the second capacitor from the first signal line. In a still image signal holding period, display is performed in the reflective pixel portion in response to the second image signal.
13 Citations
27 Claims
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1. A liquid crystal display device comprising:
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a pixel having a light-transmitting pixel portion and a reflective pixel portion, the light-transmitting pixel portion comprising; a first pixel transistor whose first terminal is electrically connected to a first signal line and whose gate is electrically connected to a scan line; and a first liquid crystal element and a first capacitor which are electrically connected to a second terminal of the first pixel transistor, the reflective pixel portion comprising; a second pixel transistor whose first terminal is electrically connected to the second terminal of the first pixel transistor and whose gate is electrically connected to a first selection line; a second liquid crystal element and a second capacitor which are electrically connected to a second terminal of the second pixel transistor; and a third pixel transistor whose first terminal is electrically connected to a second signal line, whose gate is electrically connected to a second selection line, and whose second terminal is electrically connected to the second liquid crystal element and the second capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for driving a liquid crystal display device comprising a plurality of pixels,
wherein each of the pixels comprises a light-transmitting pixel portion and a reflective pixel portion, wherein the light-transmitting pixel portion comprises a first pixel transistor whose first terminal is electrically connected to a first signal line and whose gate is electrically connected to a scan line, and a first liquid crystal element and a first capacitor which are electrically connected to a second terminal of the first pixel transistor, and wherein the reflective pixel portion comprises a second pixel transistor whose first terminal is electrically connected to the second terminal of the first pixel transistor and whose gate is electrically connected to a first selection line, a second liquid crystal element and a second capacitor which are electrically connected to a second terminal of the second pixel transistor, and a third pixel transistor whose first terminal is electrically connected to a second signal line, whose gate is electrically connected to a second selection line, and whose second terminal is electrically connected to the second liquid crystal element and the second capacitor, the method for driving the liquid crystal display device, comprising the steps of: -
in a first period, turning on the first pixel transistor, turning off the second pixel transistor, and supplying a first image signal to the first liquid crystal element and the first capacitor from the first signal line; in a second period, performing display in the light-transmitting pixel portion in response to the first image signal supplied in the first period; in a third period, turning on the third pixel transistor, and supplying a signal for black display to the second liquid crystal element and the second capacitor from the second signal line; repeating the first to third periods so that a moving image is displayed; in a fourth period, turning on the first pixel transistor, turning on the second pixel transistor, turning off the third pixel transistor, and supplying a second image signal to the first liquid crystal element, the first capacitor, the second liquid crystal element, and the second capacitor from the first signal line; in a fifth period, performing display in the reflective pixel portion in response to the second image signal supplied in the fourth period; and repeating the fourth and fifth periods so that a still image is displayed. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for driving a liquid crystal display device comprising a plurality of pixels,
wherein each of the pixels comprises a light-transmitting pixel portion and a reflective pixel portion, wherein the light-transmitting pixel portion comprises a first pixel transistor whose first terminal is electrically connected to a first signal line and whose gate is electrically connected to a scan line, and a first liquid crystal element and a first capacitor which are electrically connected to a second terminal of the first pixel transistor, and wherein the reflective pixel portion comprises a second pixel transistor whose first terminal is electrically connected to the second terminal of the first pixel transistor and whose gate is electrically connected to a first selection line, a second liquid crystal element and a second capacitor which are electrically connected to a second terminal of the second pixel transistor, and a third pixel transistor whose first terminal is electrically connected to a second signal line, whose gate is electrically connected to a second selection line, and whose second terminal is electrically connected to the second liquid crystal element and the second capacitor, the method for driving the liquid crystal display device, comprising the steps of: -
in a first period, turning on the first pixel transistor, turning off the second pixel transistor, turning off the third pixel transistor, and supplying a first image signal to the first liquid crystal element and the first capacitor from the first signal line; in a second period, performing display in the light-transmitting pixel portion in response to the first image signal supplied in the first period; in a third period, turning off the first pixel transistor, turning off the second pixel transistor, turning on the third pixel transistor, and supplying a signal for black display to the second liquid crystal element and the second capacitor from the second signal line in the reflective pixel portion; repeating the first to third periods so that a moving image is displayed; in a fourth period, turning on the first pixel transistor, turning on the second pixel transistor, turning off the third pixel transistor, and supplying a second image signal to the first liquid crystal element, the first capacitor, the second liquid crystal element, and the second capacitor from the first signal line; in a fifth period, performing display in the reflective pixel portion in response to the second image signal supplied in the fourth period; and repeating the fourth period and the fifth period so that a still image is displayed. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification