Scanning-line drive circuit
a technology of drive circuit and scanning line, which is applied in the direction of pulse technique, electrical analogue stores, instruments, etc., can solve the problems of increasing the cost of the device, and achieve the effect of reducing the area of the substrate and reducing the manufacturing cos
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embodiment 1
Preferred Embodiment 1
[0070]FIG. 1 is a block diagram schematically showing a configuration of a display device according to the present invention. FIG. 1 shows an overall configuration of a liquid crystal display device as a typical example of the display device. Application of the present invention is not limited to the liquid crystal display device, and the present invention can be widely applied to electro-optical devices including a display device which converts an electrical signal into a light brightness, as exemplified by an electro-luminescence (EL), an organic EL, a plasma display, and an electronic paper, and an imaging device (image sensor) which converts a light intensity into an electrical signal.
[0071]A liquid crystal display device 100 includes a liquid crystal array section 10, a gate-line drive circuit (scanning-line drive circuit) 30, and a source driver 40. A shift register according to a preferred embodiment of the present invention is mounted in the gate-line d...
embodiment 2
Preferred Embodiment 2
[0150]In a preferred embodiment 2, the present invention is applied to a shift register in which a signal shift direction is changeable. The gate-line drive circuit 30 configured with such a shift register is capable of bi-directional scanning. Here, an operation for shifting a signal in a direction from the immediately preceding stage to the subsequent stage (in the order of unit shift registers SR1, SR2, SR3, . . . ) is defined as a “forward-direction shift”, and an operation for shifting a signal in a direction from the subsequent stage to the immediately preceding stage (in the order of unit shift registers SRn, SRn−1, SRn−2, . . . ) is defined as a “reverse-direction shift”.
[0151]FIG. 11 is a block diagram showing a configuration of the gate-line drive circuit 30 according to the preferred embodiment 2. This gate-line drive circuit 30 includes the unit shift registers (bi-directional unit shift registers) SR1, SR2, SR3, . . . SRn capable of bi-directional ...
embodiment 3
Preferred Embodiment 3
[0209]The bi-directional unit shift register shown in FIG. 12 can also be driven by using two-phase clock signals. However, in the preferred embodiment 2, the gate-line drive circuit 30 is driven by using the three-phase clock signals CLK1 to CLK3, because at least three-phase clock signals are required for controlling the unit shift register SR1 of the most preceding stage and the unit shift register SRn of the last stage. In this preferred embodiment, proposed is a gate-line drive circuit 30 capable of bi-directional shifting which requires no start pulse and can be operated by using two-phase clock signals.
[0210]FIG. 28 is a block diagram of a gate-line drive circuit according to a preferred embodiment 3. The clock signal generator 31 of this preferred embodiment generates two-phase clock signals CLK, / CLK having different phases, and one of them is inputted to the clock terminal CK of each unit shift register SR. In an example shown in FIG. 28, the clock si...
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