JPH06138851A - Active matrix liquid crystal display - Google Patents

Abstract

PURPOSE:To decrease the number of input terminals and the number of driving circuits by providing a switch on the input terminal side and charging data signals of signal lines through the operation of the switch, and requiring only one input terminal for plural signal lines. CONSTITUTION:The switch 7 consisting of a TFT is provided on the input terminal side of source electric conductors 3 (d1-d6), and every two electric conductors are connected to form source input terminals 4 (D1,2, D3,4, and D5,6). Then the switch 7 is controlled with switch control signals phiA and phiB of two phases inputted from switch selection terminals 8 and 9. Further, driving circuits for a data signal and an address signal are provided at a source input terminal 4 and a gate input terminal 2 respectively. Thus, the active matrix liquid crystal display is equipped with an active element constituting the switch 7 at the signal input terminal of its TFT substrate and plural input terminals are driven by one driving circuit on a time-division basic.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active matrix liquid crystal display, and more particularly to the structure of the peripheral portion of its TFT substrate.

[0002]

2. Description of the Related Art An equivalent circuit of a conventional active matrix liquid crystal display is shown in FIG. 3 and a drive signal timing chart is shown in FIG. A display data signal is applied to the source input terminal 4, and an address pulse 13 for turning on / off the TFT 5 is line-sequentially applied to the gate input terminal 2. This gate potential is at a high level (typically 2
(About 0 V), the TFT 5 is turned on and the data signal 14 applied to the source wiring 3 is displayed on the display electrode 15
Write in. In this way, the display electrode 15 and the counter electrode 1
The data signal 14 is stored in the liquid crystal capacitor 6 sandwiched between 6 (indicated as ground in FIG. 3), and the display operation is performed by controlling the alignment state of the liquid crystal molecules. The liquid crystal display panel is provided with a source input terminal 4 and a gate input terminal 2 corresponding to the source wiring 3 and the gate wiring 1, and a necessary driving signal is given from the driving IC.

[0003]

In this conventional active matrix liquid crystal display, the peripheral driving driver is externally mounted, which increases the cost of the driver.
In addition, in the high-definition display represented by EWS, HDTV, etc., the number of connection terminals becomes large, and the pitch between the terminals becomes narrow, so that the connection itself becomes very difficult. ing. For this reason, attempts have been made to simultaneously form peripheral circuits using polycrystalline silicon having high mobility, but it is difficult to obtain good characteristics and yield.

[0004]

The active matrix liquid crystal display of the present invention has an active element serving as a switch at a signal input end of its TFT substrate, and a plurality of input ends are time-division driven by one drive circuit. It is characterized by doing so.

[0005]

The present invention will be described below with reference to the drawings. FIG. 1 is an equivalent circuit diagram of an embodiment of the present invention. A switch 7 made of a TFT is provided on the input end side of the source wiring 3 (d _{1 to} d ₆ ), and two switches are connected to each other to connect the source input terminals 4 (D _1,2 , D _3,4 , D _5,6 ) Is formed.
Switch 7 is input from switch selection terminals 8 and 2
It is controlled by the phase switch control signals φA and φB.
The source input terminal 4 and the gate input terminal 2 are provided with drive circuits for data signals and address signals, respectively.

FIG. 2 is a timing chart when the circuit of FIG. 1 is operated. FIG. 2 shows signals related to the first and second lines of the source. Reference numeral 10 is a source input signal, and 13 is a gate address signal.

[0007]

As described above, according to the present invention, a switch is provided on the input end side, and by opening / closing the switch, the data signal of the signal line is charged, so that the input terminals of the plurality of signal lines are made one. Therefore, it is possible to reduce the number of input terminals and the number of drive circuits.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention.

FIG. 2 is a timing chart of signals for driving the liquid crystal panel shown in FIG.

FIG. 3 is a circuit diagram of a conventional active matrix liquid crystal display.

FIG. 4 is a drive signal timing chart of the circuit diagram shown in FIG.

[Explanation of symbols]

 1 gate wiring 2 gate input terminal 3 source wiring 4 source input terminal 5 TFT 6 liquid crystal capacitor 7 switch (TFT) 8, 9 switch selection terminal 15 display electrode 16 counter electrode

Claims (2)

[Claims] 1. An active matrix liquid crystal display using a TFT, wherein an active element serving as a switch is provided between a signal input terminal of a TFT substrate and a signal wiring. 2. The active matrix liquid crystal display according to claim 1, wherein a plurality of signal line input terminals each having a switch are coupled to each other.