Gate signal line driving circuit for supressing noise in a gate signal in a display device
A gate signal line driving circuit which suppresses noises in a gate signal and a display device which uses the gate signal line driving circuit are provided. A first basic circuit provided to a gate signal line driving circuit includes a HIGH voltage applying switching element which applies a HIGH voltage to gate signal lines in response to a signal HIGH period, and a LOW voltage applying switching circuit which applies a LOW voltage to the gate signal lines in response to a signal LOW period. In response to a signal HIGH period, a switch of the LOW voltage applying switching circuit of the first basic circuit is turned off based on a signal applied to a switch of the HIGH voltage applying switching element of a second basic circuit which assumes a signal HIGH period earlier than the first basic circuit.
1. A gate signal line driving circuit comprising a plurality of basic circuits each of which outputs a gate signal having a HIGH voltage during a signal HIGH period and having a LOW voltage during a signal LOW period which is a period other than the signal HIGH period to a gate signal line, wherein
the plurality of basic circuits includes a first basic circuit, and a second basic circuit which assumes a signal HIGH period before the signal HIGH period of the first basic circuit, and
the first basic circuit and the second basic circuit respectively comprise:
a LOW voltage applying switching circuit which applies a LOW voltage to the gate signal line in response to the signal LOW period;
a HIGH voltage applying switching element which applies a HIGH voltage to the gate signal line in response to the signal HIGH period; and
a LOW voltage applying OFF control element which applies a LOW voltage to a switching input terminal of a switch of the LOW voltage applying switching circuit such that the switch of the LOW voltage applying switching circuit is turned off in response to the signal HIGH period, wherein
the LOW voltage applying OFF control element of the first basic circuit is turned on in response to an ON voltage applied to an internal voltage line, wherein the internal voltage line is directly connected between a control terminal of the LOW voltage applying OFF control element of the first basic circuit and a control terminal of the HIGH voltage applying switching element of the second basic circuit without directly connecting with the gate signal line.
2. The gate signal line driving circuit according to claim 1 , wherein in the first basic circuit, the HIGH voltage applying switching element is turned on after the switch of the LOW voltage applying switching circuit is turned off in response to the signal HIGH period.
3. The gate signal line driving circuit according to claim 2 , wherein in the first basic circuit, the LOW voltage applying switching circuit comprises a plurality of LOW voltage applying switching elements which are connected to the gate signal line parallel to each other, and apply a LOW voltage to the gate signal line in an ON state respectively, and
the plurality of LOW voltage applying switching elements are turned on and off respectively such that at least one of the LOW voltage applying switching elements is brought into an ON state in response to the signal LOW period, and at least one of the LOW voltage applying switching elements is brought into an OFF state within at least a section of the signal LOW period.
4. A display device provided with the gate signal line driving circuit according to claim 3 .
5. A display device provided with the gate signal line driving circuit according to claim 2 .
6. The gate signal line driving circuit according to claim 1 , wherein in the first basic circuit, the LOW voltage applying switching circuit comprises a plurality of LOW voltage applying switching elements which are connected to the gate signal line parallel to each other, apply a LOW voltage to the gate signal line in an ON state respectively, and
the plurality of LOW voltage applying switching elements are turned on and off respectively such that at least one of the LOW voltage applying switching elements is brought into an ON state in response to the signal LOW period, and at least one of the LOW voltage applying switching elements is brought into an OFF state within at least a section of the signal LOW period.
7. A display device provided with the gate signal line driving circuit according to claim 6 .
8. A display device provided with the gate signal line driving circuit according to claim 1 .
9. A gate signal line driving circuit according to claim 1 , wherein the internal voltage line is directly connected such that no wiring goes outside of the gate signal line driving circuit.