Driving circuit having compensative unit for providing compensative voltages to data driving circuits based on voltages of two nodes of gate line, method for making same, and liquid crystal panel with same

1. A driving circuit comprising:

a plurality of parallel gate lines;

a plurality of parallel data lines orthogonal to the gate lines;

a plurality of pixel electrodes;

a plurality of thin film transistors, each of the thin film transistors positioned near a crossing of a corresponding gate line and a corresponding data line, each of the thin film transistors comprising a gate electrode coupled to the corresponding gate line, a source electrode coupled to the corresponding data line, and a drain electrode coupled to a corresponding one of the pixel electrodes;

a plurality of gate driving circuits for driving the gate lines;

a plurality of data driving circuits for driving the data lines; and

a compensative unit having a first input terminal, a second input terminal, and a plurality of output terminals coupled to the data driving circuits, respectively;

wherein the first and second input terminals are coupled to two nodes of one of the gate lines, the two nodes are coupled to two gate electrodes of two of the thin film transistors respectively connected to a selected two of the data driving circuits, and the compensative unit outputs a plurality of compensative voltages for compensating data voltage signals outputted by the data driving circuits, according to delays of two scanning signals received from the first and second input terminals, respectively,

wherein the two nodes are a node “ 1 ” and a node “ 2 ”, and the compensative voltage is expressed by the following equation:

V pi =( i −1) V s , ( i =1, 2, 3 . . . j ),

where V pi represents a compensative voltage transmitted to an ith data driving circuit, j represents a number of data driving circuits, V s represents a unit compensative voltage, which is expressed by the equation:

V

s

″

=

K

″

⁡

(

∫

t

⁢

⁢

0

″

t

⁢

⁢

2

″

⁢

V

2

⁢

ⅆ

t

-

∫

t

⁢

⁢

0

″

t

⁢

⁢

1

″

⁢

V

1

⁢

⁢

ⅆ

t

)

K

2

-

K

1

,

⁢

(

K

1

=

1

,

2

,

3

⁢

⁢

…

⁢

⁢

j

-

1

,

K

2

=

2

,

3

⁢

⁢

…

⁢

⁢

j

,

K

2

>

K

1

)

,

where t 0 represents a time of reversing of data voltage signals transmitted to the two thin film transistors with gate electrodes coupled to the nodes “ 1 ” and “ 2 ” respectively, t 1 represents a time of shutting off of the thin film transistor with the gate electrode coupled to the node “ 1 ”, t 2 represents a time of shutting off of the thin film transistor with the gate electrode coupled to the node “ 2 ”, V 1 represents an instant voltage of the node “ 1 ” during a time period from t 0 to t 1 , V 2 represents an instant voltage of the node “ 2 ” during a time period from t 0 to t 2 , K represents an adjusting constant, K 1 represents a number of data driving circuits corresponding to the node “ 1 ”, and K 2 represents a number of data driving circuit corresponding to the node “ 2 ”.

2. The driving circuit as claimed in claim 1 , wherein the first input terminal is coupled to a gate electrode of a the thin film transistor that is nearest to the gate driving circuits, which is coupled to a corresponding data driving circuit; and the second input terminal is coupled to a gate electrode of another thin film transistor that is farthest to the gate driving circuits, which is coupled to another corresponding data driving circuit.

3. The driving circuit as claimed in claim l, further comprising a plurality of common electrodes, the pixel electrode and the common electrodes cooperatively forming a plurality of storage capacitors.

4. The driving circuit as claimed in claim 1 , wherein the first input terminal is coupled to a gate electrode of a thin film transistor that is nearest to the gate driving circuits, the thin film transistor is coupled to a first data driving circuit; and the second input terminal is coupled to a gate electrode of a thin film transistor coupled to a second data driving circuit next to the first data driving circuit, the thin film transistor is nearest to the gate driving circuits compared with other thin film transistors coupled to the second data driving circuit.

5. A liquid crystal display panel, comprising:

a first substrate;

a second substrate opposite to the first substrate;

a liquid crystal layer interposed between the first and second substrates; and

a driving circuit for driving the liquid crystal panel, the driving circuit comprising:

a plurality of gate lines;

a plurality of data lines orthogonal and isolative to the gate lines;

a plurality of pixel electrodes;

a plurality of thin film transistors, each of the thin film transistors positioned near a crossing of a corresponding gate line and a corresponding data line, each of the thin film transistors comprising a gate electrode coupled to the corresponding gate line, a source electrode coupled to the corresponding data line, and a drain electrode coupled to a corresponding one of the pixel electrodes;

a plurality of gate driving circuits for driving the gate lines;

a plurality of data driving circuits for driving the data lines; and

a compensative unit having a first input terminal, a second input terminal, and a plurality of output terminals coupled to the data driving circuits, respectively;

wherein the first and second input terminals are coupled to two nodes of one of the gate lines, the two nodes are coupled to two gate electrodes of two of the thin film transistors respectively connected to a selected two of the data driving circuits, and the compensative unit outputs a plurality of compensative voltages for compensating data voltage signals outputted by the data driving circuits, according to delays of two scanning signals received from the first and second input terminals, respectively,

wherein the two nodes are a node “ 1 ” and a node “ 2 ”, and the compensative voltage is expressed by the following equation:

V pi =( i 31 1) V s , ( i =1, 2, 3 . . . j ),

where V pi represents a compensative voltage transmitted to an ith data driving circuit, j represents a number of data driving circuits, V s represents a unit compensative voltage, which is expressed by the equation:

V

s

″

=

K

″

⁡

(

∫

t

⁢

⁢

0

″

t

⁢

⁢

2

″

⁢

V

2

⁢

⁢

ⅆ

t

-

∫

t

⁢

⁢

0

″

t

⁢

⁢

1

″

⁢

V

1

⁢

⁢

ⅆ

t

)

K

2

-

K

1

,

⁢

(

K

1

=

1

,

2

,

3

⁢

⁢

…

⁢

⁢

j

-

1

,

K

2

=

2

,

3

⁢

⁢

…

⁢

⁢

j

,

K

2

>

K

1

)

,

where t 0 represents a time of reversing of data voltage signals transmitted to the two thin film transistors with gate electrodes coupled to the nodes “ 1 ” and “ 2 ” respectively, t 1 represents a time of shutting off of the thin film transistor with the gate electrode coupled to the node “ 1 ”, t 2 represents a time of shutting off of the thin film transistor with the gate electrode coupled to the node “ 2 ”, V 1 represents an instant voltage of the node “ 1 ” during a time period from t 0 to t 1 , V 2 represents an instant voltage of the node “ 2 ” during a time period from t 0 to t 2 , K represents an adjusting constant, K 1 represents a number of data driving circuits corresponding to the node “ 1 ”, and K 2 represents a number of data driving circuit corresponding to the node “ 2 ”.

6. The liquid crystal display panel as claimed in claim 5 , wherein the first input terminal is coupled to a gate electrode of a the thin film transistor that is nearest to the gate driving circuits, which is coupled to a corresponding data driving circuit; and the second input terminal is coupled to a gate electrode of another thin film transistor that is farthest to the gate driving circuits, which is coupled to another corresponding data driving circuit.

7. The liquid crystal display panel as claimed in claim 5 , further comprising a plurality of common electrodes, the pixel electrode and the common electrodes cooperatively forming a plurality of storage capacitors.

8. The liquid crystal display panel as claimed in claim 5 , wherein the first input terminal is coupled to a gate electrode of a thin film transistor that is nearest to the gate driving circuits, the thin film transistor is coupled to a first data driving circuit; and the second input terminal is coupled to a gate electrode of a thin film transistor coupled to a second data driving circuit next to the first data driving circuit, the thin film transistor is nearest to the gate driving circuits compared with other thin film transistors coupled to the second data driving circuit.

9. A method of making a driving circuit comprising steps of:

providing a plurality of parallel gate lines;

providing a plurality of parallel data lines orthogonal to the gate lines;

providing a plurality of pixel electrodes; . providing a plurality of thin film transistors, each of the thin film transistors positioned near a crossing of a corresponding gate line and a corresponding data line, each of the thin film transistors comprising a gate electrode coupled to the corresponding gate line, a source electrode coupled to the corresponding data line, and a drain electrode coupled to a corresponding one of the pixel electrodes;

providing a plurality of gate driving circuits for driving the gate lines; providing ga plurality of data driving circuits for driving the data lines; and

providing a compensative unit having a first input terminal, a second input terminal, and a plurality of output terminals coupled to the data driving circuits, respectively;

wherein the first and second input terminals are coupled to two nodes of one of the gate lines, the two nodes are coupled to two gate electrodes of two of the thin film transistors respectively connected to selected two of the data driving circuits, and the compensative unit outputs a plurality of compensative voltages for compensating data voltage signals outputted by the data driving circuits, according to delays of two scanning signals received from the first and second input terminals, respectively,

wherein the two nodes are a node “ 1 ” and a node “ 2 ”, and the compensative voltage is expressed by the following equation:

V pi =( i 31 1) V s , ( i =1, 2, 3 . . . j ),

where V pi represents a compensative voltage transmitted to an ith data driving circuit, j represents a number of data driving circuits, V s represents a unit compensative voltage, which is expressed by the equation:

V

s

″

=

K

″

⁡

(

∫

t

⁢

⁢

0

″

t

⁢

⁢

2

″

⁢

V

2

⁢

⁢

ⅆ

t

-

∫

t

⁢

⁢

0

″

t

⁢

⁢

1

″

⁢

V

1

⁢

⁢

ⅆ

t

)

K

2

-

K

1

,

⁢

(

K

1

=

1

,

2

,

3

⁢

⁢

…

⁢

⁢

j

-

1

,

K

2

=

2

,

3

⁢

⁢

…

⁢

⁢

j

,

K

2

>

K

1

)

,

where t 0 represents a time of reversing of data voltage signals transmitted to the two thin film transistors with gate electrodes coupled to the nodes “ 1 ” and “ 2 ” respectively, t 1 represents a time of shutting of of the thin film transistor with the gate electrode coupled to the node “ 1 ”, t 2 represents a time of shutting off of the thin film transistor with the gate electrode coupled to the node “ 2 ”, V 1 represents an instant voltage of the node “ 1 ” during a time period from t 0 to t 1 , V 2 represents an instant voltage of the node “ 2 ” during a time period from t 0 to t 2 , K represents an adjusting constant, K 1 represents a number of data driving circuits corresponding to the node “ 1 ”, and K 2 represents a number of data driving circuit corresponding to the node “ 2 ”.

10. The method as claimed in claim 9 , wherein the first input terminal is coupled to a gate electrode of a the thin film transistor that is nearest to the gate driving circuits, which is coupled to a corresponding data driving circuit; and the second input terminal is coupled to a gate electrode of another thin film transistor that is farthest to the gate driving circuits, which is coupled to another corresponding data driving circuit.

11. The method as claimed in claim 9 , wherein the first input terminal is coupled to a gate electrode of a thin film transistor that is nearest to the gate driving circuits, the thin film transistor is coupled to a first data driving circuit; and the second input terminal is coupled to a gate electrode of a thin film transistor coupled to a second data driving circuit next to the first data driving circuit, the thin film transistor is nearest to the gate driving circuits compared with other thin film transistors coupled to the second data driving circuit.