Display apparatus and driving device for displaying

1. A display driving circuit to supply a gray scale voltage corresponding to display data to a display panel, the display driving circuit comprising:

a generation circuit to divide a reference voltage to generate a plurality of levels of the gray scale voltages;

an interface circuit;

a selection circuit to select the gray scale voltage corresponding to the display data from the plurality of levels of voltages;

a first register to store a setting value that adjusts the amplitude of a gamma characteristic curve from outside via the interface circuit; and

a second register to store a setting value that adjusts the gradient of the gamma characteristic curve from outside via the interface circuit; and

a third register to store a setting value for micro adjusting the gamma characteristic curve from outside via the interface circuit;

wherein the first, second and third registers are assigned different addresses.

2. A display driving circuit according to claim 1 ,

wherein the respective setting values of the first, second and third registers can be set separately in accordance with a polarity of the gray scale voltage.

3. A display driving circuit according to claim 1 ,

wherein the respective setting values of the first, second and third registers can be set separately in accordance with colors of red, green and blue respectively.

4. A display driving circuit according to claim 1 ,

wherein the display panel contains a backlight illuminating display pixels, the respective setting values of the first, second and third registers can be set separately in accordance with a state of the backlight.

5. A display device, comprising:

the driving circuit according to claim 1 ;

a processing unit, connected with the interface circuit of the display driving circuit, and supplying the display data, the respective addresses and setting values of the first to third registers to the display driving circuit; and

the display panel connected with the display driving circuit.

6. A display driving circuit to supply a gray scale voltage corresponding to display data to a display panel, the display driving circuit comprising:

a generation circuit to divide between a first level voltage and a second level voltage by a group of resistive circuits, a variable resistor and a selector circuit to generate a plurality of levels of voltages;

a decoder circuit to decode the gray scale voltage corresponding to the display data among the plurality of levels of voltages; and

registers which is capable of setting the resistance values of the variable resisters and based on a selected position of the selector circuit to adjust the amplitude and gradient of a characteristic curve of the gray scale voltages and micro adjust the gradient of the characteristic curve of the gray scale voltages with respect to the gray scale number, and

an interface circuit;

where the registers include:

a first register which is capable of setting a resistive value of the variable resister for setting the amplitude of the characteristic curve from outside via the interface circuit;

a second register which is capable of setting a resistive value of the variable resistor for setting the gradient of the characteristic curve from outside via the interface circuit; and

a third register which is capable of setting a value for setting a selected position of the selector circuit to micro-adjust the gradient of the characteristic curve from outside via the interface circuit,

wherein the first, second and third registers are assigned different addresses.

7. A display driving circuit according to claim 6 ,

wherein the respective setting values of the first, second and third registers can be set separately in accordance with a polarity of the gray scale voltage.

8. A display driving circuit according to claim 6 ,

wherein the respective setting values of the first, second and third registers can be set separately in accordance with colors of red, green and blue respectively.

9. A display driving circuit according to claim 6 ,

wherein the display panel contains a backlight illuminating display pixels, where the respective setting values of the first, second and third registers can be set separately in accordance with a state of the backlight.

10. A display device, comprising:

the driving circuit according to claim 6 ;

a processing unit, connected with the interface circuit of the display driving circuit, and supplying the display data, the respective addresses and setting values of the first to third registers to the display driving circuit; and

the display panel connected with the display driving circuit.

11. A display driving circuit to supply a gray scale voltage corresponding to display data to a display panel in which a plurality of pixels are arranged, the display driving circuit comprising:

a generation circuit to divide a reference voltage to generate a plurality of levels of voltages corresponding to a plurality of gray scales;

a decoder circuit to select the gray scale voltage corresponding to the display data among the plurality of levels of voltages;

a first register which is set with a first value for the reference voltage dividing ratio to adjust the amplitude of a gamma characteristics determining the relationship between the gray scales and the gray scale voltages or the brightness in the display panel;

a second register which is set with a second value for the reference voltage dividing ratio to adjust the gradient of the middle part of the hi characteristics;

a third register which is set with a third value for the reference voltage dividing ratio to micro adjust the middle part of the gamma characteristics respect to each gray scale.

12. A display driving circuit according to claim 11 ,

wherein the values of the first to third registers can be set separately from outside.

13. A display driving circuit according to claim 12 ,

wherein the generation circuit comprise:

a first resistance ladder which is connected between a terminal of a first reference voltage and a terminal of a second reference voltage;

a first variable resistor which is connected with the first resistance ladder in series, being closer to the side of the terminal of first reference voltage or the terminal of second reference voltage;

a second variable resistor which is connected with the first resistance ladder in series, being in the middle of the first resistance ladder;

a selector to select the output of the first resistance ladder;

an amplifier which is connected with the output side of the selector; and

a second resistance ladder connected among the plurality of output of the amplifier,

wherein the resistive value of the first variable resistor can vary in accordance with the first value in the first register,

wherein the resistive value of the second variable resistor can vary in accordance with the second value in the second register, and

wherein the selector can select the output of the first resistance ladder in accordance with the third value in the third register.

14. A display driving circuit according to claim 11 ,

wherein the respective setting values of the first, second and third registers can be set separately in accordance with a polarity of the gray scale voltage.

15. A display driving circuit according to claim 11 ,

wherein the respective setting values of the first, second and third registers can be set separately in accordance with colors of red, green and blue respectively.

16. A display driving circuit according to claim 11 ,

wherein the display panel contains a backlight illuminating display pixels, and

wherein the respective setting values of the first, second and third registers can be set separately in accordance with a state of the backlight.

17. A display device, comprising:

the driving circuit according to claim 11 ;

a processing unit, connected with the display driving circuit, and

supplying the display data, the first value to be set to the first register, the second value to be set to the second register and the third value to be set to the third register, to the display driving circuit; and

the display panel connected with the display driving circuit.