DISPLAY DRIVER IC HAVING EMBEDDED DRAM

1 . A display driver IC for controlling display of an image on a display panel, comprising:

a DRAM in which digital data corresponding to said image is stored;

a power supply circuit configured to generate a predetermined voltage; and

a driver circuit configured to convert said digital data into a gray-scale voltage by using said predetermined voltage and to output said gray-scale voltage to said display panel,

wherein electric power is supplied to said DRAM from said power supply circuit.

2 . The display driver IC according to claim 1 ,

wherein said power supply circuit includes:

a positive voltage power supply configured to generate a positive voltage; and

a negative voltage power supply configured to generate a negative voltage,

wherein said driver circuit converts said digital data into said gray-scale voltage by using a voltage range defined by said positive voltage and said negative voltage,

wherein said DRAM uses at least one of said positive voltage power supply and said negative voltage power supply as a power supply.

3 . The display driver IC according to claim 2 ,

wherein said DRAM uses both of said positive voltage power supply and said negative voltage power supply as a power supply.

4 . The display driver IC according to claim 1 ,

wherein said DRAM is configured to operate with not only a power supply voltage and a ground voltage that are supplied from an external power supply but also an operation voltage other than said power supply voltage and said ground voltage,

wherein said operation voltage is generated from said predetermined voltage output by said power supply circuit.

5 . The display driver IC according to claim 1 ,

wherein said DRAM does not include a voltage generation circuit that boosts or lowers a voltage.

6 . The display driver IC according to claim 1 ,

wherein a memory cell of said DRAM has a first transistor and said driver circuit has a second transistor configured to output said gray-scale voltage,

wherein a breakdown voltage of said first transistor is equal to a breakdown voltage of said second transistor.

7 . The display driver IC according to claim 6 ,

wherein said first transistor has a same structure as said second transistor.

8 . A display driver IC for controlling display of an image on a display panel, comprising:

a DRAM in which digital data corresponding to said image is stored; and

a driver circuit configured to convert said digital data into a gray-scale voltage and to output said gray-scale voltage to said display panel,

wherein said DRAM operates only with positive voltages and a ground voltage.

9 . The display driver IC according to claim 8 ,

wherein a memory cell of said DRAM has a first transistor and said driver circuit has a second transistor configured to output said gray-scale voltage,

wherein said first transistor has a same structure as said second transistor.

10 . The display driver IC according to claim 8 , further comprising a power supply circuit configured to generate a predetermined voltage,

wherein said driver circuit converts said digital data into said gray-scale voltage by using said predetermined voltage,

wherein electric power is supplied to said DRAM from said power supply circuit.

11 . The display driver IC according to claim 10 ,

wherein said positive voltages include not only a power supply voltage supplied from an external power supply but also a positive operation voltage that is different from said power supply voltage,

wherein said positive operation voltage is generated from said predetermined voltage output by said power supply circuit.

12 . The display driver IC according to claim 10 ,

wherein said DRAM does not include a voltage generation circuit that boosts or lowers a voltage.