Display driver, electro-optic device, and drive method

1. A display driver that drives a display panel by a multi-line drive system for selecting a plurality of scan lines simultaneously, comprising:

at least one code generator, which has a linear feedback shift register, and generates pseudo random number sequences with the linear feedback shift register;

a signal generator that receives random number sequences output by K taps (K being an integer that is two or more) of the linear feedback shift register included in the at least one code generator, and generates field selection signals that randomly vary field selection sequences based on the random number sequences; and

a scan driver that outputs scan signals corresponding to the fields selected by the field selection signals to scan lines, and selectively drives the scan lines.

2. The display driver according to claim 1 , wherein the signal generator generates the field selection signals based on random number sequences output by K taps of the linear feedback shift register of the code generator.

3. The display driver according to claim 2 , wherein the signal generator generates the field selection signals based on random number sequences output by the taps of K registers, which are adjacent each other and compose the linear feedback shift register.

4. The display driver according to claim 1 , wherein the signal generator generates the field selection signals based on random number sequences output by K taps of the linear feedback shift registers of a plurality of code generators.

5. The display driver according to claim 1 , wherein the load value is set to the signal generator by K bits of data with each bit configured based on random number sequences from K taps, and the signal generator includes a field counter, which increments or decrements a count value from the load value, and resets the count value to an opposite upper or lower limit value, when the count value reaches an upper limit value or a lower limit value, and generates field selection signals that correspond to the count value of the field counter.

6. The display driver according to claim 1 , wherein the code generator further comprises a generator that generates random number sequences of M-sequences.

7. An electro-optic device, comprising:

the display driver according to claim 1 ; and

a display panel that is driven by the display driver.

8. A method for driving a display panel by a multi-line drive method that selects a plurality of scan lines simultaneously, comprising:

generating pseudo random number sequences by a linear feedback shift register of at least one code generator;

generating field selection signals that randomly vary field selection sequences based on random number sequences output by K taps (K being an integer that is two or more) of the linear feedback shift register included in the at least one code generator;

outputting scan signals corresponding to the fields selected by the generated field selection signals to the scan lines; and

driving the scan lines selectively.

9. The drive method according to claim 8 , wherein the field selection signals are generated based on random number sequences output by K taps of a linear feedback shift register included in one code generator.

10. The drive method according to claim 8 , wherein the field selection signals are generated based on random number sequences output by K taps of linear feedback shift registers included in a plurality of code generators.

11. The drive method according to claim 8 , comprising:

setting K bits of data with each bit configured based on the random number sequences from K taps as the load value for a field counter;

incrementing or decrementing a count value of the field counter from the load value;

resetting the count value to the opposite upper or lower limit value, when the count value reaches an upper limit value or a lower limit value; and

generating field selection signals that correspond to the count value of the field counter.