Display driver circuit, display panel, display device, and display drive method
AssigneeSeiko Epson Corporation
InventorAkira Morita
Life of this patent
Estimating the term…
Abstract
A signal driver IC (or a display driver circuit in a broad sense) includes a signal electrode driver circuit which drives a signal electrode by using grayscale data. The signal electrode driver circuit has a precharge circuit, a DAC circuit, and a drive voltage adjusting circuit. The precharge circuit sets an output electrode connected to the signal electrode at a precharge voltage in a first stage which is a first period within one horizontal scanning period. In a second stage subsequent to the first stage, the DAC circuit sets the output electrode at a reference voltage based on the grayscale data. In a third stage subsequent to the second stage, the drive voltage adjusting circuit adjusts the voltage of the output electrode by using the grayscale data.
Claims18
A display driver circuit for driving a signal electrode based on grayscale data of (a+b) bits (a and b are positive integers), the display driver circuit comprising:
- a precharge circuit which sets an output electrode electrically connected to the signal electrode at a precharge voltage in a first period within a drive period;
- a voltage select circuit which sets the output electrode which has been set at the precharge voltage at a reference voltage based on the grayscale data;
- and
- a drive voltage adjusting circuit which adjusts a voltage of the output electrode by using the grayscale data, the output voltage having been set at the reference voltage, wherein:
- the drive voltage adjusting circuit includes a first transistor and a second transistor;
- a source terminal and a drain terminal of the first transistor are respectively connected to a first power supply line to which a first power supply voltage is supplied and the output electrode;
- a source terminal and a drain terminal of the second transistor are respectively connected to a second power supply line to which a second power supply voltage is supplied and the output electrode;
- and
- a gate signal is applied to a gate electrode of one of the first and second transistors, the gate signal having a pulse width determined based on low order “b” bit(s) or the low order “b” bit(s) and at least part of high order “a” bit(s) in the grayscale data of (a+b) bits.
A display driver circuit for driving a signal electrode based on grayscale data of (a+b) bits (a and b are positive integers), the display driver circuit compnsing:
- a precharge circuit which sets an output electrode electrically connected to the signal electrode at a precharge voltage in a first period within a drive period;
- a voltage select circuit which sets the output electrode which has been set at the precharge voltage at a reference voltage based on the grayscale data;
- and
- a drive voltage adjusting circuit which adjusts a voltage of the output electrode by using the grayscale data, the output voltage having been set at the reference voltage, wherein:
- the voltage select circuit sets the output electrode at the reference voltage based on high order “a” bit(s) in the grayscale data of (a+b) bits;
- the drive voltage adjusting circuit includes a first transistor and a second transistor;
- a source terminal and a drain terminal of the first transistor are respectively connected to a first power supply line to which a first power supply voltage is supplied and the output electrode;
- a source terminal and a drain terminal of the second transistor are respectively connected to a second power supply line to which a second power supply voltage is supplied and the output electrode;
- and
- a gate signal is applied to a gate electrode of one of the first and second transistors, the gate signal having a pulse width determined based on low order “b” bit(s) or the low order “b” bit(s) and at least part of high order “a” bit(s) in the grayscale data of(a+b) bits.
A display drive method for driving a signal electrode based on grayscale data of (a+b) bits (a and b are positive integers), the display drive method comprising:
- setting an output electrode electrically connected to the signal electrode at a precharge voltage in a first period within a drive period;
- setting the output electrode which has been set at the precharge voltage at a reference voltage based on the grayscale data;
- and
- adjusting a voltage of the output electrode by using the grayscale data, the output electrode having been set at the reference voltage, wherein:
- a first power supply voltage and a second power supply voltage are respectively supplied to a first power supply line and a second power supply line;
- and
- one of the first and second power supply lines is electrically connected to the output electrode which has been set at the reference voltage during a period of a pulse width determined based on low order “b” bit(s) or the low order “b” bit(s) and at least part of high order “a” bit(s) in the grayscale data of (a+b) bits.
A display drive method for driving a signal electrode based on grayscale data of (a+b) bits (a and b are positive integers), the display drive method comprising:
- setting an output electrode electrically connected to the signal electrode at a precharge voltage in a first period within a drive period;
- setting the output electrode which has been set at the precharge voltage at a reference voltage based on the grayscale data;
- adjusting a voltage of the output electrode by using the grayscale data, the output electrode having been set at the reference voltage, wherein
- the output electrode is set at the reference voltage based on high order “a” bit(s) in the grayscale data of (a+b) bits, and wherein
- a first power supply voltage and a second power supply voltage are respectively supplied to a first power supply line and a second power supply line;
- and
- one of the first and second power supply lines is electrically connected to the output electrode which has been set at the reference voltage during a period of a pulse width determined based on low order “b” bit(s) or the low order “b” bit(s) and at least part of high order “a” bit(s) in the grayscale data of (a+b) bits.
Dependencies are inferred from the claim text.