Electro-optical panel controlling driving sequences in demultiplex driving
A circuit device includes: a selection signal output circuit configured to output a selection signal based on first to fourth driving sequences in demultiplex driving, and a data line driving circuit configured to output first to fourth data signals to a data signal supply line in order of the first to fourth driving sequences. In the first driving sequence, the selection signal output circuit activates an i-th selection signal, and the data line driving circuit outputs an i-th data signal to an i-th data line. At this stage of operation, after the first to fourth driving sequences, a rewriting operation in which the selection signal output circuit activates the i-th selection signal, and the data line driving circuit outputs the i-th data signal to the i-th data line is performed.
1. A circuit device comprising:
a selection signal output circuit configured to output first to n-th selection signals, for controlling electrically connecting first to n-th data lines of an electro-optical panel and a data signal supply line of the electro-optical panel based on first to n-th driving sequences in demultiplex driving, to a switching circuit disposed between the first to n-th data lines and the data signal supply line, n being an integer equal to or more than 3; and
a data line driving circuit configured to output first to n-th data signals corresponding to the first to n-th data lines to the data signal supply line in order of the first to n-th driving sequences, wherein
in the first driving sequence among the first to n-th driving sequences, the selection signal output circuit activates an i-th selection signal among the first to n-th selection signals, and the data line driving circuit outputs an i-th data signal among the first to n-th data signals to an i-th data line among the first to n-th data lines, i being an integer not less than 1 and not greater than n,
after the first to n-th driving sequences, a rewriting operation in which the selection signal output circuit activates the i-th selection signal, and the data line driving circuit outputs the i-th data signal to the i-th data line is performed,
in the second driving sequence among the first to n-th driving sequences, the selection signal output circuit activates a j-th selection signal among the first to n-th selection signals, and the data line driving circuit writes a j-th data signal among the first to n-th data signals in a j-th data line among the first to n-th data lines, j being an integer not less than 1 and not greater than n, j being not equal to i,
after the first to n-th driving sequences, the rewriting operation in which the selection signal output circuit activates the j-th selection signal, and the data line driving circuit outputs the j-th data signal to the j-th data line is performed,
the rewriting operation includes a rewriting operation in an n+1-th driving sequence and a rewriting operation in an n+2-th driving sequence after the first to n-th driving sequences, and
in the n+1-th driving sequence, the selection signal output circuit activates the j-th selection signal, and the data line driving circuit rewrites the j-th data signal in the j-th data line, and in the n+2-th driving sequence, the selection signal output circuit activates the i-th selection signal, and the data line driving circuit rewrites the i-th data signal in the i-th data line.
2. The circuit device according to claim 1 , wherein
in a pre-charge period before the first to n-th driving sequences, the selection signal output circuit activates the first to n-th selection signals, and the data line driving circuit outputs a pre-charge voltage to the first to n-th data lines.
3. The circuit device according to claim 2 , wherein
the pre-charge voltage is a negative polarity voltage in polarity inversion driving, and
the selection signal output circuit and the data line driving circuit perform the rewriting operation in a positive polarity driving period in the polarity inversion driving.
4. The circuit device according to claim 3 , wherein
in a negative polarity driving period in the polarity inversion driving, the rewriting operation is disabled.
5. The circuit device according to claim 1 , comprising a register configured to store an enable signal for the rewriting operation, and
when the enable signal stored in the register indicates enabling of the rewriting operation, the selection signal output circuit and the data line driving circuit perform the rewriting operation.
6. The circuit device according to claim 1 , comprising a multiplexing circuit configured to multiplex first to n-th pixel data corresponding to the first to n-th data signals in the first to n-th driving sequences, and to further multiplex an i-th pixel data among the first to n-th pixel data after the first to n-th driving sequences, and
the data line driving circuit comprises:
a D/A converter circuit configured to perform D/A conversion of output data of the multiplexing circuit; and
an amplifier circuit configured to output an output signal of the D/A converter circuit to the data signal supply line after buffering or amplifying the output signal of the D/A converter circuit.
7. An electro-optical device comprising:
the circuit device; and
the electro-optical panel according to claim 1 .