Voltage adjustment circuit and display device driving circuit
A voltage adjustment circuit for adjusting a voltage to be supplied to scanning lines of a display device includes a slope adjustment circuit configured to adjust a slope of a decrease in the voltage based on data that is externally input, and a clamp voltage adjustment circuit configured to adjust a voltage value at which the voltage is clamped based on the data.
1. A voltage adjustment circuit for adjusting a voltage to be supplied to scanning lines of a display device, the voltage adjustment circuit comprising:
a slope adjustment circuit configured to adjust a slope of a decrease in the voltage based on data that is externally input;
a clamp voltage adjustment circuit configured to adjust a voltage value at which the voltage is clamped based on the data; and
a delay setting circuit configured to set a time period until the decrease in the voltage starts based on the data,
wherein the delay setting circuit comprises: a second capacitor configured to be charged with constant current; a Digital-to-Analog converter configured to convert the data into an analog voltage; a comparator configured to compare the charged voltage of the second capacitor with the analog voltage; and a logic circuit configured to generate a trigger that causes a decrease in the voltage to be started based on an output signal of the comparator.
2. The voltage adjustment circuit according to claim 1 , wherein the slope adjustment circuit comprises: a first capacitor; a charging current adjustment circuit configured to adjust charging current to be supplied to the first capacitor; and an output circuit configured to output, as the voltage, a voltage corresponding to a charged voltage of the first capacitor.
3. The voltage adjustment circuit according to claim 1 , wherein the clamp voltage adjustment circuit comprises a resistance adjustment circuit configured to adjust a combined resistance between an output terminal and a power supply based on the data.
4. A display device comprising:
scanning lines;
a gate driver configured to drive the scanning lines; and
a voltage adjustment circuit configured to adjust a voltage to be supplied to the gate driver, wherein the voltage adjustment circuit comprises:
a slope adjustment circuit configured to adjust a slope of a decrease in the voltage based on data that is externally input;
a clamp voltage adjustment circuit configured to adjust a voltage value at which the voltage is clamped based on the data; and
a delay setting circuit configured to set a time period until the decrease in the voltage starts based on the data,
wherein the delay setting circuit comprises: a second capacitor configured to be charged with constant current; a Digital-to-Analog converter configured to convert the data into an analog voltage; a comparator configured to compare the charged voltage of the second capacitor with the analog voltage; and a logic circuit configured to generate a trigger that causes a decrease in the voltage to be started based on an output signal of the comparator.