Display device including pixel circuits including display elements driven by electric current
An object of the disclosure is to achieve a stable display quality without an effect of variation in temperature in a display device including a display element driven by an electric current. The display device is provided with a thermistor as a temperature detector detecting an ambient temperature. A scanning signal amplitude controller changes the voltage level of a gate low voltage in accordance with temperature indicated by temperature data acquired by the thermistor. An in-panel driver controller gives, to a gate driver, a gate clock signal of which the voltage level on a high level side is set at the voltage level of a gate high voltage and the voltage level on a low level side is set at the voltage level of the gate low voltage. The gate driver outputs a scanning signal on the basis of the gate clock signal.
1. A display device including a display panel including a plurality of data lines, a plurality of scanning signal lines intersecting with the plurality of data lines, and a plurality of pixel circuits corresponding to intersections between the plurality of data lines and the plurality of scanning signal lines, the display device comprising:
a data line driver that applies a data signal to the plurality of data lines;
a scanning signal line driver that applies a scanning signal to the plurality of scanning signal lines;
a scanning signal amplitude controller that controls an amplitude of the scanning signal; and
a temperature detector that detects an ambient temperature, wherein
each of the pixel circuits includes a display element driven by an electric current, and a capacitance element charged in accordance with the data signal applied to a corresponding data line with a voltage level of the scanning signal being a level for writing, the scanning signal being applied to a corresponding one of the scanning signal lines,
the scanning signal amplitude controller increases the amplitude of the scanning signal as the ambient temperature detected by the temperature detector decreases to charge the capacitance element with a quantity of charge greater than a prescribed quantity in accordance with the data signal applied to the corresponding data line,
the display device further comprises:
a plurality of light emission control lines disposed in the display panel, the light emission control lines corresponding to the plurality of scanning signal lines on a one-to-one basis,
a light emission control line driver that applies a light emission control signal to the plurality of light emission control lines, and
a light emission period controller that controls a length of a period in which a voltage level of the light emission control signal is kept in a level for light emission, wherein
in each of the pixel circuits, the display element emits light with the voltage level of the light emission control signal being the level for light emission, the light emission control signal being applied to a corresponding one of the light emission control lines, and
the light emission period controller increases the length of the period in which the voltage level of the light emission control signal is kept in the level for light emission as the ambient temperature detected by the temperature detector decreases.
2. The display device according to claim 1 , wherein the scanning signal amplitude controller controls the amplitude of the scanning signal by changing a voltage level corresponding to the level for writing.
3. The display device according to claim 1 , wherein the scanning signal amplitude controller keeps one of a voltage level of the scanning signal on a high level side or a voltage level of the scanning signal on a low level side in a certain level and changes the other in accordance with the ambient temperature detected by the temperature detector.
4. The display device according to claim 3 , wherein
the scanning signal is transmitted to a control terminal of a p-channel transistor among transistors included in each of the pixel circuits, and
the scanning signal amplitude controller changes the voltage level of the scanning signal on the low level side in accordance with the ambient temperature detected by the temperature detector.
5. The display device according to claim 1 , wherein the temperature detector is a thermistor.
6. The display device according to claim 5 , wherein
the display device further includes a control board disposed on a back face of the display panel, and
the thermistor is disposed on the control board.
7. The display device according to claim 5 , wherein the thermistor is disposed in the display panel.