Method for controlling charging time of display panel, and electronic apparatus

A method for controlling a charging time of a display panel, wherein the display panel includes sub-pixels in M rows and N columns, and each sub-pixel includes a light-emitting device and a driving transistor;

• a second electrode of the driving transistor is electrically connected to an anode of the light-emitting device;
• wherein M≥1, N≥1, and M and N are positive integers;
• the method comprises:
• during a (k+1)-th blanking time, setting a charging time of a sub-pixel in a j-th row and an i-th column to be T=t0+kΔt, writing a data voltage to a gate of a driving transistor in the sub-pixel in the j-th row and the i-th column and at an end of the charging time t0+kΔt, detecting a voltage Vk_(j,i) of a second electrode of the driving transistor, wherein t0 is an initial charging time, and t0 is less than a saturation charging time of the driving transistor, and 1≤j≤M, 1≤i≤N, k≥0, i, j and k are integers;
• during a (k+1+r)-th blanking time, setting the charging time of the sub-pixel in the j-th row and the i-th column to be T=t0+(k+r)Δt, writing the data voltage to the gate of the driving transistor in the sub-pixel in the j-th row and the i-th column and at an end of the charging time t0+(k+r)Δt, detecting a voltage Vk+1_(j,i) of the second electrode of the driving transistor, r≥1, and r being a positive integer;
• obtaining a voltage difference ΔVj,i=Vk+1_(j,i)−Vk_(j,i) of the second electrode of the driving transistor in the sub-pixel in the j-th row and the i-th column between two adjacent blanking times,
• comparing the voltage difference ΔVj,i with a target voltage difference VT;
• if ΔVj,i≤VT, taking t0+kΔt as an expected charging time of the sub-pixel in the j-th row and the i-th column;
• and
• if ΔVj,i>VT, cyclically performing:
• assigning k+p to k, detecting a voltage Vk+p+1_(j,i) of the second electrode of the driving transistor in the sub-pixel in the j-th row and the i-th column, obtaining ΔVj,i=Vk+p+1_(j,i)−Vk+p_(j,i), comparing ΔVj,i and the target voltage difference VT, until ΔVj,i≤VT, and taking t0+(k+p+r−1)Δt as the expected charging time of the sub-pixel in the j-th row and the i-th column, p being taken from 1 and increasing by 1 for each cycle.