Spontaneous light emitting display device
View Patent ↗In a driving circuit of a spontaneous light emitting display device driven as an active matrix, a noise current is prevented from flowing in a light emitting element when compensating for a threshold voltage of a transistor for controlling current flowing to the emitting element, enhancing precision in luminance. A switching element for short-circuiting electrodes of the spontaneous light emitting element for a period in which the noise current flows in the light emitting element bypasses the noise current.
1. A spontaneous light emitting display device with a driving circuit comprising:
a selection line for selecting a pixel over which a luminance control is to be carried out,
a luminance data line for supplying a voltage corresponding to a luminance,
a first transistor made conducting or non-conducting in response to a signal of the selection line,
first and second capacitors for holding a voltage from the luminance data line,
a spontaneous light emitting element,
a second transistor including a gate and a drain, the second transistor for controlling current supplied to the spontaneous light emitting element,
a third transistor for connecting or blocking the gate and the drain of the second transistor,
a first control signal line for supplying a signal voltage to control the third transistor to conduct or not to conduct,
a fourth transistor for connecting or blocking the spontaneous light emitting element and the second transistor,
a second control signal line for supplying a signal voltage to make the fourth transistor conduct or not conduct,
a voltage supply line for supplying a voltage to the spontaneous light emitting element, and
a switching element connected in parallel with the spontaneous light emitting element for short-circuiting the spontaneous light emitting element.
2. The spontaneous light emitting display device of claim 1 , wherein a signal line for supplying a signal to operate the switching element is shared by the selection line.
3. The spontaneous light emitting display device of claim 1 , including a resistive element connected in series to the fourth transistor for a period in which the switching element is conducting.
4. The spontaneous light emitting display device of claim 2 , including a resistive element connected in series to the fourth transistor for a period in which the switching element is conducting.
5. The spontaneous light emitting display device of claim 1 , wherein a signal line for supplying a signal to operate the switching element is shared by the first control signal line.
6. The spontaneous light emitting display device of claim 1 further comprising, as the spontaneous light emitting element, an organic light emitting element.