Display device
View Patent ↗A display device includes self-luminous elements arrayed to form a display screen, and a driving circuit which causes drive currents to flow in the self-luminous elements according to pixel signals. Particularly, the driving circuit is configured to restrict the drive currents flowing in the self-luminous elements upon increase in the total sum of the drive currents.
1. A display device comprising:
a plurality of self-luminous elements arrayed to form a display screen; and
a driving circuit which causes drive currents to flow in said self-luminous elements according to pixel signals, said driving circuit being configured to restrict the drive currents flowing in said self-luminous elements upon increase in the total sum of the drive currents,
wherein said driving circuit comprises,
a D/A conversion circuit which digital-to-analog converts the pixel signals;
a gradation reference circuit which generates a predetermined number of gradation reference signals which are referred to by said D/A conversion circuit; and
a correction circuit which detects the total sum of the drive currents flowing in said self-luminous elements and controls said gradation reference circuit to produce a predetermined number of gradation reference signals whose levels are uniformly corrected according to the total sum,
wherein said gradation reference circuit includes a voltage division circuit which comprises a plurality of resistor elements connected to output a predetermined number of gradation reference voltages whose voltage ratios to a reference power supply voltage differ from each other, as the predetermined number of gradation reference signals, respectively.
2. The display device according to claim 1 , wherein said self-luminous elements are formed of organic electro-luminescence elements.
3. A display device comprising:
a plurality of self-luminous elements arrayed to form a display screen; and
a driving circuit which causes drive currents to flow in said self-luminous elements according to pixel signals, said driving circuit being configured to restrict the drive currents flowing in said self-luminous elements upon increase in the total sum of the drive currents,
wherein said driving circuit comprises,
a D/A conversion circuit which digital-to-analog converts the pixel signals;
a gradation reference circuit which generates a predetermined number of gradation reference signals which are referred to by said D/A conversion circuit; and
a correction circuit which detects the total sum of the drive currents flowing in said self-luminous elements and controls said gradation reference circuit to produce a predetermined number of gradation reference signals whose levels are uniformly corrected according to the total sum,
wherein said gradation reference circuit includes a current mirror circuit which comprises a plurality of active current mirror elements connected to output a predetermined number of gradation reference currents whose current ratios to a reference power supply current differ from each other, as the predetermined number of gradation reference signals, respectively.
4. The display device according to claim 3 , wherein said self-luminous elements are formed of organic electro-luminescence elements.