Patent ID: 8330679
Filing Date: 2012-12-11
Classification: G09G

Abstract:
1. An electronic device, comprising: a plurality of data lines; a plurality of scanning lines; a plurality of voltage supply lines; and a plurality of circuits, each of the plurality of circuits including an electroluminescent element, a first transistor, a second transistor, and a third transistor, the first transistor having a first terminal, a second terminal, and a channel region formed between the first terminal and the second terminal, the first terminal permanently connected to a first voltage supply line of the plurality of voltage supply lines, the second transistor having a control terminal connected to a scanning line of the plurality of scanning lines for supplying a data current from a data line of the plurality of data lines to a respective pixel circuit, the third transistor having a control terminal connected to the scanning line for controlling an electrical connection between a control terminal of the first transistor and the second terminal of the first transistor, a capacitor having a third terminal permanently connected to a second voltage supply line of the plurality of voltage supply lines and a second terminal connected to the control terminal of the first transistor, the first and second voltage supply lines configured to be controlled separately, the first voltage supply line supplying a first and a second voltage level and the second voltage supply line supplying the first voltage level; the electronic device being configured such that: a reverse biasing current flows from the data line through the second and third transistors and through the second terminal of the first transistor to the first voltage supply line through the first terminal of the first transistor when a potential of the first voltage supply line and a potential of the second voltage supply line are constantly set to the first voltage level; and a forward biasing current flows from the first voltage supply line to the second terminal of the first transistor through the first terminal of the first transistor when a potential of the first voltage supply line is constantly set to the second voltage level and the second voltage supply line is constantly set to the first voltage level, the first voltage level being different from the second voltage level, and the forward biasing current causing the electroluminescent element to emit light.