Light emissive element having pixel sensing circuit
AssigneeTPO Displays Corp.
InventorsAndrea Giraldo, Mark Thomas Johnson
Life of this patent
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Abstract
A method for sensing a light emissive element in an active matrix display pixel cell further including a data line connectable to a drive element and to a first electrode of the emissive element. The data line is connected to the anode of the emissive element, and a sensing voltage to reverse bias the emissive element, and detecting any leakage current flowing through the emissive element.
Claims20
A method for sensing a light emissive element (25) in an active matrix display pixel cell (20;
- 20′), further comprising a data line (21) connectable to a drive element (24) and to a first electrode (29) of the emissive element (25), said method comprising:
- during repeated output periods, connecting the data line (21) to the drive element (24), and providing on the data line (21) a drive signal (V) to cause the emissive element (25) to generate light, and during a sensing period, between two output periods, connecting the data line (21) to the first electrode (29) of the emissive element (25), providing on the data line (21) a sensing voltage (V1) to reverse bias the emissive element (25), and detecting any leakage current (IL) flowing through the emissive element (25).
An active matrix display device, comprising a plurality of pixel cells (20;
- 20′) each having a current driven emissive element (25) and means for connecting a data line (21) to the first electrode (29) of the emissive element, further characterized by:
- means (1;
- 43, 44) for providing on the data line a sensing voltage (V1) which is negative in respect of an emissive element cathode voltage (31), thereby reverse biasing the emissive element (25), and means (41, 42) for detecting any leakage current flowing through the emissive element.
A pixel cell in an active matrix display device, comprising a data line (21), a drive element (24), an emissive element (25), and a first switch (32), provided between the data line (21) and the drive element (24), and a second switch (33) provided between the data line (21) and the anode (29) of the emissive element.
Dependencies are inferred from the claim text.