Active matrix organic light emitting diode display
AssigneeSamsung Electronics Co., Ltd.
InventorMichael G. Kane
Life of this patent
Estimating the term…
Abstract
A unit pixel of a display includes a driver circuit, a memory circuit and a current controller. The driver circuit is configured to drive a light emitting device. The memory circuit is coupled to the driver circuit, and is configured to store image data for the unit pixel. The current controller circuit is coupled to the driver circuit, and configured to control a current flowing through at least a portion of the driver circuit such that the driver circuit drives the light emitting device with a constant or substantially constant current.
Claims4
An AMOLED (organic light emitting diode) display comprising:
- an organic light emitting device;
- a driving transistor comprising a drain connected to the organic light emitting diode and a source supplied with a driving voltage for driving the organic light emitting diode;
- a memory capacitor connected to a gate and the source of the driving transistor in parallel;
- a switching transistor comprising a gate and a drain supplied with scan and data signals and a source connected to the gate of the driving transistor;
- a programming transistor comprising a gate and a drain respectively connected to the gate and drain of the switching transistor and a source connected to the drain of the driving transistor;
- and
- a current controller determining a current flowing through the driving and programming transistors.
The AMOLED display of claim 2, wherein the driving, switching, and programming transistors are p-channel.
An AMOLED display comprising:
- a plurality of scan lines and a plurality of data lines disposed on an X-Y matrix;
- an organic light emitting device provided in each of pixel areas defined by the scan lines and the data lines;
- and
- a driver driving the organic light emitting device in each of the pixel areas,
- wherein the driver comprises:
- a driving transistor comprising a drain connected to the organic light emitting device and a source supplied with a driving voltage for driving the organic light emitting device;
- a memory capacitor connected to a gate and the source of the driving transistor in parallel;
- a switching transistor comprising a gate and a drain connected to the scan and data lines and a source connected to the gate of the driving transistor;
- a programming transistor comprising a gate and a drain respectively connected to the gate and drain of the switching transistor and a source connected to the drain of the driving transistor;
- and
- a current controller connected to the data lines to determine a current flowing through the driving and programming transistors.
Dependencies are inferred from the claim text.