Pixel Circuit Layout for Stable Drive Current in Display Panels
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Solution Overview
Problem
The potential at the gate of the drive transistor in display panel pixel circuits is unstable, leading to unstable drive current output and affecting display brightness and uniformity.
Innovation Solution
A pixel circuit design that individually controls the cathode potential of light-emitting elements, using a drive circuit, reset circuits, data write circuits, and storage circuits to maintain stable potential differences during light emission, reducing the need for capacitance coupling and simplifying storage module design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the gate potential and source potential of the drive transistor both change in the light emission stage, then the circuit structure is simpler, but the potential difference between gate and source becomes unstable, causing drive current instability
Solution Approach 1:
The pixel circuit is divided into multiple independent functional modules: drive circuit, first reset circuit, data write circuit, first light emission control circuit, second light emission control circuit, and storage circuit. Each module independently controls specific potentials, allowing the gate potential and source potential to be managed separately to maintain stable potential difference while enabling flexible circuit design.
Solution Approach 2:
The invention changes the control mode of power supply signals by introducing separate light emission control circuits that independently regulate the gate potential and source potential. The storage circuit maintains the gate potential while the second light emission control circuit stabilizes the source potential, transforming the potential control from a coupled system to an independently controllable parameter system.
2Reliability
If the storage module provides both charge storage and coupling functions, then the potential can be maintained, but the design requirements and impact on light-emitting elements increase
Solution Approach 1:
The storage module's functions are segmented: the storage circuit (capacitor) is dedicated solely to charge storage and potential maintenance, while the light emission control circuits handle the coupling and signal transmission functions. This functional separation reduces the design complexity of the storage module while maintaining reliable potential control.
Solution Approach 2:
The light emission control circuits act as intermediary elements between the storage circuit and the light-emitting elements. These intermediary circuits manage the coupling requirements and signal transmission, allowing the storage circuit to focus only on potential maintenance without directly interacting with the light-emitting elements, thereby reducing its design constraints.
Data Source
AI summary
A pixel circuit and a display panel. The pixel circuit includes a drive circuit, a first reset circuit, a data write circuit, a first light emission control circuit, a second light emission control circuit and a storage circuit. The first reset circuit is connected to the drive circuit; the data write circuit is connected to the drive circuit; the first light emission control circuit is connected in series with a light-emitting element between a positive voltage power supply and the drive circuit; the second light emission control circuit is connected between the drive circuit and a negative voltage power supply; the storage circuit is electrically connected to the drive circuit.