Pixel Drive Circuit with Split Current and Duration Control
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Solution Overview
Problem
Display devices face challenges in accurately controlling gray scale performance due to long response times of constant currents generated by pixel drive circuits, which affect the precision of image rendering.
Innovation Solution
A pixel drive circuit is designed with a current control sub-circuit and duration control sub-circuit to manage signal control and drive currents, utilizing multiple signal lines to reduce response time and enhance control over light emission duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional pixel drive circuit is used to generate constant current, then the light emitting device can be driven, but the response time is long which affects gray scale accuracy
Solution Approach 1:
The pixel drive circuit is divided into two independent sub-circuits: a current control sub-circuit that controls the magnitude of drive current, and a duration control sub-circuit that controls the light emitting duration. This segmentation allows each sub-circuit to be optimized for its specific function, with the duration control sub-circuit using multiple signal lines to achieve fast response time and the current control sub-circuit maintaining stable current control for gray scale accuracy.
Solution Approach 2:
The patent introduces dynamic control of light emitting duration through the duration control sub-circuit, which receives multiple signal lines (first scan signal line, second scan signal line, third scan signal line) to dynamically adjust the light emitting time. This dynamic control enables fast response to gray scale changes while maintaining current stability through the separate current control sub-circuit.
2Measurement precision
If the response time is reduced to improve gray scale accuracy, then image rendering precision improves, but the circuit complexity increases
Solution Approach 1:
By segmenting the pixel drive circuit into current control and duration control sub-circuits, the patent distributes the complexity across specialized modules. The duration control sub-circuit handles the complex multi-signal line control for fast response, while the current control sub-circuit maintains simplicity for stable current generation, overall managing complexity while achieving high precision.
Solution Approach 2:
The duration control sub-circuit is designed to handle multiple signal lines (first scan, second scan, third scan signal lines) and perform multiple functions including duration control, threshold compensation, and data writing. This multi-functionality consolidates control logic into a universal sub-circuit, managing overall circuit complexity while achieving fast response time.
Data Source
AI summary
A pixel drive circuit is configured to drive a light emitting device to emit light, the light emitting device includes a first electrode and a second electrode, the pixel drive circuit includes a current control sub-circuit and a duration control sub-circuit; the duration control sub-circuit is configured to provide control signal to a first node under control of signals of a first scan signal line, a first reset signal line, a first light emitting signal line, control signal line, a data signal line, an initial signal line, and a first power supply line; the current control sub-circuit is configured to provide a drive current to a first electrode of a light emitting device under control of signals of a first node, a second scan signal line, a second reset signal line, a second light emitting signal line, a Data signal line, and a second power supply line.