Micro LED Display Panel Brightness Uniformity via Pre-Charging Detection
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Solution Overview
Problem
Inorganic Micro LED displays face uneven brightness due to varying driving currents in different sub-pixels at different positions and times, affecting display performance and user experience.
Innovation Solution
A driving circuit with sub-pixels that include a light-emitting element, a pre-charging unit, a driving unit, and a detection unit, which generates and detects a detection driving current to determine a compensation signal, allowing for compensation of the data driving signal to ensure uniform brightness across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional driving circuit is used without compensation, then the device complexity is low, but the brightness uniformity deteriorates due to varying driving currents at different positions and times
Solution Approach 1:
The patent applies preliminary action by performing detection and compensation operations before the actual display operation. The detection unit measures the driving current characteristics in advance, and the compensation signal is generated and applied before driving the light-emitting element, ensuring uniform brightness without affecting the main display function.
Solution Approach 2:
The patent implements feedback by using the detection unit to measure the actual driving current, comparing it with the expected current, and generating a compensation signal based on the detected deviation. This closed-loop feedback mechanism corrects the driving current to achieve uniform brightness across different sub-pixels.
2Illumination intensity
If detection and compensation operations are added to each sub-pixel, then the brightness uniformity is improved, but the device complexity increases due to additional circuit components
Solution Approach 1:
The patent applies universality by designing the detection unit and compensation circuitry that can be integrated into each sub-pixel structure. The same basic components (detection unit, compensation signal generator) serve multiple functions: detecting current variations, generating compensation signals, and correcting brightness uniformity across all sub-pixels.
Solution Approach 2:
The patent merges the detection and compensation functions into the existing sub-pixel driving circuit structure. The detection unit is integrated with the driving transistor, and the compensation signal is combined with the original data signal, reducing the need for separate independent circuits and minimizing overall complexity.
3Illumination intensity
If detection and compensation operations are performed for each sub-pixel, then the brightness uniformity is improved, but the operation time increases due to additional detection and compensation steps
Solution Approach 1:
The patent applies periodic action by performing detection and compensation operations at regular intervals or at specific phases of the display refresh cycle. The detection unit operates periodically to measure driving current characteristics, and compensation is applied in a timed manner that does not disrupt the continuous display operation.
Solution Approach 2:
The patent performs detection and compensation operations in advance during the pixel programming phase, before the actual light emission phase. By completing the compensation beforehand, the display operation can proceed without additional time delays during the critical light emission period.
Data Source
AI summary
Disclosed are a display panel, a driving circuit, and a driving method. The driving circuit includes multiple sub-pixels. For each sub-pixel, the sub-pixel includes: a light-emitting element; a pre-charging unit; a driving unit; and a detection unit. In condition of a detection operation being performed, the pre-charging unit is configured to receive the data driving signal, the driving unit is configured to generate a detection driving current, and the detection unit is configured to detect the detection driving current, such that the display panel determines and compensate a compensation signal; in condition of a display operation being performed, the pre-charging unit is configured to receive the compensated data driving signal, and the driving unit is configured to generate a display driving current to drive the light-emitting element to emit light.