Display Panel Driver Circuit Segmentation for Uniform Brightness
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Solution Overview
Problem
Existing display panels suffer from poor display uniformity and accuracy due to unstable brightness output across different color light-emitting elements, as they use the same driver circuit for elements with varying luminescence efficiency, leading to inaccurate grayscale representation.
Innovation Solution
A display panel design featuring separate driver circuits for each light-emitting element, with the first driver circuit providing a larger average current to elements with lower luminescence efficiency and a smaller average current to those with higher efficiency, using pulse-amplitude and pulse-width modulation circuits to control drive currents based on specific data voltages and sweep signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same driver circuit is used for all light-emitting elements, then the device complexity is reduced, but the display uniformity and brightness accuracy deteriorate due to varying luminescence efficiency among different color elements
Solution Approach 1:
The patent divides the driver circuit into separate independent circuits for different color light-emitting elements (red, green, blue subpixels). Each color element has its own driver circuit that can be independently configured to provide the specific average current required for that color, thereby resolving the contradiction between circuit simplicity and display uniformity.
Solution Approach 2:
The patent implements local quality by configuring each driver circuit with different parameters tailored to the specific luminescence characteristics of each color element. The driver circuits are designed with different average current values (e.g., red requires higher average current than green or blue) to compensate for varying luminescence efficiency, ensuring uniform brightness across all colors.
2Manufacturing precision
If separate driver circuits with different average currents are used for each light-emitting element, then the display uniformity and brightness accuracy are improved, but the device complexity increases
Solution Approach 1:
The patent employs pulse-width modulation (PWM) and pulse-amplitude modulation (PAM) circuits that dynamically adjust the drive current parameters based on grayscale values and timing signals. This dynamic control allows the system to maintain high brightness accuracy across different display conditions while managing circuit complexity through standardized modulation approaches.
Solution Approach 2:
The patent changes key parameters of the driver circuits, specifically the average current values for each color element, to match the luminescence characteristics. By adjusting parameters like the average current (Iavg) and modulation depths, the system achieves uniform brightness output without requiring fundamentally different circuit architectures for each color.
3Manufacturing precision
If different average currents are provided to light-emitting elements with different luminescence efficiency, then the display uniformity is improved, but the difficulty of detecting and measuring the required current parameters increases
Solution Approach 1:
The patent incorporates feedback mechanisms where the driver circuits use measured or pre-characterized luminescence efficiency data to automatically adjust the drive current parameters. This feedback approach simplifies the measurement and calibration process by using the luminescence characteristics themselves as the basis for determining the required current adjustments.
Solution Approach 2:
The patent performs preliminary characterization of the luminescence efficiency for each color element during manufacturing or initialization, and uses this pre-measured data to configure the driver circuit parameters beforehand. This preliminary action eliminates the need for complex real-time measurement and adjustment, simplifying the operational phase.
Data Source
AI summary
Provided are a display panel and a display device. The display panel includes a first light-emitting element, a second light-emitting element, a first driver circuit and a second driver circuit. The first driver circuit is electrically connected to the first light-emitting element and configured to provide a first drive current to the first light-emitting element to control the first light-emitting element to emit light, and the second driver circuit is electrically connected to the second light-emitting element and configured to provide a second drive current to the second light-emitting element to control the second light-emitting element to emit light.