Display Panel Bias Timing for Uniform Luminance at Variable Refresh
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Solution Overview
Problem
The difference in luminance between writing and holding frames in a variable frequency driving method leads to deteriorated display quality due to bias differences, which affects the display panel's image quality.
Innovation Solution
The display apparatus adjusts the width of the bias control signal and bias voltage in writing and holding frames to equalize the bias levels, ensuring consistent luminance across frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If variable frequency driving method is used to reduce power consumption, then power consumption is reduced, but luminance difference between writing frame and holding frame occurs due to bias difference
Solution Approach 1:
The patent applies different bias control signal widths for different frame types: a first width for writing frames and a second width for holding frames. This local differentiation ensures that each frame type receives the appropriate bias control to maintain consistent luminance, while still enabling power savings through variable frequency driving.
Solution Approach 2:
The patent changes the width parameter of the bias control signal based on the frame type (writing or holding). By adjusting this parameter dynamically, the system maintains luminance consistency across different frame types while operating in variable frequency mode to reduce power consumption.
2Illumination intensity
If bias control signal width is adjusted to equalize luminance between frames, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The patent implements a dynamic control mechanism where the bias control signal width is adjusted based on the frame type (writing or holding). This dynamic adjustment is managed by the existing driver circuitry, allowing luminance equalization without requiring additional hardware components.
Solution Approach 2:
The patent applies periodic bias control signals with different widths corresponding to different frame types in the variable frequency driving sequence. This periodic differentiation maintains luminance consistency while utilizing the existing periodic nature of display scanning.
Data Source
AI summary
A display apparatus includes a display panel, a driving controller, a gate driver, an emission driver and a data driver. The display panel includes a pixel including a driving switching element and a light emitting element. The driving controller is configured to determine a driving frequency varied according to input image data or a driving mode. The gate driver is configured to output a gate signal and a bias control signal to the pixel. The emission driver is configured to output an emission signal to the pixel. The data driver is configured to output a data voltage to the pixel. The bias control signal to apply a bias voltage to the driving switching element has a first width in a writing frame and a second width different from the first width in a holding frame.