Display Driving Circuit Compensation for Luminance and Flicker Stability
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Solution Overview
Problem
Display panels experience variations in displaying characteristics over time due to changes in refresh frequency, leading to decreased luminance and flickering, which affect displaying quality.
Innovation Solution
A driving circuit with a compensation module that generates signals to adjust the driving signals based on the variation and difference in displaying characteristics between images, using reference data and display frequency to minimize these variations and differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the refresh frequency of display panel is decreased in power saving mode, then energy consumption is reduced, but luminance decreases with time and displaying quality deteriorates
Solution Approach 1:
The compensation module performs preliminary calculations of luminance variation before the actual display frame is rendered. By predicting the luminance change based on refresh frequency and timing, the system pre-determines the necessary compensation values that will be applied to the driving signals, ensuring luminance stability is maintained even at lower refresh frequencies
Solution Approach 2:
The system dynamically adjusts driving signal parameters (such as voltage or current levels) based on the calculated luminance variation. The compensation module modifies the driving signal parameters in real-time to counteract the expected luminance decrease, allowing the display to maintain consistent luminance across different refresh frequencies including power-saving low frequency modes
2Adaptability or versatility
If the refresh frequency range is increased to support dynamic refresh, then adaptability is improved, but displaying characteristics vary with time and flickering occurs
Solution Approach 1:
The compensation module implements a feedback mechanism where the actual luminance variation is calculated based on the specific refresh frequency being used. This calculated variation feeds back into the driving signal generation process, allowing the system to automatically adjust and compensate for characteristics variations at any refresh frequency within the dynamic range, thereby maintaining display stability
Solution Approach 2:
The system dynamically adapts the compensation strategy based on the current refresh frequency. Rather than using fixed compensation values, the compensation module adjusts its calculations and compensation amounts in real-time according to the active refresh rate, enabling stable displaying characteristics across the entire dynamic refresh frequency range from low power-saving modes to high performance modes
Data Source
AI summary
The present application relates to a driving circuit for display panel, comprising a compensation module and a driving module. The compensation module generates a first compensation signal according to variation of a first displaying characteristic of a first image in a frame time. The driving module generates a first driving signal according to the first compensation signal for driving the display panel to display the first image in a first frame time. By avoiding excessive variation of displaying characteristics of the first image with time, the displaying quality may be improved. In addition, the compensation module generates a second compensation signal according to the difference between the first displaying characteristic of the first image and a second displaying characteristic of a second image. The driving module drives the display panel to display the second image in a second frame time according to the second compensation signal. Accordingly, the influence on displaying quality owing to excessive difference in displaying characteristics between the first image displayed in the first frame time and the second image displayed in the second frame time may be avoided.