Display Panel Driving Controller Frequency Compensation
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Solution Overview
Problem
Display panels experience power consumption issues and display quality degradation due to afterimages and flicker caused by hysteresis characteristics of pixel switching elements, especially when displaying static images or operating in Always On Mode.
Innovation Solution
A display apparatus and method that utilize a combination of polysilicon and oxide thin film transistors, with a driving controller determining low driving frequencies and compensation frequencies to insert compensation frequency frames before low frequency frames, ensuring that switching elements of different types are driven at appropriate frequencies to minimize flicker and afterimages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display panel operates at a low driving frequency to reduce power consumption, then power consumption is reduced, but afterimages and flicker occur due to hysteresis characteristics of pixel switching elements
Solution Approach 1:
The pixel circuit is divided into multiple switching elements of different types (first type and second type), each responsible for different functions. This segmentation allows the circuit to achieve both low power consumption and reduced hysteresis effects by utilizing the complementary characteristics of different transistor types.
Solution Approach 2:
The invention changes the operational parameters by introducing compensation frequencies that are higher than the low driving frequency. These compensation frequencies are applied to specific switching elements to counteract the hysteresis effects and eliminate afterimages and flicker while maintaining overall low power consumption operation.
2Object-generated harmful factors
If the display panel operates at a normal driving frequency to maintain display quality, then afterimages and flicker are minimized, but power consumption increases
Solution Approach 1:
The invention employs periodic compensation signals at compensation frequencies that are higher than the low driving frequency. These periodic actions are applied to specific switching elements to counteract hysteresis effects, allowing the display to operate at low driving frequencies without suffering from afterimages and flicker.
Solution Approach 2:
The pixel circuit uses a composite structure combining switching elements of different types (first type and second type transistors). This composite approach leverages the different electrical characteristics of each transistor type to achieve both low power consumption and high display quality simultaneously.
3Object-generated harmful factors
If compensation frequency frames are inserted before low frequency frames, then flicker and afterimages are reduced, but driving complexity increases
Solution Approach 1:
The compensation frequency frames are inserted before the low frequency frames as a preliminary action to prepare the pixel switching elements for low frequency operation. This preliminary high frequency stimulation resets the hysteresis effects before the low frequency display begins, preventing afterimages and flicker without requiring complex real-time adjustments during low frequency operation.
Solution Approach 2:
The driving controller implements a feedback mechanism that determines when to insert compensation frequency frames based on the display content and operating conditions. This feedback control optimizes the insertion of compensation frames to achieve the best display quality while minimizing the added complexity.
Data Source
AI summary
A display apparatus configured to adjust a driving frequency of a display panel by including a driving controller configured to: determine a low driving frequency corresponding to input image data; determine a plurality of compensation frequencies greater than the low driving frequency; and insert a plurality of compensation frequency frames having the compensation frequencies prior to a low driving frequency frame having the low driving frequency in a low frequency driving mode.