Multi-Frequency Display Panel Zone Driving Control
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Solution Overview
Problem
Existing display devices fail to reduce power consumption effectively when displaying still images on a large portion or the entire display panel, as they continue to operate at the same frequency as input frame frequency, preventing the implementation of low frequency driving techniques.
Innovation Solution
A display device employing multi-frequency driving (MFD) with a controller that divides input image data into partial zones, determines optimal driving frequencies for each zone, and sets non-driving periods to reduce power consumption by selectively providing scan driver input signals during driving frames and not during non-driving frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If low frequency driving technique is applied to reduce power consumption, then power consumption is reduced, but when still image is displayed in entire or partial region, the entire region must be driven at input frame frequency, preventing low frequency driving from being performed
Solution Approach 1:
The display panel is divided into multiple partial panel zones, and each zone can be driven at different frequencies independently. The controller divides input image data into multiple partial image data corresponding to different zones, allowing selective low-frequency driving in zones displaying still images while maintaining high-frequency driving in zones displaying moving images.
Solution Approach 2:
The driving frequency of each partial panel zone is dynamically adjusted based on the type of image content (still or moving) displayed in that zone. The controller determines driving frequencies for each zone by analyzing partial image data, enabling flexible adaptation to different display scenarios and optimizing power consumption according to actual needs.
2Reliability
If the entire display panel is driven at input frame frequency to ensure image quality, then image quality is maintained, but power consumption cannot be reduced
Solution Approach 1:
Different driving frequencies are applied to different partial panel zones based on their specific display content. Zones displaying still images are driven at lower frequencies to save power, while zones displaying moving images are driven at higher frequencies to maintain image quality. This local differentiation allows power optimization without compromising overall image quality.
Solution Approach 2:
The driving frequency parameter is changed for each partial panel zone based on the analyzed image content. By determining optimal driving frequencies for different zones and selectively applying them, the system achieves power consumption reduction while maintaining appropriate image quality in each zone.
3Use of energy by moving object
If multi-frequency driving is implemented by dividing panel into zones and analyzing image content, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The controller is divided into functional blocks including zone splitting block, panel zone frequency deciding blocks, non-driving period setting block, and scan driver control block. Each block performs a specific function in the multi-frequency driving process, making the complex control task manageable and organized while achieving power consumption reduction.
Data Source
AI summary
A display device including: a controller including: a zone splitting block configured to divide input image data into a plurality of partial image data respectively corresponding to a plurality of partial panel zones of the display panel; a plurality of panel zone frequency deciding blocks configured to determine a plurality of driving frequencies for the plurality of partial panel zones by analyzing the plurality of partial image data, respectively; a non-driving period setting block configured to classify a plurality of frame periods into a driving frame period and a non-driving frame period based on a maximum driving frequency of the plurality of driving frequencies; and a scan driver control block configured to provide the scan driver input signal to the scan driver in the driving frame period, and to not provide the scan driver input signal to the scan driver in the non-driving frame period.