Display Panel Driving Circuit for Foldable Devices
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Solution Overview
Problem
Foldable and slidable display devices experience luminance and image quality differences due to differential deterioration between display regions with varying operating times, leading to visible boundary lines when an image is displayed on entire or partial regions.
Innovation Solution
A display device with a display panel comprising first, second, and third regions, where the display panel driving circuit drives the first and second regions in full pixel-row mode and the third region in partial pixel-row mode, selectively applying data and charge sharing operations to minimize perceived boundary lines by varying refresh rates and pixel-row selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If an image is displayed on the entire display region including the third display region, then the display area is maximized, but a boundary line becomes visible due to deterioration difference between the first display region and the second display region
Solution Approach 1:
The patent applies dynamic driving strategies that adapt to different display scenarios. When the display panel is folded or partially extended, the driving circuit dynamically switches between full pixel-row driving mode (for regions requiring high image quality like the first display region) and partial pixel-row driving mode (for regions where image quality is less critical like the third display region). This dynamic adaptation allows the system to maximize display area while minimizing visible boundary lines by adjusting driving parameters based on real-time display state.
Solution Approach 2:
The patent implements local quality differentiation by applying different driving modes to different display regions. The first display region (front side) receives full pixel-row driving for high image quality, while the third display region (connecting area) receives partial pixel-row driving. This local differentiation strategy optimizes overall image quality by concentrating resources on critical regions while accepting reduced quality in less noticeable areas, thereby reducing visible boundary lines when the entire display region is active.
2Manufacturing precision
If the third display region is driven in full pixel-row driving manner, then image quality is improved, but power consumption increases
Solution Approach 1:
The patent applies local quality differentiation by implementing partial pixel-row driving mode specifically for the third display region, which connects the first and second display regions. In this mode, only selected pixel-rows are driven at full resolution while other pixel-rows use lower resolution or are skipped entirely. This approach maintains acceptable image quality in the connecting region while significantly reducing power consumption compared to driving all pixel-rows at full resolution, thus resolving the contradiction between image quality and power usage.
Solution Approach 2:
The patent employs partial action by selectively driving only certain pixel-rows in the third display region rather than all pixel-rows. The driving circuit chooses which pixel-rows to activate based on display state and power requirements, applying full driving effort only where necessary (first display region) and reduced effort where acceptable (third display region). This partial driving strategy reduces overall power consumption while maintaining sufficient image quality for the intended use case.
3Use of energy by moving object
If the first display region is driven in full pixel-row driving manner while the third display region is driven in partial pixel-row driving manner, then power consumption is reduced, but a boundary line may become visible between the regions
Solution Approach 1:
The patent uses dynamic driving mode switching to adapt to different display states. When the display panel is in a folded state or partially extended, the system dynamically activates full pixel-row driving for the first display region and partial pixel-row driving for the third display region. This dynamic configuration optimizes power consumption by reducing driving intensity in the connecting region while maintaining high image quality in the primary display area, and the boundary line becomes less noticeable due to the folded configuration itself.
Data Source
AI summary
A display device includes: a display panel including a first display region, a second display region, and a third display region between the first display region and the second display region; and a display panel driving circuit configured to drive the display panel, wherein the display panel driving circuit drives the first display region, the second display region, and the third display region in a full pixel-row driving manner when an image is displayed on the first display region, the second display region, and the third display region, and wherein the display panel driving circuit drives the first display region in the full pixel-row driving manner and drives the third display region in a partial pixel-row driving manner when the image is displayed only on the first display region and the third display region.