Display Driving Chip for Dynamic Partial Refresh Boundaries
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Solution Overview
Problem
Conventional display panels operate all display areas at the same frame rate, leading to inefficient power consumption due to high frame rates in areas that do not require frequent screen refreshes and inadequate refresh rates in areas that do require frequent screen refreshes.
Innovation Solution
A display apparatus with a display driving chip that controls the gate driver to dynamically adjust the boundary between high and low refresh rate display areas, allowing different refresh rates in adjacent partitions and reducing power consumption by refreshing only high refresh rate areas during partial refresh frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the entire display area is operated at a high frame rate, then the refresh rate for partitions requiring frequent screen refreshes is sufficient, but the power consumption of the display panel increases significantly
Solution Approach 1:
The display panel is divided into multiple independent partitions, each capable of operating at different frame rates. The controller separately manages scan lines for each partition, allowing high frame rate operation only in partitions that require frequent refreshes while using low frame rate operation in partitions with static or less frequently updated content, thereby reducing overall power consumption
Solution Approach 2:
The frame rate for each partition is made dynamically adjustable based on the actual display content requirements. The controller can switch between high and low frame rate modes for different partitions, adapting the refresh rate to the specific needs of each region rather than using a fixed high frame rate for the entire display area
2Use of energy by moving object
If the entire display area is operated at a low frame rate, then the power consumption of the display panel is reduced, but the refresh rate is too low for partitions that require frequent screen refreshes
Solution Approach 1:
The display panel is segmented into multiple partitions with independent frame rate control. Partitions requiring high refresh rates (such as those displaying video or animations) operate at high frame rates, while partitions with static content operate at low frame rates, ensuring that power consumption is reduced without compromising the performance requirements of specific display regions
Solution Approach 2:
Different frame rates are applied to different spatial regions (partitions) of the display panel based on their specific requirements. Each partition receives the appropriate frame rate locally, rather than applying a uniform frame rate across the entire display area, thus optimizing both power consumption and display quality in each region
3Device complexity
If the display panel uses fixed partition boundaries for different frame rates, then the control logic is simple, but visual artifacts and aging differences become apparent at the partition boundaries
Solution Approach 1:
The partition boundaries between different frame rate regions are made dynamic rather than fixed. The controller periodically adjusts the boundary positions between partitions, preventing static visual artifacts and aging differences from becoming permanently visible at fixed boundary locations, thereby improving visual quality consistency across the display panel
Data Source
AI summary
Disclosed are a display apparatus and its display driving chip and method. A display area of the display panel includes a high refresh rate display area and a low refresh rate display area that are adjacent to each other. In a full refresh frame period, both the high refresh rate display area and the low refresh rate display area are refreshed with data. In a partial refresh frame period, data is refreshed in the high refresh rate display area and data is not refreshed in the low refresh rate display area. The controller controls the gate driver such that a boundary between the high refresh rate display area and the low refresh rate display area in a first partial refresh frame period is different from a boundary between the high refresh rate display area and the low refresh rate display area in a second partial refresh frame period.