Display Control Circuit Scan Timing for Flicker Reduction
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Solution Overview
Problem
Existing liquid crystal display apparatuses using active backlight techniques face issues with flickering during pausing driving, as the brightness changes rapidly, leading to inappropriate brightness and increased power consumption.
Innovation Solution
A display apparatus with a timing control device that alternates scan and retention periods, allowing multiple scans during brightness changes and gradual backlight adjustments, ensuring the display panel's transmittance matches the backlight's brightness, thereby preventing flickering and optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If pausing driving is implemented to reduce power consumption, then power consumption is reduced, but flickering and inappropriate brightness occur
Solution Approach 1:
The scan period is divided into multiple sub-periods with different scan frequencies. During brightness transition periods, multiple scans are performed within one scan period to gradually adjust brightness. During stable brightness periods, a single scan is performed. This segmentation allows the system to reduce power consumption while preventing flickering by adapting the scan frequency to the brightness state.
Solution Approach 2:
The scan frequency is dynamically adjusted based on the brightness change state. When brightness is changing, multiple scans are performed within a scan period to gradually transition. When brightness is stable, a single scan is performed to save power. This dynamic adjustment resolves the contradiction between power consumption and brightness stability.
2Speed
If backlight brightness is changed rapidly to respond to video data, then response speed is improved, but flickering occurs
Solution Approach 1:
The system performs preliminary scans during the scan period before the brightness fully transitions. By conducting multiple scans in sequence during the brightness change period, the system preliminarily adjusts the display to the new brightness level, preventing sudden brightness changes and flickering while maintaining responsive video data processing.
Solution Approach 2:
Multiple periodic scans are performed within a single scan period when brightness is changing. This periodic action distributes the brightness transition over multiple scanning cycles, preventing rapid and unnatural brightness changes that cause flickering, while still maintaining timely response to video data changes.
Data Source
AI summary
A display apparatus and a display control circuit which may contain an occurrence of the inappropriate brightness, such as flickering, at the time of pausing driving are provided. A scan period (St1, St2) during which a display panel drive device scans a display panel device and a retention period (Vt1) during which the display panel drive device does not scan the display panel device alternate and a timing control device causes the display panel drive device to scan the display panel device a plurality of times in the scan period when at least the brightness (Lb1) of the backlight device is changed.