Display Panel Pulse Width Segmentation for Dimming Accuracy
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Solution Overview
Problem
Current display panels face challenges with low dimming accuracy and increased power consumption due to limited brightness adjustment range and high pulse width adjustments in PWM dimming methods, leading to rough brightness control and the need for additional DC dimming.
Innovation Solution
The display panel employs a light emission control signal with varying pulse widths for target and non-target level pulses, allowing for a wider duty cycle adjustment and finer brightness control, reducing the need for DC dimming and minimizing power consumption by maintaining a high duty cycle without adjusting data voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PWM dimming uses large pulse width adjustments to achieve brightness control, then brightness adjustment range is improved, but dimming accuracy deteriorates and power consumption increases
Solution Approach 1:
The light emission control signal is segmented into multiple pulse periods within each frame period, with each pulse period containing multiple first level pulses. By independently adjusting the pulse widths of target level pulses versus non-target level pulses, the system achieves fine-grained brightness control with high dimming accuracy while maintaining a wide brightness adjustment range.
Solution Approach 2:
The pulse widths of first level pulses are made dynamically adjustable within each pulse period, allowing the duty cycle to be precisely controlled. This dynamic adjustment enables the system to achieve both wide brightness range and high dimming accuracy by flexibly varying pulse widths without requiring large overall pulse width changes.
2Adaptability or versatility
If PWM dimming uses large pulse width adjustments, then brightness control range is improved, but power consumption increases
Solution Approach 1:
By segmenting the control signal into multiple pulse periods with multiple first level pulses each, the system can achieve wide brightness control range through cumulative duty cycle adjustment rather than requiring large individual pulse width changes. This segmentation enables energy-efficient brightness control across the full range.
Solution Approach 2:
The use of multiple pulse periods within each frame period allows the system to achieve desired brightness levels through periodic duty cycle modulation. This periodic action enables precise brightness control with lower power consumption by distributing the dimming control across multiple smaller pulse width adjustments rather than relying on large single adjustments.
3Device complexity
If conventional PWM dimming is used with limited brightness adjustment range, then device complexity is reduced, but dimming accuracy deteriorates
Solution Approach 1:
The control signal is divided into multiple pulse periods with multiple first level pulses, creating a segmented structure that enables high dimming accuracy. This segmentation allows precise duty cycle control without significantly increasing overall system complexity, as the segmented structure can be implemented through standard display driving architectures.
Solution Approach 2:
The dynamic adjustability of pulse widths within the segmented pulse structure enables high dimming accuracy. By allowing flexible pulse width variation in each first level pulse while maintaining the overall periodic structure, the system achieves precise brightness control without requiring complex additional hardware or control mechanisms.
Data Source
AI summary
Provided are a display panel, a dimming method thereof, and a display device. When the display panel displays a frame of image, a light emission control signal corresponding to a row of sub-pixels in the display panel includes N pulse periods. N is a positive integer. A pulse period includes first level pulses. The first level pulses include a first target level pulse and a first non-target level pulse. The pulse width of the first target level pulse is different from the pulse width of the first non-target level pulse.