Pixel Driving Circuit With Periodic Emission to Reduce Display Flicker
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Solution Overview
Problem
Micro inorganic light emitting diodes in display devices often flicker due to short total light emission time and non-uniform light emission within a frame, particularly at low-gray-level displays, leading to visible flicker and poor user experience, especially in high-resolution displays where data write time is excessive.
Innovation Solution
A pixel driving circuit with a current control sub-circuit, time length control sub-circuit, and output sub-circuit is designed to ensure equal durations of adjacent turn-ons and turn-offs, using a comparator to generate a periodic square wave signal for uniform light emission, thereby mitigating flicker and optimizing light emission time distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the total light emission time is increased to reduce flicker, then the uniformity of light emission improves, but the data write time becomes insufficient for high-resolution displays
Solution Approach 1:
The light emission period is divided into multiple sub-periods, and the data write operation is segmented to occur during specific sub-periods rather than requiring continuous time. This allows the display to maintain uniform light emission across the frame while allocating dedicated time slots for data writing, resolving the conflict between emission uniformity and write time availability.
Solution Approach 2:
The patent implements periodic data writing and periodic light emission patterns where data is written in periodic intervals and light emission occurs in controlled periodic sub-periods. This periodic structure allows both high-resolution data to be written over time while maintaining uniform perceived light emission, as the human eye integrates the periodic emission into a uniform perception.
2Illumination intensity
If the light emission time is extended for low-gray-level display, then the brightness uniformity improves, but the frame time allocation becomes non-uniform causing flicker
Solution Approach 1:
The patent uses asymmetric time allocation within the frame by dividing the light emission period into multiple sub-periods with different characteristics. Specifically, the first light emission sub-period has different timing characteristics than subsequent sub-periods, allowing optimized brightness control for low-gray-level display while maintaining overall frame uniformity through the structured asymmetric division.
Solution Approach 2:
The patent changes the timing parameters of light emission sub-periods dynamically based on the display requirements. By adjusting the duration and timing of different light emission sub-periods within the frame, the system achieves uniform brightness perception while accommodating the need for extended light emission time in low-gray-level scenarios.
Data Source
AI summary
Provided is a pixel driving circuit configured to provide a signal to a to-be-driven element. The pixel driving circuit includes: a current control sub-circuit, configured to transmit a current signal; a time length control sub-circuit, configured to transmit a time signal; and an output sub-circuit, electrically connected with the time length control sub-circuit and the current control sub-circuit, respectively; where the time length control sub-circuit is further configured to control the output sub-circuit to be turned on or off based on the time signal; the output sub-circuit is configured to, when turned on, control a current applied to the to-be-driven element based on the current signal, where duration of two adjacent turn-ons of the output sub-circuit is same and duration of two adjacent turn-offs of the output sub-circuit is same.