LED Driving Circuit Periodic Emission Flicker Reduction
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Solution Overview
Problem
Existing active matrix LED display technologies face challenges in maintaining stable light emitting intensity due to LED device characteristics, particularly in the low driving current range, and risk flicker issues with semi-hold drive schemes.
Innovation Solution
The proposed solution involves a light emitting device with a driving mechanism that divides the emission period into multiple emission periods and staggers these periods for adjacent pixels, thereby increasing the emission frequency and reducing the risk of flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If active matrix LED display uses hold drive scheme with low driving current, then power consumption is reduced, but light emitting intensity becomes unstable with large variation
Solution Approach 1:
The patent implements a periodic drive scheme where the light emitting unit is driven to emit light in multiple discrete emission periods within each display frame period. The driving circuit turns on the light emitting unit at specific time intervals according to a periodic pattern, creating multiple emission cycles rather than continuous or single-period emission. This periodic action maintains stable light intensity by ensuring sufficient current flow during each emission period while reducing overall power consumption through off periods between emissions.
2Reliability
If semi-hold drive scheme uses larger driving current with short emission period, then light emitting intensity stability is improved, but flicker risk increases due to repetition of ON and OFF
Solution Approach 1:
The patent segments the emission period into multiple shorter emission intervals distributed throughout the display frame period. Instead of one long continuous emission period that causes flicker, the light emitting unit is activated in several separated intervals. This segmentation of the emission timeline reduces the perception of flicker by distributing the ON-OFF transitions across different time points, while still maintaining adequate current levels during each interval for stable light intensity.
Solution Approach 2:
The driving circuit implements periodic activation of the light emitting unit with multiple emission periods per frame. By carefully controlling the timing and duration of each emission period within the periodic cycle, the scheme achieves stable light output while the periodic nature distributes the transitions to minimize flicker perception.
3Object-affected harmful factors
If emission period is divided into multiple emission periods, then flicker risk is reduced, but driving circuit complexity increases
Solution Approach 1:
The driving circuit is designed to automatically generate the multi-period emission pattern through intrinsic control logic without requiring external complex timing circuits. The circuit self-manages the division of the emission period into multiple intervals, using internal signal processing to create the periodic activation pattern. This self-service capability reduces the need for additional external control components, thereby limiting the increase in overall system complexity despite the enhanced emission control functionality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances display quality by stabilizing light emitting intensity and reducing flicker phenomena, without increasing data scan frequency.
Implementation Method 1
The pixel in an example includes a light emitting diode to emit a light
Implementation Method 2
each light emitting diode emits the light within an emission period
Data Source
AI summary
A light emitting device includes a first data line, a first light emitting unit, and a first driving circuit. The first driving circuit is coupled between the first light emitting unit and the first data line. The first driving circuit has a first switch coupled to the first data line. The first switch is controlled to have a first turn-on action and a second turn-on action continuously. During a first time interval between the first turn-on action and the second turn-on action, the first light emitting unit is emitted in at least two first emission periods.