Pixel Driving Circuit Brightness Control
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Solution Overview
Problem
Existing display technologies face challenges in adjusting brightness effectively, particularly at low brightness levels, where PWM methods cause eye strain and DC methods are affected by sub-threshold swing fluctuations, leading to poor display quality.
Innovation Solution
A pixel driving circuit with a light-adjusting circuit that adjusts the light-emitting current by controlling the conductivity of a junction field effect transistor, allowing for precise brightness control without relying on the driving transistor's current fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If PWM light adjustment method is used, then brightness can be adjusted, but frequent flickering occurs at low adjustment frequency which is harmful to human eyes
Solution Approach 1:
The patent applies periodic action by using PWM (pulse width modulation) to control the light-emitting element, where the duty cycle of the periodic signal is adjusted to control brightness. This allows brightness adjustment while maintaining a relatively high frequency to avoid visible flickering and eye strain.
2Illumination intensity
If DC light adjustment method is used, then brightness can be adjusted, but display quality deteriorates at low brightness due to sub-threshold swing fluctuations
Solution Approach 1:
The patent introduces a light-adjusting circuit as an intermediary component between the driving circuit and the light-emitting element. This light-adjusting circuit independently controls the light-emitting current, acting as a mediator that decouples the brightness control from the driving transistor's sub-threshold swing fluctuations, thereby maintaining display quality at low brightness levels.
3Illumination intensity
If driving current is reduced for DC light adjustment, then brightness decreases, but sub-threshold swing fluctuations increase leading to poor display effect
Solution Approach 1:
The patent segments the current control function by separating the driving transistor's role from the light-emitting current control. The light-adjusting circuit is divided into independent control modules that specifically manage the light-emitting current, allowing brightness reduction without relying on reducing the driving current, thus avoiding sub-threshold swing fluctuations and maintaining display reliability.
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 solution provides stable and ideal light-emitting brightness, reducing eye strain and improving display quality by independently controlling the light-emitting current, thus avoiding the limitations of sub-threshold swing fluctuations.
Implementation Method 1
adjusting, by the light-adjusting circuit, a value of the light-emitting current by the light-adjusting voltage
Data Source
AI summary
A pixel driving circuit and a method for driving the same, a display panel, and a display device are described. The pixel driving circuit includes a driving circuit and a light-adjusting circuit. The driving circuit is configured to provide a light-emitting current to a light-emitting element. The light-adjusting circuit is arranged between the driving circuit and the light-emitting element, and configured to adjust a value of the light-emitting current.