Light Emitting Display Voltage Compensation for IR Drop
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Solution Overview
Problem
Large display devices experience deviations in IR drop, leading to non-uniform brightness and reduced driving stability, particularly in high-brightness and high-current applications, which affects the lifespan and performance of light emitting display devices.
Innovation Solution
A light emitting display device with a power supply that compensates for the first potential voltage based on feedback from a switch circuit unit, which senses and adjusts the voltage across the display panel, ensuring uniformity and stability by mitigating IR drop effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the size of the display panel is increased to meet large display device trends, then the display area and visibility are improved, but IR drop deviation occurs leading to non-uniform brightness
Solution Approach 1:
The power supply voltage compensation is segmented by scan line groups. The display panel is divided into multiple scan line groups, and each group is compensated independently through separate sensing and feedback circuits, allowing localized correction of IR drop variations across different regions of the large display panel.
Solution Approach 2:
Different compensation values are applied to different scan line groups based on their specific IR drop characteristics. The power supply adjusts the first potential voltage for each scan line group individually, creating local quality variations in the compensation strategy to match the spatial distribution of IR drop effects across the panel.
2Illumination intensity
If the first potential voltage is increased to achieve high brightness, then the brightness performance is improved, but IR drop deviation increases leading to reduced driving stability
Solution Approach 1:
A feedback circuit senses the first potential voltage at multiple locations across the display panel and feeds this information back to the power supply. The power supply uses this feedback to dynamically adjust and compensate for IR drop variations, maintaining stable voltage delivery even at high current levels required for high brightness operation.
Solution Approach 2:
The system performs preliminary sensing of the first potential voltage before compensation is applied. By sensing the voltage levels and calculating compensation values in advance, the power supply can proactively correct IR drop effects before they cause brightness non-uniformity or driving instability.
3Device complexity
If a simple power supply configuration is used, then the device complexity is reduced, but IR drop compensation capability is insufficient leading to brightness non-uniformity
Solution Approach 1:
Instead of a single complex full-panel compensation circuit, the system segments the compensation function into multiple simpler scan line group-specific circuits. Each group has its own sensing and compensation mechanism, reducing the complexity of individual circuits while collectively achieving comprehensive panel-wide brightness uniformity.
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
The solution effectively prevents and compensates for IR drop deviations, enhancing the uniformity of brightness and extending the lifespan and driving stability of light emitting display devices, especially in large and high-brightness applications.
Implementation Method 1
a switch circuit unit configured to sense the first potential voltage applied to the display panel and to feedback the first potential voltage to the power supply
Implementation Method 2
the power supply compensates for the first potential voltage based on the first potential voltage fed back from the switch circuit unit and to output the compensated first potential voltage
Data Source
AI summary
A light emitting display device includes a display panel, a power supply configured to supply a first potential voltage and a second potential voltage to the display panel, and a switch circuit unit configured to sense the first potential voltage applied to the display panel and to feedback the first potential voltage to the power supply, wherein the power supply compensates for the first potential voltage based on the first potential voltage fed back from the switch circuit unit and to output the compensated first potential voltage.