Electroluminescent Display Emission Duty and Voltage Control
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Solution Overview
Problem
Electroluminescent display devices face issues with picture quality deterioration, including low luminance uniformity and afterimage in low luminance sections, as well as luminance reversal phenomena.
Innovation Solution
The solution involves an electroluminescent display device with a DBV adjuster, duty adjuster, and power adjuster that output brightness data and adjust emission duty and low source voltage according to user inputs, dividing screen luminance into sections to optimize emission duty and voltage, ensuring the emission duty gradually increases to less than 100% in low luminance sections and is fixed at the upper limit in higher luminance sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If emission duty is increased to improve luminance in low luminance section, then luminance uniformity is improved, but luminance reversal phenomenon occurs
Solution Approach 1:
The patent changes the emission duty parameter from a fixed 100% value to a variable value that is dynamically adjusted based on the current luminance level. Specifically, when the current luminance is below a threshold, the emission duty is set to a first value (less than 100%), and when the current luminance is above the threshold, the emission duty is set to a second value (100%). This parameter change prevents luminance reversal while maintaining luminance uniformity.
2Illumination intensity
If emission duty is set to 100% to maximize brightness, then luminance output is maximized, but luminance uniformity deteriorates in low luminance section
Solution Approach 1:
The patent makes the emission duty dynamic rather than static. Instead of always using 100% emission duty, the system dynamically adjusts the emission duty based on real-time luminance feedback. When luminance is low, a reduced emission duty (first value) is applied to prevent luminance reversal and improve uniformity. When luminance is sufficient, the emission duty returns to 100% (second value) to maximize brightness output.
3Illumination intensity
If brightness is increased to improve image quality, then picture quality improves, but power consumption increases
Solution Approach 1:
The patent optimizes power consumption by dynamically adjusting the emission duty parameter based on actual luminance conditions. Instead of continuously operating at 100% emission duty (which maximizes power consumption), the system reduces the emission duty to a first value when luminance requirements are met with lower duty cycles, thereby reducing power consumption while maintaining adequate picture quality. When higher brightness is needed, the emission duty increases to a second value (100%).
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 improves image quality by reducing luminance reversal and enhancing luminance uniformity, allowing for smooth and natural brightness changes across all luminance levels while minimizing power consumption.
Implementation Method 1
An electroluminescent display device includes pixels arranged in a matrix form and displays an image by causing light-emitting elements included in the pixels to emit light
Data Source
AI summary
An electroluminescent display device includes a display panel including a plurality of pixels each including a light-emitting element, a display brightness value adjuster configured to output brightness data with different values according to user inputs to adjust screen luminance of the display panel, a duty adjuster configured to adjust an emission duty of the light-emitting element according to the brightness data, and a power adjuster configured to adjust a low-level source voltage to be applied to the pixels within a preset power supply voltage range according to the brightness data, wherein the emission duty of the light-emitting element gradually increases from 0% to an upper limit set to be less than 100%.