Display Panel With Segmented Cathode Electrodes For Luminance Uniformity
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Solution Overview
Problem
Existing display panels face challenges in achieving uniform luminance across the screen, particularly in areas with low pixels per inch (PPI), leading to uneven image quality and increased power consumption.
Innovation Solution
The display panel incorporates a design with separate cathode electrodes for high and low PPI areas, allowing for distinct voltage applications. A sensor module is also integrated under the display panel to capture images through the low PPI area, enabling a full-screen display without compromising image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single cathode electrode is used for both high PPI and low PPI areas, then device complexity is reduced, but luminance uniformity deteriorates due to insufficient voltage margin in low PPI areas
Solution Approach 1:
The cathode electrode is segmented into first and second cathode electrodes, where the first cathode electrode is connected to a first low-potential power voltage and the second cathode electrode is connected to a second low-potential power voltage. This segmentation allows independent voltage control for high PPI and low PPI areas, ensuring sufficient voltage margin in low PPI areas for transistor saturation operation, thereby achieving uniform luminance across the display panel.
2Stability of the object's composition
If voltage margin is increased in low PPI area, then luminance uniformity is improved, but power consumption increases
Solution Approach 1:
Different low-potential power voltages are applied to different regions: the first cathode electrode (high PPI area) uses a first low-potential power voltage, while the second cathode electrode (low PPI area) uses a second low-potential power voltage with a larger voltage margin. This local quality approach ensures sufficient voltage margin only where needed (low PPI area) to maintain transistor saturation and luminance uniformity, while avoiding unnecessary power consumption in high PPI areas.
3Adaptability or versatility
If sensor module is added under display panel, then full-screen display capability is improved, but device complexity increases
Solution Approach 1:
The sensor module is positioned in the space beneath the display panel, utilizing the vertical dimension rather than occupying screen real estate. This allows the display panel to maintain full-screen display capability while accommodating the sensor module in the low PPI area, effectively using unused spatial resources to add functionality without compromising display area.
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 ensures uniform luminance across the entire screen by operating the driving elements in their saturation regions, improving image quality and reducing power consumption by securing a sufficient voltage margin between pixel driving and low-potential power voltages.
Implementation Method 1
a sensor module disposed under the rear surface of the display panel to convert light incident through the second pixel area into an electrical signal
Data Source
AI summary
The present disclosure relates to a display panel and a display device using the same, and includes a first pixel area in which pixels connected to a first cathode electrode are disposed, and a second pixel area in which pixels connected to a second cathode electrode are disposed. A data voltage of pixel data to be written to a pixel in the second pixel area is applied to a first gate electrode of a driving element disposed in the second pixel area. A compensation voltage for increasing the luminance of the second pixel area is applied to the gate electrode of the driving element.