Display Voltage Line Arrangement for Luminance Uniformity
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Solution Overview
Problem
Organic light emitting display apparatuses experience uneven luminance due to increased potential difference, causing higher luminance at the lower end of the screen, which results in non-uniformity.
Innovation Solution
The arrangement of low potential voltage and high potential voltage lines in parallel in the non-display area at the lower end of the display area helps reduce the potential difference, preventing luminance increase by dispersing the electric field and minimizing charge induction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the driving voltage is raised to increase luminance, then the luminance of the display increases, but the potential difference increases causing induced charge and non-uniform luminance distribution
Solution Approach 1:
The patent applies the equipotentiality principle by introducing a low potential voltage line in parallel with the high potential voltage line in the non-display area. This creates a more uniform potential distribution, reducing the potential difference and preventing induced charge accumulation that causes luminance non-uniformity. The parallel arrangement of high and low potential lines establishes equipotential regions that stabilize the electric field distribution across the display.
2Reliability
If high potential voltage line is placed close to display area to reduce resistance, then electrical connection efficiency improves, but electric field intensity increases causing charge induction and luminance increase at lower portion
Solution Approach 1:
The patent applies the counterweight principle by placing a low potential voltage line adjacent to the high potential voltage line in the non-display area. The low potential line acts as a counterbalancing element that offsets the strong electric field generated by the high potential line, preventing excessive charge induction in the display area while maintaining efficient electrical connection.
Solution Approach 2:
The low potential voltage line serves as an intermediary element between the high potential voltage line and the display area. It mediates the electric field distribution, preventing the harmful effects of direct high potential exposure to the display region while maintaining the benefits of efficient voltage transmission.
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 effectively prevents luminance non-uniformity by reducing the electric field intensity and charge induction, maintaining consistent luminance across the screen.
Implementation Method 1
the potential difference between the high potential voltage and the low potential voltage is also raised. The amount of the electric charge accumulated in a substrate or a lower layer is increased by the potential difference and an induced charge is generated in an adjacent region by the increase in the amount of charge
Data Source
AI summary
A display apparatus comprises a display panel having a display area configured to display an image and a non-display area around the display area, a low potential voltage line in the non-display area, and a high potential voltage line between the display area and the low potential voltage line.