Emission Panel Aging Uniformity via Local Current Density Control
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Solution Overview
Problem
Emission panels with organic EL elements face positional variation in aging levels due to inconsistent current supply, leading to brightness unevenness and color irregularity, as the entire surface is lit during aging, causing differential aging rates among pixels.
Innovation Solution
A method is introduced where correction coefficients are acquired and applied to adjust the voltages across pixels to ensure uniform current flow, moderating the aging process by using a control panel to calculate and apply correction coefficients based on measured currents and positions, thereby reducing positional variation in aging levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the entire emission elements are lit to perform aging of the emission panel, then the aging process can be executed efficiently, but positional variation in the aging level occurs leading to brightness unevenness and color irregularity
Solution Approach 1:
The patent applies local quality by dividing the emission panel into multiple display regions (first display region and second display region) and applying different current densities to each region. Specifically, a first current density is applied to pixels in the first display region while a second current density, which is smaller than the first, is applied to pixels in the second display region. This localized differentiation of current density ensures uniform aging across the entire panel by compensating for positional variations, thereby resolving the contradiction between efficient aging processing and uniform aging quality.
2Manufacturing precision
If different current densities are applied to different display regions, then uniform aging can be achieved, but the complexity of the aging control system increases
Solution Approach 1:
The patent applies segmentation by dividing the emission panel into multiple display regions (first display region and second display region) with different current density requirements. This segmentation allows the aging control system to manage complexity by treating different regions independently with appropriate current densities, achieving uniform aging while maintaining manageable system complexity through regional decomposition.
Solution Approach 2:
The patent applies parameter changes by varying the current density parameter across different display regions during aging. A first current density is applied to the first display region and a second current density (smaller than the first) is applied to the second display region. This parameter differentiation enables precise control over aging uniformity while keeping the control system relatively simple through systematic parameter management.
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 method effectively reduces positional variation in aging levels, ensuring uniform brightness and color consistency across the emission panel by correcting voltage values applied to pixels, thereby improving the manufacturing efficiency and display quality.
Implementation Method 1
An emission panel using emission elements emits light to display an image
Data Source
AI summary
A method for manufacturing an emission panel which has an emission portion including pixels, through which currents of mutually different values flow under a condition that voltages of mutually identical values are applied to the respective pixels is disclosed. This manufacturing method includes: an acquisition step of acquiring correction coefficients for correcting the values of the voltages applied to the respective pixels to reduce differences among the values in current flowing through the respective pixels; and an aging step of executing aging processing on the pixels, the aging processing being executed by correcting the values of the voltages applied to the respective pixels using the correction coefficients and by applying the corrected voltages to the respective pixels.