Parallel Auxiliary Circuits for AMOLED Display Luminance Uniformity
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Solution Overview
Problem
In AMOLED display panels, the reduced non-display area leads to narrow spaces for lines, resulting in excessive resistance and uneven luminance due to inconsistent current flow, causing high luminance near the signal end and low luminance away from it.
Innovation Solution
The addition of parallel auxiliary circuits in the non-display area for both anode and cathode traces increases current flow, reducing resistance and voltage drops, thereby enhancing luminance uniformity across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the non-display area is reduced to increase display area, then the display area is increased, but the line space in non-display area is reduced resulting in excessive resistance
Solution Approach 1:
The patent divides the power supply circuit into multiple parallel paths by introducing auxiliary power supply lines (VDD_AUX1, VDD_AUX2) alongside the main power supply lines. This segmentation allows current to flow through multiple routes, reducing the resistance burden on individual lines and enabling adequate current delivery even when line dimensions are constrained by reduced non-display area.
2Area of stationary object
If the line space is narrow due to reduced non-display area, then the display area is maximized, but the current flow becomes inconsistent causing uneven luminance
Solution Approach 1:
The patent implements local quality by strategically placing auxiliary power supply lines at different locations across the display panel. The first auxiliary line (VDD_AUX1) is positioned to serve a first region of the display area, while the second auxiliary line (VDD_AUX2) serves a second region. This localized approach ensures that each region receives adequate current through its nearest auxiliary line, compensating for the narrow line spacing and preventing luminance non-uniformity across different areas of the display.
Solution Approach 2:
The patent addresses the two-dimensional constraint of narrow line spacing by introducing additional conductive paths that extend into the display area from the non-display area. The auxiliary power supply lines traverse different portions of the display area, effectively adding dimensional coverage and ensuring comprehensive current distribution across the entire display surface, thereby achieving uniform luminance despite limited non-display area.
Data Source
AI summary
The disclosure provides a display panel including: the display substrate including a display area and a non-display area. The non-display area is provided therein with a first circuit and a second circuit extending to the display area respectively. The non-display area is further provided therein with a first auxiliary circuit electrically connected in parallel with the first circuit and/or a second auxiliary circuit electrically connected in parallel with the second circuit.