Non-Rectangular Display Device Luminance Uniformity
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Solution Overview
Problem
In non-rectangular organic EL display devices, variations in horizontal scanning line lengths lead to significant differences in load capacitance between regions, causing differential delays in control signal waveforms and resulting in uneven luminance across the display.
Innovation Solution
The display device is segmented into high-load and low-load regions, where scanning lines in high-load regions are driven by multiple scanning drive circuits and those in low-load regions are driven by a single circuit, thereby reducing differential delays and luminance differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple scanning drive circuits are used to drive scanning lines in all regions, then the load capacitance is reduced and signal waveform quality is improved, but the device complexity and power consumption increase
Solution Approach 1:
The patent applies local quality by differentiating the driving configuration between high-load regions and low-load regions. In high-load regions, multiple scanning drive circuits are used to provide balanced signal waveforms, while in low-load regions, a single scanning drive circuit suffices. This localized adaptation ensures luminance uniformity where needed without unnecessarily increasing device complexity in regions where it is not required.
2Manufacturing precision
If multiple scanning drive circuits are used to drive scanning lines, then differential delay is reduced and luminance uniformity is improved, but power consumption increases
Solution Approach 1:
The patent implements local quality by activating multiple scanning drive circuits only in high-load regions where differential delay causes luminance non-uniformity. In low-load regions, a single scanning drive circuit is used, reducing overall power consumption. This selective approach maintains luminance uniformity in critical areas while minimizing energy consumption across the entire display device.
3Adaptability or versatility
If the display unit has a non-rectangular shape, then design flexibility and application adaptability are improved, but variations in scanning line length cause load capacitance differences and luminance non-uniformity
Solution Approach 1:
The patent addresses the luminance uniformity issue in non-rectangular displays by applying local quality through region-specific driving configurations. The display is divided into high-load regions (where scanning lines are longer and load capacitance is higher) and low-load regions. Multiple scanning drive circuits are deployed in high-load regions to compensate for the increased load and reduce differential delay, thereby maintaining luminance uniformity across the irregular display shape.
Solution Approach 2:
The patent applies segmentation by dividing the non-rectangular display into distinct high-load and low-load regions based on scanning line characteristics. This segmentation allows for targeted application of multiple scanning drive circuits in high-load regions while using a single circuit in low-load regions, effectively managing the luminance uniformity challenge posed by the irregular display shape.
Data Source
AI summary
In a display device having a non-rectangular display unit, occurrence of a difference in luminance between a region with a high load and a region with a low load is suppressed. A region inside the display unit is segmented into a high-load region with a high load on horizontal scanning lines (an initialization control line and a write control line) and a low-load region with a low load on horizontal scanning lines. An initialization control line and a write control line that are disposed in the high-load region are driven by a discharge driver and a scan driver, respectively. An initialization control line and a write control line that are disposed in the low-load region both are driven by, for example, the discharge driver.