Dual Bank Display Stitch Pattern for Luminance Uniformity
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Solution Overview
Problem
The dual bank method for display devices, which divides the display panel into two regions and applies data voltage from both sides, often results in luminance differences between the upper and lower regions, causing a horizontal line to be visible at the boundary, especially when the same gray level is displayed.
Innovation Solution
A method of data processing in the dual bank method that involves a stitch pattern, where the data of the data processing region adjacent to the horizontal center line is processed to mix the luminance difference vertically, using a stitch pattern that adjusts gray levels in unit blocks on either side of the center line to minimize the visibility of the horizontal line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the dual bank method is used to transmit data voltage from both sides of the display panel, then the charging time of pixels is sufficiently secured and data processing capacity is increased, but luminance differences are generated between upper and lower regions causing visible horizontal lines at the boundary
Solution Approach 1:
The patent applies local quality by dividing the display panel into multiple regions (first region, second region, and boundary region) and applying different gray level adjustments to each region. Specifically, pixels in the boundary region adjacent to the horizontal center line receive different gray level corrections compared to pixels in the upper or lower regions, thereby locally compensating for luminance differences at the critical boundary area while maintaining normal operation in other regions.
Solution Approach 2:
The patent changes the gray level parameter dynamically based on pixel location. By detecting whether a pixel lies in the boundary region near the horizontal center line, the system adjusts the gray level of that pixel differently from non-boundary pixels. This parameter change approach allows the same display content to be rendered with region-specific adjustments, compensating for luminance non-uniformity caused by the dual bank method without requiring separate display contents for different regions.
2Speed
If data drivers are formed at opposing sides of the display panel, then high-rate driving is achieved, but differences in driving voltages and signal delays are generated between data drivers
Solution Approach 1:
The patent implements a feedback mechanism where the system detects the location of pixels relative to the horizontal center line and determines whether they belong to the boundary region. Based on this detection feedback, the system automatically adjusts the gray level of affected pixels to compensate for luminance differences. This closed-loop approach ensures that signal consistency is maintained across both data drivers despite inherent differences in driving voltages and signal delays.
Data Source
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AI summary
A display device includes a display panel (300) comprising a plurality of first data lines extending from a first data driver (520a) disposed in a first display panel region on a first side of the horizontal center line (CL) and a plurality of second data lines extending from a second data driver (520b) disposed in a second display panel region on a second side of the horizontal center line opposite the first side. A data processing region (TA) is disposed in a vicinity of a horizontal center line of the display panel and includes a plurality of pixels. Data processing for changing gray levels of data for a portion of the plurality of pixels of the data processing region is carried out according to the information on a stitch pattern, the stitch pattern comprising one or more unit patterns (PU). As a result, any luminance difference based on the horizontal center line (CL) is vertically mixed, so that it is possible to decrease the viewing of a distortion in the vicinity of the horizontal center line (CL).