Pentile Display Edge Luminance Compensation via Buffer Rendering
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Solution Overview
Problem
Display devices with pentile structures face luminance distribution defects due to physical pixel shortages at vertical and horizontal edge regions, affecting display quality.
Innovation Solution
A display device and method that include a display unit with a buffer unit to store and distribute luminance data, using sub-pixel rendering filters to enhance luminance data of absent pixels, ensuring a sum of filter coefficients greater than or equal to 1, thereby preventing luminance distribution defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a pentile structure is used to reduce the number of sub-pixels, then device complexity is reduced, but luminance distribution uniformity deteriorates at edge regions
Solution Approach 1:
The patent applies preliminary action by storing luminance data of the last pixel column in a buffer unit before processing the next pixel column. This allows the rendering unit to retrieve and utilize the stored luminance data when generating display data for the next column, ensuring that edge regions receive appropriate luminance compensation in advance, thus preventing luminance distribution defects at vertical and horizontal edges.
Solution Approach 2:
The patent uses copying by creating virtual luminance data for an absent pixel column adjacent to the last pixel column. The rendering unit copies luminance data from the last pixel column stored in the buffer unit and uses it to generate display data for the absent pixel column, which is then merged with the actual next pixel column data. This copying approach compensates for the missing sub-pixels at edge regions without requiring additional physical pixels.
2Stability of the object's composition
If sub-pixel rendering is applied to compensate for edge regions, then luminance distribution uniformity is improved, but device complexity increases due to additional processing units
Solution Approach 1:
The patent applies merging by combining the luminance data from the last pixel column (stored in the buffer unit) with the display data of the next pixel column. The rendering unit merges the copied luminance data with the actual pixel data, allowing edge regions to benefit from luminance compensation while using the same processing unit that handles normal pixel rendering, thus avoiding the need for separate dedicated processing units.
Solution Approach 2:
The rendering unit in the patent performs multiple functions: it processes normal pixel columns using standard rendering algorithms and simultaneously handles edge region compensation by retrieving and merging luminance data from the buffer unit. This multi-functionality allows a single processing unit to maintain luminance distribution uniformity across the entire display, including edge regions, without requiring additional specialized processing units.
Data Source
AI summary
A display device includes a display unit including a first pixel having a first color sub-pixel and a second color sub-pixel and a second pixel having a third color sub-pixel and another second color sub-pixel, an input gamma unit that converts first through third color grayscale data into first through third color luminance data, a buffer unit that stores the first through third color luminance data of a last pixel-column, a vertical rendering unit that increases the first and third color luminance data of the last pixel-column by using the first through third color luminance data of the last pixel-column as first and third color luminance data of an absent pixel-column adjacent to the last pixel-column, and an output gamma unit that converts the first through third color luminance data into the first and second color grayscale data or the third and second color grayscale data.