Display Device Corner Luminance Compensation
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Solution Overview
Problem
Display devices with non-right angular corners experience reduced light transmittance due to light blocking members, leading to color shifts and recognition of corners as step shapes.
Innovation Solution
A display device with a signal controller that adjusts gray values of subpixels at non-right angular corners based on light transmittance values, using correction coefficients to compensate for differences in light transmittance and prevent color shifts and step shape recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a light blocking member is positioned at the boundary of the display area to create a non-right angular corner shape, then the display device achieves a rounded corner appearance, but light transmittance of subpixels at the corner is reduced causing color shifts
Solution Approach 1:
The patent applies local quality by assigning different gray values to different subpixels based on their specific light transmittance characteristics. The signal controller identifies subpixels at non-right angular corners with reduced light transmittance and applies compensatory gray value adjustments only to those specific subpixels, rather than uniformly adjusting all subpixels. This localized adjustment maintains the rounded corner shape while compensating for the reduced light transmittance at affected positions.
2Shape
If light transmittance of subpixels at the corner is reduced by the light blocking member, then the corner shape is defined, but color shift occurs due to unequal light transmission through different subpixels
Solution Approach 1:
The patent employs parameter changes by dynamically adjusting the gray value parameter for subpixels based on their light transmittance characteristics. The signal controller modifies the gray value parameter for subpixels at non-right angular corners to compensate for reduced light transmittance, ensuring that the perceived luminance and color remain consistent across all subpixels despite the physical obstruction. This parameter adjustment prevents color shifts while maintaining the desired corner shape.
3Manufacturing precision
If gray values of subpixels at the corner are adjusted to compensate for light transmittance differences, then color shift is prevented, but the device complexity increases due to additional control mechanisms
Solution Approach 1:
The patent applies preliminary action by pre-storing light transmittance data for each subpixel in a memory unit before image display. The signal controller reads the appropriate light transmittance data based on the current display position and pre-calculates the necessary gray value adjustments. This preliminary preparation of transmittance data and adjustment parameters simplifies the real-time control process, reducing the computational complexity during actual image rendering while maintaining color accuracy.
4Manufacturing precision
If correction coefficients are calculated and applied to adjust image signals for subpixels at the corner, then color accuracy is improved, but the processing time and computational load increase
Solution Approach 1:
The patent implements preliminary action by pre-calculating and storing light transmittance data for all subpixels in memory before image display operations. When displaying images, the signal controller simply retrieves the pre-stored transmittance data for corner subpixels and applies the corresponding gray value adjustments, rather than calculating correction coefficients in real-time. This approach significantly reduces processing time during actual image rendering while maintaining color accuracy through the pre-computed correction values.
Data Source
AI summary
A display device includes a display unit including a plurality of pixels, each of the pixels including a plurality of subpixels, and a display area having a corner of a non-right angular shape, and a signal controller controlling the display unit to display an image based on an input image signal and a control signal and changing a gray value of the image signal based on different light transmittance values of subpixels included in a first pixel, among the plurality of pixels, positioned at the corner of the non-right angular shape if the image signal corresponds to the first pixel at the corner of the non-right angular shape.