Display Device Bias Voltage Control for Luminance Consistency
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Solution Overview
Problem
Display devices with varying pixel densities suffer from degraded display quality due to differences in luminance across different areas, despite equal light emission from pixels.
Innovation Solution
A display device with a gate driver and data driver that provide specific gate signals and data voltages in an address-scan period, and bias voltages in a self-scan period, using a look-up table to determine bias data and apply different bias voltages to areas with different pixel densities, ensuring consistent luminance across all areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different pixel densities are used in different display areas, then the display device can be manufactured with varied resolutions and sizes, but the luminance consistency across areas is degraded
Solution Approach 1:
The patent applies local quality by providing different bias voltages to different display areas having different pixel densities. The data driver identifies specific display areas (e.g., first display area with first pixel density, second display area with second pixel density) and applies customized bias voltages to each area to compensate for the luminance differences caused by varying pixel densities, thereby achieving uniform overall luminance across the entire display.
Solution Approach 2:
The patent changes the bias voltage parameter to compensate for pixel density variations. By adjusting the bias voltage applied to pixels in different display areas, the system compensates for the luminance differences that arise from different pixel densities, maintaining consistent visual output across the entire display surface.
2Device complexity
If a single bias voltage is applied to all pixels, then the device complexity is reduced, but the display quality is degraded due to luminance differences in areas with different pixel densities
Solution Approach 1:
The patent segments the display into multiple display areas, each with potentially different pixel densities. The data driver is configured to identify these separate areas and apply different bias voltages to each segment, allowing precise control over luminance in each region while maintaining overall display quality.
Solution Approach 2:
The patent implements local quality control by applying different bias voltages to different display areas based on their specific pixel density characteristics. This localized approach ensures that each area contributes appropriately to the overall luminance, achieving high display quality without requiring complete redesign of the entire system.
3Illumination intensity
If bias voltages are adjusted for different pixel densities, then the luminance consistency is improved, but the device complexity increases due to additional control circuits
Solution Approach 1:
The data driver is designed with multi-functionality, serving both as a data input interface and as a bias voltage generation and distribution system. By integrating the bias voltage generation function within the existing data driver structure, the patent avoids adding separate complex control circuits while still achieving the capability to provide different bias voltages to different display areas.
Solution Approach 2:
The data driver performs self-service by generating and distributing the appropriate bias voltages to different display areas based on its own internal logic and control signals. This eliminates the need for external dedicated bias voltage generation circuits, reducing overall system complexity while maintaining the ability to compensate for pixel density variations.
Data Source
AI summary
A display device includes: a display panel which includes a plurality of display areas having different pixel densities from each other, where each of the display areas includes a plurality of pixels; a gate driver, which provides a first gate signal and a second gate signal to each of the pixels; and a data driver, which provides data voltages to the pixels in an address-scan period and provides different bias voltages to the display areas, respectively, in a self-scan period following the address-scan period.