Display Panel Gate Driver Voltage Control for Luminance Uniformity
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Solution Overview
Problem
The challenge is to achieve a full-screen display with uniform luminance across areas with different pixel densities in display devices, particularly where a camera module is integrated, as existing solutions result in luminance differences and increased circuit costs due to the need for separate voltage settings and gamma compensation.
Innovation Solution
A display panel design with a pixel array that includes separate gate drivers and a data voltage control unit to manage dynamic voltage ranges for areas with varying pixel densities, using a programmable gamma IC to ensure uniform luminance by adjusting gamma compensation voltages and data voltages accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the resolution or PPI is lowered in areas overlapping the camera module to increase transmittance, then the transmittance is improved, but the luminance uniformity deteriorates due to luminance differences between areas
Solution Approach 1:
The patent applies local quality by setting different data voltages for different display areas. Specifically, pixels in the first area (overlapping camera module) are assigned a first data voltage while pixels in the second area (non-overlapping) are assigned a second data voltage, allowing each area to have optimized characteristics for its specific function while maintaining overall luminance uniformity.
2Stability of the object's composition
If different data voltages are set for different areas to reduce luminance differences, then the luminance uniformity is improved, but the grayscale expression power deteriorates
Solution Approach 1:
The patent employs parameter changes by dynamically adjusting the data voltage values assigned to different display areas based on their specific requirements. The first data voltage for the camera-overlapping area is optimized for high transmittance while the second data voltage for the normal area is optimized for grayscale expression, allowing each area to operate at its optimal parameter set.
3Stability of the object's composition
If multiple programmable gamma ICs are used to independently set gamma compensation voltage for each area, then the luminance uniformity is improved, but the circuit cost increases
Solution Approach 1:
The patent applies merging by integrating the gamma compensation control for multiple display areas into a single programmable gamma IC. This unified approach allows the system to maintain independent voltage control for different areas while reducing the overall circuit complexity and cost compared to using separate gamma ICs for each area.
Data Source
AI summary
The present disclosure relates to a display panel and a display device using the same. The display panel includes a pixel array in which a plurality of data lines, a plurality of gate lines crossing the data lines, and a plurality of pixels are disposed; a first gate driver configured to supply a gate signal to gate lines connected to pixels disposed in a first area of the pixel array; and a second gate driver configured to receive a carry signal from the first gate driver and supply a gate signal to gate lines connected to pixels disposed in a second area of the pixel array. The second gate driver includes a signal transmission unit disposed in the pixel array to receive the carry signal from the first gate driver.