Dual-Transistor Display Pixel Layout for Uniform Luminance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in achieving uniform pixel density and light transmittance across different display areas, leading to variations in image resolution and luminance, which affect display quality.
Innovation Solution
The display device incorporates a pair of driving gate electrodes connected through a connecting member in a different conductive layer, with a storage line extending in a specific direction to overlap the driving gate electrodes, and a double transistor structure for each pixel to enhance driving current and minimize luminance differences between display areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single transistor structure is used in each pixel, then the device complexity is reduced, but the driving current is insufficient leading to luminance differences between display areas
Solution Approach 1:
The pixel circuit is divided into two separate transistor structures (first transistor and second transistor) instead of using a single transistor. This segmentation allows each transistor to contribute to the driving current, thereby increasing the total driving current and reducing luminance differences between display areas while maintaining reasonable device complexity
Solution Approach 2:
The first transistor and second transistor are combined to work together in parallel within the same pixel circuit. Their combined driving current output is connected to the same pixel electrode, effectively merging their contributions to achieve higher overall driving current and improved luminance uniformity across different display areas
2Device complexity
If the scan lines are extended in one direction only, then the routing is simplified, but the signal distribution becomes uneven causing resolution variations
Solution Approach 1:
The scan lines are extended in both first and second directions rather than following a symmetric single-direction pattern. This asymmetric extension strategy allows better adaptation to the display panel geometry, improving signal distribution uniformity and reducing resolution variations while keeping the routing complexity manageable
Solution Approach 2:
Instead of extending scan lines only in one dimension, the patent extends them in two dimensions (first direction and second direction). This dimensional expansion enables more flexible signal distribution across the display area, achieving more uniform resolution without excessive routing complexity
3Illumination intensity
If the pixel electrode area is increased to improve light transmittance, then the luminance is enhanced, but the pixel density decreases affecting resolution
Solution Approach 1:
The patent changes the parameter of driving current instead of pixel electrode area to achieve luminance enhancement. By increasing the driving current through the dual transistor structure, the luminance is improved without changing the pixel electrode area, thereby maintaining pixel density and resolution while achieving the desired light transmittance improvement
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A display device includes a first display area including a plurality of first pixel electrodes, and a second display area including a plurality of second pixel electrodes. A first pitch in a first direction of the plurality of first pixel electrodes is smaller than a second pitch in the first direction of the plurality of second pixel electrodes, and a length in the first direction of the first pixel electrodes is smaller than a length in the first direction of the second pixel electrode.