Display Device Potential Lines Gray-Scale Resistance
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Solution Overview
Problem
The increasing size and resolution of display devices, especially those with pixel circuits, face reduced manufacturing yield due to short circuits between electrodes caused by foreign substances, leading to variations in display luminance and defects.
Innovation Solution
A display device with multiple pixels, each including display elements and potential lines maintained at different gray-scale potentials, where the first potential lines have a lower resistance for a steeper luminance gradient and the second potential lines have a higher resistance for a gentler gradient, allowing the driving section to supply gray-scale potentials based on image signals to manage luminance variations and prevent line defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display device size and resolution are increased, then the display quality is improved, but the manufacturing yield is reduced due to short circuits between electrodes
Solution Approach 1:
The patent applies local quality by differentiating the resistance characteristics of potential lines based on their functional requirements. First potential lines (for black gray-scale) have lower resistance to suppress luminance variations, while second potential lines (for white gray-scale) have higher resistance to achieve desired luminance levels. This localized differentiation of electrical properties optimizes both display quality and manufacturing robustness.
Solution Approach 2:
The patent changes the resistance parameter of potential lines to address manufacturing yield issues. By setting different resistance values for different gray-scale potential lines, the system compensates for variations caused by short circuits and foreign substances, thereby improving manufacturing yield while maintaining high resolution.
2Adaptability or versatility
If pixel circuits are added to each pixel, then the display functionality is enhanced, but the occurrence of short circuits and manufacturing defects increases
Solution Approach 1:
The patent introduces local quality by assigning different resistance characteristics to potential lines serving different gray-scale levels. This differentiation allows the system to tolerate variations and defects introduced by pixel circuits, as the lower resistance first potential lines can compensate for leakage and short circuit effects, thereby improving manufacturing yield while maintaining enhanced display functionality.
3Measurement precision
If the resistance of potential lines is reduced, then the luminance gradient becomes steeper and display precision is improved, but the sensitivity to potential variations increases
Solution Approach 1:
The patent applies local quality by assigning different resistance values to potential lines based on their specific functional roles. First potential lines for black gray-scale have lower resistance to achieve steep luminance gradients and high precision, while second potential lines for white gray-scale have higher resistance to maintain potential stability. This localized optimization resolves the contradiction between precision and stability.
Solution Approach 2:
The patent uses equipotentiality principles by maintaining appropriate resistance levels to ensure stable potential distribution. The higher resistance second potential lines help maintain equipotential conditions for white gray-scale, reducing sensitivity to potential variations, while the lower resistance first potential lines provide stable reference potentials for black gray-scale.
Data Source
AI summary
A display device includes: pixels each including a display element; potential lines maintained at respective gray-scale potentials different from one another, the potential lines including first potential lines each maintained at a first gray-scale potential level allowing a luminance gradient to be relatively steep and second potential lines each maintained at a second gray-scale potential level allowing a luminance gradient to be relatively gentle, the luminance gradient representing a magnitude of a display luminance variation caused by a variation in a voltage or current applied to the display element; and a driving section performing display drive on the pixels based on an image signal, through supplying the display element of each of the pixels with a gray-scale potential level of selected one of the plurality of potential lines. A resistance of the first potential line is lower than a resistance of the second potential line.