Staggered Vertical Drive Circuit for Display Pixel Density
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Solution Overview
Problem
As the number of rows of pixels increases in active-matrix display devices, the complexity and scale of the vertical drive circuitry grow, leading to larger peripheral frames and increased short-circuit defects due to denser interconnect patterns, which contradicts the trend towards smaller frame sizes and higher pixel density.
Innovation Solution
The display device employs a configuration where the first vertical drive circuit simultaneously drives two adjacent rows, and the second vertical drive circuit also drives two adjacent rows, with a staggered relationship between them, reducing the scale of the vertical drive circuitry and sharing drive lines between adjacent pixels, thereby simplifying the peripheral circuitry and decreasing the number of drive lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of rows of pixels is increased to enhance definition and density, then the pixel density and definition are improved, but the number of stages of shift registers in the vertical drive circuit increases, leading to larger peripheral frame area
Solution Approach 1:
The patent merges the drive signals for two adjacent rows into a single stage of the shift register. Instead of having one-to-one correspondence between shift register stages and pixel rows, one shift register stage now controls two rows simultaneously, reducing the total number of stages needed and thereby shrinking the peripheral frame area.
Solution Approach 2:
Each stage of the vertical drive circuit is designed to perform multiple functions by simultaneously driving two different rows of pixels. This multi-functionality allows the drive circuit to maintain control over all pixel rows with fewer stages, reducing the overall circuit scale and peripheral area.
2Measurement precision
If the number of rows of pixels is increased to enhance definition, then the pixel definition is improved, but the number of drive lines increases, requiring smaller interconnect patterns and closer spacing, which leads to more short-circuit defects
Solution Approach 1:
The patent combines the drive line requirements for two adjacent rows into a shared set of interconnect patterns. By making the drive lines for two rows identical and simultaneously active, the number of unique interconnect patterns is halved, reducing density and the likelihood of short-circuit defects.
3Quantity of substance
If the vertical drive circuit is enlarged to accommodate more stages for higher pixel density, then the pixel density is improved, but the device complexity and power consumption increase
Solution Approach 1:
The patent merges the functionality of multiple drive circuit stages into fewer stages by making adjacent rows share the same drive signals. This reduces the total number of stages in the vertical drive circuit, thereby reducing device complexity and power consumption while maintaining the ability to drive all pixel rows.
4Quantity of substance
If the vertical drive circuit is enlarged to accommodate more stages for higher pixel density, then the pixel density is improved, but the power consumption increases
Solution Approach 1:
The patent merges the power consumption of adjacent row drive operations into a single simultaneous operation. By driving two rows at once with the same signals, the total power consumption of the vertical drive circuit is reduced compared to sequentially driving each row individually with separate circuit stages.
Data Source
AI summary
Disclosed herein is a display device including: a pixel array part including row first drive lines, row second drive lines, and column signal lines; and a drive part including a horizontal drive circuit, a first vertical drive circuit, and a second vertical drive circuit, wherein the first vertical drive circuit simultaneously drives pixels on two rows adjacent to each other, the second vertical drive circuit simultaneously drives pixels on two rows adjacent to each other, and a pair of rows of the pixels simultaneously driven by the first vertical drive circuit and a pair of rows of the pixels simultaneously driven by the second vertical drive circuit are shifted from each other by one row, for light-emission operation of the pixels on a row-by-row basis.