Silicon OLED Substrate MOSFET Compensation Layout
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Solution Overview
Problem
The manufacturing process of silicon-based OLED display devices faces challenges in achieving uniform display brightness due to the small size and large number of driving MOSFETs, which affects the display effect, especially in high PPI applications like AR/VR devices.
Innovation Solution
A silicon-based OLED display substrate with a drive circuit layer that includes a storage unit for compensation voltage of each MOSFET, where the storage unit, electrical connection bonding area, and drive circuit are non-overlapping, allowing for independent formation and positioning to ensure uniform voltage compensation and improved brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the size of pixels is reduced to achieve ultra-high PPI, then the display resolution is improved, but the driving MOSFETs become smaller and more numerous leading to greater manufacturing variations
Solution Approach 1:
The patent implements a feedback mechanism by measuring the actual threshold voltage of each MOSFET during manufacturing and storing these values in compensation storage units. The drive circuit then uses this stored compensation data to adjust and equalize the driving voltage for each pixel, compensating for manufacturing variations and achieving uniform display brightness across all pixels.
Solution Approach 2:
The patent performs preliminary characterization of each MOSFET's threshold voltage during the manufacturing process and pre-stores compensation values in dedicated storage units before the display device is assembled. This preliminary action allows the system to be pre-compensated for manufacturing variations, eliminating the need for post-assembly calibration and ensuring uniform performance from the start.
2Manufacturing precision
If compensation storage units are added to each pixel to store threshold voltage data, then MOSFET uniformity is improved, but the device complexity increases
Solution Approach 1:
The patent resolves the complexity issue by transitioning from a planar two-dimensional layout to a three-dimensional stacked architecture. The compensation storage units, drive circuit, and pixel array are arranged in different vertical layers, allowing independent optimization of each layer without increasing the horizontal footprint. This vertical stacking enables high PPI display resolution while accommodating complex compensation circuits without proportionally increasing overall device complexity.
Data Source
AI summary
A silicon-based OLED display substrate, a manufacturing method thereof and a display device are provided. The display substrate includes: a silicon-based base and a device layer arranged on the silicon-based base. The silicon-based base includes a drive circuit layer. The drive circuit layer includes a drive circuit, an electrical connection bonding area, and a storage unit storing compensation voltage of each MOSFET of the drive circuit. An orthographic projection of the drive circuit on the silicon-based base, an orthographic projection of the storage unit on the silicon-based base, and an orthographic projection of the electrical connection binding area on the silicon-based base do not overlap with each other.