Cluster Pixel Circuit PWM Signal Distribution
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Solution Overview
Problem
Current digital display systems face challenges in improving characteristics such as resolution, processing time, manufacturing cost, and response speed, particularly in the driving circuit for LED displays used in diverse applications like vehicles and AR/VR devices.
Innovation Solution
A cluster pixel circuit is introduced, featuring a row terminal for PWM clock signals and a column terminal for N-bit data, with individual pixel drivers that enable efficient data shifting and PWM signal input across multiple pixels, reducing the number of contact points and improving signal distribution through a common interface-based design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If individual pixel drivers are used for each pixel, then response speed and control precision are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The display device is divided into multiple pixel clusters, with each cluster containing multiple pixels sharing common driving circuits. This segmentation allows individual cluster control while reducing overall complexity compared to fully independent pixel drivers.
Solution Approach 2:
Multiple pixels within a cluster share common driving circuits including voltage generation units and switching transistors. This merging of functions reduces the number of independent components needed while maintaining individual pixel controllability through selective activation.
2Measurement precision
If more contact points are provided for each pixel, then signal distribution and control precision are improved, but manufacturing cost and device complexity increase
Solution Approach 1:
Common driving circuits serve multiple pixels within a cluster, making these circuits universal resources. The same voltage generation unit and switching transistors can control different pixels by selective activation, reducing the need for dedicated components for each pixel.
Solution Approach 2:
The patent introduces a cluster-level organization dimension above the individual pixel level. Instead of providing separate contact points for each pixel, the system uses cluster contact points that can be selectively activated to control individual pixels within the cluster, effectively adding a hierarchical control dimension.
3Ease of manufacture
If electrical wiring is simplified, then manufacturing cost is reduced, but signal distribution efficiency may worsen
Solution Approach 1:
Voltage generation units pre-generate the necessary voltage levels (ELVDD, ELVSS, and intermediate voltages) before pixel activation. This preliminary preparation of electrical signals allows for simplified wiring since the voltage levels are already established, eliminating the need for complex voltage division networks in the pixel circuits.
Solution Approach 2:
The patent introduces intermediate voltage generation through dedicated voltage generation units that act as intermediaries between the power supply and the pixel circuits. These units provide appropriately scaled voltages to the switching transistors, enabling efficient signal distribution with simplified wiring.
Data Source
AI summary
Disclosed is a digital display system based on a common interface. More particularly, a cluster pixel circuit includes a row terminal connected to a row line for receiving PWM (Pulse Width Modulation) clock signal; a column terminal connected to a column line for receiving N-bit data; a first individual pixel driver for driving a first pixel in the cluster pixel; and a second individual pixel driver connected to the first individual pixel driver and for driving a second pixel in the cluster pixel.