Chiplet Display Serial Control via Store-and-Forward
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Solution Overview
Problem
Existing display devices face limitations in control and wiring, leading to flicker issues, high costs, and reduced aperture ratios due to passive-matrix and active-matrix control methods, which are unsuitable for large displays and require extensive external driver circuits.
Innovation Solution
A display device with a substrate featuring an array of pixels connected through a first serial bus with store-and-forward circuits and driver circuits, allowing for simpler control and improved aperture ratios by using chiplets distributed over the substrate in a serial connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If passive-matrix control method is used, then device complexity is reduced, but flicker increases and the number of controllable rows is limited to about 100 lines
Solution Approach 1:
The display device is divided into multiple independently controllable chiplets, each managing a portion of the pixel array. This segmentation allows active-matrix control to be implemented in distributed units rather than requiring a single complex control circuit, thereby reducing overall device complexity while maintaining reliable flicker-free performance across the entire display.
Solution Approach 2:
Each chiplet incorporates its own active-matrix control circuitry and store-and-forward memory, enabling it to independently control its associated pixels without requiring continuous external driver chip intervention. This self-service capability eliminates flicker by maintaining persistent pixel states while reducing the burden on external control circuits.
2Reliability
If active-matrix control method is used, then flicker is eliminated and control precision is improved, but device complexity increases and external driver circuits are required
Solution Approach 1:
The active-matrix control functionality is segmented and distributed across multiple chiplets rather than centralized in external driver circuits. Each chiplet contains its own control logic and store-and-forward memory, eliminating the need for complex external driver circuits while maintaining flicker-free performance through localized active control.
Solution Approach 2:
The control architecture transitions from a two-dimensional matrix structure requiring external row and column drivers to a distributed one-dimensional serial bus structure. Data is shifted serially through store-and-forward circuits within each chiplet, reducing the complexity of external driver circuits while maintaining precise pixel control.
3Ease of operation
If external row and column driver chips are used, then pixel control is achieved, but cost increases and aperture ratio is reduced
Solution Approach 1:
The control functionality previously separated into external driver chips is merged into the display substrate itself through distributed chiplets. Each chiplet integrates control logic, store-and-forward memory, and pixel driving circuitry, eliminating the need for separate external driver circuits and reducing overall device complexity.
Solution Approach 2:
The control architecture transitions from requiring external two-dimensional matrix driver circuits to using distributed one-dimensional serial bus connections with store-and-forward shifting. This dimensional change eliminates the need for complex external row and column drivers while maintaining full pixel control capability.
4Area of stationary object
If serial connection with store-and-forward circuits is used, then aperture ratio is improved and external driver circuits are reduced, but data transmission complexity increases
Solution Approach 1:
The display is segmented into multiple chiplets connected via serial bus, with each chiplet containing store-and-forward circuits. This segmentation reduces the aperture ratio loss associated with extensive external driver circuit wiring while the systematic serial shifting mechanism manages data transmission complexity through structured, incremental data propagation.
Solution Approach 2:
Data is preliminarily shifted into store-and-forward circuits within each chiplet before being used to control pixels. This preliminary action allows data to be prepared and staged in advance through the serial bus, reducing the need for complex simultaneous multi-channel data transmission while maintaining efficient pixel control.
Data Source
AI summary
A display device, including a substrate; an array of pixels arranged in rows and columns forming a light-emitting area over the substrate, each pixel including a first electrode, one or more layers of light-emitting material located over the first electrode, and a second electrode located over the one or more layers of light-emitting material; a first serial buss having a plurality of electrical conductors, each electrical conductor connecting one chiplet in a first set of chiplets to only one other chiplet in the first set in a serial connection, the chiplets being distributed over the substrate in the light-emitting area, each chiplet including one or more store-and-forward circuits for storing and transferring data connected to its corresponding electrical conductor; and a driver circuit in each chiplet for driving at least one pixel in response to data stored in the store-and-forward circuit.