Active Matrix Display Device with Select Driver Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing organic electroluminescent (EL) displays face challenges in achieving high display uniformity due to the sensitivity of polysilicon thin-film transistors (TFTs) to light intensity variations, leading to increased circuit failure rates and higher costs, especially in high-definition panels.
Innovation Solution
A display device architecture with a matrix of pixel circuits, where each pixel includes an optoelectronic element and thin-film transistors, utilizing a data driver and select driver with shift registers and enable control lines to control data and select signals, allowing for digital driving without increasing circuit scale, and sharing data lines between neighboring pixels to reduce the number of circuits and improve uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If polysilicon TFTs are used to drive organic EL elements, then the display can achieve thin and light-weight characteristics, but the TFT characteristics become extremely sensitive to light intensity variations causing poor display uniformity
Solution Approach 1:
The display screen is divided into multiple blocks, with each block containing multiple pixels. The select lines are also divided into multiple groups, where each group corresponds to a specific block. This segmentation allows independent control of different blocks, enabling digital driving within each block while maintaining overall display uniformity across the entire screen.
Solution Approach 2:
Different blocks of pixels are assigned different select line groups with different selection periods. This creates local quality variations where each block can be independently optimized for digital driving, compensating for the sensitivity of polysilicon TFTs to light intensity variations and improving overall display uniformity.
2Manufacturing precision
If multiple driver circuits are added to achieve digital driving, then display uniformity can be improved, but the number of polysilicon TFT circuits increases causing higher circuit failure rates
Solution Approach 1:
The select driver is designed with multi-functionality to control multiple select line groups using a unified digital driving scheme. The driver can sequentially activate different select line groups for different blocks, achieving digital driving across the entire display without requiring separate driver circuits for each block, thereby reducing the total number of circuits while maintaining display uniformity.
Solution Approach 2:
The select lines are activated in a periodic manner where different select line groups are selected in sequence during different time periods within each frame. This periodic activation allows digital driving to be implemented across multiple blocks using a single driver circuit, reducing circuit complexity and failure rates while maintaining display uniformity.
3Measurement precision
If the number of pixels is increased for high-definition display, then resolution is improved, but the number of circuits increases causing yield to fall and costs to increase
Solution Approach 1:
The high-definition display is divided into multiple blocks, with each block containing multiple pixels that share common select line groups. This segmentation reduces the total number of independent select lines required, as pixels within the same block share the same select line control. Consequently, the circuit complexity is reduced while maintaining high resolution, leading to improved manufacturing yield and lower costs.
Solution Approach 2:
Multiple pixels within the same block are merged to share common select line groups and control circuits. This merging reduces the overall number of circuits required for high-definition display, decreasing circuit failure rates and improving manufacturing yield while maintaining high resolution through the increased number of pixels.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables digital driving of organic EL displays with superior uniformity and reduced circuit complexity, maintaining high display quality while minimizing circuit failure rates and costs.
Implementation Method 1
organic EL elements are used in combination with TFTs and utilize this voltage/current control operation so that current is controlled
Implementation Method 2
the operation of applying a voltage to a TFT gate terminal so as to control current between the source and drain
Data Source
AI summary
A display device includes an array having a plurality of pixel circuits arranged in a matrix, each pixel circuit includes a optoelectronic element and a plurality of thin-film transistors for controlling the optoelectronic element; data lines arranged to correspond to columns of pixel circuits for providing data signals to the pixel circuits; a data driver for driving the data lines; select lines for providing select signals for controlling the capture of data signals from the data lines to pixel circuits; and a select driver for driving the select lines including a shift register for sequentially shifting a line select signal, enable circuits for enabling outputs of the shift register, and n (where n is an integer of two or more) enable control lines for controlling the enable circuits, and the enable circuits are connected to the same one of the enable control lines every n lines.