Display Driving Circuit Segmentation for Pixel Uniformity
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Solution Overview
Problem
Existing display devices using light-emitting elements, such as organic electroluminescent elements, face challenges in maintaining image quality due to variations in driving transistor characteristics, which affect grayscale control and image uniformity.
Innovation Solution
A driving circuit with a matrix arrangement of pixel circuits, utilizing multiple data lines and gate lines, along with light-emitting control lines, to independently control the light-emitting current of each pixel circuit, including write control, driving, light-emitting control, and reset transistors, and capacitive elements to manage voltage and current supply efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple data lines are provided for each column to enable independent writing of pixel circuits, then writing time is extended and writing precision is improved, but device complexity increases
Solution Approach 1:
The pixel circuits are divided into multiple groups based on row numbers, with each group exclusively connected to a specific data line. This segmentation allows independent writing operations for different pixel groups simultaneously, extending writing time and improving writing precision without requiring all pixel circuits to share a single data line, thus managing device complexity through structured organization
2Manufacturing precision
If pixel circuits are independently controlled with separate write control and light-emitting control, then image quality is improved and uniformity is enhanced, but device complexity increases
Solution Approach 1:
The control function is segmented into distinct write control transistors for data voltage writing and light-emitting control transistors for current supply control. This segmentation enables independent operation of writing and light-emitting control, improving image quality and uniformity by allowing precise control of each pixel circuit's writing and emission processes separately
Solution Approach 2:
The reset transistor performs preliminary action by setting the gate electrode to initial voltage before the write operation. This preliminary reset ensures that the pixel circuit is in a known initial state, preparing it for accurate subsequent writing and light-emitting control operations, thereby improving overall control precision
3Productivity
If n data lines are disposed for each column to enable parallel writing, then productivity is improved, but device complexity increases
Solution Approach 1:
Pixel circuits are segmented into n groups corresponding to n data lines, allowing parallel writing operations across multiple groups simultaneously. This segmentation enables concurrent writing of different pixel circuits through different data lines, improving productivity by reducing total writing time, while the systematic grouping approach manages the complexity of multiple data lines
Solution Approach 2:
The patent introduces a row-grouping dimension to organize pixel circuits, where pixel circuits are assigned to specific groups based on their row numbers. This dimensional organization allows efficient mapping of multiple data lines to specific pixel groups, enabling parallel writing operations and improving productivity while managing system complexity through structured dimensionality
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 solution enables precise control of light-emitting elements, improving image quality by allowing independent writing and light emission of pixel circuits, reducing image unevenness and extending writing time, thus enhancing display quality and definition.
Implementation Method 1
a capacitive element disposed between a corresponding data line and the gate electrode of the driving transistor and to retain a voltage corresponding to a write data voltage
Data Source
AI summary
A device includes pixel circuits arranged in columns and rows, n data lines (n being an integer of 2 or more) for each column, gate lines supplied with scan signals, and light-emitting control lines supplied with light-emitting control signals. The pixel circuits are divided into n groups of rows, each group of rows being exclusively connected to a corresponding data line. Each pixel circuit includes a write control transistor to control writing a data voltage in response to a scan signal, a driving transistor to control the amount of current to be supplied to a current light-emitting element, a light-emitting control transistor to control supply of a current to the light-emitting element in response to a light-emitting control signal, a capacitor to retain a voltage corresponding to a write data voltage, and a reset transistor to set the gate electrode of the driving transistor with the initial voltage.