Display Substrate Initialization Signal Lines for Uniformity
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Solution Overview
Problem
Current OLED and QLED technologies face challenges in achieving uniform brightness and high image quality, particularly in maintaining low brightness in a black state and reducing impedance of initialization signal lines.
Innovation Solution
The display substrate incorporates a base substrate with a pixel driving circuit and light-emitting device arrangement, featuring distinct initialization signal lines that transmit different signals to control electrodes and light-emitting devices, and a mesh distribution of third initialization signal lines to reduce impedance and enhance picture quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single initialization signal line is used to reset both the driving transistor gate and the light-emitting device first electrode, then the circuit complexity is reduced, but the display uniformity and black state brightness control deteriorate
Solution Approach 1:
The patent divides the initialization function into two separate signal lines: the first initialization signal line (INIT1) dedicated to resetting the driving transistor gate, and the second initialization signal line (INIT2) dedicated to resetting the light-emitting device first electrode. This segmentation allows independent optimization of each initialization path, enabling precise control over display uniformity and black state brightness without compromising circuit simplicity excessively.
Solution Approach 2:
Different initialization signals are applied to different parts of the pixel circuit based on their specific requirements. The first initialization signal (Vinit1) is optimized for the driving transistor gate characteristics, while the second initialization signal (Vinit2) is optimized for the light-emitting device first electrode characteristics. This local quality approach ensures that each component receives the most appropriate initialization voltage for its specific function.
2Productivity
If the width of initialization signal lines is reduced to increase pixel density, then the pixel resolution is improved, but the impedance of the signal lines increases
Solution Approach 1:
The patent optimizes the width parameters of the first and second initialization signal lines based on their specific functional requirements and positions within the pixel circuit. By carefully adjusting the width parameters, the design achieves an optimal balance between maintaining low impedance for reliable signal transmission and maximizing pixel density for high-resolution displays.
Data Source
AI summary
A display substrate and a display apparatus are provided. The display substrate includes a plurality of sub-pixels, and pixel driving circuits of sub-pixels form M pixel rows and N pixel columns; the display substrate includes a first initialization signal line and a second initialization signal line; the pixel driving circuits include a plurality of transistors and a light-emitting device, and the transistors include driving transistors; the light-emitting device includes a first electrode, wherein the first initialization signal line is respectively electrically connected with the mth row of sub-pixels, and is configured to transmit a first initialization signal to a control electrode of a driving transistor of the mth row of sub-pixels; the second initialization signal line is respectively electrically connected with the (m−1)th row of sub-pixels, and is configured to transmit a second initialization signal to a first electrode of a light-emitting device of the (m−1)th row of sub-pixels.