Electro-optical Device Data Transfer Line Segmentation
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Solution Overview
Problem
In electro-optical devices using transistors to adjust light emission intensity, variations in transistor threshold voltages lead to decreased image quality, and the compensation period for these variations is lengthened by the time required for charging or discharging parasitic capacitors, often resulting in insufficient compensation if not properly accounted for.
Innovation Solution
The electro-optical device incorporates a configuration with a scan line, data transfer lines, capacitors, and transistors that reduce the compensation period by shortening the data transfer lines and using a drive circuit to manage potential changes, allowing for efficient charging and discharging of parasitic capacitors, thereby reducing the time needed for compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the data transfer line is lengthened to cover more pixel circuits, then the number of pixels served increases, but the parasitic capacitor increases and the compensation period is lengthened
Solution Approach 1:
The data transfer line is divided into multiple segments, each serving a subset of pixel circuits. By segmenting the originally long data transfer line into shorter segments, the parasitic capacitance of each segment is reduced, allowing faster charging/discharging and thus shorter compensation periods while still covering all pixel circuits through multiple segments working in parallel or sequence
2Productivity
If the compensation period is shortened to improve speed, then productivity increases, but insufficient compensation occurs leading to degraded image quality
Solution Approach 1:
The compensation voltage level is dynamically adjusted based on the actual threshold voltage variation of the transistor. By changing the compensation voltage parameter to match the actual deviation, adequate compensation is achieved within the shortened compensation period, ensuring both speed and image quality are maintained
Data Source
AI summary
An electro-optical device includes a first data transfer line that intersects a scan line, a second data transfer line, a first transistor that controls coupling between the first data transfer line and the second transfer line. The two or more second data transfer lines are respectively coupled to the first data transfer line via first capacitors, and when a collection of pixel circuits that are coupled to the same first data transfer line via the second data transfer lines is referred to as a pixel string, the second data transfer lines are provided to pixel circuits less than the pixel circuits included in the pixel string.