Light Emitting Pixel Array Routing for Uniform Characteristics
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Solution Overview
Problem
Existing light emitting apparatuses using OLEDs exhibit characteristic differences between the upper and lower halves of the pixel array portion due to signals being supplied from different driving circuits, leading to uneven performance.
Innovation Solution
The apparatus is configured with signal lines divided into sub-signal lines, using a common reference voltage generation circuit to supply signals to pixels of the same column via corresponding sub-signal lines, and employing a signal line switching circuit to switch connections between these sub-signal lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If signals are supplied from different driving circuits to the signal lines of the upper half and lower half of pixels in the same column, then the write time is shortened, but a characteristic difference is generated between the upper half and lower half of the pixel array portion
Solution Approach 1:
The signal lines are divided into multiple sub-signal lines (first sub-signal lines and second sub-signal lines) that extend in the column direction. This segmentation allows signals to be distributed through separate pathways while maintaining consistent electrical characteristics within each column, thereby reducing characteristic differences between upper and lower half pixels while enabling parallel signal writing.
Solution Approach 2:
The reference voltage generation circuit serves as a common source for generating signals that are supplied to pixels in both the upper half and lower half through different sub-signal lines. This universal reference voltage source ensures that pixels in the same column receive signals with consistent electrical characteristics, eliminating characteristic differences while maintaining the ability to write to multiple regions simultaneously.
2Productivity
If signals are supplied from different driving circuits to different regions, then the writing speed is improved, but the characteristic difference between regions increases
Solution Approach 1:
The patent implements local quality by ensuring that pixels within the same column (local region) receive signals with identical electrical characteristics from the same reference voltage generation circuit through corresponding sub-signal lines. This local consistency maintains characteristic uniformity while the overall system achieves high writing speed through parallel signal distribution to multiple columns and regions.
Data Source
AI summary
A light emitting apparatus includes a pixel array portion including a plurality of pixels, and a plurality of signal lines extending in a column direction. Each of the signal lines is divided into a plurality of sub-signal lines, the apparatus is configured such that, to the pixels of the same column, a signal generated using an output signal from the same reference voltage generation circuit is supplied via a corresponding sub-signal line, the apparatus includes first and second substrates, which are stacked on each other, the first substrate includes the pixel array portion, and the second substrate includes a signal output circuit configured to output the signal, and a signal line switching circuit configured to switch a connection destination of an output of the signal output circuit between the sub-signal lines.