Display Apparatus With Segmented Selection Circuits For Signal Timing
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Solution Overview
Problem
In display apparatus using organic electroluminescence, ensuring timely transition of image signals to signal lines with large voltage differences can be challenging, leading to incorrect image signal supply and reduced frame rates.
Innovation Solution
The display apparatus is arranged with multiple selection circuits and display blocks, where each block corresponds to one selection circuit, allowing signal lines to be selected and supplied in a predetermined order to minimize voltage differences between adjacent pixels, thereby optimizing signal transition times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If signals are supplied to all signal lines from a driving circuit, then all pixels can be driven, but the number of outputs of driving circuit and output circuits increases
Solution Approach 1:
The patent divides the display panel into multiple display blocks (first display block, second display block, etc.), each corresponding to one selection circuit. This segmentation allows the driving circuit to control fewer signal lines per selection circuit while still covering the entire display area through multiple selection circuits working in parallel.
Solution Approach 2:
The patent introduces a block dimension by organizing signal lines into multiple display blocks that can be independently selected. Instead of a single linear array of signal lines, the system adds a block-level hierarchy, allowing systematic reduction of outputs per circuit while maintaining full coverage.
2Device complexity
If image signal is supplied while switching the signal line by the selection circuit, then the number of outputs is reduced, but the time until the image signal transitions to a desired signal voltage cannot be ensured when voltage difference is large
Solution Approach 1:
The patent applies different selection times to different signal lines based on their specific characteristics. Signal lines with large voltage differences are assigned longer selection times, while those with small voltage differences use shorter selection times. This localized optimization ensures reliable signal transition for each line without uniformly increasing the time for all lines.
Solution Approach 2:
The patent implements dynamic selection timing where the selection time for each signal line is adjusted according to the voltage difference characteristics of that specific line. This dynamic approach allows the system to adapt to varying signal requirements rather than using a fixed uniform timing scheme.
3Reliability
If the setup time to supply the image signal to the signal line is prolonged, then the image signal can be reliably supplied, but the frame rate of displaying an image on the display apparatus lowers
Solution Approach 1:
The patent applies different selection times to different signal lines based on their specific voltage difference characteristics. Only signal lines that require longer setup times for reliable transition are assigned extended durations, while other lines use shorter optimized times. This prevents the entire frame rate from being constrained by the slowest lines.
Solution Approach 2:
The patent changes the selection time parameter dynamically for different signal lines based on their voltage difference characteristics. By adjusting this temporal parameter locally rather than uniformly, the system achieves reliable signal supply where needed while maintaining high frame rates overall.
4Loss of time
If the number of selection circuits and display blocks is increased, then signal transition time can be optimized, but the device complexity increases
Solution Approach 1:
The patent segments the display into multiple display blocks with dedicated selection circuits, allowing parallel processing of signal lines. This segmentation reduces the time each selection circuit needs to switch between signal lines while distributing the complexity across multiple independent circuits rather than one complex circuit.
Data Source
AI summary
A display apparatus in which selection circuits and display blocks are arranged is provided. Each of the display blocks include signal lines extending in a column direction, and pixels connected to the signal lines and arranged in a matrix in the column direction and in a row direction crossing the column direction. Each of the selection circuits selects a signal line in a predetermined order to supply an image signal among the signal lines such that the image signal is written in each of the pixels arranged in the row direction among the pixels. A time to select at least one signal line among the signal lines and supply the image signal is different from a time to select a signal line other than the at least one signal line among the signal lines and supply the image signal.