Display Apparatus Drive Scanner Output Buffer Merging
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Solution Overview
Problem
Existing active matrix display apparatus with organic EL devices face challenges in reducing the size of the peripheral driving section, leading to increased circuit area and cost, due to the need for multiple output stages and large output buffers for power supply lines.
Innovation Solution
The display apparatus uses a drive scanner to commonize the output buffer for power supply lines, dividing feed lines into groups and synchronizing their potential changeovers, allowing common control timings and reducing the number of output buffers, thereby minimizing circuit size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple output stages and large output buffers are used for power supply lines, then the power supply stability is improved, but the circuit area and cost increase
Solution Approach 1:
The patent merges multiple output buffers into a single shared output buffer that serves multiple feed lines. The drive scanner uses one common output buffer to control the potential changeovers of multiple feed lines grouped together, eliminating the need for separate output buffers for each feed line. This combining approach maintains power supply stability while significantly reducing the circuit area occupied by the output buffers.
Solution Approach 2:
The single output buffer in the drive scanner is designed to perform multiple functions by serving multiple feed lines. This universal output buffer can control the potential changeovers for different groups of feed lines through time-division multiplexing, where the same buffer resource is allocated to different feed line groups at different time periods, achieving multi-functionality with a single component.
2Ease of manufacture
If the number of output buffers is reduced, then the circuit cost is reduced, but the control complexity increases
Solution Approach 1:
The patent segments the feed lines into multiple groups, where each group is controlled by the same output buffer at different time periods. This segmentation allows the single output buffer to manage multiple feed lines through time-division multiplexing, reducing the total number of output buffers needed while maintaining proper control of each feed line group through dedicated time slots.
Solution Approach 2:
The drive scanner employs periodic action by sequentially allocating the single output buffer to different feed line groups in a repeating cycle. Each feed line group receives control signals from the output buffer during its designated time period, and this periodic time-division multiplexing approach reduces hardware complexity while maintaining control functionality through structured temporal allocation.
3Device complexity
If feed lines are grouped and controlled at common timings, then the number of output buffers is reduced, but the image uniformity may be affected
Solution Approach 1:
The patent applies preliminary action by pre-planning and pre-allocating specific time periods for each feed line group to access the shared output buffer. This time-division multiplexing schedule is established in advance, ensuring that each feed line group receives its control signals at predetermined timings that maintain proper synchronization and prevent interference, thereby preserving image uniformity while reducing buffer count.
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 approach reduces the circuit size and cost of the peripheral driving section while maintaining image uniformity and luminance stability by correcting threshold voltage and mobility variations in the driving transistors, allowing for a more compact and cost-effective display panel.
Implementation Method 1
The organic EL device utilizes a phenomenon that, if an electric field is applied to an organic thin film, then the organic thin film emits light.
Data Source
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AI summary
Disclosed herein is a display apparatus, including a pixel array section; and a driving section; the pixel array section including a plurality of scanning lines (WS) extending along the direction of a row, a plurality of signal lines (SL) extending along the direction of a column, a plurality of pixels disposed in rows and columns at places at which the scanning lines and the signal lines intersect with each other, and a plurality of feed lines (DS) disposed in parallel to the scanning lines, the driving section including a signal selector (3) for supplying a driving signal having a signal potential to the signal lines, a write scanner (4) for successively supplying a control signal to the scanning lines, and a drive scanner (5) for supplying a power supply, which changes over between a high potential and a low potential, to the feed lines.