Display Apparatus Aperture Ratio via Blanking Period Control
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Solution Overview
Problem
Existing display apparatuses, such as organic EL and plasma displays, face a decrease in pixel aperture ratio due to the presence of select switches and wiring lines within each pixel, which affects brightness uniformity and manufacturing costs.
Innovation Solution
A data line drive circuit that outputs drive voltages irrelevant to input display data during the blanking period, allowing for simplified control circuits and reduced wiring lines, thereby increasing the pixel aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If select switches and sweep voltage supply lines are formed within each pixel, then gray scale control and brightness uniformity compensation can be achieved, but the pixel aperture ratio decreases
Solution Approach 1:
The invention extracts the sweep voltage supply function from individual pixel circuits and implements it externally through the data line drive circuit. By removing the select switch and sweep voltage supply line from within each pixel, the aperture ratio is increased while the sweep voltage supply function is preserved through external circuitry that operates during the blanking period.
2Reliability
If select switches and precharge voltage supply lines are formed within each pixel, then characteristics variations can be compensated, but the pixel aperture ratio decreases
Solution Approach 1:
The invention extracts the precharge voltage supply function from individual pixel circuits and implements it externally through the data line drive circuit. By removing the select switch and precharge voltage supply line from within each pixel, the aperture ratio is increased while the precharge function is preserved through external circuitry that operates during the blanking period.
3Ease of manufacture
If control circuits and wiring lines are simplified in the display area, then manufacturing cost is reduced and aperture ratio is increased, but control capability during blanking period must be maintained
Solution Approach 1:
The invention moves the control functionality from the spatial dimension (within-pixel circuits) to the temporal dimension (blanking period control). By utilizing the time dimension during the blanking period, the data line drive circuit can perform sweep voltage supply and precharge operations without requiring additional spatial resources within the pixel, thus simplifying the display area while maintaining control capability.
Data Source
AI summary
A display apparatus comprises a self-luminous device display having a plurality of light emitting elements arranged in a matrix, a drive voltage generation circuit to generate a drive voltage signal for driving light emitting elements, a blanking period control-included data line drive circuit which controls the drive voltage either according to or irrelevantly to the display data, a scan line drive circuit to determine which light emitting elements to drive, and a pixel control circuit to control voltage written to pixels.