Touch Display Common Electrode Voltage Uniformity
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Solution Overview
Problem
Touch display devices with non-ideal shaped substrates experience display abnormalities such as nonuniform brightness due to varying common electrode block shapes and areas, leading to inconsistent common voltage distribution.
Innovation Solution
A touch display device with a plurality of common electrode blocks of identical shape and area, and at least one block with a different shape or area, connected through switch circuits that can disconnect or connect them to a common voltage output terminal, ensuring uniform voltage distribution across all blocks during display and touch stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If common electrode blocks have different shapes and areas to adapt to non-ideal substrate shapes, then the substrate can accommodate non-ideal shapes, but the common voltage distribution becomes inconsistent causing nonuniform brightness
Solution Approach 1:
The patent applies local quality by introducing switch circuits at specific locations (connected to common voltage output terminals) to locally adjust the voltage distribution to the common electrode blocks. This allows different regions of the display to receive appropriately adjusted voltages, compensating for the varying areas and shapes of individual common electrode blocks, thereby achieving uniform brightness across the entire display area.
Solution Approach 2:
The patent changes the voltage parameter dynamically by using switch circuits that can adjust the common voltage applied to different common electrode blocks. By controlling the switch circuits, the system can modify the voltage distribution parameters in real-time, ensuring that each common electrode block receives an appropriate voltage level that results in uniform brightness despite differences in block geometry.
2Illumination intensity
If switch circuits are introduced to control common voltage distribution, then brightness uniformity is improved, but device complexity increases
Solution Approach 1:
The patent segments the common voltage control system into multiple independent switch circuits, each associated with specific common electrode blocks. This segmentation allows for localized control of voltage distribution, enabling precise adjustment of brightness uniformity while keeping each individual switch circuit relatively simple. The modular nature of segmented control reduces overall system complexity compared to a monolithic control approach.
Data Source
AI summary
There is provided a touch display device, which includes a touch display substrate, a drive circuit and at least one switch circuit. The touch display substrate includes plural common electrode blocks including plural first-shaped common electrode blocks and at least one second-shaped common electrode block. The drive circuit includes plural touch terminals and at least one common voltage output terminal, and each common electrode block is connected to one of the touch terminals through a touch line. Each switch circuit is connected to at least one of the at least one second-shaped common electrode block and a portion of the first-shaped common electrode blocks, and configured to cause the common electrode blocks connected to the switch circuit to be disconnected from (or connected to) each other and disconnected from (or connected to) a respective common voltage output terminal connected to the switch circuit.