Display Device with Segmented Pixel Blocks for Crosstalk Reduction
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Solution Overview
Problem
LED display devices with a small number of pixels face challenges in driving multiple pixels simultaneously without increasing current, leading to higher currents and potential optical crosstalk when trying to maintain flicker-free brightness as the number of pixels increases.
Innovation Solution
A display device with a semiconductor layer sequence and a carrier that allows for simultaneous driving of multiple pixels using switches, where the semiconductor layers are identical for all pixels, and a connection layer system that reduces optical crosstalk and enables efficient electrical contacting, including a recess for lateral conductivity and a radiation conversion element for full-color reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels is increased to achieve high resolution, then the image quality is improved, but the current through each pixel must be increased to maintain flicker-free brightness
Solution Approach 1:
The pixel array is divided into multiple blocks, with each block containing multiple pixels that share common row and column contacts. This segmentation allows simultaneous driving of multiple pixels within each block through the shared contacts, enabling high resolution without proportionally increasing the current through each individual pixel contact path
2Measurement precision
If the number of pixels is increased to achieve high resolution, then the image quality is improved, but the switching time increases leading to reduced refresh rate
Solution Approach 1:
The pixel array is segmented into blocks with shared row and column contacts, allowing parallel control of multiple pixels within each block. This reduces the effective switching time per block while maintaining high overall resolution, as the controller can manage multiple blocks simultaneously rather than sequentially processing each individual pixel
Solution Approach 2:
The display operates with periodic refresh cycles where each block of pixels is driven in a coordinated manner through shared row and column contacts. This periodic block-based refreshing maintains high refresh rates even with large numbers of pixels, as the switching operation is distributed across multiple blocks rather than requiring sequential switching of all pixels
3Productivity
If multiple pixels are driven simultaneously to achieve high refresh rate, then the image refresh performance is improved, but optical crosstalk between adjacent pixels increases
Solution Approach 1:
The pixel array is divided into blocks with shared row and column contacts, creating natural optical isolation zones between blocks. This segmentation allows simultaneous driving of multiple pixels within each block while the block structure and contact arrangement minimize optical crosstalk between adjacent pixels and blocks, maintaining high refresh rates without excessive crosstalk
Solution Approach 2:
Each pixel within a block shares common row and column contacts with other pixels in the same block, creating localized electrical and optical zones. This local quality approach ensures that optical crosstalk is contained within or between adjacent blocks rather than affecting the entire display, enabling simultaneous multi-pixel driving with controlled crosstalk levels
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
Enables high-resolution and high-refresh-rate image generation with reduced optical crosstalk and efficient production, allowing for increased pixel count without increasing switching times or current, while maintaining brightness and enabling full-color image reproduction.
Implementation Method 1
An active region (20) which is provided for generating radiation and forms a plurality of pixels (2a, 2b)
Implementation Method 2
The first connection layer (31) and/or the second connection layer (32) or at least one sublayer are preferably reflective for radiation to be generated in the active region when in operation
Data Source
AI summary
A display device with a semiconductor layer sequence includes an active region provided for generating radiation and a plurality of pixels. The display device also includes a carrier. The active region is arranged between a first semiconductor layer and a second semiconductor layer. The semiconductor layer sequence includes a recess, which extends from a major face of the semiconductor layer sequence facing the carrier through the active region into the first semiconductor layer and is provided for electrical contacting of the first semiconductor layer. The carrier includes a number of switches, which are each provided for controlling at least one pixel.