Stacked Display Layers with Local Drivers for Power Reduction
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Solution Overview
Problem
Display apparatuses for XR applications require high resolution and high drive frequency to enhance realism and immersion, but this increases power consumption and reduces data input per frame.
Innovation Solution
A display apparatus design with a first layer containing a driver circuit region and a second layer with a pixel array, where local driver circuits drive pixel regions, and a control circuit unit manages display regions and non-display regions to optimize signal output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the driving frequency is increased to enhance realism and immersion, then the display quality is improved, but the power consumption increases and the data input time per frame is reduced
Solution Approach 1:
The pixel array is divided into multiple pixel regions, each driven by a dedicated local driver circuit. This segmentation allows independent control of different display regions, enabling the system to activate only the necessary regions at high frequency while keeping others in low-power mode, thus resolving the contradiction between high driving frequency and power consumption.
Solution Approach 2:
The display apparatus dynamically adjusts the driving frequency and activation state of different pixel regions based on the input image content and aspect ratio. The control circuit unit determines which regions require high-frequency driving and which can be deactivated, creating a dynamic balance between display quality and power consumption.
2Speed
If the driving frequency is increased to enhance realism and immersion, then the display quality is improved, but the data input time per frame is reduced
Solution Approach 1:
By segmenting the pixel array into multiple regions with dedicated local driver circuits, the system can process and input data for each region independently and in parallel. This reduces the total data input time per frame compared to sequential processing of the entire pixel array, enabling high driving frequency operation.
Solution Approach 2:
The local driver circuits are pre-configured and ready to receive data signals, with control logic that determines region activation based on aspect ratio and input image dimensions. This preliminary preparation allows immediate high-frequency operation without waiting for complete frame data processing.
3Use of energy by moving object
If local driver circuits are used to drive pixel regions, then the power consumption is reduced, but the device complexity increases
Solution Approach 1:
The driver circuit is segmented into multiple local driver circuits, each responsible for a specific pixel region. This modular segmentation reduces power consumption by activating only necessary regions, and the repetitive modular structure simplifies design and manufacturing compared to a single complex centralized driver circuit.
Solution Approach 2:
The patent transitions from a planar integration approach to a three-dimensional stacked architecture, with driver circuits positioned on a different layer than the pixel array. This vertical separation reduces routing complexity and allows independent optimization of each layer, managing device complexity while enabling local driver circuit functionality.
4Area of stationary object
If the driver circuit region is positioned inside the pixel array, then the area utilization is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The driver circuit region is positioned on a different layer (first layer) than the pixel array (second layer), creating a three-dimensional stacked configuration. This vertical separation allows the driver circuits to be integrated within the display area without compromising pixel manufacturing precision, as each layer can be independently fabricated and then bonded together.
Data Source
AI summary
A display apparatus with a novel structure is provided. The display apparatus includes a first layer and a second layer positioned above the first layer. The first layer includes a driver circuit region, and the second layer includes a pixel array. The pixel array includes a plurality of pixel regions. The driver circuit region includes a control circuit unit and a plurality of local driver circuits. One of the plurality of local driver circuits corresponds to any one of the plurality of pixel regions. The local driver circuit has a function of outputting a driving signal for driving a plurality of pixels included in the corresponding pixel region. The control circuit unit has a function of comparing definition data of an input image signal and aspect ratio data of the pixel array to determine a first region where display is performed and a second region where display is not performed, and outputting, to the local driver circuit corresponding to the second region, a control signal for stopping output of the driving signal.