Display Panel Demultiplexer for Low-Power Sensing
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Solution Overview
Problem
Existing display devices face challenges in achieving reduced power consumption and improved display quality and sensing reliability, particularly in organic light-emitting display devices.
Innovation Solution
The display device incorporates a light-blocking part surrounding emission layers, a demultiplexer circuit with switches, and a data-driving circuit to provide different voltage levels to data lines, allowing for controlled light emission and black signal provision, enabling operation in multiple modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light-blocking part is added to control light emission, then display quality and sensing reliability are improved, but device complexity increases
Solution Approach 1:
The light-blocking part is divided into multiple segments corresponding to different data lines, allowing selective light blocking for specific pixels while maintaining transparency for others. This segmentation enables precise control of light emission without requiring a complete light-blocking structure across the entire display, thus improving sensing reliability while limiting complexity increase.
Solution Approach 2:
The light-blocking part is positioned only in specific regions where light control is needed for sensing operations, rather than uniformly across the entire display. This local application allows the display to maintain its light-emitting functionality in non-sensing areas while providing controlled light blocking in sensing areas, improving reliability without unnecessarily increasing overall device complexity.
2Use of energy by moving object
If multiple voltage levels are provided to data lines through a demultiplexer circuit, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The demultiplexer circuit enables a single data line to serve multiple functions by accepting different voltage levels for different purposes: standard voltage levels for normal display operation and specialized voltage levels (such as black signal levels) for sensing operations. This multi-functionality allows power consumption reduction during sensing without requiring separate dedicated circuits for each function, thus limiting the increase in device complexity.
Solution Approach 2:
The demultiplexer circuit dynamically switches between different voltage signal modes based on operational requirements, transitioning between standard display data signals and specialized sensing signals (such as black signals for sensing). This dynamic adaptability allows the system to optimize power consumption during sensing operations while maintaining normal display functionality, avoiding the need for static separate circuits.
3Illumination intensity
If black signals are provided to specific pixels, then display quality during sensing is improved, but device complexity increases
Solution Approach 1:
Black signals are provided only to specific pixels that are designated for sensing operations, rather than to the entire display. This localized application ensures that pixels requiring sensing have appropriate light-blocking characteristics (achieved through black signals) while other pixels maintain normal display functionality, improving display quality during sensing without unnecessarily increasing device complexity.
Solution Approach 2:
The display pixels are segmented into different functional groups: pixels receiving black signals for sensing operations and pixels receiving normal display signals. This segmentation allows precise control of illumination intensity in sensing regions while maintaining display quality in non-sensing regions, improving overall display quality during sensing without requiring complex system-wide modifications.
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 configuration reduces power consumption and enhances display quality and sensing reliability by optimizing light control and voltage levels, thereby improving overall performance.
Implementation Method 1
a light control layer above the display panel, including a light-blocking part, and configured to control light emitted from the one or more pixels
Implementation Method 2
The organic light-emitting display device may include a light-emitting element, and the light-emitting element may generate light through re-combination of electrons and holes
Data Source
AI summary
A display device includes a display panel including first and second data lines and one or more pixels including a first pixel and a second pixel, a light control layer above the display panel, including a light-blocking part, and configured to control light emitted from the one or more pixels, a demultiplexer circuit electrically connected to the display panel, and including a first switch connected to the first data line, and a second switch connected to the second data line, and a data-driving circuit connected to the demultiplexer circuit, and configured to provide a data signal including a first data signal including a first voltage level to the first data line based on activation of the first switch, and a second data signal including a second voltage level that is different from the first voltage level to the second data line based on activation of the second switch.