Pixel Unit Light Sensing Circuit for HDR Display Contrast
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Solution Overview
Problem
HDR display devices face issues with short service life and increased cost due to the need for multiple backlight sources to alleviate dark-state light leakage, and struggle with achieving ultra-thin designs and effective contrast control.
Innovation Solution
A pixel unit and driving method that includes a control circuit, light sensing circuit, and storage capacitor, which adjusts the voltage at the pixel electrode based on light signals to control liquid crystal transmittance, eliminating the need for multiple backlight sources by dynamically adjusting transmittance in each partition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple backlight sources are used to alleviate dark-state light leakage, then display contrast is improved, but device complexity and cost increase
Solution Approach 1:
The display panel is divided into multiple independent partitions, each with its own pixel units that can independently control light transmittance. This segmentation allows different regions to have different transmittance states, enabling high contrast without requiring multiple backlight sources. The pixel units in different partitions can be independently controlled to create local dimming effects.
Solution Approach 2:
The pixel units incorporate light sensing circuits that dynamically sense ambient light conditions and automatically adjust the transmittance state of each partition. This dynamic adaptation allows the display to maintain optimal contrast ratios under varying lighting conditions without requiring manual intervention or multiple fixed backlight sources.
2Illumination intensity
If multiple backlight sources are used to achieve HDR effect, then image quality is improved, but service life of backlight sources decreases
Solution Approach 1:
The pixel units are equipped with light sensing circuits that enable them to autonomously detect ambient light conditions and self-adjust their transmittance states. This self-service capability allows each partition to adapt to lighting changes without requiring additional backlight sources, thereby extending the service life of existing backlight components while maintaining HDR image quality.
3Illumination intensity
If quantity of backlight sources is increased to achieve HDR partitions, then display performance is improved, but manufacturing cost increases
Solution Approach 1:
The pixel units serve multiple functions: they act as both display elements and light sensing elements. The same pixel unit structure is used across all partitions, with each unit capable of independent transmittance control. This multi-functionality eliminates the need for additional specialized components in each partition, reducing manufacturing complexity and cost while achieving HDR performance.
4Illumination intensity
If dark-state light leakage is reduced, then black image quality is improved, but more backlight sources are required
Solution Approach 1:
Each partition's pixel units can independently adjust their transmittance to create local dark states with minimal light leakage. By controlling individual partitions rather than requiring global backlight control, the system achieves superior black image quality in specific regions without needing to increase the overall number of backlight sources.
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 solution enhances display contrast and prolongs backlight source life by allowing independent control of each partition's transmittance, reducing the need for multiple backlight sources and lowering costs while maintaining high dynamic range and ultra-thin design capabilities.
Implementation Method 1
the light sensing circuit is further configured to convert a light signal received by the light sensing circuit into an electrical signal
Data Source
AI summary
A pixel unit and a driving method thereof, a liquid crystal panel and a display device are provided. The pixel unit includes a pixel electrode, a control circuit, a light sensing circuit, a data line and a gate line. A control end of the control circuit is connected to the gate line, a first end of the control circuit is connected to the date line, a second end of the control circuit is connected to a first end of the light sensing circuit, and a second end of the light sensing circuit is connected to the pixel electrode. The control circuit is configured to control, under control of the gate line, the data line to be connected to the first end of the light sensing circuit.