Reflective Electrode TFT for LCD Luminance and Power
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Solution Overview
Problem
Liquid crystal display devices with sensing functions suffer from reduced luminance and increased power consumption due to the light-shielding regions required for sensor driving circuits, which decrease the light-transmission area and increase power usage.
Innovation Solution
Incorporating a sensing driving circuit with both reflective and light-shielding regions, featuring sensing and switching thin film transistors, a sensing storage capacitor, and a reflective electrode to enhance luminance and reduce power consumption by utilizing external or artificial light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sensor driving circuit is formed in each pixel region with a light-shielding region, then sensing function is achieved, but light-transmission area is decreased and luminance is reduced
Solution Approach 1:
The patent divides the sensor driving circuit into two distinct regions: a light-shielding region containing the sensing thin film transistor and sensing storage capacitor, and a light-transmission region containing the second switching thin film transistor. This local differentiation allows the light-shielding region to effectively sense external light while the light-transmission region maintains high luminance by allowing light passage.
2Reliability
If a sensor driving circuit is formed in each pixel region, then sensing function is achieved, but power consumption is increased
Solution Approach 1:
The patent extracts the light-sensitive sensing function from the general switching circuit functionality by dedicating specific components (sensing thin film transistor and sensing storage capacitor) solely to sensing operations. This separation allows the sensing circuit to operate independently with optimized power management, reducing overall power consumption compared to using full switching circuits for sensing.
3Area of stationary object
If the entire pixel region is used for light transmission, then luminance is maximized, but sensing function cannot be implemented
Solution Approach 1:
The patent segments the pixel region into functionally distinct areas: the light-shielding region dedicated to sensing operations and the light-transmission region optimized for display luminance. This segmentation enables both sensing and display functions to operate simultaneously at optimal performance levels without interfering with each other.
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
The solution improves luminance and reduces power consumption by allowing the use of reflective regions for sensing functions, thereby increasing the light-transmission area and optimizing energy efficiency.
Implementation Method 1
A sensing thin film transistor is formed at a predetermined portion of the pixel region for sensing external light
Implementation Method 2
The sensing storage capacitor and the second switching thin film transistor are provided with a reflective region including a reflective electrode
Data Source
AI summary
The disclosure describes a liquid crystal display device with a sensing function and a method of fabricating the same. The device comprising gate and data lines crossing each other on a substrate, so as to define a pixel region including a pixel electrode; a first switching thin film transistor disposed at a crossing of the gate and data lines; a sensing thin film transistor, disposed at a predetermined portion of the pixel region, that senses external light; a sensing storage capacitor that stores a signal sensed by the sensing thin film transistor; and a second switching thin film transistor that receives the sensing signal stored and reads information that is externally inputted, wherein the sensing storage capacitor and the second switching thin film transistor are provided with a reflective region including a reflective electrode.