Liquid Crystal Display Light Control Panel for Transistor Stability
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Solution Overview
Problem
Thin film transistors in monolithic peripheral circuits of liquid crystal display devices experience characteristic changes and degradation over time, leading to abnormal device behavior, as they cannot effectively control light radiation to specific regions and suffer from wavelength-dependent transmittance issues.
Innovation Solution
A liquid crystal display device is designed with a light control panel between the display panel and the backlight, featuring a pattern image display region that controls light radiation to the peripheral circuit region, allowing for selective light emission to specific transistors based on their action state, thereby improving transistor capability and suppressing characteristic changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light is radiated to a thin film transistor to improve on-current, then the transistor capability is improved, but the transistor characteristics change due to aging and threshold shift
Solution Approach 1:
The patent applies periodic action by alternately radiating light to different transistors in the peripheral circuit. Transistors are cycled through light exposure and dark periods, allowing some transistors to be in 'rest' state while others receive light stimulation. This periodic illumination prevents continuous degradation of any single transistor and maintains overall circuit reliability over time.
Solution Approach 2:
The patent implements preliminary action by pre-radiating light to specific transistors before they are needed for critical operations. This preliminary light exposure activates transistors in advance, ensuring they are in optimal state when required, while avoiding continuous exposure that would cause degradation. The system proactively manages transistor states to prevent characteristic changes.
2Reliability
If a variable coloration layer is provided to optimize on-current and off-current, then transistor control is improved, but wavelength-dependent transmittance prevents controlled light radiation for all wavelengths
Solution Approach 1:
The patent applies local quality by providing different light control characteristics to different regions of the display panel. The light control panel is configured to selectively radiate light to specific local regions corresponding to peripheral circuit transistors, rather than uniformly across the entire panel. This localized control allows precise management of light exposure to individual transistors, optimizing their performance without affecting other regions.
Solution Approach 2:
The patent segments the light control function by dividing the display panel into an image display region and a peripheral circuit region with distinct light control characteristics. The light control panel is configured to selectively radiate light to the peripheral circuit region based on the operation state of transistors in that region, separating the light control function from the image display function and enabling precise transistor-level control.
3Device complexity
If the peripheral circuit is formed monolithically on the substrate, then device complexity is reduced and costs are lowered, but transistor aging and characteristic changes occur over time
Solution Approach 1:
The patent applies self-service by enabling the light control panel to automatically adjust light radiation based on the operation state of peripheral circuit transistors. The system monitors transistor states and autonomously controls light exposure to optimize performance and prevent degradation, without requiring external intervention or complex additional control circuits. This self-regulating mechanism maintains reliability while preserving the simplicity of the monolithic integration.
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 enhances the current drive capability of transistors in the monolithic peripheral circuit, preventing abnormal actions and maintaining stable performance by selectively radiating light to transistors during charging and discharging, thus improving the overall performance and longevity of the liquid crystal display device.
Implementation Method 1
a light control panel including a pattern image display region is provided between the display panel and the backlight, the pattern image display region being a region including a first region corresponding to the actual image display region and a second region corresponding to the peripheral circuit region and a region on which a pattern image configured to control radiation of light emitted from the backlight to the display panel is displayed
Data Source
AI summary
A light control panel including an image display region including a region corresponding to an image display region in a display panel and a region corresponding to a peripheral circuit region in the display panel is provided between the display panel and a backlight. A pattern image for controlling radiation of light emitted from the backlight to the display panel is displayed in the image display region in the light control panel according to an action state of the peripheral circuit in the display panel.