Display Device Photovoltaic Current Discharge Circuit
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Solution Overview
Problem
Liquid Crystal Display (LCD) devices experience flicker due to residual electrical fields caused by the photovoltaic effect, which is not effectively mitigated by traditional shading methods, especially after the adoption of cover lenses with opaque areas on capacitance touch screens.
Innovation Solution
Incorporating a display panel with a first and second display test signal inputting part, connected via a short-circuit or depletion MOS transistor, to direct photovoltaic current to a grounding terminal, reducing the influence of residual direct current on display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an opaque area is designed on the cover lens to shield light, then the photovoltaic effect is reduced, but the shielding effect is insufficient and the photovoltaic effect still exists
Solution Approach 1:
The patent extracts the harmful photovoltaic current from the data line by providing a separate discharge path through the test signal inputting part and MOS transistor to the grounding terminal, separating the harmful current path from the normal signal transmission path
Solution Approach 2:
The patent introduces a MOS transistor as an intermediary component that controls the discharge of photovoltaic current, allowing it to be safely directed to ground without affecting the normal operation of the data line or requiring complete light blocking
2Object-affected harmful factors
If a shading tape is used to prevent the photovoltaic effect, then the photovoltaic effect is eliminated, but the device structure becomes more complex and manufacturing becomes more difficult
Solution Approach 1:
The patent merges the photovoltaic current discharge function with the existing test signal inputting structure, utilizing the available test signal inputting part and grounding terminal rather than adding completely separate shielding components
Solution Approach 2:
The patent replaces the mechanical shading tape solution with an electrical circuit solution using MOS transistors and test signal inputting parts, substituting a physical blocking mechanism with an electronic current control mechanism
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 effectively reduces the impact of photovoltaic-induced residual direct current on the display, thereby minimizing flicker and improving display quality.
Implementation Method 1
When a Driver Integrated Circuit (Driver IC) is illuminated by light and then a photovoltaic effect is caused in the Driver IC, carriers such as electrons generated by the photovoltaic effect enter into a data line and change electrical charges in the data line
Data Source
AI summary
A display device is disclosed. The display device includes a first display test signal inputting part, configured to input a first display test signal. The display device also includes a first display test signal controlling part, configured to control the input of the first display test signal. The display device also includes a second display test signal inputting part, configured to input a second display test signal. The display device also includes a first test bus, connected to the first display test signal inputting part. The display device also includes a second test bus, connected to the second display test signal inputting part, where the first test bus and the second test bus are connected with each other.