Transflective LCD Contrast Prevention via Intermediary Electrode
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Solution Overview
Problem
Conventional transflective liquid crystal display devices experience reduced reflecting contrast due to the formation of source wiring and reflecting pixel electrodes on the same layer with an interval, leading to a lack of electric field application over the liquid crystal layer between these components, which results in light leakage and reduced display quality.
Innovation Solution
A transflective liquid crystal display device configuration that includes a contrast reduction preventing electrode between the source wiring and reflecting pixel electrode, ensuring a voltage is applied to the liquid crystal layer, thereby preventing light emission towards the display face and enhancing reflecting contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If source wiring and reflecting pixel electrode are formed on the same layer with an interval, then manufacturing process is simplified, but reflecting contrast is reduced due to light leakage
Solution Approach 1:
A contrast improving electrode is introduced as an intermediary component between the source wiring and the reflecting pixel electrode. This electrode is formed on the same layer as the reflecting pixel electrode and extends over the interval region. By applying a specific potential to this contrast improving electrode, an electric field is generated in the liquid crystal layer above the interval, preventing light leakage and improving reflecting contrast while maintaining the simplified manufacturing structure
2Device complexity
If source wiring and reflecting pixel electrode are formed on the same layer, then device complexity is reduced, but electric field application is insufficient over the liquid crystal layer
Solution Approach 1:
The electrode system is segmented into multiple functional components: source wiring, reflecting pixel electrode, and contrast improving electrode. The contrast improving electrode is specifically positioned and potential-controlled to provide dedicated electric field application over the interval region, ensuring reliable voltage control across the entire liquid crystal layer while maintaining a relatively simple overall layer structure
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 introduction of the contrast reduction preventing electrode effectively applies an electric field to the liquid crystal layer, improving display characteristics by maintaining high reflecting contrast and preventing light leakage, thus enhancing the overall display quality.
Implementation Method 1
a voltage is applied to the liquid crystal layer between the contrast reduction preventing electrode and the opposite electrode so that the light reflected from the storage capacitive electrode does not emit toward a display face
Data Source
AI summary
A transflective liquid crystal display device in which a transmissive area to transmit light to a pixel area and a reflective area as well as a thin film transistor are arranged on an insulating substrate, includes an TFT array substrate having plural gate wirings each provided with a gate electrode and a storage capacitive wiring provided with a storage capacitive electrode made of a first conductive film, plural source wirings each provided with a source electrode and a drain electrode made of a second conductive film, a reflecting pixel electrode extending from the drain electrode, and a transmissive pixel electrode formed through a second insulating film, and an opposite substrate arranged oppositely to the TFT array substrate. The source wirings and the reflecting pixel electrode are arranged apart from each other by a predetermined interval, and a contrast preventing electrode is formed over the interval on the second insulating film.