P‐79: Light Leakage Improvement of LCD Module by Numerical Analysis

Chen, Yung-Kan; Lin, Mao-Hsing; Huang, Kun-Feng

doi:10.1889/1.2785340

Cited by 12 publications

(7 citation statements)

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“…Light leakage of polarizer film induced by temperature gradient and non-uniform thermal stress distribution from backlight is the most normal and serious problem for a LCD panel [96][97][98]. The light leakage of a TN mode LCD panel in the black state is shown in Fig.…”

Section: Light Leakagementioning

confidence: 99%

Structure and application of polarizer film for thin-film-transistor liquid crystal displays

Jin

2011

Displays

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Section: Light Leakagementioning

confidence: 99%

Structure and application of polarizer film for thin-film-transistor liquid crystal displays

Jin

2011

Displays

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“…With these facts we can say that up-and-down light leakage is influenced by the structural relation between loaded PVA direction of polarizer and lamp direction of backlight as a stress source. About backlight Chi Mei Optoelectronics (CMO) studied up-and-down light leakage and showed the light leakage enhancement through changing backlight material to flatten temperature distribution [2]. Our topic is up-and-down light leakage.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Light Leakage of LCD Module and Improvement by Cell Rubbing Angle

Jo¹,

Ahn²,

Park³

et al. 2009

Molecular Crystals and Liquid Crystals

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We discuss the light leakage issue of LCD due to stress to the polarizer from the backlight temperature. To detect light leakage, we measured black luminance and low gray scale curves by backlight running time. The result shows that gray scale curve's change at upper side of light leakage shift up and that of right and left side shift down. These phenomena are similar to phenomenon from variation of WV-TAC axis. To discuss this result, we insist the heated part of polarizer must be expanded. Finally, our experiment result by changing rubbing angle of cell shows improvement of light leakage.

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“…One of the most serious problems of TFT‐LCDs is a phenomenon called “light leakage” . It stands for “unevenness” or irregular pattern in screen uniformity at low light conditions caused by temperature gradient and non‐uniform thermal stress distribution from the backlight.…”

Section: Introductionmentioning

confidence: 99%

Effect of chemical structure of acrylic pressure‐sensitive adhesives for polarizing film on light leakage phenomenon in TFT‐LCDs

Nam

Lee

et al. 2011

Polymers for Advanced Techs

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Increasing image quality in thin‐film transistor liquid crystal displays (TFT‐LCD) is a recognized challenge for electronic companies and specialists working in this area. One of the main problems in TFT‐LCDs is a phenomenon called “light leakage”, affecting black–white contrast and color brightness. It occurs because of a heat‐induced shrinkage and disorientation of the polarizing film of TFT‐LCD, which controls the intensity of the light from the backlight unit. Improvement of the light leakage can be achieved through using a pressure‐sensitive adhesive (PSA) used for assembling the polarizing film onto the TFT‐LCD panel. In this paper, eight acrylic/methacrylic monomers with high glass transition temperature (Tg) were employed for synthesis of the polymers for the adhesive. Effect of structure, Tg, and elasticity modulus of the synthesized polymers on the light leakage was investigated simultaneously for 2.5‐ and 7.0‐in. size samples. We demonstrated that the light leakage can be minimized through two different mechanisms—high stress relaxation of the polymers with low Tg and low modulus and high shrinkage resistance of the polymers with high Tg and high modulus. The results of this work indicate a possibility to develop a universal PSA for polarizing film in TFT‐LCDs of different sizes that will have a positive effect on manufacturing productivity and lowering prices of digital devices. Copyright © 2011 John Wiley & Sons, Ltd.

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P‐79: Light Leakage Improvement of LCD Module by Numerical Analysis

Cited by 12 publications

References 0 publications

Structure and application of polarizer film for thin-film-transistor liquid crystal displays

Structure and application of polarizer film for thin-film-transistor liquid crystal displays

Analysis of Light Leakage of LCD Module and Improvement by Cell Rubbing Angle

Effect of chemical structure of acrylic pressure‐sensitive adhesives for polarizing film on light leakage phenomenon in TFT‐LCDs

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