顏料分散彩色濾光片造成TFT-LCD對比度下降機制之討論

廖偉翔

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Cellege of Optoelectronics > Graduate Institute of Photonic System
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顏料分散彩色濾光片造成TFT-LCD對比度下降機制之討論

Discussion on the Contrast-Ratio Degradation of TFT-LCDs Caused by Pigmented Color Filter

廖偉翔 , Masters　　Advisor：楊界雄　　

繁體中文

彩色濾光片；對比度；物理機制；瓊斯矩陣；米氏散射； color filter ； contrast ratio ； mechanism ； Jones matrix ； Mie scattering

Abstract │ Reference (27) │ Altmetrics

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The most popular color generation of TFT-LCDs has been based on pigment dispersed (PD) color filters (CFs) built in the LCD panel to produce sub-pixel-red (R), -green (G), and –blue (B) colors from a backlight system attached onto the panel. Experimental results showed that, by placing such PDCF plate between cross polarizers, additional light leakage occurred due to the change of the linearly polarized input light into elliptically polarized output light. We call this effect as the depolarization-induced degradation of contrast ratio (DID-CR) due to the PDCF.

The DID-CR depends on the particle size of PDCF. So far, there have been no prior publications to explain the mechanism of DID-CR of the PDCF. In this thesis, we suggest two optical models: birefringent effect (BRE) and Mie scattering effect (MSE) caused by PDCF particles to explain the phenomenon of DID-CR.

In the BRE model, we use Jones matrix method to calculate the DID effect through a PDCF of fixed thickness but composed of multi-layer pigment-particles of different sizes. Using the BRE model, we have confirmed the occurrence of DID-CR that is proportional to the particle sizes within the PDCF plate consistent with published results.

In our MSE model, we have assumed that the PDCF particles are optically isotropic and the effect of DID-CR disappears for forward-scattered lights independent of particles sizes. For fixed particle size, the effect of DID-CR increases with increasing oblique-scattered angles and the scattered intensity within the same solid angle increases as the particle size decreases. The MSE model at this moment of development is unable to produce suitable numerical results to compare with the experimental results that the effect of DID-CR is more severe with larger particles and much reduced with smaller particles within the PDCF layer.

Reference ( 27 ) 〈TOP〉

[2] Jae Hyun Kim, Joun Ho Lee, Ji Chul Lim, et al., “9.3: The Novel Technologies for Achieving Contrast Ratio over 1:600 in IPS Mode”, SID 04 Digest, 115 (2004).
連結：
[3] Te-Sheng Chen, Chien-Wei Huang, Chung-Ching Hsieh, et al., “52.1: Invited Paper: Advanced MVA III Technology for High-Quality LCD TVs”, SID 09 Digest, 776 (2009).
連結：
[4] R. C. Jones, J. opt. Soc. A. 31, 488 (1941).
連結：
[6] H. C. van de Hulst, Light Scattering by small Particles, Dover Publications, 1981.
連結：
[8] Craig F. Bohren, Donald R. Huffman, Absorption and Scattering of Light by Small Particles, A Wiley-Interscience Publication, 1983
連結：

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