Technology Trends for Improving Contrast Ratio in IPS Mode

Kim, Sung Jin; Lee, Sang Yoon; Park, Jong Sub; Ko, Jeong Hoon; Lee, Im Soo; Hong, Young Tae; Soh, H. S.; Kim, Woo Yeol

doi:10.1080/15421400500236758

Cited by 7 publications

(3 citation statements)

References 1 publication

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“…However, several studies show that the IPS contrast ratio can be easily degraded. [2][3][4][5][6][7] The IPS LCDs work on normally black operation. In order to obtain low light leakage in them, a set of polarizer and analyzer should be kept under crossed Nicols condition with high accuracy, and their liquid crystal layers must have a director profile completely parallel to the polarizer transmissive axis without any twist angles.…”

Section: Introductionmentioning

confidence: 99%

Transmittance Fluctuation from Nearly Extinct Nematic Cells

Sumiyoshi¹

2010

Jpn. J. Appl. Phys.

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The tensor formalism developed by Johnston for the elastic scattering of neutrons by magnetic salts is extended to several unfilled shells configurations. The case of two shells is investigated completely. Some examples of the crystals having this configuration are presented and a simple example of the U 4 + ion is worked out. Finally, the method for the generalization of the theory to a configuration of N shells is given.

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Section: Introductionmentioning

confidence: 99%

Transmittance Fluctuation from Nearly Extinct Nematic Cells

Sumiyoshi¹

2010

Jpn. J. Appl. Phys.

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“…Several studies have pointed out that several causes reduce IPS contrast ratio. [2][3][4][5][6][7] Those causes can be classified into two classes: those that induce the first static light leakage and those that induce the second dynamic light leakage. The first class includes the depolarization effect of color filters, 2) the incompleteness of rubbing alignment caused by surface morphology, 2) and the assembly misalignment of the liquid crystal layer and polarizers.…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4][5][6][7] Those causes can be classified into two classes: those that induce the first static light leakage and those that induce the second dynamic light leakage. The first class includes the depolarization effect of color filters, 2) the incompleteness of rubbing alignment caused by surface morphology, 2) and the assembly misalignment of the liquid crystal layer and polarizers. 4,6,7) This class teaches us that IPS contrast ratio is sensitive and fine controls are needed for high-contrast-ratio IPS LCDs.…”

Section: Introductionmentioning

confidence: 99%

Light Leakage Analysis of In-Plane-Switching Liquid Crystal Displays

Sumiyoshi

2009

Jpn. J. Appl. Phys.

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Light leakage in in-plane-switching liquid crystal displays (IPS LCDs) has been examined by image analysis and photon correlation measurement under a microscope. Static light leakage could be decomposed into a temperature-insensitive uniform part and a temperature-sensitive localized part. Nematic fluctuation effects in IPS LCDs are quantitatively clarified as follows. High-speed camera observation shows that dynamic fluctuation movements in a nematic layer modulate pixel images with static light leakage. The fluctuation level in the camera image is about 20% of the mean. However, spatial averaging over LCD pixel size suppresses fluctuation level into 3 -5%. This result coincides with the photon correlation measurement results.

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Contrast ratio of colorant film: Theoretical consideration and effect of polymeric binder

Park

2010

J of Applied Polymer Sci

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We made theoretical approaches concerning the optical property of a pigment-containing system to understand the conditions under which an enhanced contrast can be achieved. Maintaining a uniform distribution of pigment particles in thin film well, as in millbase dispersion, is considered critical for a higher contrast. As a specific case, we estimated the effect of a polymeric binder on the contrast ratio. Chemical composition of the dispersion binder has a huge effect, and carboxylate in its long side chain plays a favorable role. Using this binder, we were able to obtain a smooth surface and uniformity, and an enhancement of contrast ratio in the colorant film.

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Technology Trends for Improving Contrast Ratio in IPS Mode

Cited by 7 publications

References 1 publication

Transmittance Fluctuation from Nearly Extinct Nematic Cells

Transmittance Fluctuation from Nearly Extinct Nematic Cells

Light Leakage Analysis of In-Plane-Switching Liquid Crystal Displays

Contrast ratio of colorant film: Theoretical consideration and effect of polymeric binder

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