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Parameter checkout method and device for object being checked

An object and parameter technology, which is used in the field of parameter detection and detection devices for detecting objects, and can solve the problems that the retardation and low transmittance of the liquid crystal layer cannot be correctly detected.

Inactive Publication Date: 2008-04-16
名菱泰科尼卡株式会社 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method disclosed in the above reference 3 is based on the premise that the light transmittance at the position where the transmitted light intensity is measured is extremely small.
Therefore, when the retardation distribution is within the measurement range, the retardation of the liquid crystal layer cannot be accurately detected.

Method used

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  • Parameter checkout method and device for object being checked
  • Parameter checkout method and device for object being checked
  • Parameter checkout method and device for object being checked

Examples

Experimental program
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Effect test

no. 1 example

[0222] In the first embodiment, the inclination angle ω of the transmission axis direction of the analyzer 13 with respect to the incident surface (hereinafter referred to as "transmission axis direction ω of the analyzer 13") is set to an arbitrary angle. In addition, the inclination angle α of the transmission axis direction of the polarizer 11 with respect to the incident surface (hereinafter referred to as "the transmission axis direction α of the polarizer 11") is set to an angle (α=0°) parallel to the incident surface ) and the angle perpendicular to the incident plane (α=90°). The transmitted light intensity was measured in each state. Then, the parameters of the VA element 12 (detection object) are detected using the ratio r of the measured transmitted light intensity.

[0223] Set the transmission axis direction ω of the analyzer 13 to an arbitrary angle ω 0 in the direction (towards the angle ω 0 direction). In addition, the transmission axis direction α of the p...

no. 2 example

[0302] [Equation 13] expressing the transmitted light intensity when the direction of the transmission axis of the polarizer is set in the direction of α, and the direction of the transmission axis of the analyzer is set in the direction of ω, does not change at all even if α and ω are replaced . That is, the polarizer described in the first embodiment can be replaced by an analyzer, and the analyzer can be replaced by a polarizer.

[0303] In the second embodiment, in the state where the transmission axis direction α of the polarizer 11 is set to a direction at an arbitrary angle, the transmission axis direction ω of the analyzer 13 is set to a direction parallel to the incident surface ( ω=0°) and the direction perpendicular to the incident surface (ω=90°), the respective transmitted light intensities were measured. Thus, the parameters of the VA element 12 (detection object) are detected using the ratio r of the measured transmitted light intensity.

[0304] When the tran...

no. 3 example

[0365] In the first or second embodiment, the transmission axis direction ω of the analyzer 13 or the transmission axis direction α of the polarizer 11 is set to a specific direction in order to obtain the ratio r of the transmitted light intensity. Here, the setting operation of the transmission axis direction α of the polarizer 11 and the transmission axis direction ω of the analyzer 13 can be easily performed.

[0366] In the third embodiment, the transmission axis direction α of the polarizer 11 is set to be a direction at an arbitrary angle. In this state, the transmission axis direction ω of the analyzer 13 is set to any direction of three or more different angles, and the respective transmitted light intensities are measured. Then, the retardation R of the liquid crystal layer of the VA cell 12 is detected using the measured three or more transmitted light intensities.

[0367][Formula 13], which represents the transmitted light intensity when the direction of the tran...

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Abstract

To provide a parameter-detecting method of an object to be detected, capable of simply and accurately detecting the parameter of the detection object, and to provide a parameter detector. A ratio r is calculated on the basis of the intensity of transmitted light, when the transmission axis direction of an analyzer 13 is inclined by an arbitrary angle [omega]0, with respect to the incidence plane and the transmission axis direction of a polarizer 11 is inclined by 0[deg.] and 90[deg.], with respect to the incidence plane. Further, the intensity of the transmitted light, when the transmission axis direction of the analyzer 13 is inclined by an arbitrary angle [omega], with respect to the incidence plane and the transmission axis direction of the polarizer 11 is inclined by an arbitrary angle [alpha] with respect to the incidence plane, is detected with respect to a combination of at least two different [omega] and [alpha]. Then, the retardation or the thickness of a detection object 12 is calculated, on the basis of a plurality of the detected intensities of transmitted light and the ratio r.

Description

technical field [0001] The present invention relates to a parameter detection method and detection device for detecting a parameter of a detection target having birefringence characteristics (particularly, retardation and thickness of a liquid crystal layer of the detection target). Background technique [0002] As a liquid crystal display element (hereinafter referred to as "liquid crystal cell") constituting a liquid crystal display device, a liquid crystal cell in which the long-axis direction of liquid crystal molecules is oriented substantially parallel to the substrate surface is used. As such a liquid crystal cell, a twisted nematic (Twisted Nematic: TN) liquid crystal cell, a super twisted nematic (Super Twisted Nematic: STN) liquid crystal cell, and an IPS (In-Plane Switching) liquid crystal cell are known. Epistar. In addition, a liquid crystal cell (hereinafter referred to as a "VA cell") in which the long axis direction of the liquid crystal molecules is aligned...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/13
CPCG01B11/06G01M11/00G01N21/23G02F1/1337G06F17/10
Inventor 藏田哲之佐竹彻也西冈孝博前原利昭金子诚冈部正树前田有纪
Owner 名菱泰科尼卡株式会社
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