Cell thickness detection method, cell thickness control system, and manufacturing method for liquid crystal device
AssigneeSeiko Epson Corporation
InventorMasahiro Kuroiwa
Life of this patent
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Abstract
Light is transmitted through a compressing clamp which clamps the liquid crystal display panel 10, and the spectrum of light is obtained by a spectrometer 141. A cell thickness is detected based on a wavelength or a frequency at which the spectrum has the minimum or maximum value. The obtained cell thickness is compared with a desired value, and a pressure control unit 132 supplies the compressing clamp with a fluid in accordance with the result of the comparison.
Claims13
A cell thickness detection method for detecting a cell thickness of a liquid crystal panel which is constructed by laminating two substrates and disposing a liquid crystal layer between the substrates, the cell thickness detection method comprising the steps of:
- setting a light path for transmitting light through a first polarizing means, the liquid crystal layer, and a second polarizing means, in that order;
- obtaining a spectrum of light which is transmitted along the light path;
- deriving a detection value which is a wavelength, a value related to the wavelength, a frequency, or a value related to the frequency at which the spectrum has a minimum or maximum value;
- and
- determining the cell thickness based on the detection value.
A cell thickness control system for controlling a cell thickness of a liquid crystal panel which is constructed by laminating two substrates and disposing a liquid crystal layer between the substrates, the cell thickness control system comprising:
- compressing means for applying a controlled pressure to the liquid crystal panel;
- an optical detection system including a light source for transmitting light through a first polarizing means, the liquid crystal layer, and a second polarizing means, in that order;
- spectrum obtaining means for obtaining a spectrum of light which is emitted from the optical detection system;
- a computer for deriving a detection value which is a wavelength, a value related to the wavelength, a frequency, or a value related to the frequency at which the spectrum has a minimum or maximum value;
- and
- controlling means for controlling the pressure of the compressing means so that the detection value becomes closer to a value corresponding to a desired value of the cell thickness.
A manufacturing method for a liquid crystal device including a liquid crystal panel which is constructed by laminating two substrates and disposing a liquid crystal layer between the substrates, the manufacturing method for a liquid crystal device comprising the steps of:
- setting a light path for transmitting light through a first polarizing means, the liquid crystal layer, and a second polarizing means, in that order;
- obtaining a spectrum of light which is transmitted along the light path;
- deriving a detection value which is a wavelength, a value related to the wavelength, a frequency, or a value related to the frequency at which the spectrum has a minimum or maximum value;
- and
- compressing the liquid crystal panel in accordance with the detection value and making adjustments so that the detection value becomes almost the same as a value corresponding to a desired value of the cell thickness.
A cell thickness detection method for detecting a cell thickness of a liquid crystal panel which is constructed by disposing two substrates in such a manner that the substrates oppose each other and disposing a liquid crystal layer between the substrates, the cell thickness detection method comprising the steps of:
- setting a light path for transmitting light through a first polarizing means, the liquid crystal layer, and a second polarizing means, in that order;
- obtaining a spectrum of light which is transmitted along the light path;
- deriving a detection value which is a wavelength or a frequency at which the spectrum has a minimum or maximum value;
- and
- determining the cell thickness based on the detection value.
A cell thickness detection method for detecting a cell thickness of a liquid crystal panel which is constructed by disposing two substrates in such a manner that the substrates oppose each other and disposing a liquid crystal layer between the substrates, the cell thickness detection method comprising the steps of:
- setting a light path for transmitting light through a first polarizing means, the liquid crystal layer, and a second polarizing means, in that order;
- obtaining a spectrum of light which is transmitted along the light path;
- deriving a detection value which is a value corresponding to a wavelength or a frequency at which the spectrum has a minimum or maximum value;
- and
- determining the cell thickness based on the detection value.
Dependencies are inferred from the claim text.