JP2004302229A - Method for detecting film member of liquid crystal display device - Google Patents

Method for detecting film member of liquid crystal display device Download PDF

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Publication number
JP2004302229A
JP2004302229A JP2003096269A JP2003096269A JP2004302229A JP 2004302229 A JP2004302229 A JP 2004302229A JP 2003096269 A JP2003096269 A JP 2003096269A JP 2003096269 A JP2003096269 A JP 2003096269A JP 2004302229 A JP2004302229 A JP 2004302229A
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Prior art keywords
film member
liquid crystal
crystal display
light
display device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
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JP2003096269A
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Japanese (ja)
Inventor
Tojutsu Sai
東術 崔
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyocera Display Corp
Original Assignee
Kyocera Display Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kyocera Display Corp filed Critical Kyocera Display Corp
Priority to JP2003096269A priority Critical patent/JP2004302229A/en
Publication of JP2004302229A publication Critical patent/JP2004302229A/en
Pending legal-status Critical Current

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for detecting a film member of a liquid crystal display device that can securely detect the film member. <P>SOLUTION: A light emitting unit of an optical sensor 11 projects beltlike light on the liquid crystal display panel 1 and a light emitting unit receives reflected light of the beltlike light to detect whether a film member 3 is stuck on the liquid crystal display panel 1 on the basis of the quantity of the beltlike reflected light received by the light receiving unit. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、液晶表示装置におけるフィルム部材の検出方法に関する。
【0002】
【従来の技術】
従来から、文字や図形などの各種の情報を表示する表示装置の一種として液晶表示装置が知られており、このような液晶表示装置の表示部として、一対の基板の間に液晶が封入された液晶表示パネルが用いられている。
【0003】
このような液晶表示装置として、液晶表示パネルに外光を透過あるいは反射するフィルム部材を貼着した構成のものがある。ここでいうフィルム部材とは、例えば液晶表示パネルの観察側とは反対側の背面側に貼着される光学フィルムなどを挙げることができる。なお、光学フィルムとしては、情報の表示時における背景色を得るための単色の有色フィルムからなるカラーフィルタや、拡散フィルム、反射板、半透過板などを挙げることができる。
【0004】
ところで、液晶表示パネルにフィルム部材を貼着することにより構成されている液晶表示装置は、その製造過程において、液晶表示パネルにフィルム部材を貼着する工程がある。このフィルム部材の貼着工程においては、フィルム部材を貼着する前に、液晶表示パネルにフィルム部材が既に貼られているか否かを検出することで、液晶表示パネルに対するフィルム部材の二重貼りを防止するようにされている。
【0005】
このようなフィルム部材の有無の検出は、目視では判断が困難などの理由により、図2に示すように、液晶表示パネル1に向かって反射型の光センサ2の発光器からスポット状の光を出射し、この光の反射光を受光器で受光し、受光した光の光量に基づいて行われている。すなわち、フィルム部材3の有無を、反射光の光量に基づいて検出するようにされている。
【0006】
例えば、液晶表示パネル1にカラーフィルタなどのフィルム部材3が正常に貼着されているときの光センサ2の受光器が受光する反射光の光量を閾値として予め設定しておき、受光した反射光の光量が閾値以上の場合、あるいは閾値以下の場合、あるいは所定範囲内の場合に、フィルム部材3「無し」と検出し、逆の場合には、フィルム部材3が既に貼着されているフィルム部材3「有り」と検出するとともに、ブザーなどの警告手段を動作させ、かつ、製造ラインをストップするように構成されている。
【0007】
【発明が解決しようとする課題】
しかしながら、従来のフィルム部材の検出方法においては、フィルム部材3があるにもかかわらずフィルム部材3を「無し」と検出する誤検出が生じ、正確な検出をすることができないという問題点があった。
【0008】
すなわち、光センサ2のスポット状の出射光が照射されるフィルム部材3の表面の照射部の一部に、ゴミなどの小さな異物が付着していたり、マークが形成されていると、こられの異物および/またはマークなどの非適正部(図2に小さな斜線領域にて示す)4の存在により、光センサ2の受光器が受光する反射光の光量が正常な場合と異なってしまい、フィルム部材3があるにもかかわらず、フィルム部材3の有無を「無し」と誤検出し、フィルム部材3の二重貼りが生じるという問題点があった。
【0009】
なお、マークとは、例えば搬送時や取扱時に汚れや損傷を防止するためフィルム部材に貼り付けられている保護用被覆フィルムの表面に形成されているロゴ、製造ロット番号、型番などであり、保護用被覆フィルム自体の色とは異なる視認性のよい色が用いられている。このマークを複数設けた保護用被覆フィルムは、フィルム部材が切り出されるサイズの大きな原反に対して貼り付けられているので、原反から切り出された多数のフィルム部材の表面のランダムな位置にマークが存在することになる。
【0010】
本発明はこの点に鑑みてなされたものであり、フィルム部材を確実に検出することのできる液晶表示装置におけるフィルム部材の検出方法を提供することを目的とする。
【0011】
【課題を解決するための手段】
前述した目的を達成するため特許請求の範囲の請求項1に係る本発明の液晶表示装置におけるフィルム部材の検出方法の特徴は、液晶表示パネルに対して発光器から光を出射し、前記光の反射光を受光器で受光し、前記受光器で受光した反射光の光量に基づいて前記液晶表示パネルに貼着されているフィルム部材の有無を検出する液晶表示装置におけるフィルム部材の検出方法において、前記フィルム部材の有無を検出する際に用いる光が帯状に形成されている点にある。そして、このような構成を採用したことにより、帯状の光は照射範囲を大きくして反射光の光量の標準化を容易に図ることができるので、照射領域の一部に異物やマークが存在しても反射光の光量変化を少なくすように働く。したがって、フィルム部材を確実に検出することができる。
【0012】
また、請求項2に係る本発明の液晶表示装置におけるフィルム部材の検出方法は、請求項1において、前記フィルム部材が、光学フィルムである点にある。そして、このような構成を採用したことにより、液晶表示パネルに貼着する光学フィルムの二重貼りを確実に防止することができる。
【0013】
【発明の実施の形態】
以下、本発明を図面に示す実施形態により説明する。なお、前述した従来のものと同一の構成については図面中に同一の符号を付す。
【0014】
図1は本発明に係る液晶表示装置におけるフィルム部材の検出方法の実施形態におけるフィルム部材の検出状態を示す模式図である。
【0015】
図1に示すように、本実施形態の液晶表示装置におけるフィルム部材の検出方法は、液晶表示パネル1に向かって反射型の光センサ11の発光器から帯状の光を出射し、この光の反射光を受光器で受光し、受光した光の光量に基づいて行われている。すなわち、フィルム部材3の有無を、帯状の反射光の光量に基づいて検出するようにされている。
【0016】
具体的には、液晶表示パネル1にフィルム部材3が正常に貼着されているときの光センサ11の受光器が受光する反射光の光量を閾値として予め設定しておき、受光した反射光の光量が閾値以上の場合、あるいは閾値以下の場合、あるいは所定範囲内の場合に、フィルム部材3「無し」と検出し、逆の場合には、フィルム部材3が既に貼着されているフィルム部材3「有り」と検出するとともに、ブザーなどの警告手段を動作させ、かつ、製造ラインをストップするように構成されている。
【0017】
前記フィルム部材3としては、光センサ11の発光器からの光の反射光を得ることのできるもの、例えば光学フィルムなどを挙げることができる。
【0018】
なお、光学フィルムとしては、情報の表示時における背景色を得るための単色の有色フィルムからなるカラーフィルタや、拡散フィルム、反射板、半透過板などを挙げることができる。
【0019】
つぎに、前述した構成からなる本実施形態の作用について説明する。
【0020】
本実施形態の液晶表示装置におけるフィルム部材の検出方法によれば、光センサ11の発光器から照射される帯状の光は照射範囲を大きくして反射光の光量の標準化を容易に図ることができるので、出射光の照射領域の一部に異物やマークなどの非適正部4が存在しても、反射光の光量変化を少なくすように働く。
【0021】
したがって、本実施形態の液晶表示装置におけるフィルム部材の検出方法によれば、フィルム部材3を確実に検出することができる。
【0022】
また、本実施形態の液晶表示装置におけるフィルム部材の検出方法によれば、フィルム部材3が、光学フィルムであるから、液晶表示パネル1に貼着する光学フィルムの二重貼りを確実に防止することができる。
【0023】
なお、本発明は前記実施形態に限定されるものではなく、必要に応じて種々変更することができる。
【0024】
【発明の効果】
以上説明したように請求項1に係る本発明の液晶表示装置におけるフィルム部材の検出方法によれば、フィルム部材を確実に検出することができるなどの極めて優れた効果を奏する。
【0025】
また、請求項2に係る本発明の液晶表示装置におけるフィルム部材の検出方法によれば、晶表示パネルに貼着する光学フィルムの二重貼りを確実に防止することができるなどの極めて優れた効果を奏する。
【図面の簡単な説明】
【図1】本発明に係る液晶表示装置におけるフィルム部材の検出方法の実施形態におけるフィルム部材の検出状態を示す模式図
【図2】従来の液晶表示装置におけるフィルム部材の検出方法におけるフィルム部材の検出状態を示す模式図
【符号の説明】
1 液晶表示パネル
3 フィルム部材
4 非適正部
11 光センサ
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for detecting a film member in a liquid crystal display device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a liquid crystal display device is known as a type of display device that displays various types of information such as characters and figures. As a display portion of such a liquid crystal display device, liquid crystal is sealed between a pair of substrates. A liquid crystal display panel is used.
[0003]
As such a liquid crystal display device, there is a liquid crystal display device having a structure in which a film member that transmits or reflects external light is attached to a liquid crystal display panel. The film member referred to here includes, for example, an optical film adhered to the rear side of the liquid crystal display panel opposite to the observation side. In addition, as an optical film, a color filter composed of a single-colored film for obtaining a background color when displaying information, a diffusion film, a reflection plate, a semi-transmission plate, and the like can be given.
[0004]
By the way, in a liquid crystal display device configured by sticking a film member to a liquid crystal display panel, there is a step of sticking the film member to the liquid crystal display panel in a manufacturing process. In the attaching step of the film member, before attaching the film member, by detecting whether or not the film member is already attached to the liquid crystal display panel, the double attachment of the film member to the liquid crystal display panel is performed. Is to be prevented.
[0005]
As shown in FIG. 2, the detection of the presence or absence of such a film member is performed by emitting spot-like light from the light-emitting device of the reflection-type optical sensor 2 toward the liquid crystal display panel 1, as shown in FIG. The light is emitted, and the reflected light of the light is received by a light receiver, and the detection is performed based on the amount of the received light. That is, the presence or absence of the film member 3 is detected based on the amount of reflected light.
[0006]
For example, the amount of reflected light received by the light receiver of the optical sensor 2 when the film member 3 such as a color filter is normally adhered to the liquid crystal display panel 1 is set in advance as a threshold, and the received reflected light is set. If the light amount is equal to or greater than the threshold value, or equal to or less than the threshold value, or within a predetermined range, the film member 3 is detected as “absent”, and in the opposite case, the film member 3 to which the film member 3 has already been stuck. 3. The system is configured to detect "present", activate a warning means such as a buzzer, and stop the production line.
[0007]
[Problems to be solved by the invention]
However, in the conventional method of detecting a film member, there is a problem that erroneous detection of detecting the film member 3 as “absent” occurs despite the presence of the film member 3, and that accurate detection cannot be performed. .
[0008]
In other words, if a small foreign substance such as dust adheres or a mark is formed on a part of the irradiation part on the surface of the film member 3 to which the spot-shaped emission light of the optical sensor 2 is irradiated, this is Due to the presence of an improper portion (indicated by a small hatched area in FIG. 2) 4 such as a foreign substance and / or a mark, the amount of reflected light received by the light receiver of the optical sensor 2 differs from the normal case, and the film member 3, the presence or absence of the film member 3 is erroneously detected as "absent", and there is a problem that the film member 3 is double-sticked.
[0009]
The mark is, for example, a logo, a production lot number, a model number, etc. formed on the surface of a protective covering film attached to a film member to prevent dirt and damage during transportation and handling. A color with good visibility different from the color of the coating film itself is used. Since the protective coating film provided with a plurality of marks is attached to a large raw material from which the film member is cut out, marks are provided at random positions on the surface of a large number of film members cut out from the raw material. Will exist.
[0010]
The present invention has been made in view of this point, and an object of the present invention is to provide a method of detecting a film member in a liquid crystal display device that can reliably detect the film member.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, a feature of the method for detecting a film member in the liquid crystal display device according to the present invention according to claim 1 is that light is emitted from a light emitting device to a liquid crystal display panel, A method for detecting a film member in a liquid crystal display device that receives reflected light with a light receiver and detects the presence or absence of a film member attached to the liquid crystal display panel based on the amount of reflected light received by the light receiver, The light used for detecting the presence or absence of the film member is formed in a belt shape. And, by adopting such a configuration, the belt-shaped light can be easily irradiated and the standardized amount of reflected light can be easily achieved. Also works to reduce the change in the amount of reflected light. Therefore, the film member can be reliably detected.
[0012]
According to a second aspect of the present invention, there is provided a method for detecting a film member in a liquid crystal display device according to the first aspect, in which the film member is an optical film. And by employing such a configuration, double sticking of the optical film stuck to the liquid crystal display panel can be reliably prevented.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described with reference to embodiments shown in the drawings. The same components as those of the above-described conventional device are denoted by the same reference numerals in the drawings.
[0014]
FIG. 1 is a schematic diagram showing a detection state of a film member in an embodiment of a method for detecting a film member in a liquid crystal display device according to the present invention.
[0015]
As shown in FIG. 1, in the method for detecting a film member in the liquid crystal display device of the present embodiment, a band-like light is emitted from the light emitter of the reflection type optical sensor 11 toward the liquid crystal display panel 1, and the reflection of this light is performed. The light is received by a light receiver, and the detection is performed based on the amount of the received light. That is, the presence or absence of the film member 3 is detected based on the amount of the strip-shaped reflected light.
[0016]
Specifically, the amount of reflected light received by the light receiver of the optical sensor 11 when the film member 3 is normally adhered to the liquid crystal display panel 1 is set in advance as a threshold, and the amount of reflected light received is set. When the amount of light is equal to or greater than the threshold, or equal to or less than the threshold, or within a predetermined range, the film member 3 is detected as “absent”, and in the opposite case, the film member 3 to which the film member 3 has already been stuck. The system is configured to detect "present", activate a warning means such as a buzzer, and stop the production line.
[0017]
Examples of the film member 3 include a member capable of obtaining reflected light of light from the light emitter of the optical sensor 11, for example, an optical film.
[0018]
In addition, as an optical film, a color filter consisting of a monochromatic colored film for obtaining a background color at the time of displaying information, a diffusion film, a reflection plate, a semi-transmission plate, and the like can be given.
[0019]
Next, the operation of the present embodiment having the above-described configuration will be described.
[0020]
According to the method for detecting a film member in the liquid crystal display device of the present embodiment, it is possible to easily standardize the amount of reflected light by expanding the irradiation range of the belt-like light emitted from the light emitter of the optical sensor 11. Therefore, even if there is an improper part 4 such as a foreign substance or a mark in a part of the irradiation area of the emitted light, it works to reduce the change in the amount of reflected light.
[0021]
Therefore, according to the method for detecting a film member in the liquid crystal display device of the present embodiment, the film member 3 can be reliably detected.
[0022]
Further, according to the method for detecting a film member in the liquid crystal display device of the present embodiment, since the film member 3 is an optical film, it is possible to reliably prevent the optical film attached to the liquid crystal display panel 1 from being double-sticked. Can be.
[0023]
Note that the present invention is not limited to the above-described embodiment, and can be variously modified as needed.
[0024]
【The invention's effect】
As described above, according to the method for detecting a film member in the liquid crystal display device according to the first aspect of the present invention, an extremely excellent effect such as a reliable detection of the film member can be obtained.
[0025]
Further, according to the method for detecting a film member in a liquid crystal display device of the present invention according to the second aspect, an extremely excellent effect such as double prevention of an optical film attached to a crystal display panel can be reliably prevented. Play.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a detection state of a film member in an embodiment of a method of detecting a film member in a liquid crystal display device according to the present invention. FIG. 2 is a diagram showing detection of a film member in a detection method of a film member in a conventional liquid crystal display device. Schematic diagram showing the state [Explanation of reference numerals]
DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 3 Film member 4 Unsuitable part 11 Optical sensor

Claims (2)

液晶表示パネルに対して発光器から光を出射し、前記光の反射光を受光器で受光し、前記受光器で受光した反射光の光量に基づいて前記液晶表示パネルに貼着されているフィルム部材の有無を検出する液晶表示装置におけるフィルム部材の検出方法において、
前記フィルム部材の有無を検出する際に用いる光が帯状に形成されていることを特徴とする液晶表示装置におけるフィルム部材の検出方法。
A film that emits light from a light emitter to a liquid crystal display panel, receives reflected light of the light with a light receiver, and is attached to the liquid crystal display panel based on the amount of reflected light received by the light receiver. In a method for detecting a film member in a liquid crystal display device for detecting the presence or absence of a member,
A method for detecting a film member in a liquid crystal display device, wherein light used for detecting the presence or absence of the film member is formed in a belt shape.
前記フィルム部材が、光学フィルムである請求項1に記載の液晶表示装置におけるフィルム部材の検出方法。2. The method according to claim 1, wherein the film member is an optical film.
JP2003096269A 2003-03-31 2003-03-31 Method for detecting film member of liquid crystal display device Pending JP2004302229A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013018342A1 (en) * 2011-08-04 2013-02-07 パナソニック株式会社 Information terminal device and object identification device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013018342A1 (en) * 2011-08-04 2013-02-07 パナソニック株式会社 Information terminal device and object identification device
US20140146640A1 (en) * 2011-08-04 2014-05-29 Panasonic Corporation Information terminal device and object identification device
US9279766B2 (en) * 2011-08-04 2016-03-08 Panasonic Intellectual Property Management Co., Ltd. Information terminal device and object identification device

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