KR20100088823A - Display device and its manufacturing method - Google Patents

Display device and its manufacturing method Download PDF

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Publication number
KR20100088823A
KR20100088823A KR1020090007939A KR20090007939A KR20100088823A KR 20100088823 A KR20100088823 A KR 20100088823A KR 1020090007939 A KR1020090007939 A KR 1020090007939A KR 20090007939 A KR20090007939 A KR 20090007939A KR 20100088823 A KR20100088823 A KR 20100088823A
Authority
KR
South Korea
Prior art keywords
liquid crystal
crystal panel
window
adhesive tape
display device
Prior art date
Application number
KR1020090007939A
Other languages
Korean (ko)
Inventor
서태식
Original Assignee
주식회사 삼영테크놀로지
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 주식회사 삼영테크놀로지 filed Critical 주식회사 삼영테크놀로지
Priority to KR1020090007939A priority Critical patent/KR20100088823A/en
Publication of KR20100088823A publication Critical patent/KR20100088823A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1303—Apparatus specially adapted to the manufacture of LCDs
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
    • G02F1/13471—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H04M1/0266—Details of the structure or mounting of specific components for a display module assembly

Abstract

PURPOSE: A display device of a portable terminal capable of enabling a user to directly feel a picture quality of a liquid crystal panel and a manufacturing method thereof are provided to remove air layer between A window and a liquid crystal panel. CONSTITUTION: A window(110) protects a liquid crystal panel(140). An OCA(Optically Clear Adhesive) tape(130) is adhered on a screen of the liquid crystal panel. An UV(UltraViolet) glue layer(120) attaches the window to the OCA tape. A knob is formed in one end of the OCA tape for a user to detach the OCA tape from the liquid crystal panel.

Description

DISPLAY DEVICE AND ITS MANUFACTURING METHOD}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device of a portable terminal and a method of manufacturing the same, and more particularly, to a display device of a portable terminal and a method of manufacturing the same for making a screen clearly visible.

1 is a cross-sectional view of a display device of a conventional portable terminal.

As shown in FIG. 1, a display device 10 of a conventional portable terminal is used to bond a liquid crystal panel 15, a PC or PET film 13, and a film 13 to a liquid crystal panel 15. An optically clear adhesive tape (OCA tape; 12) for adhering the double-sided tape 14, the window 11 for protecting the liquid crystal panel 15, and the window 11 to the film 13 It can be made, including.

However, according to the display device 10 of the conventional portable terminal, as shown in FIG. 1, an air gap is formed between the liquid crystal panel 15 and the film 13. There was a problem that the contrast ratio was lowered.

Here, the contrast ratio, as is well known, refers to the difference between the brightness of the white and the brightness of the black represented on the screen, and serves as the biggest factor in determining the image quality. Usually, the higher the contrast, the clearer the picture looks. Even with high resolution products, if the contrast ratio is low, the overall image quality will look poor.

In other words, the contrast ratio is a ratio of the brightness when the screen is expressed in the brightest white when the brightness is set to 1 when the darkest black is displayed. For example, the contrast ratio 1500 may be said that white is 1500 times brighter than black. In other words, the higher the contrast ratio, the clearer the difference between white and black, the clearer the screen looks.

As a result, in the display device 10 of the conventional portable terminal, the air layer has become a major factor in reducing the performance of the liquid crystal panel, that is, the contrast ratio.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and provides a display device and a manufacturing method of a portable terminal having no air layer between the window and the liquid crystal panel so that the image quality of the liquid crystal panel can be transmitted to the user as it is. For the purpose.

In order to achieve the above object, a display device of a portable terminal of the present invention includes a liquid crystal panel; A window for protecting the liquid crystal panel; An optically clear adhesive tape adhered to the screen of the liquid crystal panel; And a UV glue layer attaching the window to the optically clear adhesive tape.

In the above-described configuration, it is preferable that one end of the optical transparent adhesive tape is formed with a handle for allowing a user to detach the optical transparent adhesive tape from the liquid crystal panel.

A display device manufacturing method of a portable terminal of the present invention includes the steps of removing the protective paper attached to the adhesive surface of the optical transparent adhesive tape; Facing the adhesive surface of the optical transparent adhesive tape and the screen of the liquid crystal panel, and then attaching the optical transparent adhesive tape to the liquid crystal panel using a roller; After the attaching step, discharging the UV glue liquid to the other side of the optically transparent adhesive tape; After the discharging step, by laminating a window on the other side of the optically transparent adhesive tape to spread the UV glue liquid by the weight of the window; And attaching the window to the optically clear adhesive tape by irradiating ultraviolet rays to cure the UV glue liquid after the UV glue liquid is spread.

According to the display device of the portable terminal of the present invention and a manufacturing method thereof, there is no air layer between the window and the liquid crystal panel so that the image quality of the liquid crystal panel can be transmitted to the user as it is. In addition, a handle is formed at one end of the OCA tape to allow the user to easily detach the OCA tape from the liquid crystal panel, thereby facilitating removal of the OCA tape from the liquid crystal panel when the liquid crystal panel is reused.

Hereinafter, a display device of a mobile terminal and a method of manufacturing the same will be described in detail with reference to the accompanying drawings.

2 is a cross-sectional view of a display device of a mobile terminal according to an embodiment of the present invention, and FIG. 3 is a plan view of the optical transparent adhesive tape shown in FIG. 2.

As shown in FIG. 2, the display device 100 of the mobile terminal according to the present invention includes a liquid crystal panel 140, a window 110 for protecting the liquid crystal panel 140, and a liquid crystal panel 140. Optically clear adhesive tape (OCA tape; 130) and UV (ultraviolet) glue layer 120 for attaching the window 110 to the OCA tape 130. It is made, including. Accordingly, there is no air layer between the window 110 and the liquid crystal panel 140 so that the image quality of the liquid crystal panel 140 can be transmitted to the user as it is.

In addition, as shown in FIG. 3, one end of the OCA tape 130 is preferably provided with a handle 131 for allowing a user to easily detach the OCA tape from the liquid crystal panel 140. If foreign matter such as dust or bubbles are formed between the window 110 and the liquid crystal panel 140, rework is required. In this case, when the operator uses the handle 131, the operator may easily remove the OCA tape 130 from the liquid crystal panel 140.

4 is a flowchart illustrating a method of manufacturing a display device of a mobile terminal according to an embodiment of the present invention, and FIGS. 5 to 7 are views illustrating a method of manufacturing a display device of a mobile terminal according to an embodiment of the present invention. Step by step process chart.

First, in step S100 to remove the protective paper attached to the adhesive surface of the OCA tape 130. Here, as the OCA tape 130, a commercially available product from 3M 3M may be applied.

Next, in step S200, the adhesive surface of the OCA tape 130 and the screen of the liquid crystal panel 140 face each other, and then the OCA tape 130 is pressed with a roller to attach to the liquid crystal panel 140.

As shown in FIG. 5, one side is a soft material (OCA tape 130) and the other is a hard material (liquid crystal panel 140). It becomes paper.

Next, as shown in FIG. 6, in step S300, the UV glue liquid is discharged onto the other surface of the OCA tape 130.

Next, as shown in FIG. 7, in step S400, the UV glue liquid is spread by the self-weight of the window 110 by stacking the window 110 on the other side of the OCA tape 130. As the UV glue solution spreads, the UV glue layer 120 is naturally formed.

Then, in step S500 it is possible to easily attach the window 110 to the OCA tape 130 by irradiating ultraviolet light to cure the UV glue liquid.

Unlike the display device manufacturing method according to the present invention as described above, after the UV glue liquid is directly discharged on the screen of the liquid crystal panel 140, the window 110 may be laminated. However, according to such a method, UV glue solution may penetrate into the liquid crystal panel 140. If so, there is a problem that the expensive liquid crystal panel is not reused when rework is required due to foreign matter or bubbles, and thus is discarded. Therefore, such a method is not preferable because it is highly unlikely to reuse the liquid crystal panel.

On the other hand, if the OCA tape 130 is a double-sided tape coated with adhesive on both sides, unlike the display device manufacturing method according to the present invention as described above, the OCA tape 130 to the window 110 without discharging the UV glue liquid It can also be glued directly to it. However, according to such a method, when the window 110 is not bent and is a hard glass material, it is not easy to stack two materials (window and a liquid crystal panel) up and down without bubble generation. Therefore, this method is also undesirable because it is not easy to laminate the two hard materials.

As a result, the display device manufacturing method of the portable terminal according to an embodiment of the present invention will be the most preferable method that can satisfy both the reusability of the liquid crystal panel and the ease of the lamination process.

8 is a photograph for comparing contrast ratios between a conventional display device and a display device of the present invention. In the screen of the mobile terminal shown in FIG. 8, an air layer is formed on the left side, and an OCA tape is attached to the screen to prevent the air layer on the right side.

As shown in Fig. 8, it can be seen that the right part is clearly seen. In other words, the left part of the screen is relatively blurry because the contrast ratio is lower than the right part. In other words, the black color displayed in the left part is gray to the user's eyes.

The present applicant has obtained the results as shown in Table 1 through a comparative experiment between the conventional display device (air layer type) and the display device (OCA type) of the present invention.
Air layer type

OCA type Brightness of black
(cd / m 2 ) Brightness of white
(cd / m 2 )
Contrast Brightness of black
(cd / m 2 ) Brightness of white
(cd / m 2 )
Contrast

Lighting diagram
360 lx


6.268



265.6

42.4

0.980


279.5

285.2

Lighting diagram
2000 lx


11.70

276.2

23.6

2.177

305.0

140.1

The air layer type is 42.4 when using a light source (LED) with an illuminance of 360 lux, while the OCA type is 285.2, and the air layer type is 23.6 when using a light source with an illuminance of 2000 lux. It can be seen that the OCA type is 140.1. That is, it can be seen that the display device of the portable terminal according to the present invention has a much higher image quality than the conventional one.

Furthermore, looking at the experimental value of Table 1, it can be seen that the OCA type has a slightly higher brightness of white than the air layer type.

The display device and the method of manufacturing the portable terminal of the present invention are not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea of the present invention.

1 is a cross-sectional view of a display device of a conventional portable terminal.

2 is a cross-sectional view of a display device of a mobile terminal according to an embodiment of the present invention, and FIG. 3 is a plan view of the optical transparent adhesive tape shown in FIG. 2.

4 is a flowchart illustrating a method of manufacturing a display device of a mobile terminal according to an embodiment of the present invention, and FIGS. 5 to 7 are views illustrating a method of manufacturing a display device of a mobile terminal according to an embodiment of the present invention. Step by step process chart.

8 is a photograph for comparing contrast ratios between a conventional display device and a display device of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

100: display device of the mobile terminal

110: Windows 120: UV glue layer

130: OCA tape 131: handle

140: liquid crystal panel

Claims (3)

Liquid crystal panels; A window for protecting the liquid crystal panel; An optically clear adhesive tape adhered to the screen of the liquid crystal panel; And And a UV glue layer attaching the window to the optically transparent adhesive tape. The method of claim 1, And a handle formed at one end of the optical transparent adhesive tape to allow a user to detach the optical transparent adhesive tape from the liquid crystal panel. Removing the protective paper attached to the adhesive side of the optical transparent adhesive tape; Facing the adhesive surface of the optical transparent adhesive tape and the screen of the liquid crystal panel, and then attaching the optical transparent adhesive tape to the liquid crystal panel using a roller; After the attaching step, discharging the UV glue liquid to the other side of the optically transparent adhesive tape; After the discharging step, by laminating a window on the other side of the optically transparent adhesive tape to spread the UV glue liquid by the weight of the window; And And attaching the window to the optically transparent adhesive tape by irradiating ultraviolet light to cure the UV glue liquid after the UV glue liquid is spread.
KR1020090007939A 2009-02-02 2009-02-02 Display device and its manufacturing method KR20100088823A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020090007939A KR20100088823A (en) 2009-02-02 2009-02-02 Display device and its manufacturing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020090007939A KR20100088823A (en) 2009-02-02 2009-02-02 Display device and its manufacturing method

Publications (1)

Publication Number Publication Date
KR20100088823A true KR20100088823A (en) 2010-08-11

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103270448A (en) * 2010-12-21 2013-08-28 3M创新有限公司 Articles having optical adhesives and method of making same
CN104985885A (en) * 2015-07-17 2015-10-21 高创(苏州)电子有限公司 Display apparatus load-bearing part pasting structure and display apparatus
US9908314B2 (en) 2015-01-20 2018-03-06 Samsung Display Co., Ltd. Lamination apparatus for flexible display and lamination method using the same
CN110738939A (en) * 2019-10-31 2020-01-31 维沃移动通信有限公司 Electronic device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103270448A (en) * 2010-12-21 2013-08-28 3M创新有限公司 Articles having optical adhesives and method of making same
CN103270448B (en) * 2010-12-21 2016-10-19 3M创新有限公司 There is goods and the manufacture method thereof of optical adhesive
US9908314B2 (en) 2015-01-20 2018-03-06 Samsung Display Co., Ltd. Lamination apparatus for flexible display and lamination method using the same
CN104985885A (en) * 2015-07-17 2015-10-21 高创(苏州)电子有限公司 Display apparatus load-bearing part pasting structure and display apparatus
CN110738939A (en) * 2019-10-31 2020-01-31 维沃移动通信有限公司 Electronic device

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E601 Decision to refuse application