WO2021154057A1 - Verre ultra-mince pour la protection de la surface d'un écran flexible - Google Patents

Verre ultra-mince pour la protection de la surface d'un écran flexible Download PDF

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Publication number
WO2021154057A1
WO2021154057A1 PCT/KR2021/001277 KR2021001277W WO2021154057A1 WO 2021154057 A1 WO2021154057 A1 WO 2021154057A1 KR 2021001277 W KR2021001277 W KR 2021001277W WO 2021154057 A1 WO2021154057 A1 WO 2021154057A1
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WIPO (PCT)
Prior art keywords
ultra
thin glass
layer
flexible display
thickness
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PCT/KR2021/001277
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English (en)
Korean (ko)
Inventor
이창훈
Original Assignee
씨엠원글로벌 주식회사
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Priority claimed from KR1020200048050A external-priority patent/KR20210097589A/ko
Application filed by 씨엠원글로벌 주식회사 filed Critical 씨엠원글로벌 주식회사
Publication of WO2021154057A1 publication Critical patent/WO2021154057A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B25/00—Annealing glass products
    • C03B25/02—Annealing glass products in a discontinuous way
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B27/00—Tempering or quenching glass products
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements

Definitions

  • the present invention relates to an ultra-thin glass that protects the surface of a flexible display, and chemically polishes a relatively thin glass of about 70-400 ⁇ m produced for smartphones to have a thickness of 15-70 ⁇ m. It relates to an ultra-thin glass that protects the surface of a flexible display to be made of a protective glass that protects the flexible display after being made of thin glass, UTG) and then subjected to heat treatment to strengthen the ultra-thin glass.
  • the display cover glass consists of tempered glass and a printed film bonded to the tempered glass, wherein the printed film is attached to the tempered glass through a glass adhesive layer, and the The printing film forms a printing layer on the edge of the opposite side of the glass adhesive layer by printing, and a printing release paper is attached to the upper surface of the printing layer.
  • It provides a display cover glass, characterized in that it forms a screen projection area to cut and remove the inner edge of the print layer, and is formed of a print release paper adhered by a print adhesive layer on the upper surface of the print layer.
  • Cited Document 1 Republic of Korea Patent No. 10-1557307, registration date (September 25, 2015)
  • Cited Document 2 Korea Patent Publication No. 10-2015-0131550, publication date (January 25, 2015)
  • An object of the present invention is to provide a glass for protecting the surface of the flexible display in a smart phone employing a flexible display. This is to provide an ultra-thin glass capable of protecting the surface of the flexible display by going through a processing process such as heat treatment to have it as a result.
  • the object is, in the ultra-thin glass to protect the surface of a flexible display equipped with a digitizer used for the display of the in-folding method smart phone, the thickness of the ultra-thin glass is 15 ⁇ 70 ⁇ m, the ultra-thin glass is achieved by strengthening the temperature raising step, the aging step, and the cooling step.
  • the stress of the ultra-thin glass is characterized in that 400 Mpa ⁇ 800 Mpa, the elastic limit of the ultra-thin glass is 1.5% to 5%.
  • the thickness of the coating to be coated to strengthen the surface of the ultra-thin glass is the thickness of the coating to be coated to strengthen the surface of the ultra-thin glass.
  • the cooling rate is from 7.5°C per minute to 25°C per minute.
  • an input device unit is provided between the flexible display unit and the ultra-thin glass, and the input unit unit is provided with a touch panel layer and a digitizer layer, and a touch panel layer and a touch panel layer inside the input unit unit When the digitizer layer is provided, the touch panel layer is positioned above the digitizer layer.
  • the display unit includes a TFT layer and an encaps layer
  • the touch panel layer includes a touch panel electrode layer 52c
  • the digitizer layer includes a digitizer electrode 52a layer
  • the touch panel electrode layer When the inner insulating layer 52b is present between the layer 52c and the digitizer electrode 52a, the thickness of the inner insulating layer 52b is smaller than the thickness of the encap.
  • a camera hole through which light can pass is provided in a fixed substrate that supports the flexible display to be folded and unfolded, and when an SUS layer or an alloy metal layer is present in the flexible display, the SUS layer or alloy metal layer of light A camera hole through which transmission is possible is provided.
  • the ultra-thin glass having a thickness of 15 to 65 ⁇ m is used to protect the surface of a flexible display equipped with a digitizer used as a smartphone screen, an optimized heat treatment process in which the properties of the ultra-thin glass are improved this will be secured.
  • FIG. 1 is a view of an embodiment showing a method of folding a flexible glass
  • FIG. 2 is a diagram of another embodiment of FIG. 1A .
  • FIG 3 is a view of another embodiment when the ultra-thin glass is folded.
  • FIG. 4 is a diagram of an embodiment showing a heat treatment step.
  • FIG. 5 is a view of an embodiment showing the side processing of the ultra-thin glass.
  • FIG. 6 is a view of an embodiment showing a reliability test method in the folding and unfolding process.
  • FIG. 7 is a view showing an ultra-thin glass having a multilayer structure.
  • FIG. 8 is a diagram of an embodiment showing a practical application example of the present invention.
  • FIG. 9 is a view of an embodiment showing the extent to which the ultra-thin glass is stretched.
  • FIG 10 and 11 are views showing the method of the embodiment of precipitating the ultra-thin glass in the reinforcing solution.
  • FIGS. 12 to 14 are diagrams of an embodiment showing a method in which a digitizer is provided.
  • 15 is a diagram of an embodiment showing a method in which a camera is formed on a flexible display.
  • 16 is a view of an embodiment showing the surface roughness of the ultra-thin glass.
  • 17 and 18 are diagrams of an embodiment showing the thickness condition occupied by the ultra-thin glass in the entire flexible display.
  • 19 is a diagram of an embodiment showing a criterion for adhesive force.
  • 20 to 22 are views showing the digitizer layer and the electrode structure provided in the present invention.
  • FIG. 23 is a diagram of an embodiment showing how a digitizer layer is provided under the TFT layer.
  • FIG. 23 is a diagram of an embodiment showing how a digitizer layer is provided under the TFT layer.
  • 52a digitizer layer 52b: inner insulating layer
  • test projections 10-1, 10-2 first and second second thin glass
  • FIG. 1 is a view of an embodiment showing a method of folding a flexible glass
  • the folding and unfolding operations of the flexible display are performed while the flexible display is relatively fixed to the fixed substrate 20 . will wake up
  • the ultra-thin glass of the present invention which protects the surface of the flexible display applied to the in-folding method, is also fixed to the fixed substrate 20 (a substrate fixed without bending of a metal or plastic material) so that folding and unfolding operations occur. it can only be
  • the value of the gap G between the substrates shown in FIG. 1A is determined according to the radius of curvature of the ultra-thin glass 10 . That is, as shown in FIGS. 1 (B) and 1 (C), the two fixed substrates 20 are rotated and moved to be folded, and the ultra-thin film attached to the two fixed substrates 20 The glass 10 is also folded together.
  • the G value exists because the radius of curvature must exist at least.
  • FIG. 2 is a diagram of another embodiment of FIG. 1 ;
  • FIG. 1 (A) is an embodiment in which the interval between the two fixed substrates 20 is spaced apart by G
  • FIG. 2 is an embodiment in which the two fixed substrates 20 are in contact with each other.
  • the gap G also exists in FIG. 2 .
  • the ultra-thin glass 10 is fixed to the fixed substrate 20 by an adhesive or fixing means, but in the non-fixed area (gap G) shown in FIG. 2, the ultra-thin glass 10 is fixed. It is not fixed to the substrate 20 (or is not adhered), but only in a state of being placed on it.
  • the ultra-thin glass 10 and the fixed substrate 20 are fixed to each other in the region existing within the G value. It is not attached (not glued).
  • FIG 3 is a view of another embodiment when the ultra-thin glass is folded.
  • the ultra-thin glass 10 of the present invention is placed on the display unit 50 to be used.
  • the display unit 50 shown in FIG. 3 of the present invention means a foldable flexible display and an input device (touch panel) provided thereon.
  • the ultra-thin glass 10 and the display unit 50 are also folded together.
  • the R value of the ultra-thin glass 10 developed in the present invention must also be at least 5.0 or 4.6 or less.
  • the fixed substrate 20 can be set as the example of the embodiment of Fig. 2, and in this case, the adhesive is not coated between the display unit 50 and the fixed substrate 20 in the non-fixed area. do.
  • the thickness of the glass sold by companies that produce glass used to protect the surface of the smartphone display is generally about 400 ⁇ m, recently, it is produced and sold to 200 ⁇ m or less or even 70 ⁇ m.
  • the glass having the above thickness does not serve as a glass that protects the surface of the flexible display. Therefore, it is necessary to manufacture the ultra-thin glass 10 having a desired thickness through an additional polishing process.
  • polishing For the polishing process, physical polishing is also used, and although physical polishing is a very difficult and laborious task, it is a technique that can be performed by a company that has been in our processing industry for a long time.
  • a polishing process mainly used to make ultra-thin glass is a method of chemical etching using a hydrofluoric acid solution, which is a process generally used in the prior art. Accordingly, it is possible to make the glass having a thickness of 400 ⁇ m, 200 ⁇ m, or 70 ⁇ m into ultra-thin glass having a desired thickness by a conventional chemical polishing method.
  • the etched and polished ultra-thin glass must be strengthened. .
  • the conventionally generally known strengthening process of ultra-thin glass is a process of precipitating ultra-thin glass processed to a desired thickness in a reinforcing solution, and then performing heat treatment in 5 minutes.
  • sodium nitrate (NaNO 3 ), potassium nitrate (KNO 3 ) are mainly used, and a small amount of silicic acid (H 2 SiO 3 ), etc. is added and used. And, the time for immersing the ultra-thin glass in the reinforcing solution, that is, precipitation, is within 2 to 3 hours.
  • FIG. 4 is a diagram of an embodiment showing a heat treatment step.
  • the heat treatment process is divided into three steps: a temperature increase process, an aging process, and a cooling process. And, since this process is a conventional process, in the present invention, a method of a new temperature condition is found to improve the properties of the ultra-thin glass.
  • the optimized heat treatment conditions were found for 2 hours of heating time, 2 hours of aging at 400 °C, and cooling within 30 minutes.
  • an appropriate R value and an appropriate thickness are determined in advance to manufacture an ultra-thin glass 10 having a suitable thickness, and the manufactured ultra-thin glass can have an appropriate R value.
  • a method of developing process conditions for heat treatment was used.
  • An appropriate thickness of the ultra-thin glass 10 was set to 30 ⁇ m, and an appropriate R value was set to 2.
  • the predetermined value of 30 ⁇ m is a value determined in consideration of the thickness of the protective film used in the flexible display, and the predetermined 2 R value is a commercially available R value of 5, 0 or 4.6, so An appropriate R value was determined.
  • the sold glass having a thickness of 100 ⁇ m or more a polishing process is performed using a hydrofluoric acid solution, and the ultra-thin glass having a thickness of 30 ⁇ m is manufactured by repeatedly performing several times.
  • the optimized heat treatment temperature and aging time conditions are as follows.
  • the temperature increase rate in the temperature raising step is 3.13 °C per minute, and the cooling rate per minute in the cooling stage is 12.5 °C.
  • the environment of the heat-treated paper oven is an environment in which a vacuum or an inert gas is present.
  • the settling time in the fortifying solution is between 2 and 4 hours.
  • the ultra-thin glass was found to be folded without cracking even at a value of 2R.
  • the aging temperature may vary depending on the conditions for n repeated experiments. And the aging temperature is not necessarily limited to the 400 °C, that is, the temperature for one heat treatment may be 450 °C, the second heat treatment temperature may be 390 °C. And from the third time, the heat treatment temperature can be set to 400°C, and can be changed based on 400°C.
  • the precipitation time in the reinforcing solution was longer by about 20 to 30 minutes than the condition of the ultra-thin glass having a thickness of only 65 ⁇ m.
  • the 70 ⁇ m thickness can be seen as the limit thickness for commercialization, and it was determined that there is a problem in commercialization to make it thicker, so that the experiment was carried out only up to a thickness of 70 ⁇ m.
  • the ultra-thin glass thickness of 15 ⁇ m to 70 ⁇ m
  • the above-mentioned R value is was found to be achievable.
  • the temperature increase rate in the temperature increasing step used in the heat treatment process in the previous embodiment of the present invention is 3.13 °C per minute, and the cooling rate per minute in the cooling step is 12.5 °C. And the aging temperature was 2 hours at 400 degreeC.
  • the temperature at which the glass is heat treated is not necessarily limited to 400°C, and the temperature could be achieved from 250°C to 450°C.
  • the aging temperature was 400°C.
  • the cooling time reached from 400°C to 25°C was changed to 40 minutes.
  • the cooling rate was 9.4°C per minute.
  • the temperature raising step, the aging step, and the cooling step are 1 cycle, and the 1 cycle is repeated 7 times.
  • the thickness of 30 ⁇ m It was possible to fold the excitation ultra-thin glass to 2R.
  • the temperature raising step, aging step, and cooling step are 1 cycle, and as a result of repeating the 1 cycle 10 times, the thickness of 30 ⁇ m It was possible to fold the excitation ultra-thin glass to 2R.
  • the temperature rising step, aging step, and cooling step are 1 cycle, and the result of repeating the 1 cycle 4 times is 30 ⁇ m thick. It was possible to fold the excitation ultra-thin glass to 2R.
  • the cooling rate for cooling was appropriate at 7.5°C to 25°C per minute. And it can be expressed as follows.
  • the experiment was conducted under the condition that the cooling rate at which the temperature decreases in the cooling stage floats faster than the temperature increase rate, which is the rate at which the temperature rises in the temperature increasing stage. That is, in the graph of FIG. 4 , “the slope of the curve in which the temperature decreases in the cooling step” is greater than the “slope of the curve in which the temperature increases in the temperature increase step” in the graph of FIG. 4 .
  • slope of A and “slope of B” may be the same, and “slope of A” may be smaller than “slope of B”.
  • FIG. 5 is a view of an embodiment showing the side processing of the ultra-thin glass.
  • Edge processing on the side of the glass will also use a conventional general method. That is, the etching is performed using the hydrofluoric acid solution, but the portion that does not require etching is masked so that the etching is not performed.
  • Patent 1 instead of using only one glass, 10 or 20 ultra-thin glasses are stacked, and then the side part is immersed in hydrofluoric acid solution to be etched.
  • the correlation ratio is important.
  • the value of the distance L is preferably 10 ⁇ m. Therefore, the value of L/T becomes 1/3.
  • the range of the L value is 5 ⁇ m to 15 ⁇ m.
  • the value of the ratio of the T value and the L value is as follows same.
  • the reason for processing the side of the glass is to soften the edge to improve handling, but the reason for processing the side of the ultra-thin glass in the present invention is to prevent cracking of the glass. That is, if the corner of the ultra-thin glass is rounded, it has an effect of preventing breakage when bending or applying an impact to the ultra-thin glass.
  • FIG. 6 is a view of an embodiment showing a reliability test method in the folding and unfolding process.
  • a reliability test may be performed by actually applying the ultra-thin glass of the present invention to a smart phone employing a flexible display, but since it may be difficult in reality, the reliability test may be performed by imitating the structure when applied to a flexible display.
  • FIG. 6 is a diagram of an embodiment showing a reliability test method manufactured by imitating the structure of a folding smartphone that is actually folded and unfolded.
  • test boards 70 that can be folded and unfolded by rotating 180 degrees and 0 degrees are provided, and on the test board, the ultra-thin glass 10 is mounted as in the embodiment of FIG. 1 (or the embodiment of FIG. 2 ) do.
  • the test protrusion 71 is mounted on the boundary of the test substrate 70 .
  • the test protrusion 71 is a protrusion protruding to a certain height, therefore, due to the test protrusion 71 .
  • the ultra-thin glass 10 is folded with a predetermined value of curvature.
  • the height value of the test protrusion 71 is adjustable,
  • the presence of the second protrusion 72 prevents the folded ultra-thin glass 10 from contacting each other.
  • the second protrusion 72 is formed to be higher than the ultra-thin glass 10
  • the first protrusion 71 is formed to be higher than the second protrusion.
  • the ultra-thin glass 10 of the present invention is mounted (attached with a thermoplastic resin) to the device of the embodiment of FIG. 6 . Therefore, when heat is applied, the ultra-thin glass 10 can be easily separated from the test substrate 70 . ), and by connecting the electric device to the test board 70 and repeating folding and unfolding operations, it is possible to determine reliability.
  • the time taken to fold and unfold the unfolded ultra-thin glass 10 was set to 1.5 seconds, and a reliability test was conducted.
  • the experiment of the present invention is to fold continuously for 20,000, and thus, in the folding process, in a state in which the vibration energy generated when folding before is not zero, that is, in a state in which the vibration energy remaining when previously folded exists.
  • the vibrational energy that is generated will be generated again. Therefore, it can be said that the continuous test of 20,000 times shows reliability when folded 40,000 times (more than twice as much as 20,000 times) in actual use. Of course, continuous numerical experiments will be necessary for this.
  • the stress value of the glass that protects the conventional smartphone display was requested by the set company at 650 Mpa and 800 Mpa, respectively.
  • the stress value of the ultra-thin glass that protects the flexible display cannot be as high as the stress value that protects the conventional smartphone display.
  • the stress value of the ultra-thin glass 10 for protecting the flexible display is preferably 250 Mpa or more.
  • the maximum value can be said to be 800 Mpa because it does not need to be greater than the stress value that protects the conventional smartphone display screen.
  • the stress value of the ultra-thin glass presented in the present invention is 450 Mpa to 800 Mpa.
  • a measuring device manufactured by RIHARA Surface Stress Merer of Japan is generally used, and the same is true in the present invention.
  • the DOL value is the strengthening depth, and the longer the immersion time in the strengthening solution, the thicker the DOL layer. In the present invention, it took time to settle in the strengthening solution within 2 to 3 hours.
  • the DOL value was also measured.
  • the measured values for each thickness were as follows.
  • the range of the DOL value in the present invention is 5 to 17 when the range of the ultra-thin glass is 15 ⁇ m to 65 ⁇ m.
  • Glass generally shows a low elastic limit of less than 0.5%, but in the case of a plastic film, it shows an elastic limit 10 times that of glass at 5%. Therefore, even if the elastic limit of the ultra-thin glass 10 manufactured in the present invention is not as high as the plastic film, it should be at a level exceeding the range of the elastic limit of the conventional glass.
  • the heat treatment process used in the previous embodiment of the present invention was performed more than 5 times. That is, as a result of repeated experiments up to 10 times, the elastic limit was increased to 2.5%.
  • the elastic limit value of the ultra-thin glass protecting the flexible display surface is from 1.5% to 5%.
  • the glass that protects the display surface in the smartphone is exposed to the outside as it is, the glass should be coated on the surface.
  • a protective film may be present to protect consumers when the ultra-thin glass ruptures, AF coating, etc. may be applied, and a reinforcing coating may also be applied.
  • the level of the reinforced coating thickness of the conventional smartphone was 20 ⁇ m to 45 ⁇ m.
  • the thickness of the ultra-thin glass protecting the flexible display is thin, the thickness of the reinforcing coating cannot be used as it is.
  • the thickness of the reinforcing coating was coated at a level of 1 ⁇ m, and the coating was performed in 2 ⁇ m steps from 2 ⁇ m to 16 ⁇ m, and then it was judged whether cracks occurred when folded at the 2 R level.
  • the thickness of the reinforcing coating was from 1 ⁇ m to 15 ⁇ m, an ultra-thin glass that protects the surface of the flexible display was possible.
  • the range of the thickness for applying the reinforcing coating is as follows.
  • the coating may be a film attached to the ultra-thin glass. That is, various types of transparent films may be used, and for example, a CPI film may also be used.
  • the coating may be present on the other functional layer. Accordingly, in this case, the coating is a coating positioned on the top of the flexible display.
  • an anti-fingerprint function there is not only a hard coating on the top of the ultra-thin glass, that is, an anti-fingerprint function may exist. Also, a PET layer may be present between the hard coating layer and the ultra-thin glass layer, and an optical adhesive material (OCA) layer used to minimize light loss or reflection may also be present.
  • OCA optical adhesive material
  • FIG. 7 is a view showing an ultra-thin glass having a multilayer structure.
  • the first ultra-thin glass 10-1 and the second ultra-thin glass 10-2 are provided, and the first ultra-thin glass 10-1 and the second ultra-thin glass 10 are provided.
  • the adhesive layer 15 is formed between -2).
  • another resin film layer may be present in the adhesive layer.
  • the ultra-thin glass 10 (10-1) (10-2) of the present invention is also folded. Accordingly, in the ultra-thin glass 10, 10-1, and 10-2 of the present invention, there are a folded region (non-fixed region) and an unfolded region (fixed region).
  • the folded area (non-fixed area) is a section marked with G shown in the embodiment of FIG. 1 .
  • the adhesive must also show a difference in adhesive strength in the folded area (non-fixed area) and the non-folded area (fixed area). That is, it can be expressed as
  • the “adhesive force of the adhesive in the folded region (non-fixed region)” is weaker than the “adhesive force of the adhesive in the unfolded region (fixed region)”.
  • FIG. 8 is a diagram of an embodiment showing a practical application example of the present invention.
  • FIG. 9 is a view of an embodiment showing the extent to which the ultra-thin glass is stretched.
  • the length of the ultra-thin glass on the outer surface is compared to the distance between the inner surface of the ultra-thin glass and the outer ultra-thin glass. should be increased by 4% compared to the length of the ultra-thin glass present on the inner surface,
  • the The length should be increased by 2.6% over the length of the ultra-thin glass present on the inner surface
  • the outer surface should be increased by 2.6% to 4% than the inner surface as it is folded.
  • FIG 10 and 11 are views showing the method of the embodiment of precipitating the ultra-thin glass in the reinforcing solution.
  • FIG. 11 is a view showing the depth in which the ultra-thin glass 10 is immersed in the strengthening liquid. 1 to 3 of the present invention, there is a distance G of the area in which the ultra-thin glass is folded. That is, only the region (region G in FIGS. 1 to 3 ) of the ultra-thin glass 10 positioned at the foldable portion of the flexible display may be strengthened.
  • the G region may be immersed in the reinforcing solution 90 . That is, it is not necessary that all of the first film glass 10 be immersed in the reinforcing solution 90 .
  • G The length of the region in which the ultra-thin film glass 10 is folded.
  • the stress values or DOL values of the A zone and the B zone, which are side edges of the ultra-thin glass 10 based on the folded center, are different from each other.
  • a commercialized smart phone employing a flexible display cannot employ a digitizer function. This is because, in order to use the digitizer, a pen must be used, and as the pen is used, the surface of the flexible display made of the resin film is worn.
  • the smartphone using the ultra-thin glass 10 of the present invention does not wear the flexible display surface even if the digitizer function is employed.
  • FIGS. 12 to 14 are diagrams of an embodiment showing a method of employing a digitizer in a flexible display.
  • FIGS. 12 to 14 are diagrams of an embodiment showing a method in which a digitizer is provided.
  • FIG. 12 is a diagram of an embodiment showing a cross-sectional structure of a commercially available flexible display. That is, the two fixed substrates 20-1 and 20-2 support the foldable and unfoldable flexible display, the base film 25 exists under the flexible display unit 50, and the input device is on the flexible display.
  • the part 52 is present, and the ultra-thin glass 10 of the present invention is present on the input device part 52 .
  • FIG. 13 is a diagram showing the layered structure three-dimensionally by separating it.
  • the input device unit 52 includes a touch panel function.
  • the touch panel layer is provided on the top of the flexible display unit 50 conventionally, it is provided as a coating layer instead of as a separate layer.
  • the touch panel layer includes a conductive film layer and an insulating resin film layer.
  • the TFT layer 50a includes a display pixel connection electrode wiring, an OLED layer, and the like.
  • an encap 50b layer is formed on the TFT layer 50a.
  • the encaps 50b layer protects the TFT layer 50a over the TFT layer 50a. Therefore, an insulating function should be provided to the TFT layer by coating with an organic layer, but the breathability (property through which moisture or oxygen, etc.) of the organic layer should be blocked by coating the inorganic layer.
  • SiN X is generally used as an inorganic layer.
  • a multilayer structure may be formed in the order of organic coating, inorganic coating, and organic coating.
  • the input device 52 is formed on the encaps 50b layer. 14 , the input device 52 includes a digitizer electrode layer 52a, an inner insulating layer 52b, a touch panel electrode layer 52c, and an outer insulating layer 52d.
  • the digitizer electrode layer 52a and the internal insulating layer 52b are further formed, it is formed as a coating layer instead of a separate layer.
  • the thickness of the inner insulating layer 52b serving to insulate the upper digitizer electrode layer 52a and the touch panel electrode layer 52c is made thinner than that of the encaps layer 50b, and the thickness is also set to within 30 ⁇ m.
  • the inner insulating layer 52b only one layer from an organic layer and an inorganic layer may be used. This is because the insulating function is sufficient.
  • an external insulating layer 52d is formed on the touch panel electrode layer 52c.
  • the outer insulating layer 52d is formed to be thicker than the inner insulating layer 52b because reliability is also required.
  • 15 is a diagram of an embodiment showing a method in which a camera is formed on a flexible display.
  • the weights of the multiple layers present on both sides of the TFT layer 50a as seen in the structures of FIGS. 12 to 14 should be balanced with each other. Accordingly, SUS is used as the base film layer.
  • the glass weighs more than the resin and the ultra-thin glass 10 is used in the present invention, a material heavier than the resin should be used on the opposite side of the TFT layer 50a, and the material that can be used is an alloy metal or It becomes SUS.
  • a dummy layer (in the previous technical description of the present invention, since the dummy layer is a prior art, an additional amplification of the dummy layer is omitted.) is added and used to the base film 25, and SUS is used as the dummy layer and alloy metals are used.
  • a camera hole 20a that allows light to pass through must be formed in the fixed substrates 20-1 and 20-2, and SUS (or A camera hole 26a for allowing light to pass through the alloy metal 26 should also be formed.
  • a transparent resin is filled inside the camera holes 20a and 26a.
  • the camera holes 20a and 26a mean that the cutout is formed so that light is transmitted through the camera (image element), and does not necessarily mean the shape of the hole (circular sphere).
  • 16 is a view of an embodiment showing the surface roughness of the ultra-thin glass.
  • the surface roughness can be measured using a normal roughness meter or a non-contact type roughness meter.
  • the ball drop test is an experiment in which a 1 g iron ball is dropped from a height of 50 cm.
  • the ball drop test is passed when the height of RL is within 17% of the height of T when T is 60 ⁇ m.
  • the meaning of the highest mountain height means the highest value in the normal distribution value, that is, when the x-axis is the frequency of mountains and the y-axis is the height of the mountain in a normal xy coordinate, y
  • the largest value on the axis is the height of the largest mountain illustrated in Fig. 15 of the present invention.
  • the frequency of the mountains means the number. For example, 5 ⁇ m may have 10 heights, and 6 ⁇ m may have 8 mountains in 1 cm square.
  • 17 and 18 are diagrams of an embodiment showing the thickness condition occupied by the ultra-thin glass in the entire flexible display.
  • the TFT layer 50a present in the flexible display is preferably located at the center of gravity in the flexible display.
  • a base film 25 layer and a dummy film 27 exist under the TFT layer 50a, and the encap 50b, the input device unit 52, and the polarization layer are on the TFT layer. (28), the ultra-thin glass 10 is present.
  • the TFT 50a includes an electrode wiring and an OLED layer
  • the base film 25 layer is a coating film on which the TFT layer is mounted, and is a resin material or inorganic material that also functions to planarize the surface
  • the dummy film 27 is a thickness control. It is a film that is additionally attached, such as, and in some cases, the base film 25 and the dummy film 27 may be integrated.
  • the encap (50b) layer is coated with an organic layer to provide an insulating function to the TFT layer, but by coating an inorganic layer, the air permeability (property through which moisture or oxygen, etc.)
  • the inorganic layer "SiN X " is generally used.
  • a multilayer structure may be formed in the order of organic coating, inorganic coating, and organic coating.
  • the input device unit 52 is a layer that functions as a touch panel or a digitizer, and thus, the input device unit 52 includes a plurality of layers, such as an electrode layer and an insulating layer.
  • the polarization layer 28 is a layer having a normal polarization function, and a plurality of layers are included here as well.
  • the ultra-thin glass 10 of the present invention is coated on the outermost part of the flexible display.
  • the ultra-thin glass 10 may have a coating layer or a film preventing scattering of the ultra-thin glass 10 .
  • a plurality of layers (encap 50b, input device 52, polarization layer 28, ultra-thin glass 10, etc.) existing on the TFT layer are included, and on the TFT layer 52a in the flexible display. It means a plurality of layers that exist.)
  • the thickness is called "UL"
  • the thickness of the "LL” should be greater than the thickness of the "UL”.
  • the basis for "the thickness of the LL must be greater than the thickness of the UL" is as follows.
  • the TFT layer 52a in the flexible display must exist at the center of gravity.
  • the weight of the "UL layer” and the weight of the "LL layer” must be the same or similar within the error range.
  • the density of tempered glass is 2.54 (2.76 for other types)), and the general density of resin is 0.915 to 0.925, so the density of tempered glass is 2.76 times or 3 times higher than that of resin on average. Therefore, "the thickness of the LL must be greater than the thickness of the UL" is established.
  • the thickness of the ultra-thin glass 10 is T in the thickness of UL,
  • the "thickness of LL” may be 166.7 mu m.
  • the thickness of the ultra-thin glass is T
  • a value of "UL - T x 2/3" becomes an appropriate thickness of "LL".
  • the error range must be considered, and when this point is taken into account, "(UL - T x 2/3") ⁇ 33.3 %" will be the thickness range of "LL".
  • K1 density of ultra-thin glass/density of resin
  • FIG. 18 is a diagram of an embodiment in which SUS is used as a dummy film.
  • the density of SUS is 7.75 to 7.93.
  • the average density of SUS is 7,84, and the average density of ultra-thin glass is 2.65. Therefore, the weight of SUS becomes heavier than that of ultra-thin glass (average density of resin 0.92).
  • the thickness of the SUS (or metal alloy or metal) layer 26 may be made thinner than the thickness of the ultra-thin film. This is because the density of SUS (or metal alloy or metal) is lower than that of super-film glass, and it is natural that the high-density layer is made to be low in order to balance the weight.
  • the weight of SUS is heavier than UTG, and consequently, the thickness of UL becomes thicker than that of LL.” , and the value obtained by subtracting the thickness of SUS from LL is called LL1, and the thickness of the SUS layer can be called S. Then, it also means that the value of “T-S” may be larger than the value of “UL1 - LL1”.
  • the density of SUS is 8.52 times greater than that of resin, and the density of ultra-thin glass is 2.88 times greater than that of resin.
  • UL - T + TX K1 may be greater than "LL - S + SX K2" within 33.3 %, and conversely, "LL - S + SX K2" may be greater than "UL - T + TX K1" within 33.3 %.
  • the plurality of layers included in the LL and UL shown in FIGS. 17 and 18 are only representative layers necessary for the description of the present invention. Therefore, it goes without saying that, in addition to the layers shown in Figs. 17 and 18, more functional layers may be included, and even with several additional layers that function (layers not shown in Figs. 17 and 18, but which may be present), TFT If it is above the layer, it is included in the UL, and if it is below the TFT layer, it is included in the LL.
  • PSA Pressure Sensitive Adhesive Application
  • transparent polyimide PI
  • cushion Film layer
  • PET Optical axis Control Film
  • black matrix layer etc.
  • 19 is a diagram of an embodiment showing a criterion for adhesive force.
  • FIG. 19(A) is a view showing a state in which the ultra-thin glass 10 and the polarizing layer 28 or the input device unit 52 are adhered with an adhesive
  • FIG. 19(B) is a base film 25 and It is a view showing a state in which the dummy film 27 (or it may be a SUS layer) is adhered with an adhesive.
  • the folding radius is small at the top and large at the bottom as seen in FIG. 18 .
  • the pressure-sensitive adhesive used in (A) of FIG. 19 has a small turning radius, and the pressure-sensitive adhesive used in FIG. 19(B) has a large turning radius. Therefore, the adhesive force of the pressure-sensitive adhesive used in FIG. 19(B) should be smaller than that of the pressure-sensitive adhesive used in FIG. 19(A).
  • the pressure-sensitive adhesive a silicone pressure-sensitive adhesive, a cold release type pressure-sensitive adhesive, a UV pressure-sensitive adhesive, etc. are used, and the antistatic agent is added in a small amount.
  • the silicone pressure-sensitive adhesive includes an alkenyl group-containing polydiorganosiloxane, a hydrocarbon group, a polyorganosiloxane copolymer, a polyorganosiloxane, a platinum group catalyst compound, and an antistatic agent.
  • the platinum group catalyst compound is selected from those consisting of platinum black, chloroplatinic acid, chloroplatinic acid-olefin complex, chloroplatinic acid-alcohol coordination compound, rhodium, and rhodium-olefin complex;
  • the UV adhesive includes an elastomer, an ultraviolet crosslinking resin, an adhesion imparting agent, a polymerization initiator, and a polymerization inhibitor.
  • the antistatic agent consists of an inorganic salt consisting of a metal cation and an anion, or an onium cation and an anion.
  • 20 to 22 are views showing the digitizer layer and the electrode structure provided in the present invention.
  • FIG. 20 is a detailed view of the digitizer layer 52a shown in FIG. 14 .
  • an upper substrate 52a-1, an upper electrode 52a-3 and a lower substrate 52a-2 provided on the upper substrate 52a-1, and the lower substrate 52a-2 are provided.
  • 21 is a diagram illustrating an electrode structure, and is a diagram illustrating shapes of electrodes provided on an upper substrate and a lower substrate, respectively.
  • the upper substrate may be the lower substrate depending on the electrode design method, and the upper substrate may be the lower substrate.
  • the pattern electrode of the digitizer is provided as if a plurality of electrode lines 17b of the embodiment of FIG. 21 were formed, and each electrode line 17b is made using a printing method, and for printing, silver (Ag) use paste,
  • the electrode line 17b is made thin so as not to be observed by the eye.
  • the thickness of the electrode line 17b does not exceed 10 ⁇ m.
  • the interval between the electrode line (17b) and the electrode line (17b) is suitable within 1mm to 10mm,
  • the content of silver (Ag) in the silver (Ag) paste is 70 to 90% by weight, and an epoxy-based resin or a thermosetting resin is used as the resin in the silver (Ag) paste.
  • a lower electrode 52a-4 is formed on the lower substrate 52a-2 by a printing method
  • an insulating film 52a-5 is formed on the lower electrode 52a-4 by a coating method
  • An upper electrode 52a-3 is formed on the insulating film 52a-5 by a printing method
  • an upper substrate 52a-1 is formed on the upper electrode 52a-3 by a coating method.
  • FIG. 21 the active area (digitizer sensor area) 17d and the driving connection unit 17c connected to the digitizer driving unit are also shown.
  • 22 is a method of another embodiment in which an electrode layer is positioned.
  • an electrode layer In a flexible display, there are a plurality of layers, so it may be important to use a method to reduce the number of layers.
  • the digitizer layer 52a has a structure in which the upper substrate 52a-1 and the lower substrate 52a-1 are omitted. Accordingly, the lower electrode 52a-4 is formed on the encap 50b (refer to the description of FIGS. 14 and 14) by a printing method, and the insulating film 52a-5 is formed by a coating method on the lower electrode 52a-4. ) is formed, and an internal insulating layer 52b (refer to the description of FIGS. 14 and 14) is formed on the insulating film 52a-5 by printing again.
  • a touch electrode (an electrode present in the touch layer described with reference to FIG. 14) is formed on the inner insulating layer 52b.
  • FIG. 23 is a diagram of an embodiment showing how a digitizer layer is provided under the TFT layer.
  • Finding a method for increasing the transmittance of a portable display device is also one of the important factors. Accordingly, if the digitizer layer is positioned under the TFT layer 50a that emits light, it is possible to compensate for the disadvantage that the transmittance is reduced by the digitizer layer 52a.
  • a lower electrode 52a-4 is formed on the encap 50b, an insulating film 52a-5 is formed on the lower electrode 52a-4 by a coating method, and again on the insulating film 52a-5.
  • An upper electrode 52a-3 is formed by a printing method, and an intermediate insulating film 52e is formed on the upper electrode 52a-3 by a coating method.
  • a conventional insulating film used for manufacturing a flexible display is used as the insulating film, that is, the material of the insulating film is listed below.
  • the insulating film may be, for example, an organic insulating film.
  • organic insulating films include acrylic polymers such as polymethyl methacrylate (PMMA), polystyrene (PS), polymer derivatives having phenol groups, imide polymers, arylether polymers, amide polymers, fluorine polymers, and p-xylene polymers. Polymers, vinyl alcohol-based polymers, and mixtures thereof may be included.
  • It may be formed of an acrylic organic material or BCB (Benzocyclobutene).
  • It may be formed of an inorganic material such as silicon oxide, silicon nitride or silicon oxynitride.
  • It may be formed in a single layer or in multiple layers of a material such as silicon oxide or silicon nitride.
  • PET polyethylen terephthalate
  • PEN polyethylen naphthalate
  • polyimide polyimide
  • the transmittance and thickness of the insulating film may be specified.
  • an insulating film 52a-5 is formed between the upper electrode 52a-3 and the lower electrode 52a-4, and the transmittance of the insulating film should be 90% or more, and 97% is sufficient. It is more preferable to maintain more than 98% in
  • the thickness of the insulating layer 52a - 5 should be determined in consideration of the entire flexible display, and a range of 0.1 ⁇ m to 5 ⁇ m or 10 ⁇ m is suitable. In addition, the thickness of the insulating layer 52a - 5 should be smaller than the thickness of the encap 50b.
  • the transmittance and thickness of the upper substrate 52a-1 and the lower substrate 52a-2 in the digitizer layer 52a are manufactured according to the transmittance and thickness of the insulating layer 52a-5. That is, the transmittances of the upper substrate 52a-1 and the lower substrate 52a-2 should be 90% or more, and it is more preferable to maintain 97% to 98% or more to be sufficient.
  • the thickness of the upper substrate 52a-1 and the lower substrate 52a-2 is preferably 0.1 ⁇ m to 5 ⁇ m or 10 ⁇ m.
  • the thickness of the insulating layer 52a - 5 should be smaller than the thickness of the encap 50b.
  • the flexible display 50' is wound on two rolls 100-1 and 100-2.
  • the display 50' shown in FIGS. 24 to 26 means a flexible display 50' to which all films having various functions and ultra-thin glass are integrally attached.
  • the first roll 100-1 and the second roll 100-2 form a pair, and the flexible display 50' wound on the first roll 100-1 is formed by the second roll 100-2. ), and the flexible display 50 ′ wound on the second roll 100 - 2 may be transferred to the first roll 100 - 1 .
  • the rolls 100-1 and 100-2 may have a cylindrical shape and may wind the flexible display 50', which is a film having a constant width.
  • the distance between the first roll 100-1 and the second roll 100-2 is made close to each other, and the first and second rolls are flexible.
  • the display 50' may be wound.
  • the flexible display 50' may be wound or unwound on both the first roll 100-1 and the second roll 100-2, and the first roll 100-1 and the first roll 100-1 may be unwound. ) and the second roll 100 - 2 , the flexible display 50 ′ may be wound or unwound on only one roll.
  • 26 is a view illustrating a method in which the flexible display 50' is wound on at least one of the first roll 100-1 and the second roll 100-2.
  • the diameters of the first and second rolls 100-1 and 100-2 are referred to as D2, and the flexible display 50' is maximally wound (the first and second rolls 100-1 and 100-2). 2)
  • the diameter of the state in which the distance between them is closest) is referred to as D1 (the value of the sum of the thicknesses of the multiple layers of the flexible display wound up to the maximum and the diameters of the rolls 100-1 and 100-2), and the flexible display Let the thickness of (50') be T.
  • FIG. 27 is a view showing a plan view of a flexible display wound on a roll.
  • the left view of FIG. 27 is a view of a state in which the distance between the first roll and the second roll 100-1 and 100-2 is the closest, and the right view of FIG. 27 is the first roll and the second roll 100- 1) The distance between (100-2) is the farthest.
  • L1 be the length of the width of the flexible display unfolded when the two rolls 100-1 and 100-2 are closest to each other, and the flexible display unfolded when the two rolls 100-1 and 100-2 are most distant from each other is referred to as L1.
  • the length of the width of the display may be referred to as L2.
  • L2 - L1 2 ⁇ (D/2) + 2 ⁇ (D/2 + T) + 2 ⁇ (D/2 + 2T) + - - - + 2 ⁇ (D/2 + nT)
  • T is the flexible display thickness
  • the value of the L1 and L2 should be taken into account of the actual width of the smartphone, and when the length of the width of the smartphone is large, it may be 100 mm, and thus the value of L2 may be set to 200 mm, and The value of L1 can be set to 20mm, which is 1/5 of the width of the smartphone. Therefore, the maximum value of L2 - L1 is 180m.
  • the minimum value of L2 - L1 is increased by two times the width of the smartphone by the rollable effect, and the width of the smartphone is also 5 cm instead of 10 cm. Assuming that the size of is only doubled, the minimum value of L2 - L1 is 50 mm,
  • the R value of the ultra-thin glass 10 used in the present invention is 1.5, and in consideration of the realistic structure, the value of D2 may be 2 mm. Of course, considering the thickness of the smartphone device, the D2 value can be set to 20mm.
  • n is the range of the number of times the flexible display 50' is wound around the first roll 100-1 or the second roll 100-2.
  • the thickness of the rolls 100-1 and 100-2 can be actually used from 2 mm to 20 mm, and by reflecting the thickness of the rolls 100-1 and 100-2 used, the formula (1) ) (2), the range of n values is obtained.
  • the range of n is obtained by substituting a value of 2 into the equations (1) and (2) above.
  • the thickness of the rolls 100-1 and 100-2 is 20 mm, it means that the value is obtained by substituting a value of 20 into the equations (1) and (2).
  • the number n of the number of times the flexible display 50' is wound around the rolls 100-1 and 100-2 is determined by the diameter values of the rolls 100-1 and 100-2.

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Abstract

La présente invention concerne un verre ultra-mince permettant de protéger la surface d'un écran flexible utilisé pour un écran d'un téléphone intelligent de type pliable, l'épaisseur du verre ultra-mince étant de 15 à 65 µm, et le verre ultra-mince étant amélioré par l'intermédiaire d'une étape d'élévation de température, une étape de vieillissement, et une étape de refroidissement, afin qu'un processus de traitement thermique optimisé pour améliorer les propriétés du verre ultra-mince puisse être assuré afin de protéger la surface d'un écran flexible utilisé comme écran d'un téléphone intelligent en utilisant un verre ultra-mince ayant une épaisseur de 15 à 70 µm.
PCT/KR2021/001277 2020-01-30 2021-02-01 Verre ultra-mince pour la protection de la surface d'un écran flexible WO2021154057A1 (fr)

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KR20200011205 2020-01-30
KR10-2020-0011205 2020-01-30
KR10-2020-0048050 2020-04-21
KR1020200048050A KR20210097589A (ko) 2020-01-30 2020-04-21 플렉서블 디스플레이 표면을 보호하는 초 박막 글라스

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CN115116352A (zh) * 2022-07-27 2022-09-27 京东方科技集团股份有限公司 显示模组固定装置
CN115116352B (zh) * 2022-07-27 2023-11-10 京东方科技集团股份有限公司 显示模组固定装置

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