CN101055321A - High light transmittance ratio touch screen - Google Patents
High light transmittance ratio touch screen Download PDFInfo
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- CN101055321A CN101055321A CNA2006100667862A CN200610066786A CN101055321A CN 101055321 A CN101055321 A CN 101055321A CN A2006100667862 A CNA2006100667862 A CN A2006100667862A CN 200610066786 A CN200610066786 A CN 200610066786A CN 101055321 A CN101055321 A CN 101055321A
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Abstract
The invention discloses a high-transmittance touch screen, including a substrate and at least a multi-layer reflection configuration which is a four-layer structure coated on the front surface of the substrate with designed refractive index of high, low, high and low calculated from the side adjacent to the substrate, wherein the outer layer is a protection layer with protecting function provided with a reflective index laid between 1.3~1.5, a thickness of at least 0.1micrometre, and the hardness accorded with ASTM-D3363 international inspection standard, and due to the design of the protecting layer, the transmittance of the touch screen reaches ASTM-D1003 92% or more, and also strengthens the antiware performance of the surface.
Description
Technical field
The present invention relates to a kind of touch screen with reflection multilayer structure; particularly relate to a kind of with the superficial layer of protective seam (protective layer) as this reflection multilayer structure, to strengthen the capacitance type touch control screen (capacitive touch panel) of anti-wear effect.
Background technology
The antireflective optical coating layer was applied in the products such as building glass, safety goggles in the past, and along with this technology of progress of science and technology is migrated gradually on fields such as semiconductor, CD reading head, LCD and Trackpad.In the design concept of traditional antireflective optical coating layer, the aspect that is coated on the contact substrate has higher refractive index (being H), next face then with this aspect that another has the coating of low-refraction (being L), so the structure of traditional antireflective optical coating layer is to count from the direction that is adjacent to substrate to be followed successively by H, L, H, L.
And No. the 562736th, TaiWan, China patent announcement is (with United States Patent (USP) the 6th, 586, be accomplice No. 101), then propose a kind of with the technology of transparency conducting layer as the superficial layer of antireflective optical coating layer, the antireflective optical coating layer of this case, also have four-layer structure, and the design of the refractive index of each tunic is counted from a side that is adjacent to substrate and is followed successively by L, H, L, H.Because by above-mentioned design, transparency conducting layer is produced on outermost layer, when making electrode, just do not need as prior art, need utilize ultrasonic soldering like this, destroy the top layer exposing the transparency conducting layer of lower floor, thereby can overcome the difficult problem that a large amount of production antireflective optical coating layers are faced.
In sum in the prior art, it all is the difficult problem on the performance of emphasizing transmittance and solution processing procedure, but all do not have especially to propose further solution at the resistance to abrasion of the extexine of antireflective optical coating layer or the lifting that anti electromagnetic wave disturbs the stability of (EMI) or integral light-transmitting rate.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of high light transmittance ratio touch screen; be to be coated with a reflection multilayer structure in the front of substrate; wherein the outermost top layer of this sandwich construction is a protective seam; so high light transmittance ratio touch screen of the present invention except possessing high transmission rate, can also further have wear-resistant characteristic by this protective seam.
Another object of the present invention is to provide a kind of high light transmittance ratio touch screen, is that the reverse side at substrate is coated with another reflection multilayer structure, further reducing reflection and to increase transmittance, and has the function that anti electromagnetic wave disturbs (EMI).
Another purpose of the present invention is to provide a kind of high light transmittance ratio touch screen, be in the reflection multilayer structure of the front/reverse side that is coated on substrate, can set up a layer 5 (the anti-photosphere of dazzling) (anti-glare layer), so that the whole performance of transmittance in visible wavelength range can be more stable.
Based on above-mentioned fundamental purpose, the invention provides a kind of high light transmittance ratio touch screen, comprise that a substrate and is coated on the first reflection coating layer structure of this substrate front side, the optimal way of this layer structure is that refractive index is designed to high and low, high and low four-layer structure (counting from a side that is adjacent to substrate), and this four-layer structure is called the first～four layer.Ground floor is the monoxide layer, has to be higher than 1.5 refractive index; The second layer is the monoxide layer, has the refractive index between 1.3～1.5; The 3rd layer is a transparent conductive layer, has the refractive index between 1.8～2.5, and has the resistance value between 200～10000 ohm/unit area; The 4th layer is a protective seam, has the refractive index between 1.3～1.5, and its thickness is at least 0.1 micron (μ m), and hardness is by the international test stone of the ASTM-D3363 of 9H.
In addition, based on above-mentioned another purpose, the invention provides a kind of high light transmittance ratio touch screen, be that reverse side at substrate is coated with one second reflection coating layer structure, wherein the optimal way of this structure is that its refractive index is designed to high and low, high three-decker (counting from a side that is adjacent to substrate), and this three-decker is called the 8th～ten layer.The 8th layer of refractive index that is equal to ground floor; The 9th layer of refractive index that is equal to the second layer; The tenth layer is equal to the refractive index of ground floor, and has 10～10
5The resistance value of ohm/unit area.
In addition, a kind of high light transmittance ratio touch screen provided by the present invention has under four layers the reflection configuration in substrate front side only, can also by with substrate just/mode of reverse side pickling or acid etching, substrate surface is rough-shape to have an anti-effect of dazzling light thereby make; Also can add particulate (particle) in addition, thereby reach anti-effect of dazzling light at the outermost layer (being protective seam) of above-mentioned four layers of reflection configuration.Can certainly be at the 4th laminar surface, or between the 3rd layer and the 4th layer, form a layer 5 (the anti-photosphere of dazzling) in addition.
In sum, high light transmittance ratio touch screen according to the present invention also has the function that wear-resistant characteristic and anti electromagnetic wave disturb (EMI) except that possessing high transmission rate, and the whole performance of transmittance in visible wavelength range is more stable.
Description of drawings
Fig. 1 is the cut-open view of first preferred embodiment of high light transmittance ratio touch screen of the present invention.
Fig. 2-1～Fig. 2-the 5th, the cut-open view of second preferred embodiment of high light transmittance ratio touch screen of the present invention.
Fig. 3 is the cut-open view of a state of the 3rd preferred embodiment of high light transmittance ratio touch screen of the present invention.
Fig. 6 is the cut-open view of another state of the 3rd preferred embodiment of high light transmittance ratio touch screen of the present invention.
Fig. 9 is the cut-open view of the 4th preferred embodiment of high light transmittance ratio touch screen of the present invention.
Fig. 4, Fig. 7, Figure 10～Figure 12 are the transmittance and the graphs of a relation between the visible wavelength section of the present invention and prior art.
Fig. 5, Fig. 8, Figure 13～Figure 15 are the reflectivity and the graphs of a relation between the visible wavelength section of the present invention and prior art.
Figure 16 is that the present invention and prior art are according to the graph of a relation of ASTM-D1003 international standard with the measured whole penetrance of Haze-Gard Plus haze meter.
Embodiment
About the preferred embodiments of the present invention and technology contents, existing accompanying drawings is as follows:
At first, please refer to Fig. 1, in first embodiment, high light transmittance ratio touch screen of the present invention has a substrate 6 and one first reflection coating layer structure A.Wherein, substrate 6 has one positive 7 and one reverse side 12 with respect to front 7, defines its front 7 at this and be meant the side that is adjacent to the user, and reverse side 12 is meant the side that is adjacent to backlight that substrate 6 can be that glass, plastics or other transparent material are made; The first reflection coating layer structure A is a kind of four-layer structure, comprise a ground floor 1, one second layer 2, one the 3rd layer 3 and 1 the 4th layer 4, and from the side that is adjacent to substrate 6 successively with ground floor 1, the second layer 2, be configured on the front 7 of substrate 6 for the 3rd layer 3 and the 4th layers 4, and the mode of these layers configuration can be utilized the technology of vacuum coating (vacuum coating), as sputter (sputtering), evaporation (evaporation), chemical vapor deposition (chemical vapordeposition) or other wet type coating technique (other wet coating technologies) and form.
The second layer 2 is monoxide layers, has the refractive index between 1.3～1.5; In the present embodiment, the material of the second layer 2 for example is silicon dioxide (SiO
2).In addition, the material of the second layer 2 also can be the low-refraction material of poriness (porous), interpolation chlorine element (fluorinated) or organic transformation (organically modified).
The 3rd layer 3 is a transparent conductive layer (transparent conductive layer), has the refractive index between 1.8～2.5, and has the resistance value between 200～10000 ohm/unit area (Ohm/square); In the present embodiment, the 3rd layer 3 is on the electrode pattern (electrode pattern) that is connected to the contact panel edge; In addition, the 3rd layer 3 material for example is to add niobium pentaoxide (Nb in tin indium oxide (ITO)
2O
5).Certainly, the 3rd layer 3 material also can be antimony tin (ATO), tin indium oxide (ITO), tin ash (SnO
2), zinc oxide (ZnO
2), indium sesquioxide (In
2O
3) and combination, at this, tin indium oxide (ITO) is meant pure ITO (pure ITO).Yet, above-mentioned additive (niobium pentaoxide (Nb
2O
5)) can determine according to demand whether to add, and the content that adds accounts for 0.1～20% of integral body.
The 4th layer 4 is protective seams, has refractive index (refractiveindex) between 1.3～1.5, the thickness of this layer is 0.1 micron (μ m) at least, and the hardness of this layer is passed through the international test stone of ASTM-D3363 of 9H, and can be by the anti-scratch test of at least 1000 AUS military discipline anti scuffing standards (military standard MIL-C-675C); In the present embodiment, the 4th layer 4 material can be silicon dioxide (SiO
2) or organic transformation tripoli (organically modified silica).
From as can be known above-mentioned, the present invention is at the reflection coating layer of a kind of four-layer structure of substrate 6 positive 7 coatings of touch screen, the refractive index of these retes is counted from a side of adjacent substrates 6, be designed to high and low, high and low (being expressed as H, L, H, L) successively, so can make the transmittance of touch screen of the present invention can reach ASTM-D1003 more than 92%.In addition, because the outermost layer of these retes is defined as a protective seam, and pass through the design of this protective seam, thus can strengthen its surperficial resistance to abrasion.
Then, please refer to Fig. 2-1～Fig. 2-5, it is second preferred embodiment of the present invention, five kinds of states are arranged, shown in Fig. 2-1, under above-mentioned four layers anti-reflection structure, can also be by two-sided mode with pickling or acid etching with substrate 6, make the surface roughening of the positive and negative 7,12 of substrate 6, thereby have anti-effect of dazzling light (anti-glare).Certainly, be not limited to the mode of above-mentioned two-sided pickling or acid etching, also can be shown in Fig. 2-2, only form a coarse surface in front 7 near user's substrate 6.In addition, shown in Fig. 2-3, also can add several particulates (particle) 13 at the outermost layer (promptly the 4th layer 4) of above-mentioned four layers of anti-reflection structure, make the refractive index of this particulate 13 become 1.5～2.5, thereby reach anti-effect of dazzling light, and the diameter of above-mentioned particulate 13 is between 0.01～4 micron (μ m).In addition, also can be under above-mentioned four layers anti-reflection structure, as Fig. 2-4, on the 4th layer 4 of anti-reflection structure, spray a layer 5 (the anti-photosphere of dazzling) 5 in addition, this layer 5 (the anti-photosphere of dazzling) 5 adopts the mode of spraying to form, and mean roughness (roughness) can make its surface roughening between 0.01～0.4 micron (μ m), thereby has anti-effect of dazzling light.Certainly, above-mentioned mentioned layer 5 (anti-dazzle photosphere) 5 is not limited to and just forms after four layers anti-reflection structure all completes, also can be shown in Fig. 2-5, after making the 3rd layer 3, promptly spray this layer 5 (the anti-photosphere of dazzling) 5, form the 4th layer 4 at last again.
Then, please refer to Fig. 3, it is wherein a kind of state of the 3rd preferred embodiment of the present invention, this embodiment and the foregoing description difference are: set up one second reflection coating layer structure B, comprise one the 8th layer 8,1 the 9th layer 9 and 1 the tenth layer 10, and successively the 8th layer 8, the 9th layers 9 and the tenth layers 10 are configured on the reverse side 12 of substrate 6 from a side that is adjacent to substrate 6, these layers can utilize the technology of vacuum coating equally, form as sputter, evaporation, chemical vapor deposition or other wet type coating technique.
The 8th layer 8 refractive index is equal to ground floor 1; The 9th layer refractive index is equal to the second layer 2; The tenth layer 10 refractive index is equal to the 3rd layer 3, and has 10～10
5The resistance value of ohm/unit area, and be connected on the conductor (conductor) of face plate edge.In the present embodiment, the tenth layer 10 can be a tin indium oxide (ITO) layer, and has the resistance value of 100～700 ohm/unit area (ohm/square).
From as can be known above-mentioned, the present invention is at the reflection coating layer of a kind of three-decker of reverse side 12 coatings of the substrate 6 of touch screen, the refractive index of these retes is counted from a side of adjacent substrates 6, be designed to high and low, high (being expressed as H, L, H) successively, so that touch screen of the present invention can further reduce reflection and increase transmittance, and the tenth layer 10 design can also have the function that anti electromagnetic wave disturbs (EMI).
Add under the structure of a protective seam at above-mentioned double-deck ITO, the performance of its transmittance and reflectivity can be with reference to Fig. 4 and Fig. 5, and wavelength is at the section of 431～692nm, and its transmittance on average can increase to more than 92%; Wavelength is at the section of 440～700nm, and its reflectivity all is lower than 10%.
Then, please refer to Fig. 6, is another enforcement state of the 3rd preferred embodiment of the present invention, is can spray equally a layer 5 (the anti-photosphere of dazzling) 5 with respect to its difference of Fig. 3 on the 4th layer 4 of anti-reflection structure.Certainly, layer 5 (the anti-photosphere of dazzling) 5 also can be configured between the 3rd layer 3 and the 4th layers 4 (not shown) as described above.
And add at above-mentioned double-deck ITO under the structure of a protective seam and a layer 5 (the anti-photosphere of dazzling) 5; the performance of its transmittance and reflectivity can be with reference to Fig. 7 and Fig. 8, especially can with transmittance more than or equal to 90% and reflectivity be adjusted into comparatively level and smooth curve at section smaller or equal to 10%.
Then; please refer to Fig. 9; it is the 4th preferred embodiment of the present invention; this embodiment and the 3rd preferred embodiment difference are; the second reflection coating layer structure B can also include eleventh floor 11; its refractive index is equal to the 4th layer 4, and this eleventh floor 11 is one to be configured in the protective seam on the tenth layer 10.
From as can be known above-mentioned, the second reflection coating layer structure B in the touch screen of the present invention can also increase to four-layer structure, its refractive index is the design of mirror (mirror) configuration with respect to first reflection coating layer structure (HLHL) A just, thereby can make the whole performance of transmittance in the wavelength of visible light scope can be more stable.
The effect that the present invention can reach can also be further from hereinafter and corresponding obtain to prove graphic.The comparison of transmittance at first is described, concerning simple glass substrate, wavelength in the visible-range of 380～780nm, its whole transmittance (as shown in figure 10) between 80～90%; After glass substrate was coated with double-deck ITO, wavelength was at the section of 442～625nm, and its transmittance can increase to more than 90%, but wavelength is less than 407nm, greater than the section of 747nm, and transmittance then drops to (as shown in figure 11) below 80%; Behind above-mentioned further again coating protective seam of the present invention, wavelength is at the section of 431～692nm, and its transmittance on average can increase to (as shown in Figure 4) more than 92%; In other words, the present invention is after being coated with protective seam, and except increasing wear-resistant effect, transmittance is in the section scope more than 92%, wider with respect to the glass substrate that only is coated with double-deck ITO; Then, please refer to Fig. 7, the present invention added layer 5 (the anti-photosphere of dazzling) at 5 o'clock, especially transmittance can be adjusted into comparatively level and smooth curve at the section more than 90%; In other words, can further stablize the performance of this touch screen on showing.And its transmittance of above-mentioned figure compares in the intersegmental integral body of visible region, can be with reference to Figure 12.
Then, please refer to Fig. 5, Figure 13～Figure 15, these graphic Y-axis are represented with reflectivity in addition, adopt glass substrate merely, and wavelength is in visible-range, and its whole reflectivity is all in (as shown in figure 13) below 10%; Behind the double-deck ITO of coating on the glass substrate, wavelength is at the section of 480～580nm, and its reflectivity drops to below 5%, but wavelength is less than 440nm, greater than the section of 660nm, and reflectivity then rises (as shown in figure 14) more than 10%; After further being coated with protective seam of the present invention, reflectivity is lower than section below 10% with respect to the glass substrate of the double-deck ITO of simple coating, and it can increase to the scope (as shown in Figure 5) of wavelength 440～700nm; The present invention added layer 5 (the anti-photosphere of dazzling) at 5 o'clock, especially reflectivity can be adjusted into comparatively level and smooth curve at the section below 10%, and then improve the performance (as shown in Figure 8) of touch screen on showing.And its reflectivity of above-mentioned figure compares in the integral body of visible light section, can be with reference to Figure 15.
In addition; please refer to following table one and Figure 16; be expression according to ASTM-D 1003 international standards with the measured whole penetrance of Haze-Gard Plus haze meter (this haze meter is that the TFT-LCD penetrability is for example measured the reference instrument of transmitance, transmission haze, perspectivity sharpness entirely); by the result as can be seen the present invention under the framework of many layer protective layers or layer 5 (the anti-photosphere of dazzling) 5 with respect to being merely under the framework of glass substrate or double-deck ITO, its whole penetrance is to be better than prior art really.
Table one
| Glass substrate (plain glass) 2.8m/m | Double-deck ITO 2.8m/m | Double-deck ITO+ single ply protective layer 2.8m/m | Double-deck ITO+ single ply protective layer+layer 5 (the anti-photosphere of dazzling) 2.8m/m | |
| T | 92.2 | 93 | 93.7 | 93.2 |
The above is the preferred embodiments of the present invention only, is not limited to the present invention.In the above-described embodiments, the present invention can have various changes and variation.Within the spirit and principles in the present invention all; any modification of being done, be equal to replacement, improvement etc.; for example at the front 7 or the reverse side 12 of substrate 6; cardinal rule according to four layers of anti-reflection structure of above-mentioned formation; repeat to form more multi-layered anti-reflecting layer, all should be included within protection scope of the present invention.
Claims (16)
1. high light transmittance ratio touch screen is characterized in that comprising:
One substrate has a positive and reverse side with respect to described front; And
One first reflection coating layer structure, comprise a ground floor, a second layer, one the 3rd layer and one the 4th layer, and outside a side direction that is adjacent to described substrate with described ground floor, the described second layer, described the 3rd layer and described the 4th layer arranged in order on the described front of described substrate, wherein:
Described ground floor is the monoxide layer, has to be higher than 1.5 refractive index;
The described second layer is the monoxide layer, has the refractive index between 1.3～1.5;
Described the 3rd layer is a transparent conductive layer, has the refractive index between 1.8～2.5, and has the resistance value between 200～10000 ohm/unit area;
Described the 4th layer is a protective seam, has the refractive index between 1.3～1.5, and described the 4th layer thickness is at least 0.1 micron (μ m), and described the 4th layer hardness is by the international test stone of the ASTM-D3363 of 9H.
2. high light transmittance ratio touch screen according to claim 1 is characterized in that: the material of described ground floor is to be selected from niobium pentaoxide (Nb
2O
5), tin indium oxide (ITO), antimony tin (ATO), niobium oxide (niobium oxide), titanium oxide (titanium oxide), tantalum pentoxide (tantalum oxide) and the oxide (mixtures of these oxide) that mixes thereof.
3. high light transmittance ratio touch screen according to claim 1 is characterized in that: the material of the described second layer is silicon dioxide (SiO
2).
4. high light transmittance ratio touch screen according to claim 1 is characterized in that: the material of the described second layer is the low-refraction material of poriness (porous), interpolation chlorine element (fluorinated) or organic transformation (organically modified).
5. high light transmittance ratio touch screen according to claim 1 is characterized in that: described the 3rd layer material is that tin indium oxide (ITO) adds niobium pentaoxide (Nb
2O
5) additive.
6. high light transmittance ratio touch screen according to claim 1 is characterized in that: described the 3rd layer optional autoxidation antimony of material tin (ATO), tin indium oxide (ITO), tin ash (SnO
2), zinc oxide (ZnO
2), indium sesquioxide (In
2O
3) and combination.
7. high light transmittance ratio touch screen according to claim 1 is characterized in that: described the 4th layer material is silicon dioxide (SiO
2) or organic transformation tripoli (organicallymodified silica).
8. high light transmittance ratio touch screen according to claim 1, it is characterized in that: the described first reflection coating layer structure also comprises a layer 5, described layer 5 is to be configured in the anti-photosphere (anti-glare layer) of dazzling of one on described the 4th layer, described layer 5 (the anti-photosphere of dazzling) has a rough surface (rough surface), and mean roughness (roughness) is between 0.01～0.4 micron (μ m).
9. high light transmittance ratio touch screen according to claim 1 is characterized in that: the described front of described substrate and described reverse side or only described front are a roughened surface.
10. high light transmittance ratio touch screen according to claim 1, it is characterized in that: also further be added with a plurality of particulates (particle) in described the 4th layer, the diameter of these particulates makes described particulate have 1.5～2.5 refractive index between 0.01～4 micron (μ m).
11. high light transmittance ratio touch screen according to claim 1, it is characterized in that: also comprise a layer 5, described layer 5 is one to be configured in the anti-photosphere of dazzling between described the 3rd layer and described the 4th layer, described layer 5 (the anti-photosphere of dazzling) has a rough surface (roughsurface), and mean roughness (roughness) is between 0.01～0.4 micron (μ m).
12. high light transmittance ratio touch screen according to claim 1, it is characterized in that: also comprise one second reflection coating layer structure, comprise one the 8th layer, one the 9th layer and 1 the tenth layer, and outside a side direction that is adjacent to described substrate with described the 8th layer, the arranged in order of described the 9th layer and the described ten layer on the described reverse side of described substrate, wherein:
Described the 8th layer refractive index is equal to described ground floor;
Described the 9th layer refractive index is equal to the described second layer;
The described ten layer refractive index is equal to described the 3rd layer, and has 10～10
5The resistance value of ohm/unit area (ohm/square).
13. high light transmittance ratio touch screen according to claim 12 is characterized in that: the described ten layer is a tin indium oxide (ITO) layer, and has the resistance value of 100～700 ohm/unit area (ohm/square).
14. high light transmittance ratio touch screen according to claim 12; it is characterized in that: the described second reflection coating layer structure also comprises an eleventh floor; the refractive index of described eleventh floor is equal to described the 4th layer, and described eleventh floor is one to be configured in the protective seam on the described ten layer.
15. high light transmittance ratio touch screen according to claim 12, it is characterized in that: also comprise a layer 5, described layer 5 is to be configured in the anti-photosphere of dazzling of one on described the 4th layer, described layer 5 (the anti-photosphere of dazzling) has a rough surface (rough surface), and mean roughness (roughness) is between 0.01～0.4 micron (μ m).
16. high light transmittance ratio touch screen according to claim 12, it is characterized in that: also comprise a layer 5, described layer 5 is to be configured in the anti-photosphere of dazzling of one between described the 3rd layer and described the 4th layer, described layer 5 (the anti-photosphere of dazzling) has a rough surface (rough surface), and mean roughness (roughness) is between 0.01～0.4 micron (μ m).
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