JP2017167572A - Resistive film type touch panel and method for manufacturing the same, and touch panel display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a manufacturing cost while keeping or improving visibility of a display arranged on rear of a touch panel.SOLUTION: A touch panel 10 has two double layered materials 11 and 15 having transparent base materials 12 and 16 and transparent conductive layers 13 and 17 in contact with the transparent base materials 12 and 16. The first double layered material 11 and the second double layered material 15 are arranged so as to face each other so that the transparent conductive layer 13 of the first double layered material 11 and the transparent conductive layer 17 of the second double layered material 15 are separated from each other. The transparent conductive layer 13 of the first layered material 11 pushed to the side of the second double layered material 15 by an operator is formed of a material containing carbon nanotube as a main component. The transparent base material 12 of the first double layered material 11 is formed of one material of polyethylene terephthalate, polycarbonate, a polymethyl methacrylate resin, a cyclic olefin polymer and silicate glass.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a resistive film type touch panel, a manufacturing method thereof, and a touch panel display.

  Many portable electronic devices such as portable communication devices and portable game machines are equipped with a touch panel display that has excellent input / output convenience. A touch panel display has a touch panel arranged on the display. As a method for detecting the touch position of the touch panel, there are a resistance film type, a surface acoustic wave type, an electromagnetic induction type, an electrostatic induction type, and the like.

  The resistive film type touch panel includes two sheet-like members arranged to face each other with a space therebetween. Each of the two sheet-like members has a transparent substrate and a transparent conductive layer.

  Patent Document 1 below discloses a sheet-like member used for a touch panel. This sheet-like member has a transparent base material, an antireflection film, and a transparent conductive layer. The antireflection film is disposed between the transparent substrate and the transparent conductive layer.

Japanese Patent No. 5274103

  In the technique described in Patent Document 1, an antireflection film is disposed between the transparent substrate and the transparent conductive layer in order to improve the visibility of the display disposed behind the touch panel. For this reason, the technique described in Patent Document 1 has a problem that the manufacturing cost increases.

  Then, an object of this invention is to provide the touchscreen which can solve the said subject, its manufacturing method, and a touchscreen display.

The touch panel as one aspect according to the invention for solving the above-mentioned problems is
Provided with two multilayer materials having a transparent base material and a transparent conductive layer in contact with the transparent base material, so that the transparent conductive layers of the two multilayer materials face each other at intervals, The two multi-layer materials are arranged opposite to each other, and the transparent conductive layer of the first multi-layer material, which is pushed by the operator to the other multi-layer material side, is mainly composed of carbon nanotubes. The transparent base material of the first return layer material is formed of one material of polyethylene terephthalate, polycarbonate, polymethyl methacrylate resin, cyclic olefin polymer, and silicate glass. .

The touch panel display as one aspect according to the invention for solving the above-mentioned problems is
On the basis of the resistive film type touch panel, a touch panel driving circuit for driving the resistive film type touch panel, and a second multilayer material disposed opposite to the first multilayer material among the two multilayer materials. A liquid crystal panel disposed on the opposite side of the first multilayer material, a liquid crystal panel driving circuit for driving the liquid crystal panel, a backlight for emitting light to the liquid crystal panel, and the backlight. A backlight driving circuit to be driven.

A method for manufacturing a touch panel as one aspect according to the invention for solving the above-described problems is as follows.
A preparation step of preparing two multilayer materials having a transparent substrate and a transparent conductive layer in contact with the transparent substrate, and the transparent conductive layers of the two multilayer materials are spaced apart from each other And arranging the two multi-layer materials so as to face each other and fixing the relative position of the two multi-layer materials, and in the preparation step, Among them, as the first multilayer material pushed by the operator to the opposite multilayer material side, the transparent conductive layer is formed of a material mainly composed of carbon nanotubes, and the transparent substrate is made of polyethylene terephthalate, polycarbonate, A methyl methacrylate resin, a cyclic olefin polymer, or a silicate glass made of one material is prepared.

  ADVANTAGE OF THE INVENTION According to this invention, manufacturing cost can be held down, maintaining or improving the visibility of the display arrange | positioned behind a touch panel.

It is sectional drawing of the touchscreen as 1st embodiment which concerns on this invention. It is explanatory drawing which shows how to obtain | require the reflectance of the member which has several layers. It is explanatory drawing which shows the contrast ratio of the touchscreen as 1st embodiment which concerns on this invention, and the contrast ratio of the touchscreen of a comparative example. It is explanatory drawing which shows the backlight electric current value at the time of using the touchscreen of a comparative example, and the backlight electric current value at the time of using the touchscreen as 1st embodiment which concerns on this invention. It is explanatory drawing which shows the light emission characteristic of a backlight. It is explanatory drawing which shows the brightness | luminance of each component of the light from the touchscreen as 1st embodiment which concerns on this invention, and the brightness | luminance of each component of the light from the touchscreen of a comparative example. It is explanatory drawing which shows the reflectance of a multilayer material when the value of the refractive index of a transparent base material and the value of the refractive index of a transparent conductive layer are made into various values. It is sectional drawing of the touchscreen as 2nd embodiment which concerns on this invention. It is a sectional view of a touch panel display as one embodiment concerning the present invention. It is explanatory drawing which shows the brightness | luminance of each component of the light from the touchscreen in the touchscreen display as one Embodiment which concerns on this invention.

"First embodiment of touch panel"
1st Embodiment of the touchscreen which concerns on this invention is described using FIGS.

  As shown in FIG. 1, the touch panel 10 of the present embodiment is a resistive film type touch panel, a first multilayer material 11 having a transparent substrate 12 and a transparent conductive layer 13, and a transparent substrate 16 and a transparent conductive layer 17. A second multilayer material 15 having Each of the transparent base materials 12 and 16 and the transparent conductive layers 13 and 17 of the multilayer materials 11 and 15 has a sheet shape or a plate shape. The transparent conductive layers 13 and 17 of the multilayer materials 11 and 15 are in contact with the surfaces of the transparent base materials 12 and 16. The two multilayer materials 11 and 15 are arranged to face each other so that the transparent conductive layers 13 and 17 face each other with a space therebetween.

  The touch panel 10 of the present embodiment is disposed on the display surface of a display such as a liquid crystal display. Of the two multilayer materials 11, 15 of the touch panel 10, one multilayer material 11 forms the first multilayer material 11 that is pushed to the display side Sd by an operator's finger or the like, and the other multilayer material 15. Constitutes the second multilayer material 15 arranged on the display side Sd with respect to the first multilayer material 11. Therefore, the transparent conductive layer 13 of the first multilayer material 11 is disposed on the display side Ds of the transparent substrate 12, and the transparent conductive layer 17 of the second multilayer material 15 is disposed on the operation side So (display of the transparent substrate 16). (Opposite side Sd).

  The transparent base material 12 of the first multilayer material 11 is made of polyethylene terephthalate (PET). The transparent conductive layer 13 of the first multilayer material 11 is made of a material mainly composed of a double-walled carbon nanotube (CNT). Therefore, the first multilayer material 11 is obtained by forming a double-layer CNT on the transparent base material 12 made of PET by, for example, a well-known wet coating method. In addition, as a wet coating method suitable for film formation of the double-walled CNT, for example, a method in which the double-walled CNT is mixed in a CNT dispersant such as a surfactant or a polymer, and this is applied onto the transparent substrate 12. There is.

  The transparent substrate 16 of the second multilayer material 15 is formed of silicate glass. The transparent conductive layer 17 of the second multilayer material 15 is made of ITO (Indium-Tin Oxide). Therefore, the second multilayer material 15 is obtained by depositing ITO on a transparent substrate 16 made of silicate glass by a known sputtering method or wet coating method.

The touch panel 10 of the present embodiment is manufactured by the following procedure.
First, the first multilayer material 11 and the second multilayer material 15 are prepared (preparation process). In this preparation step, for example, the first multilayer material 11 is formed by forming a double-layer CNT on the transparent substrate 12 made of PET by a known wet coating method or the like. Further, for example, an ITO film is formed on the transparent base material 16 made of silicate glass by a known sputtering method or wet coating method to form the second multilayer material 15.

  Next, the first multilayer material 11 and the second multilayer material 15 are arranged so that the transparent conductive layer 13 of the first multilayer material 11 and the transparent conductive layer 17 of the second multilayer material 15 face each other with a space therebetween. And the relative positions of the two multilayered materials 11 and 15 are fixed (arrangement step). As a method of securing the distance between the two multilayer materials 11 and 15 and fixing the relative position of the two multilayer materials 11 and 15, a spacer or the like is provided between the two multilayer materials 11 and 15. There is a way to arrange.

  With the above, the touch panel 10 of the present embodiment is manufactured.

  Next, the effect of the touch panel 10 of this embodiment will be described in comparison with a touch panel of a comparative example. In addition, the touch panel of the comparative example is obtained by forming the transparent conductive layer 13 of the first multilayer material 11 of the present embodiment from ITO, and other configurations are the same as the touch panel 10 of the present embodiment.

<Reflectance>
The reflectance of the first multilayer material 11 will be described.
When the refractive index of the medium is n ₀ , and the refractive index of the reflecting surface is n ₁ , the reflectance R when light is incident perpendicular to the reflecting surface is expressed by the following formula (1).
R = {(n ₀ −n ₁ ) / (n ₀ + n ₁ )} ² (1)

Further, the reflectance Ri of a member having a plurality of layers is represented by the following formula (2), assuming that the reflectances R1, R2, and R3 on the surface of each layer are as shown in FIG.
Ri = R1 + R2 + R3 (2)

  In the present embodiment, the refractive index of PET forming the transparent base material 12 of the first multilayer material 11 is 1.60. The refractive index of the double-walled CNT forming the transparent conductive layer 13 of the first multilayer material 11 is 1.50 to 1.60. The refractive index of air in contact with the transparent base material 12 and the transparent conductive layer 13 of the first multilayer material 11 is 1.00.

  For this reason, the reflectance R1 at the interface between air and the transparent substrate 12 is 5.3%. The reflectance R2 at the interface between the transparent substrate 12 and the transparent conductive layer 13 is 0.0 to 0.1%. The reflectance R3 at the interface between the transparent conductive layer 13 and air is 4.0 to 5.3%. Therefore, the reflectance of the first multilayer material 11 of the present embodiment is 9.3 to 10.7%.

  Moreover, in the case of a comparative example, reflectance R1 in the interface of air and a transparent substrate made of PET is 5.3%. The reflectance R2 at the interface between the transparent substrate made of PET and the transparent conductive layer made of ITO having a refractive index of 2.10 to 2.20 is 1.8 to 2.5%, and the transparent conductive layer made of ITO and The reflectance R3 at the interface with air is 12.6 to 14.1%. Therefore, the reflectance of the first multilayer material of the comparative example is 19.7 to 21.9%.

  As described above, in the touch panel 10 of the present embodiment, the reflectance of the first multilayer material 11 can be made lower than that of the first multilayer material of the comparative example, in other words, the reflection of external light can be suppressed. Visibility can be improved.

<Contrast ratio>
A contrast ratio when a touch panel is arranged on the liquid crystal display and white display on the liquid crystal display and black display will be described.

  Here, a touch panel is arranged on a 10.4 inch size liquid crystal display, and the brightness of the touch panel when the liquid crystal display is displayed in white and black is measured in an environment with an external light illuminance of 500 lux. The above-described contrast ratio was obtained.

As a result, in the touch panel 10 of the present embodiment, as shown in FIG. 3, the luminance during white display is 140 cd / m ² and the luminance during black display is 8.2 cd / m ² . Therefore, the contrast ratio of the touch panel 10 of the present embodiment is 17: 1.

On the other hand, in the touch panel of the comparative example, the luminance during white display was 158 cd / m ² and the luminance during black display was 10.5 cd / m ² . Therefore, the contrast ratio of the comparative touch panel is 15: 1.

  In the touch panel 10 of the present embodiment, the brightness at the time of white display and the brightness at the time of black display are lower than those of the touch panel of the comparative example. However, in the touch panel 10 according to the present embodiment, the degree of low brightness during black display relative to the brightness during white display is lower than that of the touch panel of the comparative example due to the low external light reflection effect.

  For this reason, in the touch panel 10 of the present embodiment, the contrast ratio between the white display and the black display on the display is 13% larger than that of the comparative example, and the visibility can be improved.

  In the above, a test for measuring the contrast ratio was performed in an environment with an external light illuminance of 500 lux. For example, in an environment of about 0.2 lux equivalent to nighttime moonlight or 100, Even if the test is performed in an environment of about 000 lux, the test result is basically the same as the above test result.

<Backlight current value and visibility>
A relationship between the visibility of the current value flowing through the backlight of the liquid crystal display when the touch panel is disposed on the liquid crystal display will be described.

  Here, a touch panel was placed on a 10.4 inch size liquid crystal display, and the value of the current passed through the backlight was measured. At this time, the same current value as that when the contrast ratio was 15: 1 was passed through the backlight of the liquid crystal display in which the touch panel of the comparative example was arranged. Further, in the liquid crystal display in which the touch panel 10 of the present embodiment is arranged, the brightness of the liquid crystal display is adjusted by adjusting the value of the current passed through the backlight so that the contrast ratio is the same as the contrast ratio (15: 1) of the comparative example. changed. Then, the current value flowing through the backlight at that time was measured.

  As a result, in the touch panel 10 of the present embodiment, as shown in FIG. 4, the backlight current value was 159 mA, and in the comparative touch panel, the backlight current value was 183 mA. Therefore, by using the touch panel 10 of the present embodiment, when the contrast ratio between the white display and the black display on the display is the same, the backlight current value is reduced by 18% compared to the comparative touch panel. Can be made.

  Furthermore, the touch panel of the comparative example is arranged on the liquid crystal display, and the touch panel 10 of the present embodiment is arranged on the liquid crystal display, and the contrast ratio is adjusted to be equal to the contrast ratio of the comparative example as described above. The 40 users were asked to answer the question “Which is easier to see?”. As a result, 19 users who answered that the touch panel 10 of the present embodiment is easy to see are 21 users, and 21 users who answered that the touch panel of the comparative example is easy to see, and there is a difference in visibility between them. There wasn't.

  Therefore, by using the touch panel 10 of the present embodiment, the supply current to the backlight can be suppressed while maintaining the visibility of the liquid crystal display. That is, in the touch panel of this embodiment, the visibility improvement effect demonstrated previously can be passed on to the power saving effect.

<Light absorption characteristics>
The light component absorption characteristics of the touch panel will be described.

  Here, a touch panel is arranged on a 10.4 inch size liquid crystal display, and the luminance of each component of the light emitted from the touch panel when the light component emitted from the backlight of the liquid crystal display is subjected to specific conditions was measured. . The light components here are an R component, a G component, and a B component. The R component of light is a component of light having a luminance or luminous intensity peak within a wavelength range of ± 10 nm with reference to a wavelength of 70.0 nm and including light having a wavelength within this range. The G component of light is a component of light having a luminance or luminous intensity peak within a wavelength range of ± 10 nm with a wavelength of 546.1 nm as a reference, and at least including light having a wavelength within this range. The B component of light is a light component having a luminance or luminous intensity peak within a wavelength range of ± 10 nm with a wavelength of 435.8 nm as a reference and including light having a wavelength within this range.

  In measuring the luminance of each component of light emitted from the touch panel, first, the luminance of each component of light emitted from the liquid crystal display was measured.

  The liquid crystal display has a liquid crystal panel and a backlight disposed on the back surface thereof. As the backlight, one having a blue LED (Light Emitting Diode) and a white LED having a YAG phosphor material was used. In this measurement, the backlight was turned on while white was displayed on the liquid crystal panel, and the luminance of each component of the light emitted from the liquid crystal display at that time was measured. At this time, the luminance of each component of the light was measured by changing the luminance of the backlight in three stages of “large”, “medium”, and “small”. To measure the luminance of each component of light, the luminance of the Yxy color system was measured with a color luminance meter (CS-100A manufactured by Konica Minolta). Thereafter, the luminance of the Yxy color system is converted to the luminance of the XYZ color system using the following equation (3), and then converted to the luminance of sRGB (standard RGB) using the following equation (4). .

X = (x / y) · Y
Y = Y
Z = {(1-xy) · y} · Y (3)

R = 3.241X-1.5374Y-0.4986Z
G = −0.9692X + 1.786Y + 0.0416Z
B = 0.0556X−0.204Y + 1.507Z (4)

  The measurement results are shown in FIG. FIG. 5 shows relative values of the luminance of the G component and the luminance of the B component based on the luminance of the R component. Therefore, in FIG. 5, the luminance of the R component when the backlight luminance is “high”, the luminance of the R component when the backlight luminance is “medium”, and the luminance of the backlight “small”. The luminance of the R component is 100%. However, the actual luminance of the R component when the luminance of the backlight is “high” is higher than the actual luminance of the R component when the luminance of the backlight is “medium”. The actual luminance of the R component when the backlight luminance is “medium” is higher than the actual luminance of the R component when the backlight luminance is “small”.

  When the backlight luminance was “high”, the luminance of the R component was 100%, the luminance of the G component was 107%, and the luminance of the B component was 170%. When the backlight luminance was “medium”, the luminance of the R component was 100%, the luminance of the G component was 107%, and the luminance of the B component was 169%. When the luminance of the backlight was “small”, the luminance of the R component was 100%, the luminance of the G component was 107%, and the luminance of the B component was 168%.

  From the above results, it can be confirmed that the backlight has a tendency that the luminance of the B component is relatively decreased with respect to the luminance of the R component and the G component as the luminance is reduced.

  Next, the luminance of each component of the light emitted from the touch panel when the touch panel is arranged on the liquid crystal display having the backlight having the light emission characteristics described above was measured, and the result will be described with reference to FIG. .

  In this measurement, the luminance of the backlight is set to “Large”, “Medium”, and “Small” as in the case of measuring the luminance of each component of the light emitted from the liquid crystal display when the touch panel is not disposed on the liquid crystal display. The brightness of each component of the light was measured in the same manner as described above in three stages.

  When the touch panel 10 of the present embodiment is arranged on a liquid crystal display, when the backlight luminance is “high”, the luminance of the R component is 100%, the luminance of the G component is 107%, and the luminance of the B component is 168%. there were. When the backlight luminance was “medium”, the luminance of the R component was 100%, the luminance of the G component was 108%, and the luminance of the B component was 167%. When the backlight luminance was “low”, the luminance of the R component was 100%, the luminance of the G component was 109%, and the luminance of the B component was 166%.

  On the other hand, when the touch panel of the comparative example is arranged on the liquid crystal display, when the backlight luminance is “high”, the luminance of the R component is 100%, the luminance of the G component is 106%, and the luminance of the B component is 161%. there were. When the backlight luminance was “medium”, the luminance of the R component was 100%, the luminance of the G component was 107%, and the luminance of the B component was 159%. When the backlight luminance was “low”, the luminance of the R component was 100%, the luminance of the G component was 107%, and the luminance of the B component was 159%.

  From the above results, when the touch panel 10 of the present embodiment is adopted, the brightness of the B component is larger than when the touch panel of the comparative example is adopted regardless of whether the backlight brightness is “large”, “medium”, or “small”. I understand that In other words, when the touch panel 10 of the present embodiment is adopted, the touch panel 10 is arranged from the state where the touch panel 10 is not arranged on the liquid crystal display regardless of the backlight brightness “large”, “medium”, and “small”. It turns out that the brightness | luminance fall of B component becomes small when it changes to the state which is in comparison with the case where the touch panel of a comparative example is employ | adopted.

  This is because the two-layer CNT forming the transparent conductive layer 13 of the present embodiment has less B component, that is, blue absorption, than the ITO forming the transparent conductive layer of the comparative example. This can be attributed to the fact that the light absorption characteristics and reflection characteristics in the visible light wavelength region are neutral.

  Therefore, when the touch panel 10 of this embodiment is employed, the blue light emission intensity of the backlight can be reduced.

  In the above test, a backlight including a blue LED and a white LED having a YAG phosphor material was used. However, even when backlights with other specifications are used in the above tests, the test results are basically the same as the above test results. Specifically, for example, a test using a backlight having a blue LED and a white LED having a red / green phosphor material, or a backlight having a white LED composed of RGB three-color LEDs. However, the test results are basically the same as the test results.

  Further, in the test for examining the contrast ratio, the test for examining the relationship between the backlight current value and the visibility, and the test for examining the absorption characteristics of the light component, a 10.4 inch size liquid crystal display was used. However, even when liquid crystal displays of other sizes are used, the test results are basically the same as the test results described above.

<Summary of effects>
In the touch panel 10 of this embodiment, since reflection of external light can be suppressed without providing an antireflection layer between the transparent base material 12 and the transparent conductive layer 13 of the first multilayer material 11, The manufacturing cost can be suppressed while improving the visibility of the display arranged behind.

  Further, in the touch panel 10 of the present embodiment, the contrast ratio between the white display and the black display on the display arranged behind the touch panel 10 is increased, and from this viewpoint, the visibility of the display is improved. Can be made.

  Moreover, in the touch panel 10 of this embodiment, the power consumption of a display can be suppressed, maintaining the visibility of a display. That is, in the touch panel 10 of this embodiment, the above-described visibility improvement effect can be passed on to the power saving effect. Thus, in the touch panel 10 of this embodiment, since the power consumption of a display can be suppressed, the portable electronic device accompanying the miniaturization of the battery used for the portable electronic device provided with the display and the miniaturization of the battery. Can be reduced in size and weight.

  Furthermore, since the blue light emission intensity of the backlight can be reduced in the touch panel 10 of the present embodiment, the lifetime of the backlight can be extended and the power consumption of the display including the backlight can be increased.

  As described above, the touch panel 10 according to the present embodiment can reduce the manufacturing cost while improving the visibility of the display arranged behind the touch panel 10. Moreover, in the touch panel 10 of this embodiment, since the visibility improvement effect can be passed on to the power saving effect, the power consumption and manufacturing cost of the display can be suppressed while maintaining the visibility of the display.

  Moreover, in the touch panel 10 of this embodiment, the transparent base material 12 and the transparent conductive layer 13 of the first multilayer material 11 are brought into contact with each other, and an antireflection layer is provided between the transparent base material 12 and the transparent conductive layer 13. Therefore, the flexibility of the first multilayer material 11 that is pushed to the display side Sd with an operator's finger or the like can be ensured.

  Furthermore, in the touch panel 10 of this embodiment, since the transparent conductive layer 13 of the first multilayer material 11 is formed of two-layer CNT, the transparent conductive layer is formed of ITO due to the flexibility of the two-layer CNT. The period until the electrode is destroyed by repeated pressing can be made longer than in the case where the electrode is present. That is, in this embodiment, the lifetime of the touch panel 10 can be extended.

"Modification of the first embodiment"
The above effect of the touch panel 10 of the first embodiment is basically that the reflectance of the first multilayer material 11 is reduced and CNT is used as a material for forming the transparent conductive layer 13 of the first multilayer material 11. This is due to the use of the main component material.

  In order to reduce the reflectance of the first multilayer material 11, as can be understood from the above-described equation (1), the refractive index of one medium and the refractive index of the other medium are brought close to each other with the interface as a boundary. In addition, the number of interfaces may be reduced.

For this reason, the refractive index na of the transparent substrate 12 and the refractive index nb of the transparent conductive layer 13 satisfy the following formula (5), and the transparent conductive layer 13 and the transparent substrate 12 are brought into contact with each other. The reflectance of the multilayer material 11 can be reduced.
1.40 ≦ na ≦ 1.60
1.40 ≦ nb ≦ 1.60
0.00 ≦ | na−nb | ≦ 0.02 (5)

  When the condition shown in the above formula (5) is satisfied and the transparent conductive layer 13 and the transparent substrate 12 are brought into contact with each other, as shown in FIG. 7, the reflectance of the multilayer material 11 is as shown in FIG. , Approximately 10% or less, reflection of external light can be suppressed, and the visibility of the display can be improved.

  Therefore, as a forming material of the transparent conductive layer 13, a material mainly containing any one of single-walled CNT, double-walled CNT, and multi-walled CNT is used, and as a forming material of the transparent substrate 12, PET, Any one of polycarbonate (PC: PolyCarbonate), polymethyl methacrylate resin (PMMA: PolyMethyl MethAcrylate), cyclic olefin polymer (COP: CycloOlefin Polymer), and silicate glass can be used. The refractive indexes of these single-walled CNT, double-walled CNT, multilayered CNT, PET, PC, PMMA, COP, and silicate glass are all 1.40 or more and 1.60 or less. In addition, even when a material mainly composed of single-walled CNTs or multilayer CNTs is used as a material for forming the transparent conductive layer 13, the case where ITO is used is the same as the case where a material mainly composed of double-walled CNTs is used. In addition, the amount of blue absorption can be suppressed, and the life of the touch panel 10 can be extended.

  From the viewpoint of reducing the manufacturing cost, it is preferable to use a material mainly composed of double-walled CNT or multi-walled CNT among single-walled CNT, double-walled CNT, and multilayered CNT as the material for forming the transparent conductive layer 13. . This is because it is difficult to produce single-walled CNTs with a low impurity content, and the cost of single-walled CNTs with high purity is high.

  In addition, regarding the second multilayer material 15 of the touch panel 10 of the first embodiment, the material for forming the transparent conductive layer 17 is mainly one of single-wall CNT, double-wall CNT, and multilayer CNT. A material used as a component may be used, and any one of PET, PC, PMMA, COP, and silicate glass may be used as a transparent electrode forming material. Also in this case, it is preferable to contact the transparent conductive layer 17 and the transparent base material 16 in the same manner as the first multilayer material 11. As described above, the second multilayer material 15 is formed by forming the transparent conductive layer 17 and the transparent base material 16 of the second multilayer material 15 with the above materials and bringing the transparent conductive layer 17 and the transparent base material 16 into contact with each other. The reflectance of the display is reduced, and the visibility of the display can be further improved. Therefore, in this case, it is possible to further reduce the power consumption and manufacturing cost of the display while maintaining the visibility of the display.

"Second embodiment of touch panel"
A second embodiment of the touch panel according to the present invention will be described with reference to FIG.

  Similarly to the touch panel 10 of the first embodiment, the touch panel 10 a of the present embodiment also includes the first multilayer material 11 a and the second multilayer material 15. The touch panel 10a of the present embodiment further includes a bonding material 18 that fixes the relative positions of the outer peripheral portions of the first multilayer material 11a and the second multilayer material 15 so as to face each other with a gap therebetween, A plurality of dot spacers 19 disposed between the first multilayer material 11a and the second multilayer material 15;

  The bonding material 18 is formed of an insulating material. The bonding material 18 is disposed between the first multilayer material 11a and the second multilayer material 15 and is disposed on the outer peripheral portion of both the multilayer materials 11a and 15, and the outer periphery of both the multilayer materials 11a and 15 It is joined to the part. Therefore, the bonding material 18 plays a role as a spacer for maintaining the interval between the multilayer materials 11a and 15 in addition to the role of fixing the relative positions of the multilayer materials 11a and 15 in the outer peripheral portion. .

  The plurality of dot spacers 19 are also formed of an insulating material. The plurality of dot spacers 19 are provided on the second multilayer material 15 at intervals. The plurality of dot spacers 19 have a role of preventing contact with the second multilayer material 15 when the first multilayer material 11a is not pressed against the display side Sd by an operator's finger or the like.

  Similar to the first multilayer material 11 of the first embodiment, the first multilayer material 11 a includes a transparent base material 12 and a transparent conductive layer 13 that are in contact with each other. The first multilayer material 11 a further has a hard coat layer 14. The hard coat layer 14 is provided on the operation side So of the transparent substrate 12. The hard coat layer 14 is formed of, for example, an electron beam, an ultraviolet curable acrylic resin, a siloxane thermosetting resin, or the like. The hard coat layer 14 also preferably has a refractive index of 1.40 to 1.60 in order to suppress the reflectance of the touch panel 10a.

  The material for forming the transparent conductive layer 13 of the first multilayer material 11a is a single-walled CNT having a refractive index of 1.40 or more and 1.60 or less, as described in the modification of the first embodiment. It is preferable that the main component is any one of double-walled CNT and multi-walled CNT. In this embodiment, the material for forming the transparent base material 12 of the first multilayer material 11a is more preferably a material mainly composed of double-walled CNT or multilayered CNT. Moreover, as described in the column of the modification of the first embodiment, the forming material of the transparent base material 12 of the first multilayer material 11a is a PET whose refractive index is 1.40 or more and 1.60 or less. , PC, PMMA, COP, or silicate glass.

  Similar to the second multilayer material 15 of the first embodiment, the second multilayer material 15 includes a transparent substrate 16 and a transparent conductive layer 17 that are in contact with each other. The material for forming the transparent conductive layer 17 of the second multilayer material 15 is ITO, like the transparent conductive layer 13 of the first embodiment. However, the material for forming the transparent conductive layer 17 of the second multilayer material 15 is any one of single-walled CNT, double-walled CNT, and multilayered CNT as described in the column of the modification of the first embodiment. It is good that it is the material which has as a main component, especially the material which has bilayer CNT or multilayer CNT as a main component. Further, the material for forming the transparent base material 16 of the second multilayer material 15 is any one of PET, PC, PMMA, COP, and silicate glass as described in the column of the modification of the first embodiment. It should be a material.

  As mentioned above, since the touch panel 10a of this embodiment is equipped with all the structures of the touch panel 10 of 1st embodiment, the effect similar to the touch panel 10 of 1st embodiment can be acquired.

"Embodiment of touch panel display"
An embodiment of the touch panel display according to the present invention will be described with reference to FIGS. 9 and 10.

  As shown in FIG. 9, the touch panel display 100 of the present embodiment includes a touch panel 10a of the second embodiment, a liquid crystal panel 22 disposed behind the touch panel 10a, and a back disposed behind the liquid crystal panel 22. A light 24, a touch panel drive circuit 21 that drives the touch panel 10a, a liquid crystal panel drive circuit 23 that drives the liquid crystal panel 22, a backlight drive circuit 25 that drives the backlight 24, a communication circuit 26 that communicates with the outside, A memory 27 that stores various data, an arithmetic circuit 28 that controls the drive circuits 21, 23, 25, the communication circuit 26, and the like, a power supply circuit 29 that supplies power to the circuits, and a case 20 that covers these circuits It is equipped with.

  The touch panel drive circuit 21 applies a constant voltage to the transparent conductive layer 13 of the first multilayer material 11a and the transparent conductive layer 17 of the second multilayer material 15 to apply the voltage to the transparent conductive layer 13 of the first multilayer material 11a and the second multilayer material 11a. This is a circuit for detecting a contact position by a voltage change between the two due to contact of the layer material 15 with the transparent conductive layer 17.

  The liquid crystal panel 22 includes two transparent base materials in which transparent electrodes are incorporated, a liquid crystal disposed between the two transparent base materials, and two polarizing filters that sandwich the two transparent base materials. And have. The liquid crystal panel drive circuit 23 applies a voltage to the transparent electrodes respectively incorporated in the two transparent substrates, and changes the alignment of the liquid crystal disposed between the two transparent substrates.

  The backlight 24 includes the blue LED described above and a white LED having a YAG phosphor material. However, for example, the LED may include a blue LED and a white LED having a red / green phosphor material, or may include a white LED composed of RGB three-color LEDs.

  The backlight 24 of the present embodiment shown in FIG. 9 is a direct type backlight disposed behind the liquid crystal panel 22. However, the backlight 24 may be an edge light type backlight that is disposed on the side of the liquid crystal panel 22 and guides light to the liquid crystal panel 22 through a light guide plate or the like.

  The arithmetic circuit 28 is, for example, a CPU (Central Processing Unit). The communication circuit 26 is a circuit that communicates with the outside in response to an instruction from the arithmetic circuit 28.

  Since the touch panel display 100 of the present embodiment includes the touch panel 10a of the second embodiment, the effect of the touch panel 10a can be obtained.

  Further, in the present embodiment, focusing on the fact that the B component, that is, the blue absorption amount in the touch panel 10 a is small, the backlight drive circuit 25 keeps the power supplied to the LEDs constituting the backlight 24 low.

  In the touch panel display using the touch panel of the comparative example, the maximum luminance Lb of the B component is 170% of the maximum luminance Lr of the R component among the light components emitted from the backlight 24 as shown in FIG. .

  On the other hand, the backlight drive circuit 25 of the present embodiment is configured so that the maximum luminance Lb of the B component is 165% or less with respect to the maximum luminance Lr of the R component among the light components emitted from the backlight 24. The power supplied to the LEDs constituting the backlight 24 is controlled.

  From another point of view, the backlight drive circuit 25 according to the present embodiment includes LEDs that constitute the backlight 24 such that the maximum luminance Lb of the B component is 150% or less with respect to the maximum luminance Lg of the G component. Control the power supplied to the. In other words, the power supplied to the LEDs constituting the backlight 24 is controlled so that the maximum luminance Lb of the B component is equal to or lower than the luminance obtained by adding the luminance of half the maximum luminance Lg of the G component to the maximum luminance Lg of the G component. .

  In the above, the transparent conductive layer 13 of the first multilayer material 11a is formed of a material mainly composed of CNT (single layer, double layer, or multilayer), and the transparent conductive layer of the second multilayer material 15 is formed. This is an example in which 17 is formed of ITO. For this reason, the transparent conductive layers 11 and 17 of the first multilayer material 11a and the second multilayer material 15 are both formed of a material mainly composed of CNT (single layer, two layers, or multilayer). In other words, the backlight drive circuit 25 may control the power supplied to the LEDs constituting the backlight 24 so that the maximum luminance Lb of the B component is 160% or less with respect to the maximum luminance Lr of the R component. In this case, from another point of view, the backlight drive circuit 25 determines that the LED constituting the backlight 24 is such that the maximum luminance Lb of the B component is 146% or less with respect to the maximum luminance Lg of the G component. It is advisable to control the power supply.

  In some cases, the power supplied to the LEDs constituting the backlight 24 may be controlled so that the maximum luminance Lb of the B component is equal to or lower than the maximum luminance Lg of the G component. In this case, for example, the maximum luminance Lg of the G component may be higher than the maximum luminance Lr of the R component.

  As described above, in the present embodiment, since the amount of B component absorbed by the touch panel 10a is lower than that of the touch panel of the comparative example, among the light components emitted from the backlight 24 while maintaining the visibility of the liquid crystal panel 22, The maximum luminance Lr of the R component can be lowered.

  Therefore, in this embodiment, the lifetime of the backlight 24 and power saving can be achieved.

10, 10a: Touch panel 11, 11a: First multilayer material 12: Transparent substrate 13: Transparent conductive layer 14: Hard coat layer 15: Second multilayer material 16: Transparent substrate 17: Transparent conductive layer 18: Lamination Material 19: Dot spacer 20: Case 21: Touch panel drive circuit 22: Liquid crystal panel 23: Liquid crystal panel drive circuit 24: Backlight 25: Backlight drive circuit 26: Communication circuit 27: Memory 28: Arithmetic circuit 29: Power supply circuit 30: Case 100: Touch panel display

Claims (9)

Comprising two multilayer materials having a transparent base material and a transparent conductive layer in contact with the transparent base material;
The two multilayer materials are arranged opposite to each other so that the transparent conductive layers of the two multilayer materials are opposed to each other with a gap therebetween,
Of the two multilayer materials, the transparent conductive layer of the first multilayer material pushed by the operator to the other multilayer material side is formed of a material mainly composed of carbon nanotubes,
The transparent base material of the first reverse layer material is formed of one material of polyethylene terephthalate, polycarbonate, polymethyl methacrylate resin, cyclic olefin polymer, silicate glass,
Resistive touch panel. The resistive touch panel according to claim 1,
Of the two multilayer materials, the transparent conductive layer of the second multilayer material disposed opposite to the first multilayer material is formed of a material mainly composed of carbon nanotubes,
The transparent base material of the second multilayer material is formed of one material of polyethylene terephthalate, polycarbonate, polymethyl methacrylate resin, cyclic olefin polymer, silicate glass,
Resistive touch panel. The resistive touch panel according to claim 1 or 2,
The carbon nanotube is a double-walled carbon nanotube or a multi-walled carbon nanotube,
Resistive touch panel. The resistive touch panel according to any one of claims 1 to 3,
The transparent conductive layers of the two multilayer materials are formed of the same material, and the transparent substrates of the two multilayer materials are formed of the same material,
Resistive touch panel. The resistive touch panel according to any one of claims 1 to 4,
A touch panel drive circuit for driving the resistive touch panel;
A liquid crystal panel disposed on the opposite side of the first multilayer material with respect to the second multilayer material disposed opposite to the first multilayer material among the two multilayer materials ,
A liquid crystal panel driving circuit for driving the liquid crystal panel;
A backlight that emits light to the liquid crystal panel;
A backlight driving circuit for driving the backlight;
Touch panel display equipped with. The touch panel display according to claim 5,
The backlight drive circuit drives the backlight so that the maximum luminance of the B component among the light components emitted from the backlight is 165% or less of the maximum luminance of the R component.
Touch panel display. The touch panel display according to claim 5,
The backlight drive circuit is configured such that, among the light components emitted from the backlight, the highest luminance of the B component is equal to or lower than a luminance obtained by adding the luminance of half of the highest luminance of the G component to the highest luminance of the G component. Drive the backlight,
Touch panel display. The touch panel display according to claim 5,
The backlight driving circuit drives the backlight so that the luminance of the B component among the light components emitted from the backlight is equal to or lower than the luminance of the G component.
Touch panel display. A preparation step of preparing two multilayer materials having a transparent substrate and a transparent conductive layer in contact with the transparent substrate;
An arrangement step of fixing the relative positions of the two multilayer materials by arranging the two multilayer materials facing each other so that the transparent conductive layers of the two multilayer materials are opposed to each other with a space therebetween. ,
Run
In the preparation step, the transparent conductive layer is formed of a material mainly composed of carbon nanotubes as a first multilayer material pushed by the operator to the other multilayer material side of the two multilayer materials. The transparent substrate is prepared from one material of polyethylene terephthalate, polycarbonate, polymethyl methacrylate resin, cyclic olefin polymer, silicate glass,
A method for manufacturing a resistive touch panel.

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