JP2023126988A - display unit - Google Patents

Abstract

To provide a technology that further improves antiglare capability.SOLUTION: A display unit 1 comprises a display 2 and an antiglare layer 3. The antiglare layer 3 includes a first principal plane 3a that includes surface irregularities and a second principal plane 3b that is reverse from the first principal surface 3a, with the second principal plane 3b stacked on top of the display 2 facing the display 2. Of the antiglare layer 3, the difference ΔRb (ΔRb=Rb20°-Rb45°) between a 20° reflection image diffusibility index value Rb20° and a 45° reflection image diffusibility index value Rb45° is 0.05 or greater. The internal reflection rate R_int of the display 2 is 3.0% or smaller.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to display units.

When surrounding objects or lighting are reflected on the surface of the display, the visibility of the image decreases. Therefore, an anti-glare layer is provided on the surface of the display (see, for example, Patent Documents 1 to 3). The anti-glare layer is a glass substrate subjected to an anti-glare treatment, and is provided with irregularities. The anti-glare treatment includes, for example, at least one selected from frost treatment, etching treatment, and blast treatment on the surface of the glass substrate, or application of a coating liquid to the glass substrate and baking.

JP 2016-6498 Publication Japanese Patent Application Publication No. 2019-144475 JP 2019-123652 Publication

The anti-glare layer has unevenness. The unevenness can disperse the direction of light reflection and suppress reflections of surrounding objects or lighting.

One aspect of the present disclosure provides a technology that further improves anti-glare properties.

A display unit according to one aspect of the present disclosure includes a display and an anti-glare layer. The anti-glare layer includes a first main surface including unevenness and a second main surface opposite to the first main surface, and is laminated on the display with the second main surface facing the display. Ru. In the anti-glare layer, the difference ΔRb (ΔRb=Rb20°−Rb45°) between the 20° reflection image diffusivity index value Rb20° and the 45° reflection image diffusivity index value Rb45° is 0.05 or more. The display has an internal reflectance R_int of 3.0% or less.

According to one aspect of the present disclosure, antiglare properties can be further improved.

FIG. 1 is a sectional view of a display unit according to an embodiment. FIG. 2 is a sectional view of a display unit according to a modification.

Embodiments of the present disclosure will be described below with reference to the drawings. Note that in each drawing, the same or corresponding configurations are denoted by the same reference numerals, and the description thereof may be omitted. Furthermore, in the specification, "~" indicating a numerical range means that the numerical values written before and after it are included as lower and upper limits.

A display unit 1 according to this embodiment will be described with reference to FIG. 1. The display unit 1 is for example mounted on a vehicle. However, the use of the display unit 1 is not particularly limited.

The display unit 1 includes, for example, a display 2 and an anti-glare layer 3. The display 2 and the anti-glare layer 3 are bonded together with an adhesive layer such as OCA (Optical Clear Adhesive).

First, the display 2 will be explained. The display 2 is, for example, a liquid crystal display. The display 2 includes, from the anti-glare layer 3 side, a touch sensor 21, a first polarizer 22, a color filter substrate 23, a liquid crystal layer 24, a TFT substrate 25, a second polarizer 26, and a backlight 27. , in this order.

The touch sensor 21 detects the proximity of an object such as a finger to the screen of the display 2. When the display unit 1 is mounted on a vehicle, the touch sensor 21 receives operations from a vehicle occupant. Note that the touch sensor 21 has an arbitrary configuration, and the display 2 does not need to include the touch sensor 21.

The first polarizer 22 and the second polarizer 26 are each linear polarizers. These two linear polarizers are arranged with their absorption axes shifted by 90°. A color filter substrate 23, a liquid crystal layer 24, and a TFT substrate 25 are arranged between the first polarizer 22 and the second polarizer 26.

Although not shown, the color filter substrate 23 includes, for example, a glass substrate, a color filter, a common electrode, and an alignment film in this order from the first polarizer 22 to the liquid crystal layer 24. The alignment film aligns liquid crystal molecules in the liquid crystal layer 24.

Although not shown, the TFT substrate 25 includes, for example, a glass substrate, a pixel electrode, and an alignment film in this order from the second polarizer 26 toward the liquid crystal layer 24. The alignment film aligns liquid crystal molecules in the liquid crystal layer 24. The TFT substrate 25 further includes a TFT as a driving element that drives the pixel electrode.

The liquid crystal layer 24 is arranged between the color filter substrate 23 and the TFT substrate 25. A voltage is applied to the liquid crystal layer 24 for each pixel. Application of voltage changes the direction of the liquid crystal molecules, changing the brightness of the pixel.

The backlight 27 irradiates light onto the liquid crystal layer 24 via the second polarizer 26 and the TFT substrate 25. The light passes through the color filter substrate 23, the first polarizer 22, the touch sensor 21, and the anti-glare layer 3, and is emitted.

Note that the display 2 may further include functional layers other than those described above. For example, the display 2 may further include an adhesive layer. The adhesive layer bonds adjacent layers together.

The display 2 has an internal reflectance R_int of 3.0% or less. The specific method for measuring R_int is as follows. R_dip is the luminous reflectance measured on the main surface 2a of the display 2 on which the anti-glare layer 3 is formed under the geometric condition d (8°: di) in accordance with JIS Z8722:2009. In addition, with the top layer closest to the anti-glare layer 3 of the display 2 peeled off and a black film applied to the peeled surface of the top layer, JIS Let R_surf be the luminous reflectance measured under the geometric condition d (8°: di) in accordance with Z8722:2009. R_dip and R_surf are measured using, for example, a spectrometer U-4100 manufactured by Hitachi High-Tech Science. R_int is calculated using the following formula (1).
R_int=R_dip-R_surf...(1)
The top layer of the display 2 is the touch sensor 21 in FIG. Note that when there is no touch sensor 21, the top layer of the display 2 is the first polarizer 22.

The reason why R_surf is subtracted from R_dip is that when measuring R_dip, the anti-glare layer 3 is removed from the display 2 and the top layer of the display 2 is in contact with the air. In other words, R_Surf is subtracted from R_dip because R_dip includes reflection at the interface between the top layer of the display 2 and air.

In the display unit 1, an anti-glare layer 3 is laminated on the top layer of the display 2. The refractive index difference between the anti-glare layer 3 and the top layer is smaller than the refractive index difference between the air layer and the top layer. Therefore, the reflection of light at the interface between the anti-glare layer 3 and the top layer is negligibly small compared to the reflection of light at the interface between the air layer and the top layer. Therefore, R_surf is subtracted from R_dip to eliminate the influence of light reflection at the interface between the top layer of the display 2 and air.

R_int is, for example, 3.0% or less, preferably 1.0% or less, more preferably 0.5% or less, still more preferably 0.3% or less. When R_int is 3.0% or less, regular reflection between adjacent layers constituting the display 2 can be suppressed, and reflection of surrounding objects, lighting, etc. due to the regular reflection can be suppressed. R_int is 0.0% or more.

Through experiments and the like, the present inventor has determined that the anti-glare properties of the display unit 1 can be improved by combining a display 2 with an R_int of 3.0% or less and an anti-glare layer 3 with a ΔRb of 0.05 or more, which will be described later. I found something that could be improved. Note that even if R_int is 3.0% or less, if ΔRb is less than 0.05, the anti-glare property of the display unit 1 will not be sufficiently improved.

The anti-glare property of the display unit 1 is expressed by an anti-glare property index value R20°. R20° is measured using a variable angle photometer GC-5000L manufactured by Nippon Denshoku Industries. The method for measuring R20° is as follows. Light is irradiated onto the first main surface 3a of the anti-glare layer 3, and the brightness of the reflected light is detected by a detector. When the angle φ in the direction parallel to the thickness direction of the anti-glare layer 3 is 0°, light is irradiated at an angle of φ=20°. If the brightness of the specularly reflected light detected at φ=-20° is R20°_1, and the total value of the brightness of the reflected light detected in the entire range of φ=-50° to +10° is R20°_2, then the following R20° is calculated by the formula.
R20°=(R20°_2-R20°_1)/(R20°_2)
Here, the detector is rotated in 1° increments within the same plane around the light irradiation point on the first main surface 3a of the anti-glare layer 3, and detects the brightness in 1° increments. The rotation angle of the detector is the above angle φ.

The antiglare index value R20° is, for example, 0.6 or more and less than 1.0, preferably 0.8 or more and less than 1.0. If the anti-glare index value R20° is 0.6 or more, it is possible to suppress reflections of surrounding objects or lighting on the display unit 1.

Next, the anti-glare layer 3 will be explained. The anti-glare layer 3 includes a first main surface 3a including unevenness and a second main surface 3b opposite to the first main surface 3a, and is arranged above the display 2 with the second main surface 3b facing the display 2. Laminated on. The anti-glare layer 3 is a so-called cover glass. The anti-glare layer 3 is a glass substrate, and the glass substrate includes irregularities.

The unevenness is formed by, for example, at least one selected from frost treatment, etching treatment, and blast treatment on the surface of the glass substrate. The unevenness can disperse the direction of light reflection and suppress reflections of surrounding objects or lighting. The unevenness is formed on the first main surface 3a and not on the second main surface 3b. The second main surface 3b is protected by a mask when forming irregularities on the first main surface 3a. However, the unevenness may also be formed on the second main surface 3b.

Note that the anti-glare layer 3 of this embodiment is a glass substrate, and the glass substrate includes irregularities, but the anti-glare layer 3 includes a glass substrate and a coating layer, and the coating layer may also include irregularities. Irregularities are formed by applying and baking the coating liquid. Hereinafter, the glass substrate of the anti-glare layer 3 will also be simply referred to as a glass substrate.

The glass substrate is formed by a float method, a fusion method, a down-draw method, or the like. The glass substrate may be bent. Further, the glass substrate may be tempered glass. The tempered glass is air-cooled tempered glass or chemically strengthened glass.

The thickness of the glass substrate is, for example, 0.05 mm to 3 mm. If the glass substrate is made of tempered glass, the strength of the glass substrate can be ensured while reducing the thickness of the glass substrate. The glass of the glass substrate is, for example, soda lime glass, borosilicate glass, aluminosilicate glass, or alkali-free glass. Among these, aluminosilicate glass is preferred.

Note that the anti-glare layer 3 may include a resin substrate instead of or in addition to the glass substrate. A resin substrate has excellent flexibility.

In the anti-glare layer 3, the difference ΔRb (ΔRb=Rb20°−Rb45°) between the 20° reflection image diffusivity index value Rb20° and the 45° reflection image diffusivity index value Rb45° is 0.05 or more. ΔRb is measured using a variable angle photometer GC-5000L manufactured by Nippon Denshoku Industries. The method for measuring ΔRb is the same as that described in Patent Document 1, and specifically as follows.

First, a method for measuring Rb20° will be explained. In the measurement of Rb20°, unlike the measurement of R20°, the antiglare layer 3 is measured alone, and a black film is applied to the second main surface 3b of the antiglare layer 3. In this state, light is irradiated onto the first main surface 3a of the anti-glare layer 3, and the brightness of the reflected light is detected by a detector. When the angle φ in the direction parallel to the thickness direction of the anti-glare layer 3 is 0°, light is irradiated at an angle of φ=20°. If the brightness of the specularly reflected light detected at φ=-20° is Rb20°_1, and the total value of the brightness of the reflected light detected in the entire range of φ=-50° to +10° is Rb20°_2, then the following Rb20° is calculated by equation (2).
Rb20°=(Rb20°_2-Rb20°_1)/(Rb20°_2)...(2)
Here, the detector is rotated in 1° increments within the same plane around the light irradiation point on the first main surface 3a of the anti-glare layer 3, and detects the brightness in 1° increments. The rotation angle of the detector is the above angle φ.

Next, a method for measuring Rb45° will be explained. With the black film applied to the second main surface 3b of the anti-glare layer 3, light is irradiated onto the first main surface 3a of the anti-glare layer 3, and the brightness of the reflected light is detected by a detector. When the angle φ in the direction parallel to the thickness direction of the anti-glare layer 3 is 0°, light is irradiated at an angle of φ=45°. If the brightness of the specularly reflected light detected at φ=-45° is Rb45°_1, and the total value of the brightness of the reflected light detected in the entire range of φ=-75° to -15° is Rb45°_2, Rb45° is calculated by the following formula (3).
Rb45°=(Rb45°_2-Rb45°_1)/(Rb45°_2)...(3)
Here, the detector is rotated in 1° increments within the same plane around the light irradiation point on the first main surface 3a of the anti-glare layer 3, and detects the brightness in 1° increments. The rotation angle of the detector is the above angle φ.

ΔRb is, for example, 0.05 to 0.25, preferably 0.07 to 0.20. If ΔRb is 0.05 or more, an antiglare layer 3 excellent in both transmitted image clarity and Sparkle performance can be obtained. The clarity of the transmitted image is expressed by the clarity index value C below. Further, the Sparkle performance is expressed by the glare index value S below.

The antiglare layer 3 has a sharpness index value C of 0.7 or more. C is measured using a variable angle photometer GC-5000L manufactured by Nippon Denshoku Industries. The method for measuring C is the same as the method for measuring "Clarity" described in Patent Document 2, and specifically as follows. Note that when measuring C, unlike when measuring Rb20°, a black film is not applied to the second main surface 3b of the anti-glare layer 3. First, the second main surface 3b of the anti-glare layer 3 is irradiated with light from a light source placed opposite to the second main surface 3b of the anti-glare layer 3 in a direction parallel to the thickness direction of the anti-glare layer 3, A detector detects the brightness of the transmitted light. The angle θ in the direction parallel to the thickness direction of the anti-glare layer 3 is 0°. When the brightness of transmitted light detected at θ=0° is C1, and the total value of the brightness of transmitted light detected in the entire range of θ=-90° to 90° is C2, the following formula (4) is used. C is calculated by
C=C1/C2...(4)
Here, the detector is rotated in 1° increments within the same plane around the light irradiation point on the second main surface 3b of the anti-glare layer 3, and detects the brightness in 1° increments. The rotation angle of the detector is the above angle θ.

C is, for example, 0.7 or more and less than 1.0, preferably 0.9 or more and less than 1.0. If C is 0.7 or more, the transmitted image clarity is good.

The antiglare layer 3 has a glare index value S of less than 8%. The method for measuring S is similar to the method described in Patent Documents 2 and 3, and specifically as follows. On the light emitting surface of the backlight, a Pixel Pattern attached to SMS-1000 manufactured by D&MS is placed as a photomask with its pattern surface facing upward. A 0.5 mm thick glass plate (for example, soda lime glass plate manufactured by AGC) is placed on the patterned surface of the photomask, and an anti-glare layer 3 is placed on top of it, with its first principal surface 3a facing upward. and install it. By installing the photomask on the light emitting surface of a backlight whose light emission color is green, a monochromatic green image display composed of RGB (0,255,0) was simulated. A 190 dpi area of the patterned surface of the photomask is imaged through the anti-glare layer 3 by the camera of the apparatus SMS-1000. The Sparkle value obtained by image analysis of the evaluation device is S. Here, measurement is performed in DIM (Difference Image Method) mode. The distance between the image sensor of the camera and the anti-glare layer 3 is 540 mm. The camera lens used is a 23FM50SP lens with a focal length of 50 mm and an aperture of 16.

S is, for example, 0% or more and less than 8%, preferably 0% or more and less than 5%, more preferably less than 4%, and still more preferably less than 3%. If S is less than 8%, glare will be suppressed.

The antiglare layer 3 has a haze value of 10% to 30%. The haze value is measured using a commercially available measuring device. The measurement device and measurement conditions are as follows, for example.
Measuring device: Suga Test Instruments Haze Meter HZ-V3
Measurement conditions: Measured using C light source in accordance with Japanese Industrial Standards (JIS K 7136:2000).

The haze value is, for example, 5% to 30%, preferably 5% to 20%, more preferably 5 to 15%, even more preferably 5 to 10%. If the haze value is 30% or less, the clarity of the transmitted image is good.

Next, with reference to FIG. 2, a display unit 1 according to a modification will be described. The differences will be mainly explained below. The display 2 of this modification is not a liquid crystal display but an organic EL display. The display 2 includes, in this order from the anti-glare layer 3 side, a touch sensor 41, a circular polarizer 42, a first substrate 43, a light emitting layer 44, and a second substrate 45.

The touch sensor 41 is the same as the touch sensor 21 of the embodiment described above, so a description thereof will be omitted.

The circular polarizer 42 suppresses reflection of external light. The circular polarizer 42 includes, for example, a linear polarizer and a quarter wavelength film. Note that the circular polarizer 42 has an arbitrary configuration, and the display 2 does not need to include the circular polarizer 42.

The first substrate 43 includes, for example, a glass substrate or a resin substrate and a transparent electrode. Light generated in the light emitting layer 44 is transmitted through the transparent electrode.

The light emitting layer 44 includes, for example, a red light emitting layer, a green light emitting layer, and a blue light emitting layer. Note that the light emitting layer 44 may include a white light emitting layer. A white light emitting layer is used in combination with a color filter. A voltage is applied to the light emitting layer 44 for each pixel. By applying a voltage, the light emitting layer 44 emits light.

The second substrate 45 includes, for example, a glass substrate or a resin substrate and a reflective electrode. The light generated in the light emitting layer 44 is reflected by the reflective electrode and transmitted through the light emitting layer 44 and the transparent electrode.

Note that the display 2 is not limited to the structure shown in FIG. 2. The light extraction method of the display 2 may be either a top emission method or a bottom emission method. Furthermore, between the first substrate 43 and the light emitting layer 44 or between the second substrate 45 and the light emitting layer 44, various functions such as a hole injection layer, a hole transport layer, an electron transport layer, or an electron injection layer are provided. Layers may be arranged.

The top layer of the display 2 is the touch sensor 41 in FIG. Note that when there is no touch sensor 41, the top layer of the display 2 is the circular polarizer 42. If there is also no circular polarizer 42, the top layer of the display 2 is the first substrate 43.

Also in this modification, as in the above embodiment, by combining the display 2 with R_int of 3.0% or less and the anti-glare layer 3 with ΔRb of 0.05 or more, the display unit 1 can be prevented from glare. You can improve your sexuality. Note that even if R_int is 3.0% or less, if ΔRb is less than 0.05, the anti-glare property of the display unit 1 will not be sufficiently improved.

Also in this modification, the anti-glare layer 3 has a haze value of 10% to 30%, similar to the above embodiment. Further, the anti-glare layer 3 has a sharpness index value C of 0.7 or more. Furthermore, the anti-glare layer 3 has a glare index value S of less than 8%.

Examples 1 to 5 and Comparative Examples 1 to 3 will be described below.

[Example 1]
The first main surface of a glass substrate (manufactured by AGC, soda lime glass plate: 100 mm x 100 mm x 0.7 mm) was subjected to an anti-glare treatment to obtain an anti-glare layer. As anti-glare treatment, frost treatment and etching treatment were performed in this order. A masking film (SPV-3620 manufactured by Nitto Denko Corporation) was attached to the second main surface of the glass substrate before frosting. The mask film was removed after the etching process.

The treatment conditions for the frost treatment were as follows.
・Frost treatment liquid (aqueous solution containing 2 wt% HF and 3 wt% KF)
・Immersion time in frost treatment solution: 3 [min]
After the frost treatment and before the etching treatment, the glass substrate was cleaned.

The processing conditions for the etching treatment were as follows.
・Etching treatment liquid (aqueous solution containing 7.5 wt% HF and 7.5 wt% HCl)
- Immersion time in etching treatment solution: 18 [min].

As a simulated display combined with the anti-glare layer (a simulated display used when measuring R20°), a glass substrate different from the glass substrate of the anti-glare layer (manufactured by AGC, Dragontrail: 100 mm x 100 mm x 0.7 mm) was used. ), a titanium oxide film, and a polarizing film (manufactured by Nitto Denko Corporation, NPF) were laminated in this order to produce a laminate. Of the two main surfaces of this laminate, the main surface on the glass substrate side was coated with a black film. The black film was formed using a black marker (Mitsubishi Pencil Co., Ltd., paint marker, PX-30 (black)). The titanium oxide film was formed on a glass substrate by a sputtering method.

The polarizing film and anti-glare layer of the simulated display were placed facing each other, and the polarizing film and anti-glare layer were adhered with OCA (manufactured by Taica, OPTαGEL, K120E, 0.2 mm thick), and the display for R20° measurement was prepared. A unit was created.

[Examples 2-3, Comparative Example 1]
In Examples 2 to 3 and Comparative Example 1, anti-glare layers were produced under the same conditions as in Example 1.

In Examples 2 and 3, a simulated display combined with an anti-glare layer was produced under the same conditions except that the thickness of the titanium oxide film was changed in order to change the internal reflectance R_int. Specifically, in Example 2, the thickness of the titanium oxide film was 10.5 nm. Furthermore, in Example 3, a titanium oxide film was not formed on the glass substrate, and the glass substrate and the polarizing film were laminated without interposing the titanium oxide film.

In Comparative Example 1, in order to change the internal reflectance R_int, a simulated display combined with an anti-glare layer was created without forming a titanium oxide film on the glass substrate or by forming a titanium oxide film on the glass substrate without intervening the titanium oxide film. A polarizing film was laminated, and a black film was not applied to the main surface of the laminate on the glass substrate side.

[Examples 4-5, Comparative Examples 2-3]
In Examples 4 to 5 and Comparative Examples 2 to 3, the anti-glare layer was produced under the same conditions as in Example 1, except that the treatment conditions for the anti-glare treatment were changed in order to change the uneven shape.

In Examples 4 to 5 and Comparative Examples 2 to 3, a simulated display combined with an anti-glare layer was produced under the same conditions as in Example 1.

[evaluation]
<ΔRb>
ΔRb of each anti-glare layer was measured as described above.

<Clearness index value C>
The sharpness index value C of each anti-glare layer was measured as described above. C was evaluated as "good" when it was 0.9 or more, "fair" when it was 0.7 or more and less than 0.9, and "poor" when it was less than 0.7. "Good" and "Acceptable" are passes, and "Unsatisfactory" is a fail.

<Haze value>
The haze value of each anti-glare layer was measured as described above.

<Internal reflectance R_int>
The internal reflectance R_int of each display was measured as described above. Note that R_surf is the same as the polarizing film used in the simulated display, and with a black film applied to one side of the prepared polarizing film, the geometric condition d (8 The luminous reflectance was measured at °:di). The black film was formed using a black marker (Mitsubishi Pencil Co., Ltd., paint marker, PX-30 (black)).

<Anti-glare index value R20°>
The anti-glare index value R20° of each display unit was measured as described above. R20° was evaluated as "good" when it was 0.8 or more, "fair" when it was 0.6 or more and less than 0.8, and "poor" when it was less than 0.6. "Good" and "Acceptable" are passes, and "Unsatisfactory" is a fail.

<Glare index value S>
In order to measure the glare index value S of each anti-glare layer, a simulated display unit including an anti-glare layer, a glass plate, a photomask, and a backlight in this order was produced. As the backlight, TMN150X180-22GD-4 manufactured by ITEC Systems was used. The method for measuring the glare index value S is as described above.

Regarding the glare index value S, a value of 0% or more and less than 8% was evaluated as "good", and a value of 8% or more was evaluated as "unsatisfactory". “Good” means a pass, and “unsatisfactory” means a failure.

<Evaluation results>
Table 1 shows the evaluation results.

実施例１と比較例１とを比較すれば明らかなように、Ｒ＿ｉｎｔが３．０％以下であるディスプレイと、ΔＲｂが０．０５以上である防眩層とを組み合わせることで、ディスプレイユニットの防眩性指標値Ｒ２０°が良好になることが分かる。また、比較例２～３から、Ｒ＿ｉｎｔが３．０％以下であっても、ΔＲｂが０．０５未満であれば、ディスプレイユニットの防眩性指標値Ｒ２０°が不良になることが分かる。更に、実施例１～３から、ΔＲｂが０．０５以上であれば、Ｒ＿ｉｎｔが小さいほど、Ｒ２０°が大きく、防眩性に優れたディスプレイユニットが得られることが分かる。

As is clear from a comparison between Example 1 and Comparative Example 1, by combining a display with an R_int of 3.0% or less and an anti-glare layer with a ΔRb of 0.05 or more, the display unit can be effectively prevented. It can be seen that the glare index value R20° becomes good. Further, from Comparative Examples 2 and 3, it can be seen that even if R_int is 3.0% or less, if ΔRb is less than 0.05, the anti-glare index value R20° of the display unit becomes poor. Further, from Examples 1 to 3, it can be seen that when ΔRb is 0.05 or more, the smaller R_int is, the larger R20° is, and a display unit with excellent anti-glare properties can be obtained.

Although the display unit according to the present disclosure has been described above, the present disclosure is not limited to the above embodiments. Various changes, modifications, substitutions, additions, deletions, and combinations are possible within the scope of the claims. These naturally fall within the technical scope of the present disclosure.

1 Display unit 2 Display 24 Liquid crystal layer 3 Anti-glare layer 3a First main surface 3b Second main surface

Claims (7)

A display unit comprising a display and an anti-glare layer,
The anti-glare layer includes a first main surface including unevenness and a second main surface opposite to the first main surface, and is laminated on the display with the second main surface facing the display. ,
The anti-glare layer has a difference ΔRb (ΔRb=Rb20°−Rb45°) between the following 20° reflected image diffusivity index value Rb20° and the following 45° reflected image diffusive index value Rb45° of 0.05 or more. can be,
The display is a display unit in which the following internal reflectance R_int is 3.0% or less.
Internal reflectance R_int: R_dip is the luminous reflectance measured under geometric condition d (8°: di) in accordance with JIS Z8722:2009 with respect to the main surface on which the anti-glare layer of the display is formed. do. Further, the top layer closest to the anti-glare layer of the display is peeled off, and a black film is applied to the peeled surface of the top layer, and the main surface of the top layer on which the anti-glare layer is formed is The luminous reflectance measured under the geometric condition d (8°: di) in accordance with JIS Z8722:2009 is defined as R_surf. R_int is calculated using the following formula (1).
R_int=R_dip-R_surf...(1)
20° reflection image diffusivity index value Rb20°: Using a variable angle photometer GC-5000L manufactured by Nippon Denshoku Kogyo Co., Ltd., with a black film applied to the second main surface of the antiglare layer, the antiglare Light is irradiated onto the first principal surface of the layer, and the brightness of the reflected light is detected by a detector. When the angle φ in the direction parallel to the thickness direction of the anti-glare layer is 0°, light is irradiated at an angle of φ=20°. If the brightness of the specularly reflected light detected at φ=-20° is Rb20°_1, and the total value of the brightness of the reflected light detected in the entire range of φ=-50° to +10° is Rb20°_2, then the following Rb20° is calculated by equation (2).
Rb20°=(Rb20°_2-Rb20°_1)/(Rb20°_2)...(2)
45° reflection image diffusivity index value Rb45°: Using a variable angle photometer GC-5000L manufactured by Nippon Denshoku Kogyo Co., Ltd., with a black film applied to the second main surface of the antiglare layer, the antiglare Light is irradiated onto the first principal surface of the layer, and the brightness of the reflected light is detected by a detector. When the angle φ in the direction parallel to the thickness direction of the anti-glare layer is 0°, light is irradiated at an angle φ=45°. If the brightness of the specularly reflected light detected at φ=-45° is Rb45°_1, and the total value of the brightness of the reflected light detected in the entire range of φ=-75° to -15° is Rb45°_2, Rb45° is calculated by the following formula (3).
Rb45°=(Rb45°_2-Rb45°_1)/(Rb45°_2)...(3) The display unit according to claim 1, wherein the anti-glare layer has a haze value of 5% to 30%. The display unit according to claim 1 or 2, wherein the anti-glare layer has a sharpness index value C below of 0.7 or more.
Visibility index value C: Using a variable angle photometer GC-5000L manufactured by Nippon Denshoku Kogyo Co., Ltd., from a light source placed opposite to the second main surface of the anti-glare layer, the thickness direction of the anti-glare layer and Light is irradiated onto the second main surface of the anti-glare layer in parallel directions, and the brightness of the transmitted light is detected by a detector. The angle θ in a direction parallel to the thickness direction of the anti-glare layer is 0°. When the brightness of transmitted light detected at θ=0° is C1, and the total value of the brightness of transmitted light detected in the entire range of θ=-90° to 90° is C2, the following formula (4) is used. C is calculated by
C=C1/C2...(4) The display unit according to any one of claims 1 to 3, wherein the anti-glare layer is a glass substrate, and the glass substrate includes the unevenness. The display unit according to claim 1, wherein the anti-glare layer includes a glass substrate and a coating layer, and the coating layer includes the unevenness. The display unit according to claim 4 or 5, wherein the glass substrate is aluminosilicate glass. The display unit according to any one of claims 1 to 6, wherein the display unit is for use in a vehicle.

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