Method for estimating blind level and method for producing blind space

Abstract

To provide a method for estimating the blind level of a space that is blinded by viewing a display placed inside through a polarizing blind film.SOLUTION: Provided is a method for estimating a blind level of a space partitioned by a partition to which a polarizing blind film including a polarizer is attached, the space being blinded by a display placed therein being viewed through the polarizing blind film, the method including: calculating a predicted value of the blind level when the display is observed from outside the partition based on the following formula (1): Y=10^(2.27×10-2×X1+2.41×10-4×X2-6.19×10-1) (Y is the predicted value of the blind level (%), X1 is the angle (°) between a vertical plane including the front direction of the display and a vertical plane including the observation direction, and X2 is the height of the observation point (mm)).SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a method for estimating a blind level and a method for producing a blind space. [Background technology]

[0002] In recent years, designs that create a sense of spatial openness in work spaces such as conference rooms and individual work booths have become widespread. For example, many work spaces that create a sense of openness by constructing some or all of the partitions that separate the space from transparent materials such as glass panels or acrylic panels have been designed and constructed. In many cases, notebook personal computers (PCs) or tablet devices are brought into such work spaces. While such work spaces create a sense of openness, there are cases in which a third party may be able to peek at the information displayed on the display of a notebook PC or other device brought into the work space, which can be a problem.

[0003] On the other hand, the light emitted from the display of a notebook PC or the like is often linearly polarized light. Therefore, as a method for solving the problem of peeping, for example, Patent Document 1 proposes placing a partition equipped with a polarizing film arranged so that the polarization direction of the emitted light and the absorption axis direction are parallel between the display and a third party, thereby making it impossible to see the information displayed on the display from the outside (hereinafter, making the information displayed on the display invisible may be referred to as "blinding (the display)" or "blind function"). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] U.S. Patent No. 6,552,850 Summary of the Invention [Problem to be solved by the invention]

[0005] In a space where polarized blind film is applied, the blind function may be weak in some places, making it possible for information displayed on the display to be visible from outside the space; this problem is more pronounced in small spaces for personal use or for a small number of people (hereinafter, the situation where information displayed on the display can be seen from outside a space where polarized blind film is applied may be referred to as "the blind being removed").

[0006] The present invention has been made to solve the above-mentioned problems in the conventional art, and its main objective is to provide a method for estimating the blind level of a space that is blinded by viewing a display placed inside through a polarized blind film. [Means for solving the problem]

[0007] The inventors discovered that the height of the observation point (viewpoint) and the observation angle relative to the display have a large impact on the blind function at that observation point, and came up with the idea that the blind level at any observation point can be predicted based on this, which led to the completion of the present invention.

[0008] [1] According to one aspect of the present invention, there is provided a method for estimating a blind level of a space partitioned by a partition to which a polarizing blind film including a polarizer is attached, the method comprising the steps of: calculating a predicted blind level when the display is viewed from outside the partition based on formula (1): Formula (1): Y = 10^(2.27×10 -2 ×X1 ten 2.41×10 -4 xX2-6.19x10 -1 ) (In the formula, Y represents the predicted value (%) of the blind level, X1 represents the angle (°) between a vertical plane including the front direction of the display and a vertical plane including the observation direction, and X2 represents the height of the observation point (mm).) [2] The method according to [1] above may further include estimating, as an unblinded portion, an observation portion where the predicted value of the blind level does not satisfy a predetermined reference value. [3] In the method according to [1] or [2] above, the space may have a width of 3000 mm or less, a depth of 3000 mm or less, and a height of 3000 mm or less. [4] According to another aspect of the present invention, there is provided a method for producing a blind space, comprising the steps of: estimating a blind elimination point in a space partitioned by a partition to which a polarized blind film containing a polarizer is attached, the space being blinded by viewing a display placed inside the partition through the polarized blind film; and compensating for the blind function of the blind elimination point by the method described in [2] above. [5] In the method according to [4] above, compensating for the blind function may be performed by covering the blind cancellation area with a non-transparent or semi-transparent material, by placing a non-transparent or semi-transparent partition between the display and the blind cancellation area, or by mosaic-toning the blind cancellation area. [6] According to yet another aspect of the present invention, there is provided a method for predicting luminance information, comprising: (i) measuring the luminance of a display placed inside a space partitioned by a partition to which a polarizing blind film including a polarizer is attached, from a plurality of measurement points outside the partition; (ii) applying machine learning to a space based on the luminance of the display measured at the plurality of measurement points as a dependent variable, and to a space including a front direction of the display and an angle between a vertical plane including the measurement direction and a vertical plane including the measurement direction, and a height of the measurement points as explanatory variables, thereby obtaining a prediction formula for predicting the luminance information at an arbitrary point outside the partition; and (iii) predicting the luminance information at the prediction target point by substituting the explanatory variables at the prediction target point into the prediction formula. Effect of the Invention

[0009] According to an embodiment of the present invention, it is possible to predict the blind level when the display is observed from an arbitrary observation point outside the partition, based on the height of the observation point and the observation angle with respect to the display. Also, according to an embodiment of the present invention, it is possible to estimate the blind removal point based on the prediction. [Brief description of the drawings]

[0010] [Figure 1] 1 is a schematic diagram illustrating a configuration of a surface light source device. [Diagram 2] 1A and 1B are a schematic plan view and a schematic side view, respectively, for explaining the measurement of luminance of the emission surface of a surface light source device. [Diagram 3] 1A and 1B are a schematic plan view and a schematic side view, respectively, for explaining the measurement of luminance of the emission surface of a surface light source device. [Figure 4] FIG. 2 is a schematic plan view illustrating the measurement of luminance of the exit surface of the surface light source device. [Diagram 5] FIG. 2 is a schematic plan view illustrating the measurement of luminance of the exit surface of the surface light source device. [Figure 6]13A is a plot of predicted values ​​based on equation (1a) and actual values, and FIG. 13B is a plot of predicted values ​​based on equation (1) and actual values. [Figure 7] FIG. 1 is a schematic diagram illustrating one embodiment of the present invention. [Figure 8] FIG. 1 is a schematic diagram illustrating one embodiment of the present invention. [Figure 9] 1 is a schematic cross-sectional view illustrating the configuration of a polarizing blind film that can be used to create a blind space. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Representative embodiments of the present invention will be described below, but the present invention is not limited to these embodiments. Each embodiment can be appropriately combined unless it is obviously inappropriate. For ease of viewing, the drawings are shown diagrammatically, and the thickness and size of each component in the drawings and the ratio of thickness between components are different from the actual ones.

[0012] A. Blind level estimation method According to an embodiment of the present invention, there is provided a method for estimating a blind level of a space partitioned by a partition to which a polarizing blind film including a polarizer is attached, and a display placed therein is blinded by being viewed through the polarizing blind film. The method for estimating the blind level according to the embodiment of the present invention includes calculating a predicted value of the blind level when the display is observed from outside the partition based on the following formula (1). Formula (1): Y = 10^(2.27×10 -2 ×X1 ten 2.41×10 -4 xX2-6.19x10 -1 ) (In the formula, Y represents the predicted value (%) of the blind level, X1 represents the angle (°) between the vertical plane including the front direction of the display and the vertical plane including the observation direction, and X2 represents the height (mm) of the observation point.)

[0013] Formula (1) will be explained below. Fig. 1 is a schematic diagram for explaining a surface light source device as a substitute for a display placed inside the above-mentioned space, and Figs. 2 to 5 are schematic diagrams for explaining the luminance measurement thereof. As shown in Fig. 1, the surface light source device 10 has a rectangular emission surface of 300 mm length x 400 mm width, and is equipped with a total of five light sources L1 to L5 arranged at the four corners and the center on the back side of the emission surface. The surface light source device 10 emits linearly polarized light from the emission surface.

[0014] 2(a) and (b) are a schematic plan view and a schematic side view, respectively, for explaining the luminance measurement of the surface light source device. As shown in FIG. 2(b), the surface light source device 10 was placed on a workbench T at an angle of 10° so that the height of its center C was 800 mm and the angle of the emission surface with respect to the horizontal plane was 100°. Next, the luminance of the surface light source device 10 was measured from a total of six observation points, including three points at a distance of 1000 mm from the center C of the emission surface of the surface light source device 10, with different angles relative to the vertical plane including the front direction of the emission surface, and three points at different heights from these three points. Specifically, as shown in Figs. 2(a) and (b), the observation points were three points (points 2, 4, and 6; all points 800 mm high) that were at the same height as the center C of the emission surface of the surface light source device 10, 1000 mm away from the center C, and had angles of 0°, 45°, or 75° with the front direction of the emission surface (in other words, the direction perpendicular to the lateral direction (arrow A direction) of the emission surface) in a plan view, and three points 800 mm above these points (point 1: 0°, point 3: 45°, point 5: 75°; all points 1600 mm high). The measurements were performed using a luminance meter "LS-150" manufactured by Konica Minolta. The luminance measured at each measurement point is shown in Table 1. [Table 1]

[0015] Next, as shown in Figures 3(a) and (b), the polarized blind film 20 was arranged so that the distance from the center C of the emission surface of the surface light source device 10 in the direction of point 2 was 600 mm and the main surface was vertical. The absorption axis direction of the polarizer contained in the polarized blind film 20 was parallel to the polarization direction of the linearly polarized light emitted from the surface light source device 10. With this configuration, the luminance of the surface light source device 10 through the polarized blind film 20 was measured at points 1 to 4. As the polarized blind film 20, a polarizing plate (manufactured by Nitto Denko Corporation, "TEG1465DUHC", single transmittance 43%, polarization degree 99.9%) including a polarizer and protective layers disposed on both sides of the polarizer was used.

[0016] 4, polarized blind film 20 was arranged so that the distance from center C of the exit surface of surface light source device 10 in the lateral direction of the exit surface was 600 mm, and so that the main surface was vertical. The absorption axis direction of the polarizer contained in polarized blind film 20 was parallel to the polarization direction of the linearly polarized light emitted from surface light source device 10. With this configuration, the luminance of surface light source device 10 via polarized blind film 20 was measured at points 3 to 6.

[0017] 5, polarized blind film 20 was positioned so that the distance from center C of the exit surface of surface light source device 10 in the direction of point 4 was 600 mm and so that the main surface was vertical. The absorption axis direction of the polarizer contained in polarized blind film 20 was parallel to the polarization direction of the linearly polarized light emitted from surface light source device 10. With this configuration, the luminance of surface light source device 10 via polarized blind film 20 was measured at points 1 to 6.

[0018] At each measurement point for each configuration, the ratio of luminance 2 measured through the polarized blind film to luminance 1 measured without the polarized blind film (luminance 2 / luminance 1 x 100) was calculated as the blind level (%). The smaller the blind level (%), the better the blinding. The blind levels and their converted values ​​into common logarithms (Log10) are shown in Table 2. [Table 2]

[0019] For 13 of the 14 pieces of measurement data shown in Table 2, the Log10 converted value of the blind level (%) was used as the objective variable, and the distance between the exit surface of the surface light source device and the polarized blind film, the angle between the vertical plane including the front direction of the exit surface and the vertical plane including the observation direction, and the height of the observation point were used as explanatory variables to allow AI to perform machine learning to create a prediction formula, and the predicted value under the measurement conditions of the remaining one piece of measurement data was compared with the actual measured value. By performing this operation for each of the 14 pieces of measurement data, the prediction formula was converged, and the following formula (1a) was obtained. Formula (1a): Y' = 2.46 x 10 -2 ×X1+5.74×10 -4 ×X2+1.06×10 -3 ×X3-1.89 (In the formula, Y' represents the predicted value (%) of the Log10 conversion value of the blind level, X1 represents the angle (°) between the vertical plane including the front direction of the emission surface of the surface light source device and the vertical plane including the observation direction, X2 represents the height (mm) of the observation point, and X3 represents the distance (mm) between the emission surface and the polarizing blind film.) In addition, using the data set shown in Table 2, a predictive model was constructed and variables were selected by Lasso regression using the Log10 converted value of the blind level (%) as the objective variable, the distance between the exit surface of the surface light source device and the polarized blind film, the angle between the vertical plane including the front direction of the exit surface and the vertical plane including the observation direction, and the height of the observation point as explanatory variables, and the logarithm was converted to an antilogarithm to obtain the above formula (1). As can be seen from formula (1), in the Lasso regression, the weight of the distance between the exit surface of the surface light source device and the polarized blind film was set to "0". In addition, by performing Log10 conversion on the blind level, data with reduced bias can be obtained, making it possible to appropriately construct a prediction equation.

[0020] FIG. 6(a) is a graph in which the horizontal axis represents the Log10 conversion value of the actual blind level listed in Table 2, and the vertical axis represents the predicted value of the Log10 conversion value of the blind level calculated based on formula (1a), and FIG. 6(b) is a graph in which the horizontal axis represents the Log10 conversion value of the actual blind level listed in Table 2, and the vertical axis represents the predicted value of the Log10 conversion value of the blind level calculated based on formula (1). In the graphs of FIG. 6(a) and (b), the accuracy (R2) of the prediction formula is 0.88 and 0.83, respectively, and it can be confirmed that the prediction accuracy is sufficiently high. From this, it can be seen that the Log10 conversion value of the predicted value of the blind level based on formula (1a) and formula (1) is appropriate.

[0021] According to the blind level estimation method of the embodiment of the present invention, the blind level can be estimated when a display is observed from an arbitrary observation point outside a partition to which a polarized blind film is applied by calculating a predicted value of the blind level based on the above formula (1). Also, a predetermined reference value is set for the blind level, and an observation point where the predicted value does not satisfy the reference value can be estimated as a blind-free point.

[0022] The blind level may correspond to the ratio of the luminance of a display observed inside a partition to which the polarized blind film is applied to the luminance observed outside. Thus, the lower the reference value is set, the higher the blindness can be ensured. The reference value of the blind level may be appropriately set depending on the use and size of the space, the required blind level, the type of display to be placed in the space, etc. The reference value may be, for example, 30% or less, and may be 20% or less, 10% or less, or 5% or less. In one embodiment, the reference value is set when the luminance of the display when displaying white measured at the observation point is, for example, 50 cd / m 2 Below, for example, 30 cd / m 2The display to be arranged may be a liquid crystal display or an organic electroluminescence display. The surface luminance of the display in the front direction when displaying white is generally 70 cd / m 2 ~160cd / m 2 It could be.

[0023] The size of the space to which the blind level estimation method according to the embodiment of the present invention is applied is not limited as long as the effect of the present invention can be obtained. The width of the space is preferably 3000 mm or less, and may be, for example, 500 mm to 2000 mm. The depth of the space is preferably 3000 mm or less, and may be, for example, 500 mm to 2000 mm. The height of the space is preferably 3000 mm or less, and may be, for example, 1500 mm to 2500 mm. The width of the space may be the length in a direction parallel to the lateral direction of the display placed in the space. The depth of the space may be the length in a direction perpendicular to the width of the space. In addition, the height at which the display is placed (the center height of the display) may be, for example, 700 mm to 1100 mm.

[0024] FIG. 7 shows the results of estimating the blind level and the blind cancellation location for a one-person work booth to which a polarized blind film is applied. In FIG. 7, the work booth 2 is a rectangular parallelepiped shape with a width of about 1050 mm, a depth of about 950 mm, and a height of about 2000 mm. A display 30 is attached to the wall in the width direction of the work booth 2 at a center height of 1000 mm, and a sofa 32 for the worker is placed on the opposite side. In addition, almost the entire surface of the walls on both sides of the worker is made of a transparent material, and the polarized blind film 20 is installed so that the absorption axis direction of the polarizer is parallel to the polarization direction of the linearly polarized light emitted from the display 30. FIG. 7(a) and (b) show the estimation results when the work booth 2 is viewed from above and from the right side of the worker, respectively. As shown in these figures, the predicted blind level is over 20% in all areas where the angle between the viewing direction and the front direction of the display is over 70° and 90° or less, and the predicted blind level is over 20% in the areas where the angle is over 65° and 70° or less in height of 1400mm or more. Therefore, if the standard value of the blind level is set to 20% or less, these areas are estimated to be blind-free areas.

[0025] FIG. 8 shows the results of estimating the blind level and estimating the blind-free location for a two-person work booth to which a polarized blind film is applied. In FIG. 8, the work booth 4 is a rectangular parallelepiped shape with a width of 2200 mm, a depth of 1030 mm, and a height of about 2100 mm. A display 30 is attached to the wall in the width direction of the work booth 4 at a center height of 1000 mm, and almost the entire surface of the wall opposite the display is made of a transparent material, and the polarized blind film 20 is installed so that the absorption axis direction of the polarizer is parallel to the polarization direction of the linearly polarized light emitted from the display 30. FIG. 8(a) and (b) show the estimation results when the work booth 4 is viewed from above and from the opposite side of the display, respectively. As shown in these figures, the predicted value of the blind level is more than 3% in all areas where the angle between the observation direction and the front direction of the display exceeds 40°, and in areas where the angle is more than 30° and is equal to or less than 40°, there are parts where the predicted value of the blind level is more than 3% in parts with a height of 1000 mm or more. Therefore, when the reference value of the blind level is set to 3% or less, these regions are estimated as unblinded regions.

[0026] The partitions that separate the space may be fixed (e.g., walls) or movable (e.g., doors, movable partitions). In one embodiment, the space is a room that is rectangular in plan view, and is divided by two pairs of parallel partitions (e.g., walls) that are arranged perpendicular to each other. At least one of the partitions that separate the space is partially or entirely made transparent (in other words, the inside of the space can be viewed) using a transparent member, and the polarized blind film is attached to the transparent member. The polarized blind film can be attached to the partition by, for example, an adhesive layer (adhesive layer, pressure-sensitive adhesive layer, etc.).

[0027] Fig. 9 is a schematic cross-sectional view illustrating the configuration of one example of a polarizing blind film. The polarizing blind film 20 includes a polarizer 22, a first protective layer 24a disposed on one side thereof, and a second protective layer 24b disposed on the other side thereof. The first protective layer and the second protective layer are attached to the polarizer via, for example, an adhesive layer (e.g., a bonding agent layer). Depending on the purpose, either the first protective layer or the second protective layer may be omitted.

[0028] The polarized blind film 20 may further include an adhesive layer 26. When the polarized blind film includes an adhesive layer, the adhesive layer allows the polarized blind film to be attached to a partition, facilitating installation. A release liner may be temporarily attached to the surface of the adhesive layer until the polarized blind film is used.

[0029] Although not shown, the polarizing blind film may further include any suitable functional layer, such as a hard coat layer, an anti-fouling layer, an anti-reflection layer, and the like.

[0030] The thickness of the polarizing blind film excluding the pressure-sensitive adhesive layer can be, for example, 25 μm to 200 μm, and preferably 50 μm to 120 μm.

[0031] Any suitable polarizer may be used as the polarizer. The polarizer is typically made of a polyvinyl alcohol (PVA)-based resin film containing a dichroic material (e.g., iodine). Examples of PVA-based resins include polyvinyl alcohol, partially formalized polyvinyl alcohol, ethylene-vinyl alcohol copolymer, and partially saponified ethylene-vinyl acetate copolymer.

[0032] The polarizer preferably exhibits absorption dichroism at any wavelength of 380 nm to 780 nm. The single transmittance of the polarizer is preferably 41.0% to 46.0%, more preferably 42.0% to 45.0%. The degree of polarization of the polarizer is preferably 97.0% or more, more preferably 99.0% or more, and even more preferably 99.9% or more.

[0033] The single transmittance and the degree of polarization can be measured, for example, using an ultraviolet-visible spectrophotometer. The degree of polarization P can be calculated by measuring the single transmittance Ts, parallel transmittance Tp, and crossed transmittance Tc using an ultraviolet-visible spectrophotometer, and using the obtained Tp and Tc, using the following formula. Note that Ts, Tp, and Tc are Y values ​​measured using a 2-degree visual field (C light source) according to JIS Z8701 and corrected for visibility. Polarization degree P(%)={(Tp-Tc) / (Tp+Tc)} 1 / 2 ×100

[0034] The thickness of the polarizer is typically 20 μm or less, for example, 12 μm or less, preferably 10 μm or less, more preferably 1 μm to 8 μm, and further preferably 3 μm to 7 μm.

[0035] The protective layer is composed of any suitable resin film. Representative materials for the resin film include cellulose resins such as triacetyl cellulose (TAC), cycloolefin resins such as polynorbornene, (meth)acrylic resins, polyester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polyolefin resins such as polyethylene, and polycarbonate resins. Representative examples of (meth)acrylic resins include (meth)acrylic resins having a lactone ring structure. (Meth)acrylic resins having a lactone ring structure are described in, for example, JP-A-2000-230016, JP-A-2001-151814, JP-A-2002-120326, JP-A-2002-254544, and JP-A-2005-146084. These publications are incorporated herein by reference.

[0036] The thickness of the protective layer is preferably from 10 μm to 80 μm, more preferably from 12 μm to 40 μm, and further preferably from 15 μm to 35 μm.

[0037] B. Method of manufacturing blind spaces A method for manufacturing a blind space according to an embodiment of the present invention includes estimating, by the blind level estimation method, a blind elimination point in a space partitioned using a partition to which a polarized blind film including a polarizer is attached, and in which a display placed inside is blinded by being viewed through the polarized blind film, and compensating for the blind function of the blind elimination point. Here, "compensating for the blind function of the blind elimination portion" means making the blind level of the blind elimination portion satisfy a reference value. Compensation for the blind function of the blind elimination portion can be performed, for example, by covering the blind elimination portion with a non-transparent member (e.g., a member having a total light transmittance of 10% or less) or a semi-transparent member (e.g., a member having a total light transmittance of 20% to 50%), by placing a non-transparent or semi-transparent partition between the display and the blind elimination portion, by mosaic-toning (blurring) the blind elimination portion using a retardation film or the like, and the like. The blind elimination portion may be covered entirely, or may be covered partially to the extent that the display content of the display becomes difficult to view.

[0038] For example, with respect to the work booth 2 shown in Figure 7, by attaching a shading film to areas where the predicted blind level exceeds 20%, a blind space can be created with a blind level of 20% or less.

[0039] C. Luminance prediction method A method for predicting luminance information according to an embodiment of the present invention includes: (i) measuring the luminance of a display placed inside a space partitioned using a partition (polarizing partition) to which a polarizing blind film containing a polarizer is attached, from a plurality of measurement points outside the partition; (ii) obtaining a prediction formula for predicting the luminance information at an arbitrary point outside the partition by applying machine learning to luminance information based on the luminance of the display measured at the plurality of measurement points as a response variable and an angle between a vertical plane including a front direction of the display and a vertical plane including a measurement direction and a height of the measurement points as explanatory variables; and (iii) predicting the luminance information at the prediction target location by substituting the explanatory variables at the prediction target location into the prediction formula; Includes. According to the above prediction method, it is possible to predict luminance information of a display placed in a space at any point outside the space partitioned by a polarizing partition. Here, the "luminance information based on the luminance of the display measured at a plurality of measurement points" in step (ii) may be the measured luminance itself, or may be a ratio of the measured luminance to the luminance of a display measured in the same positional relationship except that it is not through a polarizing partition (for example, the blind level described in section A), or a value obtained by logarithmically converting these values, etc.

[0040] The machine learning in step (ii) can be typically performed using a regression method. The regression method is not particularly limited, and examples thereof include linear regression, lasso regression, linear ridge regression, kernel ridge regression, Gaussian process regression, support vector regression, and neural network regression. In addition, the explanatory variables may include the distance between the output surface of the display and the polarizing blind film, the arrangement angle, and the polarization degree of the polarizing blind film (polarizer). [Industrial Applicability]

[0041] The blind level estimation method and blind space manufacturing method according to the embodiment of the present invention can be suitably used in the manufacture of workspaces that require information management. [Explanation of symbols]

[0042] 10 surface light source device 20 Polarized Blind Film 30 Display

Claims

1. A method for estimating a blind level of a space partitioned by a partition to which a polarizing blind film including a polarizer is attached, the method comprising the steps of: calculating a predicted value of a blind level when the display is observed from outside the partition based on the following formula (1): Formula (1): Y=10^ (2.27×10 －２ ×X1+2.41×10 －４ ×X2-6.19×10 －１ ) (In the formula, Y represents the predicted value (%) of the blind level, X1 represents the angle (°) between a vertical plane including the front direction of the display and a vertical plane including the observation direction, and X2 represents the height (mm) of the observation point).

2. The method of claim 1 , further comprising: estimating, as an unblinded observation location, an observation location where the predicted value of the blind level does not meet a predetermined criterion value.

3. 2. The method of claim 1, wherein the space has a width of 3000 mm or less, a depth of 3000 mm or less, and a height of 3000 mm or less.

4. A method according to claim 2, comprising the steps of: estimating an unblinding point in a space partitioned by a partition to which a polarizing blind film including a polarizer is attached, the space being blinded by a display placed therein being viewed through the polarizing blind film; and Compensating for the blind function of the blind cancellation portion; A method for manufacturing a blind space, comprising:

5. The manufacturing method according to claim 4, wherein the compensation of the blind function is performed by covering the blind-eliminating portion with a non-transparent or semi-transparent member, by placing a non-transparent or semi-transparent partition between the display and the blind-eliminating portion, or by mosaic-toning the blind-eliminating portion.

6. (i) measuring the luminance of a display placed inside a space partitioned by a partition to which a polarizing blind film containing a polarizer is attached, from a plurality of measurement points outside the partition; (ii) obtaining a prediction formula for predicting the luminance information at an arbitrary point outside the partition by applying machine learning to a target variable based on the luminance of the display measured at the plurality of measurement points, and to an explanatory variable including an angle between a vertical plane including a front direction of the display and a vertical plane including a measurement direction and a height of the measurement points; and (iii) predicting the luminance information at the prediction target location by substituting the explanatory variables at the prediction target location into the prediction formula; A method for predicting luminance information, comprising:

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