JP2010261847A - System for evaluating electronic display medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system for evaluating electronic display medium which enables objective evaluation of visibility in a wide-ranging illumination environment, as to the visibility of an image displayed on an electronic display medium of a reflection type. <P>SOLUTION: The system for evaluating the electronic display medium performs colorimetry of a spectral distribution by a means for spectral colorimetry while being illuminated by an illuminating means, as to the image displayed on the electronic display medium of the reflection type, computes the reflectance and/or the density of the image, based on the colorimetry, and evaluates the visibility of the image displayed on the electronic display medium, based on a computed value. In the means for the spectral colorimetry, an angle &theta;1 formed by the reflected light from the electronic display medium for performing the colorimetry of the spectral distribution and by the electronic display medium can be set and also the illuminance in the image on the electronic display medium can be adjusted. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an electronic display medium evaluation system that evaluates the visibility of an image displayed on a reflective electronic display medium.

  In recent years, with the global warming, a display device with low power consumption is required. Among them, electronic paper, which is a reflective electronic display medium having a memory property that does not use a light emitting member, has begun to be used in various places such as an electronic book terminal, a display panel of a mobile phone, and an electronic shelf label.

Such a reflection-type electronic display medium is easy to carry and has the features of hard copy, such as good storability, but can be rewritten repeatedly on the same display screen. It is also an ideal medium because of its integration with digital information and energy saving because it does not require power for image retention.
In addition, such a reflection type electronic display medium can be viewed in a free posture at a place preferred by the user, like a hard copy printed on paper or the like. It is a display medium that is less mentally fatigued even if it is viewed for a long time, and is mentally and physically friendly to the user.

On the other hand, at homes and offices, the opportunity to view electronic display media has increased greatly, and a liquid crystal display (LCD) that can be displayed therein is often used as a visual interface for VDT (Visual Display Terminal) work. As a result, ergonomic evaluation of LCDs is underway.
For example, for reflective LCDs, the subjective tolerance limits for character visibility and text readability on reflective LCDs under lighting conditions that assume the actual office environment, reflectivity, brightness index, and contrast. The research which makes clear from the relationship is made (for example, refer nonpatent literature 1 and 2).

  However, the evaluation by such research is made by limiting the use environment of the reflective LCD having no memory property to the office environment, and it cannot be said that the reflective LCD is practically applicable. .

In addition, spectrocolorimeters and reflectance measurement systems with variable measurement angles have been proposed to objectively evaluate how they look from various angles, such as cosmetics applied to human skin and car exteriors. (For example, refer to Patent Documents 1 and 2.)
Further, with respect to a reflection type electronic display medium, a difference in appearance due to a change in observation angle has been studied, and a preferable value for the contrast expressed by reflectance has been proposed (for example, Patent Document 3). reference.).

In any of the above proposals, only the evaluation in the case where the reflective electronic display medium is used in a limited specific environment can be obtained.
However, the reflective electronic display medium reads information by visually recognizing changes in the reflectance of light from the surrounding ambient light, and further, as described above, can be freely positioned in a place preferred by the user. Therefore, the evaluation when used in a limited lighting environment cannot be said to be a sufficient evaluation for the reflective electronic display medium.
In addition, it cannot be said that a reflection-type electronic display medium (electronic paper) capable of white display, which has recently begun to be used in electronic book terminals and office viewers, has been evaluated assuming a use environment.

Japanese Patent No. 3095525 JP 2007-291066 A JP-A-2005-114721

The Journal of the Institute of Television Engineers of Japan, 50 (8) 1091-1095 (1996) The Journal of the Institute of Television Engineers of Japan, 50 (8) 1172-1176 (1996)

  The present invention has been made based on the circumstances as described above, and an object of the present invention is to objectively improve the visibility of an image displayed on a reflective electronic display medium in a wide range of illumination environments. It is an object of the present invention to provide an electronic display medium evaluation system capable of evaluating the above.

The electronic display medium evaluation system of the present invention measures the spectral distribution of the image displayed on the reflective electronic display medium by the spectral colorimetric means in a state illuminated by the illumination means, and based on the obtained spectral distribution. An electronic display medium evaluation system that calculates the reflectance and / or density of the image by the data conversion means and evaluates the visibility of the image displayed on the electronic display medium based on the reflectance and / or density obtained by the calculation Because
The angle θ1 formed between the reflected light from the electronic display medium for measuring the spectral distribution in the spectral colorimetric means and the electronic display medium can be set by a reflection angle variable mechanism,
The illumination unit is provided with an illuminance adjustment mechanism, and can adjust the illuminance in an image on the electronic display medium.

  In the electronic display medium evaluation system of the present invention, the angle θ1 that can be set by the reflection angle varying mechanism is preferably in the range of 15 degrees to 90 degrees.

Moreover, in the electronic display medium evaluation system of the present invention, the illumination means includes at least three kinds of light sources having different color temperatures,
A light source selection mechanism for selecting one of these three or more light sources is provided.
The light source provided in the illumination means preferably has a color temperature in the range of 1900K to 8000K.

  Moreover, in the electronic display medium evaluation system of this invention, it can be set as the structure which can set the distance d from the said electronic display medium of the said spectral colorimetry means with a colorimetric distance setting mechanism.

  In the electronic display medium evaluation system of the present invention, the distance d that can be set by the colorimetric distance setting mechanism is preferably in the range of 30 mm to 500 mm.

  In the electronic display medium evaluation system of the present invention, an angle θ2 formed between the emitted light from the illumination unit and the electronic display medium can be set by an incident angle variable mechanism.

  Moreover, in the electronic display medium evaluation system of this invention, it is preferable that angle (theta) 2 which can be set by the said incident angle variable mechanism is the range of 15 degree | times-90 degree | times.

  Moreover, in the electronic display medium evaluation system of this invention, it is preferable that the illumination intensity in the image on the said electronic display medium which can be adjusted with the said illumination intensity adjustment mechanism is the range of 10 lux-2000 lux.

  In the electronic display medium evaluation system according to the present invention, the illuminance adjustment mechanism includes an ND filter capable of adjusting the illuminance in the entire wavelength range of the spectral distribution to be measured by the spectral colorimetric means. Is preferred.

  Moreover, in the electronic display medium evaluation system of this invention, it can be set as the structure by which the emitted light from an illumination means is scattered by the light-scattering mechanism, and is irradiated in the state made into the scattered light to the said electronic display medium.

  Furthermore, in the electronic display medium evaluation system of the present invention, the electronic display medium can be an electronic paper capable of performing white display.

  According to the electronic display medium evaluation system of the present invention, since the illuminance in the image on the electronic display medium can be adjusted by the illuminance adjustment mechanism, the visibility of the electronic display medium can be evaluated in a wide range of illumination environment. Therefore, visibility suitable for practical use can be objectively evaluated.

It is a schematic diagram which shows the structural example of the spectrocolorimeter used for the electronic display medium evaluation system of this invention. It is a schematic diagram which shows the colorimetry area | region in a reflection type electronic display medium. (A) is a schematic diagram which shows the structural example in which the illumination intensity adjustment mechanism of the spectrocolorimeter used for the electronic display medium evaluation system of this invention consists of a light transmittance change filter group, (b) is a light transmittance change filter group. FIG. It is a schematic diagram which shows the structural example in which the spectrocolorimeter is provided with two or more spectrocolorimeters about the spectrocolorimeter used for the electronic display medium evaluation system of this invention. It is a flowchart of evaluation of visibility in an example of an electronic display medium evaluation system of the present invention. It is a schematic diagram which shows the structural example by which the light source selection mechanism was provided in the spectrocolorimeter used for the electronic display medium evaluation system of this invention. It is a flowchart of the evaluation of the visibility which concerns on the example which uses the light source selection mechanism of the electronic display medium evaluation system of this invention. It is a schematic diagram which shows the structural example by which the colorimetric distance setting mechanism was provided in the spectrocolorimeter used for the electronic display medium evaluation system of this invention. It is a schematic diagram which shows the structural example by which the shutter was provided in the spectral colorimetry means of the spectral colorimeter used for the electronic display medium evaluation system of this invention. It is a flowchart of evaluation of the visibility which concerns on the example which uses the colorimetric distance setting mechanism of the electronic display medium evaluation system of this invention. It is a schematic diagram which shows the structural example in which the illumination means is provided with two or more illuminators about the spectrocolorimeter used for the electronic display medium evaluation system of this invention. It is a flowchart of evaluation of the visibility which concerns on the example which uses the incident angle variable mechanism of the electronic display medium evaluation system of this invention. It is a schematic diagram which shows the structural example by which the diffuser plate was provided in the spectrocolorimeter used for the electronic display medium evaluation system of this invention. It is a flowchart of evaluation of the visibility in the example which concerns on the light-scattering mechanism of the electronic display medium evaluation system of this invention. It is a schematic diagram which shows another structural example of the spectrocolorimeter used for the electronic display medium evaluation system of this invention.

  Hereinafter, the present invention will be described in detail.

The electronic display medium evaluation system of the present invention evaluates the visibility of an image displayed on a reflective electronic display medium (hereinafter also referred to as “reflective electronic display medium”). For example, an image (not shown) displayed on the reflective electronic display medium 10 using a spectrocolorimeter as shown in FIG. The spectral distribution is measured, the reflectance and / or density of the image is calculated by the data conversion means 20 (see FIG. 5) based on the obtained spectral distribution, and the reflectance and / or density obtained by the calculation is calculated. The visibility of the image displayed on the reflective electronic display medium 10 is evaluated.
In the spectrocolorimeter used in this electronic display medium evaluation system, the reflected light 31 from the reflective electronic display medium 10 for measuring the spectral distribution in the spectral colorimetric means 13, and the reflective electronic display medium. 10 (hereinafter also referred to as “reflection angle”) θ1 can be set by the reflection angle variable mechanism 15 (see FIG. 5), and the illumination means 12 is provided with an illuminance adjustment mechanism 19. Thus, the illuminance of the image on the reflective electronic display medium 10 can be adjusted.
In addition, the image here includes characters such as letters and graphic symbols in addition to images such as illustrations and photographs.

The image whose spectral distribution is measured by the spectral colorimetric means 13 may be the entire area of the image displayed on the reflective electronic display medium 10 or may be displayed on the reflective electronic display medium 10. It may be a partial area of the image.
Specifically, as shown in FIG. 2, the colorimetry corresponding to the range in which the reflected light is received by the photodetection sensor 23 provided in the spectral colorimetric means 13 in the region on the reflective electronic display medium 10. Since the image displayed in the area 30 is colorimetrically measured, the entire area of the image displayed on the reflective electronic display medium 10 is displayed by displaying an image having the same shape as the colorimetric area 30 and measuring the color. On the other hand, a part of the image displayed on the reflective electronic display medium 10 is measured by displaying an image larger than the color measurement region 30 and measuring a part of the image. .

  The image displayed on the reflective electronic display medium 10 varies depending on the resolution of the drive element for driving the reflective electronic display medium 10, but is preferably evaluated if the resolution is in the range of 72 to 500 dpi. be able to.

The specific configuration of the spectrocolorimeter will be described below.
This spectrocolorimeter has an integrating sphere 11 in which an opening 11A for contacting a reflection type electronic display medium 10 whose spectral distribution is to be measured is formed, and a hole is formed on the spherical surface of the integrating sphere 11. The illumination means 12 is provided in the hole, and a hole is provided at a position other than the regular reflection position on the spherical surface of the integrating sphere 11 and the reflective electronic display medium 10. A spectral colorimetric means 13 is provided, and a data conversion means 20 is connected to the spectral colorimetric means 13.

The integrating sphere 11 integrates spatially by repeatedly diffusing and reflecting the light emitted from the illumination means 12 on its inner wall, thereby generating scattered light.
The size of the integrating sphere 11 is not particularly limited, but may be sufficiently large with respect to the size of the opening 11A such that light incident on the opening 11A of the integrating sphere 11 becomes scattered light. preferable.

  The integrating sphere 11 can be made of a material having extremely high reflectance, and the inner wall of the shape formed of an appropriate material is coated with a coating material having high reflectance. You can also.

In the electronic display medium evaluation system of the present invention, the illumination means 12 includes an appropriate light source and an illuminance adjustment mechanism 19.
As the light source, for example, various conventionally known light sources such as a candle, an incandescent lamp (tungsten lamp), a halogen lamp, a metal halide lamp, a fluorescent lamp, a sodium lamp, a xenon lamp, a fluorescent lamp, and an LED can be used.
Furthermore, a wavelength cut filter may be used in combination to adjust the color temperature of the light source as necessary.
The illuminance adjustment mechanism 19 adjusts the illuminance of the light from the light source so that the light applied to the image on the reflective electronic display medium 10 becomes light of a predetermined illuminance. The color means 13 may comprise an ND (Neutral Density) filter capable of adjusting the illuminance over the entire wavelength range of the spectral distribution to be measured.
Specifically, the illuminance adjustment is performed in a timely manner by an illuminance measuring device (not shown) provided opposite to the colorimetric region 30 by providing a plurality of ND filters with different degrees of dimming. This can be done by measuring the illuminance and replacing the ND filter by the illuminance adjustment mechanism 19 until the measured illuminance reaches the desired illuminance.

Further, as shown in FIG. 3, the illuminance adjusting mechanism 19 may be composed of a light transmittance changing filter group 22 capable of changing the light transmittance.
As shown in FIG. 3B, the light transmittance changing filter group 22 includes a plurality of optical filters 22A to 22E concentrically centered on an axis 22α, and these optical filters 22A. It is installed so that it can rotate around the axis 22α so that one of ˜22E is selected and light from the light source is transmitted.
Further, an electromagnetic filter capable of electrically controlling the light transmittance may be used instead of the light transmittance changing filter group 22.
In FIG. 3, reference numeral 40 denotes an inclined plate. The inclined plate 40 is for preventing the direct light from the light source and / or the reflected light from the direct light from the light source via the reflective electronic display medium 10 from entering the light detection sensor 23.

The illuminance in the image on the reflective electronic display medium 10 that can be adjusted by the illuminance adjusting mechanism 19 is preferably in the range of 10 lux to 2000 lux in consideration of the environment seen by a person.
When the illuminance in the image on the reflective electronic display medium 10 is in the above range, the visibility of the reflective electronic display medium 10 can be evaluated in a wide range of illumination environments.

  The spectrocolorimetric means 13 has a light detection sensor 23 in a state of facing the reflective electronic display medium 10, and examples of such a light detection sensor 23 include various known ones such as a photodiode, a CCD, and a CMOS. Multi-cell detectors can be used.

The angle reflection angle θ1 formed by the reflected light 31 from the reflective electronic display medium 10 for measuring the spectral distribution in the light detection sensor 23 of the spectral colorimetric means 13 and the surface of the reflective electronic display medium 10 is: It can be set by the reflection angle variable mechanism 15.
Specifically, as shown in FIG. 4, the spectrocolorimeter is not a regular reflection position with respect to the illumination unit 12 on the spherical surface of the integrating sphere 11 and the reflective electronic display medium 10, and the reflection angle θ <b> 1 with each other. Are provided with spectral colorimeters 13A to 13E at different positions, respectively, and the spectral colorimetric means 13 is formed by these spectral colorimeters 13A to 13E. The reflection angle θ1 can be set by selecting the spectrocolorimeters 13A to 13E. The plurality of spectral colorimeters 13 </ b> A to 13 </ b> E are all provided with a light detection sensor 23 in a state of facing the reflective electronic display medium 10 and connected to the data conversion means 20.
Further, unlike the embodiment of FIG. 4, the spectrocolorimeter is different from the one of the spectrocolorimeter in that the reflection angle θ1 has a plurality of specific values (for example, each of the spectrocolorimeters 13A to 13E in FIG. 4). The reflection angle variable mechanism 15 may be constituted by this movable spectrocolorimeter, which is movably provided at a position where the reflection angle θ1) or an arbitrary value is obtained. In the colorimeter, it is not necessary to provide a plurality of light detection sensors 23, and a single light detection sensor 23 can cope with it.

  The reflection angle θ1 that can be set by the reflection angle varying mechanism 15 is preferably in the range of 15 degrees to 90 degrees.

Using such a spectrocolorimeter, the visibility of the image on the reflective electronic display medium 10 is converted into a numerical value as follows.
That is, as shown in the flowchart of FIG. 5, first, light is emitted from the illumination unit 12 in a state where the illuminance adjustment mechanism 19 adjusts the illuminance on the image on the reflective electronic display medium 10. This light is incident on the colorimetric region 30 of the reflective electronic display medium 10 as direct light and / or as scattered light by being diffused and reflected by the inner wall of the integrating sphere 11. The light incident on the colorimetric region 30 of the reflective electronic display medium 10 is reflected by the reflective electronic display medium 10 and is selected from the spectrocolorimeters 13A to 13E by the reflection angle variable mechanism 15 or corresponds to these. The spectral distribution of the light incident on the light detection sensor 23 in the spectral colorimetric means 13 moved to the position to be measured is colorimetrically measured, and the data of the colorimetric spectral distribution is transmitted to the data converting means 20 and the data The conversion means 20 calculates the reflectance and / or density.

A specific method for evaluating the visibility of the reflective electronic display medium 10 using the obtained reflectance and / or concentration is not particularly limited, and the usage of the reflective electronic display medium 10 to be evaluated can be used. The method can be considered.
For example, when the reflective electronic display medium 10 is carried and used both at home and in the office, reflectances and / or concentrations relating to a plurality of types of illuminance environments corresponding to the home and office are obtained, and from these correlations The method of evaluating can be mentioned.

  In the electronic display medium evaluation system as described above, examples of the reflective electronic display medium 10 to be evaluated include electronic paper that can perform white display.

  According to the above electronic display medium evaluation system, since the illuminance in the image on the reflective electronic display medium 10 can be adjusted by the illuminance adjustment mechanism 19, the reflective electronic display medium 10 can be used in a wide range of illumination environments. Visibility can be evaluated, and therefore visibility suitable for practical use can be objectively evaluated.

  Although the present invention has been specifically described above, the present embodiment is not limited to the above example, and various modifications can be made.

<Modification 1>
For example, in the spectrocolorimeter used in the electronic display medium evaluation system of the present invention, the illumination means 12 includes at least three types of light sources having different color temperatures, and one of the three or more types of light sources is selected by the light source selection mechanism 18. It may have a configuration to be selected.
All of the light sources provided in the illumination unit 12 have a color temperature in the range of 1900K to 8000K. The light source having a color temperature of 1900K is specifically a candle, a light bulb, or an incandescent lamp, and provides a lighting environment in which a person can be mentally relaxed from yellow to orange in a normal lighting environment. Can do.

  When the light source selection mechanism 18 includes, for example, three types of light sources, specifically, as shown in FIG. 6, the light source selection mechanism 18D is configured to switch the light sources 18A to 18C to each other by an optical switching unit 18D incorporating an optical mirror. It can have.

  As a combination of light sources, for example, when three types of light sources are provided, specifically, the first light source has a color temperature in the range of 1900K to 4000K assuming a light source such as a candle or a tungsten lamp. The second light source has a color temperature in the range of 4000K to 5500K assuming a daylight fluorescent lamp used in homes and offices, and the third light source is used in a meeting room such as an office. It is preferable to have a color temperature in the range of 5500K to 8000K assuming a daylight color or a fluorescent lamp for a signboard.

In such a spectrocolorimeter, the visibility of the image on the reflective electronic display medium 10 is converted into a numerical value as follows.
That is, as shown in the flowchart of FIG. 7, first, in the illumination unit 12, a light source is selected by the light source selection mechanism 18, and the illuminance on the image on the reflective electronic display medium 10 from this light source is selected by the illuminance adjustment mechanism 19. The light is emitted in a state where is adjusted. This light is incident on the colorimetric region 30 of the reflective electronic display medium 10 as direct light and / or as scattered light by being reflected and diffused on the inner wall of the integrating sphere 11. Light incident on the colorimetric region 30 of the reflective electronic display medium 10 is reflected by the reflective electronic display medium 10 and is selected from the spectrocolorimeters 13A to 13E by the reflection angle variable mechanism 15 or corresponds to these. The spectral distribution of the light incident on the light detection sensor 23 in the spectral colorimetric means 13 moved to the position to be measured is colorimetrically measured, and the data of the colorimetric spectral distribution is transmitted to the data converting means 20 and the data The conversion means 20 calculates the reflectance and / or density.

<Modification 2>
Further, for example, the spectrocolorimeter used in the electronic display medium evaluation system of the present invention, as shown in FIG. 8, takes into account the illumination environment in which the reflective electronic display medium is actually used, and the spectrocolorimeter means 13. The distance d from the reflective electronic display medium 10 may be configured to be set by the colorimetric distance setting mechanism 17.
Specifically, the position of the light detection sensor 23 in the spectrocolor measurement unit 13 can be configured to be moved along the traveling direction of the reflected light 31 from the reflective electronic display medium 10.
For example, as shown in FIG. 9, the colorimetric distance setting mechanism 17 has an integrating sphere 11 in which the spectral colorimetric means 13 is installed from the circumferential portion at the lower end when the light detection sensor 23 has a disk shape. A truncated cone body 23A having a bellows structure that can be expanded and contracted is provided so as to extend around a hole on the spherical surface.

  The distance d that can be set by the colorimetric distance setting mechanism 17 can be set in the range of 30 mm to 500 mm, for example.

The spectral colorimetric means 13 of this example may be provided with a shutter mechanism for avoiding light sneaking around the light detection sensor 23.
The shutter mechanism can be constituted by a truncated cone 23A of the colorimetric distance setting mechanism 17, for example.

In such a spectrocolorimeter, the visibility of the image on the reflective electronic display medium 10 is converted into a numerical value as follows.
That is, as shown in the flowchart of FIG. 10, first, light is emitted from the illumination unit 12 in a state where the illuminance adjustment mechanism 19 adjusts the illuminance on the image on the reflective electronic display medium 10. This light is incident on the colorimetric region 30 of the reflective electronic display medium 10 as direct light and / or as scattered light by being reflected and diffused on the inner wall of the integrating sphere 11. Light incident on the colorimetric region 30 of the reflective electronic display medium 10 is reflected by the reflective electronic display medium 10 and is selected from the spectrocolorimeters 13A to 13E by the reflection angle variable mechanism 15 or corresponds to these. The spectral distribution of the light incident on the photodetection sensor 23 of the spectrocolorimetric means 13 in which the distance d of the photodetection sensor 23 is set by the colorimetric distance setting mechanism 17 is measured. The colorimetric spectral distribution data is transmitted to the data conversion unit 20, and the data conversion unit 20 calculates the reflectance and / or density.

<Modification 3>
Further, for example, the spectrocolorimeter used in the electronic display medium evaluation system of the present invention has an angle formed between the incident light 32 emitted from the illumination means 12 and incident on the reflective electronic display medium 10 and the reflective electronic display medium 10. (Hereinafter also referred to as “incident angle.”) Θ2 (see FIG. 1) may be configured to be set by the incident angle variable mechanism 16.
Specifically, as shown in FIG. 11, the illumination unit 12 is not in the position of regular reflection with respect to the spectral colorimetry unit 13 and the reflective electronic display medium 10 on the spherical surface of the integrating sphere 11, and is incident on each other. A plurality of illuminators 12A to 12C are provided at a plurality of positions where θ2 is different, and the incident angle θ2 is set by selecting any of the illuminators 12A to 12C by the incident angle variable mechanism 16. be able to. The plurality of illuminators 12A to 12C all have the same performance.
Further, unlike the embodiment of FIG. 11, the spectrocolorimeter is different from the embodiment of FIG. 11 in that one illuminator has a plurality of specific incident angles [theta] 2 (for example, each incident angle [theta] 2 corresponding to each illuminator 12A-12C in FIG. 11). Value), or the movable illuminator, the incident angle variable mechanism 16 may be configured so as to be movably provided at a position having an arbitrary value. In a spectrocolorimeter having such a configuration, illumination There is no need to provide a plurality of fixtures, and a single illuminator can be used.

  The incident angle θ2 that can be set by the incident angle variable mechanism 16 is preferably in the range of 15 degrees to 90 degrees.

In such a spectrocolorimeter, the visibility of the image on the reflective electronic display medium 10 is converted into a numerical value as follows.
That is, as shown in the flowchart of FIG. 12, first, the illumination means 12 is selected from the illuminators 12 </ b> A to 12 </ b> C by the incident angle variable mechanism 16, or the illuminator is moved to a position corresponding to these, and the illuminance adjustment mechanism 19 In the state where the illuminance on the image on the reflective electronic display medium 10 is adjusted, light is emitted from the illumination means 12. This light is incident on the colorimetric region 30 of the reflective electronic display medium 10 as direct light and / or as scattered light by being reflected and diffused on the inner wall of the integrating sphere 11. Light incident on the colorimetric region 30 of the reflective electronic display medium 10 is reflected by the reflective electronic display medium 10 and is selected from the spectrocolorimeters 13A to 13E by the reflection angle variable mechanism 15 or corresponds to these. The spectral distribution of the light incident on the light detection sensor 23 in the spectral colorimetric means 13 moved to the position to be measured is colorimetrically measured, and the data of the colorimetric spectral distribution is transmitted to the data converting means 20 and the data The conversion means 20 calculates the reflectance and / or density.

<Modification 4>
Further, for example, in the spectrocolorimeter used in the electronic display medium evaluation system of the present invention, as shown in FIG. 13, the radiated light from the illumination means 12 is scattered by the light scattering mechanism 14 and the reflection type electronic display medium 10. It may have a configuration of being irradiated.
Specifically, the light scattering mechanism 14 is provided between the illumination unit 12 and the reflective electronic display medium 10 inside the integrating sphere 11 and is to be incident on the spectral colorimetric unit 13. It can consist of a diffuser plate provided in a state where it is fixed to the inner wall at a position where the optical path of the reflected light 31 from 10 is not blocked.

In such a spectrocolorimeter, the visibility of the image on the reflective electronic display medium 10 is converted into a numerical value as follows.
That is, as shown in the flowchart of FIG. 14, first, light is emitted from the illumination unit 12 in a state where the illuminance adjustment mechanism 19 adjusts the illuminance on the image on the reflective electronic display medium 10. This light is converted into scattered light by passing through the diffusion plate constituting the light scattering mechanism 14, and is incident on the colorimetric region 30 of the reflective electronic display medium 10 in this state. Light incident on the colorimetric region 30 of the reflective electronic display medium 10 is reflected by the reflective electronic display medium 10 and is selected from the spectrocolorimeters 13A to 13E by the reflection angle variable mechanism 15 or corresponds to these. The spectral distribution of the light incident on the light detection sensor 23 in the spectral colorimetric means 13 moved to the position to be measured is colorimetrically measured, and the data of the colorimetric spectral distribution is transmitted to the data converting means 20 and the data The conversion means 20 calculates the reflectance and / or density.

<Modification 5>
Further, for example, the spectrocolorimeter used in the electronic display medium evaluation system of the present invention is not limited to the one using an integrating sphere, and the following spectrocolorimeter can also be used.
That is, as shown in FIG. 15, an illuminating means 52 having a light source 58A, an illuminance adjusting mechanism 59 for adjusting the illuminance through the light from the light source 58A, and one or more reflecting mirrors 52a and 52b as necessary. A diffusing plate 60 for diffusing light from the light source 58; a spectrocolorimetric means 53 having a light detection sensor (not shown) at a position that is not a regular reflection position for the illumination means 52 and the reflective electronic display medium 10; And a reflection angle variable mechanism 55 for setting the reflection angle θ1, and a spectral colorimeter in which a data conversion means (not shown) is connected to the spectral color measurement means 53.

In particular, when a directional light source such as an LED is used as the light source 58A, a spectrocolorimeter having such a configuration is preferable.
The light source 58A in such a spectrocolorimeter is not limited to the LED, and the light source mentioned above as the light source of the spectrocolorimeter using the integrating sphere can be selected and used as appropriate.

  As the illuminance adjustment mechanism 59, an ND filter, an optical filter, an electromagnetic filter, or the like can be used as in the illuminance adjustment mechanism 19 in the spectrocolorimeter using the integrating sphere described above.

In the spectrocolorimeter of this example, the reflection angle variable mechanism 55 includes a spectrocolorimeter 53 that can move so as to form an arbitrary reflection angle θ1.
Examples of the light detection sensor of the spectral colorimetric means 53 include those mentioned as the light detection sensor of the spectral colorimeter using the integrating sphere described above.

When the light source selection mechanism is provided in the spectrocolorimeter of this example, the light source selection mechanism is composed of a mechanism that changes the angles of the reflecting mirrors 52a and 52b so as to switch between the plurality of light sources provided. Can do.
When the colorimetric distance setting mechanism 57 is provided, the colorimetric distance setting mechanism 57 can appropriately move the spectral colorimetric means 53 along the direction in which the reflected light from the reflective electronic display medium 10 travels. It can consist of the mechanism of.
Furthermore, when the incident angle variable mechanism 56 is provided, the incident angle variable mechanism 56 can be an appropriate mechanism that changes the mounting angle of the reflective electronic display medium 10.

Using such a spectrocolorimeter, the visibility of the image on the reflective electronic display medium 10 is converted into a numerical value as follows.
That is, first, light is emitted from the illumination unit 52 in a state where the illuminance on the image on the reflective electronic display medium 10 is adjusted by the illuminance adjustment mechanism 59. This light passes through the diffuser plate 60 via the reflecting mirrors 52a and 52b, is scattered, and enters the colorimetric region of the reflective electronic display medium 10 as scattered light. The light incident on the colorimetric region of the reflective electronic display medium 10 is reflected by the reflective electronic display medium 10 and is moved to a position related to an arbitrary reflection angle θ1 by the reflection angle variable mechanism 55. The spectral distribution of the light incident on the light detection sensor in the means 53 is measured, and the data of the measured spectral distribution is transmitted to the data conversion means, and the data conversion means calculates the reflectance and / or the density. Is done.

DESCRIPTION OF SYMBOLS 10 Reflective type electronic display medium 11 Integrating sphere 11A Aperture 12 Illumination means 12A-12C Illuminator 13 Spectral colorimetry means 13A-13E Spectral colorimeter 14 Light scattering mechanism 15 Reflection angle variable mechanism 16 Incident angle variable mechanism 17 Colorimetric distance setting Mechanism 18 Light source selection mechanisms 18A to 18C Light source 18D Optical switching means 19 Illuminance adjustment mechanism 20 Data conversion means 22 Light transmittance changing filter groups 22A to 22E Optical filter 22α Axis 23 Photodetection sensor 23A Frustum 30 Colorimetric region 31 Reflected light 32 Incident light 40 Tilting plate 52 Illuminating means 52a, 52b Reflector 53 Spectral colorimetric means 55 Reflection angle variable mechanism 56 Incident angle variable mechanism 57 Colorimetric distance setting mechanism 58A Light source 59 Illuminance adjustment mechanism 60 Diffuser

Claims (11)

With respect to the image displayed on the reflective electronic display medium, the spectral distribution is measured by the spectral colorimetric means in a state illuminated by the illuminating means, and the reflectance of the image is converted by the data conversion means based on the obtained spectral distribution. An electronic display medium evaluation system that calculates density and / or evaluates the visibility of an image displayed on the electronic display medium based on the reflectance and / or density obtained by the calculation,
The angle θ1 formed between the reflected light from the electronic display medium for measuring the spectral distribution in the spectral colorimetric means and the electronic display medium can be set by a reflection angle variable mechanism,
An electronic display medium evaluation system, wherein the illumination means is provided with an illuminance adjustment mechanism to adjust illuminance in an image on the electronic display medium.   2. The electronic display medium evaluation system according to claim 1, wherein an angle θ <b> 1 that can be set by the reflection angle varying mechanism is in a range of 15 degrees to 90 degrees. The illumination means comprises at least three kinds of light sources having different color temperatures,
A light source selection mechanism for selecting one of these three or more light sources is provided.
3. The electronic display medium evaluation system according to claim 1, wherein the light source included in the illumination unit has a color temperature in a range of 1900K to 8000K. 4.   The electronic display medium evaluation system according to any one of claims 1 to 3, wherein a distance d of the spectral colorimetric means from the electronic display medium can be set by a colorimetric distance setting mechanism.   5. The electronic display medium evaluation system according to claim 4, wherein the distance d that can be set by the colorimetric distance setting mechanism is in a range of 30 mm to 500 mm.   6. The electronic display medium evaluation according to claim 1, wherein an angle [theta] 2 formed between the radiated light from the illumination unit and the electronic display medium can be set by an incident angle variable mechanism. system.   The electronic display medium evaluation system according to claim 6, wherein an angle θ <b> 2 that can be set by the incident angle variable mechanism is in a range of 15 degrees to 90 degrees.   The electronic display according to any one of claims 1 to 7, wherein an illuminance in an image on the electronic display medium that can be adjusted by the illuminance adjusting mechanism is in a range of 10 lux to 2000 lux. Media evaluation system.   9. The illuminance adjustment mechanism comprises an ND filter capable of adjusting illuminance over the entire wavelength range of the spectral distribution to be measured by the spectral colorimetric means. An electronic display medium evaluation system according to claim 1.   The electronic display according to any one of claims 1 to 9, wherein the emitted light from the illuminating means is scattered by a light scattering mechanism and applied to the electronic display medium in a scattered light state. Media evaluation system.   The electronic display medium evaluation system according to claim 1, wherein the electronic display medium is an electronic paper capable of performing white display.