Peripheral luminance adjustment device for display

Abstract

To provide a peripheral luminance adjustment device for a display that makes it possible to experience the same degree of brightness in a space as that of graphic display such as images on the display.SOLUTION: A peripheral luminance adjustment device for a display comprises a luminance adjustment device that is provided in a front space of a display that displays graphics, and adjusts the luminance on the periphery of the display when the display is seen from a position facing thereto. The luminance adjustment device includes a light emitting device that irradiates the space with light, and a control unit that adjusts the luminance of the light emitting device.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a peripheral brightness adjustment device for a display that adjusts the brightness of light in the space in front of a display that displays graphics such as video.

Background Art

[0002] Patent Document 1 discloses a system in which a pair of video display means is provided on the side of the front space of a display, and the video of the display is displayed on the pair of video display means.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the video display means of Patent Document 1, as the distance from the display increases, the area of the light output surface increases, and the brightness of the light perceived by the user decreases. Therefore, in the video display means of Patent Document 1, there is a possibility that the user cannot experience the brightness of the space comparable to the video of the display, and the sense of presence or immersion in the video of the display cannot be sufficiently obtained.

[0005] An object of the present invention is to provide a peripheral brightness adjustment device for a display that can experience the brightness of a space comparable to the graphic display such as video on the display.

Means for Solving the Problems

[0006] The peripheral brightness adjustment device for a display according to the present invention is provided in the front space of a display that displays graphics, and includes a brightness adjustment device that adjusts the brightness around the display when the display is viewed from a position facing it. The brightness adjustment device includes a light emitting device that irradiates light into the front space, and a control device that adjusts the brightness of the light emitting device.

[0007] According to the peripheral brightness adjustment device for a display of the present invention, it is possible to provide a brightness adjustment device and a brightness adjustment method that can experience the brightness of a space comparable to the graphic display such as an image on the display.

[0008] In one aspect of the present invention, the light emitting device extends from around the display in a direction facing it, and includes an upper light emitting portion, a lower light emitting portion, and a pair of side light emitting portions on an inner peripheral surface surrounding the space.

[0009] According to one aspect of the present invention, it is possible to improve the sense of presence or immersion of a user who views the graphics.

[0010] In one aspect of the present invention, the light emitting device includes a dimmable light source device that generates the light and guides the light to the inner peripheral surface, and a dimming film that forms the inner peripheral surface and adjusts the transmittance of the light guided in the direction of the space in the light source device. The control device adjusts the dimming rate of the light in the light source device and the transmittance of the light in the dimming film to make the brightness of the light emitting device follow the brightness of the display surface of the display.

[0011] According to one aspect of the present invention, it is possible to provide a brightness adjustment device and a brightness adjustment method that can experience the brightness of a space comparable to the graphic display such as an image on the display. Also, according to one aspect of the present invention, since it is possible to experience the brightness of a space comparable to the graphics such as an image on the display, it is possible to improve the sense of presence or immersion of a user who views the graphics.

Effects of the Invention

[0012] According to the present invention, it is possible to provide a peripheral brightness adjustment device for a display that can experience the brightness of a space comparable to the graphic display such as an image on the display.

Brief Description of Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0014] In FIGS. 1 to 3, the luminance adjustment device 1 according to the embodiment will be described. In the following drawings, the same members or parts or members or parts having the same function are denoted by the same reference numerals or the reference numerals are omitted. In addition, the front-rear, up-down, and left-right positional relationships of each component member of the luminance adjustment device 1 are, in principle, the positional relationships when each component member is installed in a usable state.

[0015] The luminance adjustment device 1 constitutes a peripheral luminance device for a display that adjusts the luminance of light in the space S in front of a display 100 (hereinafter sometimes referred to as a "display device") having a display surface 100a for displaying graphics such as images. Examples of the display 100 include, but are not limited to, a large-screen computer display, a television receiver, and the like. The display surface 100a of the display 100 may be any screen for displaying graphics such as images, and examples include, but are not limited to, a cathode ray tube screen, a liquid crystal screen, a plasma screen, or an organic EL (organic electroluminescence) screen. The graphics displayed on the display surface 100a of the display 100 are not particularly limited in content, and are, for example, images including videos, characters, numbers, symbols, or combinations thereof, and the images may be still images or moving images.

[0016] As shown in FIG. 2, when the display 100 is a computer display, the display 100 is connected to a computer 100b via a video control device 100c such as a video card. When the display 100 is a television receiver, these configurations may be omitted.

[0017] As shown in FIGS. 1 to 3, the luminance adjustment device 1 has a light emitting device 10. The light emitting device 10 extends from around the display 100 in a direction facing the display 100. The light emitting device 10 is arranged so as to surround the front space S of the display 100 in a state where the display surface 100a of the display 100 can be visually recognized from the direction facing the display 100. The light emitting device 10 has an upper light emitting portion, a lower light emitting portion, and a pair of side light emitting portions on the inner peripheral surface 10a that emits light into the space S. The light emitting device 10 is configured to emit light from the entire inner peripheral surface 10a of the light emitting device 10 toward the entire space S partitioned by the inner peripheral surface 10a of the light emitting device 10, that is, the entire front space S of the display 100. Note that the luminance adjustment device 1 may have a plurality of light emitting devices 10. For example, the luminance adjustment device 1 may have one light emitting device 10 on each of the upper surface, lower surface, right surface, and left surface of the luminance adjustment device, or may have more than one light emitting device 10.

[0018] As shown in FIGS. 1 to 3, the dimensions in the left-right direction and the up-down direction of the space S partitioned by the inner peripheral surface 10a of the light emitting device 10 are determined so that the user M can see the entire display surface 100a of the display 100. That is, the dimension W in the left-right direction of the space S is the same as or greater than the dimension in the left-right direction of the display surface 100a of the display 100. Also, the dimension in the up-down direction of the space S is the same as or greater than the dimension in the up-down direction of the display surface 100a of the display 100.

[0019] Further, the dimension D in the front-rear direction of the space S is determined based on the estimated height H0 of the line of sight of the user M and the estimated distance D0 between the display surface 100a of the display 100 and the user M. Note that when the display 100 is a large display, the estimated distance D0 is 1 m to 2 m, preferably 1.5 m.

[0020] The upper viewing angle θ with respect to the front direction of the human (user M) shown in FIG. 2 U is generally about 60 degrees at maximum. The lower viewing angle θ with respect to the front direction of the human (user M) D is generally about 70 degrees at maximum.

[0021] Also, the left viewing angle θ and the right viewing angle θ with respect to the front direction of the human (user M) shown in FIG. 3 L and the right viewing angle θ R are generally about 60 degrees at most. Here, as shown in FIG. 3, generally, it is considered that the user M views the content of the display surface 100a at a position that is half of the width W in the left - right direction of the display surface 100a.

[0022] Therefore, the dimension D in the front - rear direction of the space S is determined such that when the upper viewing angle θ U , the left viewing angle θ L , and the left viewing angle θ R are 60 degrees or more, and when the lower viewing angle θ D is 70 degrees or more, the inner peripheral surface 10a of the light - emitting device 10 covers the visual field of the user M. By determining the dimension D in the front - rear direction of the space S so as to cover the visual field of the user M, visual information other than the content on the display surface 100a of the display 100 and the luminance of the light by the light - emitting device 10 is blocked, and thus the user M can obtain a sufficient sense of presence and immersion regarding the content on the display surface 100a of the display 100.

[0023] As shown in FIGS. 1 to 3, the light - emitting device 10 has a dimmable light - source device 12. The light - source device 12 is formed on the outer - peripheral side of the light - emitting device 10. Although not shown, the light - source device 12 has a light - source unit that generates light and a light - guiding unit that guides the light generated by the light - source unit in the direction of the space S.

[0024] In the light source unit, the dimming rate of the light emitted from the light source unit is adjusted by the power supply control by the control device 20 described later. The dimming rate is defined as the ratio of the actual luminous flux value to the maximum luminous flux value that can be emitted from the light source unit. The dimming rate is set, but not limited to, a lower limit of 5 - 20% and an upper limit of 90 - 100%. The light source unit preferably has, but is not limited to, a plurality of light-emitting diodes (LEDs). By adopting a plurality of LEDs as the light source unit, it can be adjusted to emit substantially uniform light from the entire inner surface of the light-emitting device 10 toward the space S. Also, by using LEDs in the light source device 12, compared with the case where no LEDs are used in the light source device 12, the power consumption of the light source device 12 can be suppressed and the lifespan of the light source device 12 can be extended. Also, by using LEDs in the light source device 12, compared with the case where no LEDs are used in the light source device 12, it becomes possible to design the light source device 12 to be thin and lightweight.

[0025] The light source device 12 preferably can emit light uniformly over the entire inner peripheral surface 10a of the light-emitting device 10. A suitable example is an LED dimming panel. The LED dimming panel is formed as a rectangular panel and is a light source device formed to diffuse the light emitted from the LEDs and emit light uniformly from a rectangular surface. A plurality of LEDs are arranged on one side of the rectangular surface of the LED dimming panel, and light is emitted by the plurality of LEDs toward the opposite side. The plurality of LEDs can change the dimming rate by power supply control. On the surface of the LED dimming panel that is opposite to the light-emitting surface, a plurality of light guiding portions are provided that refract the light emitted from the plurality of LEDs and guide it toward the light-emitting surface of the LED dimming panel. The light guiding portions of the LED dimming panel are formed, but not limited to, by laser processing, dot printing, V-groove cutting, molding processing, etc. on the surface opposite to the light-emitting surface of the LED dimming panel. In the LED dimming panel, by providing light guiding portions on the surface opposite to the light-emitting surface of the LED dimming panel, the light-emitting surface of the LED dimming panel can be made to emit light uniformly.

[0026] Therefore, by adopting an LED dimming panel as the light source device 12, the light-emitting surface of the LED dimming panel can be made to emit light uniformly.

[0027] In addition, since no LEDs are arranged on the back side of the light-emitting surface of the LED dimming panel, compared with a backlight-type LED panel in which a plurality of LEDs are arranged in an array on the back side of the light-emitting surface, heat generation on the light-emitting surface can be suppressed, and the risk of LED damage due to impact can be reduced.

[0028] Note that the effect of the LED dimming panel compared with the backlight-type LED panel does not exclude the adoption of a backlight-type LED panel as the light source device 12. Depending on the use of the brightness adjustment device 1 and the like, it is naturally possible to adopt a backlight-type LED panel as the light source device 12.

[0029] As shown in FIGS. 1 to 3, the light-emitting device 10 has a dimming film 14. The dimming film 14 is disposed on the inner peripheral side of the light source device 12 and forms the inner peripheral surface 10a of the light-emitting device 10. The dimming film 14 adjusts the transmittance of the light guided in the direction of the space S in the light source device 12.

[0030] The dimming film 14 is an optical film that adjusts the transmittance of the light passing through the dimming film 14. The dimming film 14 is formed as a liquid crystal film, and by applying electricity, the alignment of the liquid crystal is changed, and a high transmittance mode (high transmittance) in which the transmittance is relatively large and a low transmittance mode (low transmittance) in which the transmittance is relatively small can be switched. That is, the dimming film 14 has two different transmittances, namely, a high transmittance mode (high transmittance) and a low transmittance mode (low transmittance). Note that the dimming film 14 may be switched from the low transmittance mode to the high transmittance mode by changing the alignment of the liquid crystal from imbalance to balance by applying electricity. Conversely, the dimming film 14 may be switched from the high transmittance mode to the low transmittance mode by changing the alignment of the liquid crystal from balance to imbalance by applying electricity.

[0031] The transmittance of the dimming film 14 is defined as the ratio of the radiant energy of the light emitted from the dimming film 14 to the radiant energy of the light incident on the dimming film 14 from the light source device 12. When the dimming film 14 is in the high transmittance mode, the transmittance is set to a specific value, for example, between 80% and 100% (not limited thereto), and when the dimming film 14 is in the low transmittance mode, the transmittance is set to a specific value, for example, between 10% and 30%.

[0032] As shown in FIG. 4, the dimming ratio of the light source device 12 varies between a minimum value D min and a maximum value D max As described above, the minimum value D min of the dimming ratio of the light source device 12 is set to a specific value, for example, between 5% and 20%, and the maximum value D max of the dimming ratio of the light source device 12 is set to a specific value, for example, between 90% and 100% (not limited thereto). As shown in FIG. 4(a), when the dimming film 14 is in the high transmittance mode, when the dimming ratio of the light source device 12 varies between the minimum value D min and the maximum value D max , the luminance of the light emitting device 10 varies proportionally between a minimum value L f-trance-min and a maximum value L f-trance-max . The maximum value L f-trance-max is, for example, 1200 (cd / m 2 ). Further, as shown in FIG. 4(b), when the dimming film 14 is in the low transmittance mode, when the dimming ratio of the light source device 12 varies between the minimum value D min and the maximum value D max , the luminance of the light emitting device 10 varies proportionally between a minimum value L f-opaque-min and a maximum value L f-opaque-max . Therefore, by providing the dimming film 14 to the light emitting device 10, the range of the luminance of the light emitting device 10 is greatly expanded as compared with the case where the dimming film 14 is not provided.

[0033] Further, the maximum value L f-opaque-max of the luminance of the light emitting device 10 in the low transmittance mode is equal to or greater than the minimum value L f-trance-min of the luminance of the light emitting device 10 in the high transmittance mode, that is, the following formula (1): L f-trance-min ≤ L f-opaque-max …(1) It is preferably satisfied. If the above formula (1) holds, the threshold value L for switching between the low transmittance mode and the high transmittance mode of the dimming film 14 threshold is given by the following formula (2): L f-trance-min ≤ L threshold ≤ L f-opaque-max …(2) can be preset, and by adjusting the dimming rate of the light source device 12, it becomes possible to continuously change the luminance of the light emitting device 10.

[0034] Note that the light emitting device 10 may be configured as a dimming glass with the dimming film 14 pasted between two glasses.

[0035] As shown in FIG. 2, the luminance adjustment device 1 includes a control device 20 that controls the luminance of the light emitting device 10. The control device 20 is communicably connected to the light source device 12, the dimming film 14, and the luminance sensor 30 by a wired or wireless connection.

[0036] The control device 20 is configured as a computer device, a microcomputer, dedicated hardware, or a combination thereof.

[0037] When the control device 20 is a computer device or a microcomputer, the control device 20 has a CPU (Central Processing Unit) or an MPU (Micro Processing Unit). When the control device 20 has a CPU or an MPU, each function executed by the control device 20 is realized by software, firmware, or a combination of software and firmware. Software or firmware is described as a program in a programming language. The program is stored in an internal memory (not shown) of the control device 20, and the program stored in the internal memory (not shown) is read out and executed by the CPU or the MPU. By the CPU or the MPU reading out and executing the program stored in the internal memory, each function in the control device 20 is realized. The internal memory (not shown) is a non-volatile or volatile semiconductor memory such as, for example, RAM, ROM, flash memory, EPROM, or EEPROM.

[0038] When the control device 20 is dedicated hardware, the control processing in the control device 20 is realized by, for example, a single circuit, a composite circuit, an ASIC (application specific integrated circuit), an FPGA (field-programmable gate array), or a circuit combining these. Each function realized by the control device 20 may be made realizable in individual hardware, or all of the functions may be made realizable in a single piece of hardware.

[0039] The luminance sensor 30 detects light emitted from a plurality of positions on the display surface 100a of the display 100 and a plurality of positions of the light-emitting device 10, and converts it into an electrical signal. The luminance sensor 30 is configured as, for example, a luminance camera. The luminance sensor 30 has an element such as a photodiode that detects light, and a signal processing circuit that processes the signal detected by the element. As shown in FIG. 2, the luminance sensor 30 is disposed in the vicinity of the user M, for example, at a position above the user M's head.

[0040] As shown in FIG. 5, the luminance sensor 30 has, as a functional block, a luminance detection unit 30a that detects the luminance at a plurality of positions on the display surface 100a of the display 100 and the luminance at a plurality of positions of the light emitting device 10. The luminance detection unit 30a can be implemented by an element that detects light and a part of a signal processing circuit that processes the signal detected by the element.

[0041] The detection positions and the number of detections of the luminance of the display surface 100a of the display 100 in the luminance detection unit 30a can be arbitrarily set. For example, a plurality of luminances on the display surface 100a of the display 100 can be obtained by dividing the display surface 100a into a plurality of regions and detecting the luminance at the center position of each region. Further, a plurality of luminances on the display surface 100a of the display 100 may be those obtained by detecting one luminance each from the peripheral portions of the display surface 100a, for example, the upper side, the lower side, the right side, and the left side of the display surface 100a.

[0042] The detection positions and the number of detections of the luminance of the light emitting device 10 in the luminance detection unit 30a can be arbitrarily set. For example, the luminance at a plurality of positions of the light emitting device 10 can be obtained by dividing the inner peripheral surface 10a of the light emitting device 10 into a plurality of regions and detecting the luminance at the center position of each region.

[0043] Also, the luminance at a plurality of positions of the light emitting device 10 may be detected from positions adjacent to the display 100. For example, one luminance each may be detected from positions adjacent to the display 100 on the upper surface, the lower surface, the left surface, and the right surface of the inner peripheral surface 10a of the light emitting device 10.

[0044] Note that the number of luminances at a plurality of positions of the light emitting device 10 acquired by the luminance detection unit 30a may be the same as or different from the number of a plurality of luminances on the display surface 100a of the display 100.

[0045] Further, the luminance sensor 30 has, as functional blocks, a display device average luminance calculation unit 30b and a light emitting device average luminance calculation unit 30c. The display device average luminance calculation unit 30b is a functional block that calculates the average value of a plurality of luminances on the display surface 100a of the display 100 detected by the luminance detection unit 30a. The light emitting device average luminance calculation unit 30c is a functional block that calculates the average value of the luminances at a plurality of positions of the light emitting device 10 detected by the luminance detection unit 30a. The display device average luminance calculation unit 30b and the light emitting device average luminance calculation unit 30c are implemented as part of a signal processing circuit, and are implemented, for example, as a microcomputer, dedicated hardware, or a combination thereof.

[0046] When the display device average luminance calculation unit 30b and the light emitting device average luminance calculation unit 30c are implemented in a microcomputer, they are implemented by an MPU. In the MPU, each function executed by the display device average luminance calculation unit 30b and the light emitting device average luminance calculation unit 30c is realized by software, firmware, or a combination of software and firmware. The software or firmware is described as a program in a programming language. The program is stored in an internal memory (not shown) of the signal processing circuit, and the program stored in the internal memory (not shown) is read out and executed by the MPU. By the MPU reading out and executing the program stored in the internal memory, each function is realized. The internal memory (not shown) is a non-volatile or volatile semiconductor memory such as, for example, RAM, ROM, flash memory, EPROM, or EEPROM.

[0047] When the display device average luminance calculation unit 30b and the light emitting device average luminance calculation unit 30c are implemented as dedicated hardware, the arithmetic processing is realized by, for example, a single circuit, a composite circuit, an ASIC (application specific integrated circuit), an FPGA (field-programmable gate array), or a circuit combining these. Each function realized by the display device average luminance calculation unit 30b and the light emitting device average luminance calculation unit 30c may be realized in individual hardware, or all of the functions may be realized in a single hardware.

[0048] Note that the display device average luminance calculation unit 30b and the light emitting device average luminance calculation unit 30c do not necessarily need to be implemented by the luminance sensor 30, and may be implemented by the control device 20.

[0049] The average value of the luminance calculated by the luminance sensor 30 is transmitted to the luminance comparison unit 20b via the receiving unit 20a of the control device 20. The receiving unit 20a of the control device 20 functions as a connection port connecting the control device 20 and the luminance sensor 30, and can be configured as, for example, a USB port. In the luminance comparison unit 20b, the difference between the average luminance in the display 100 and the average luminance in the light emitting device 10 is calculated. The control device 20 transmits a control signal based on the difference between the average luminance in the display 100 and the average luminance in the light emitting device 10 from the control device 20 to the light emitting device 10. Further, as will be described later, in the control device 20, the initial values of the dimming rate of the light source device 12 and the transmittance of the dimming film corresponding to the initial value of the average luminance in the display 100 are calculated from the initial value setting data table 40 (see FIG. 7). A control signal based on the initial values of the dimming rate of the light source device 12 and the transmittance of the dimming film is transmitted from the control device 20 to the light emitting device 10.

[0050] The light-emitting device 10 includes, as functional blocks, a light source device dimming rate changing unit 12a and a dimming film transmittance switching unit 14a. The light source device dimming rate changing unit 12a is configured to change the dimming rate of the light source device 12 based on a control signal transmitted from the control device 20. The dimming film transmittance switching unit 14a is configured to switch the transmittance of the dimming film 14 based on a control signal transmitted from the control device 20. The light source device dimming rate changing unit 12a and the dimming film transmittance switching unit 14a are implemented, for example, as a microcomputer, dedicated hardware, or a combination thereof. Since the specific implementation modes of the light source device dimming rate changing unit 12a and the dimming film transmittance switching unit 14a are the same as those of the display device average luminance calculation unit 30b and the light-emitting device average luminance calculation unit 30c described above, they are omitted here.

[0051] Next, the specific flow of the control process in this embodiment will be described with reference to FIG. 6. The control process in this embodiment is always being executed in the luminance adjustment device 1 in this embodiment.

[0052] As shown in step S1, when the power of the display 100 is off (''No'' in step S1) in the control process of this embodiment, a standby state is maintained until the power of the display 100 is turned on. Regarding the power of the luminance adjustment device 1, it only needs to be on when the power of the display 100 is turned on. For example, the power of the luminance adjustment device 1 may be turned on in conjunction with the power-on of the display 100, or may always be on.

[0053] In step S1, when the power of the display 100 is turned on (''Yes'' in step S1), in step S2, the initial value of the average luminance L around of the light-emitting device 10 is set. The average luminance L aroundThe initial value setting is made, for example, based on the initial value setting data table 40 shown in FIG. 7. In the initial value setting data table 40 shown in FIG. 7, a plurality of ranges of the average luminance on the display surface 100a of the display 100, the transmittance of the dimming film 14 corresponding to each of the plurality of ranges of the average luminance, and the dimming rate of the light source device 12 are defined. The average luminance L of the light emitting device 10 around The initial value setting is determined by the transmittance of the dimming film 14 and the dimming rate of the light source device 12 in the initial value setting data table 40. The transmittance of the dimming film 14 and the dimming rate of the light source device 12 corresponding to the average luminance on the display surface 100a of the display 100, which are calculated based on a plurality of luminances on the display surface 100a of the display 100, are determined based on the initial value setting data table 40. For example, when the average luminance on the display surface 100a of the display 100 is 900 (cd / m 2 ), the transmittance of the dimming film 14 is determined to be "high transmittance", that is, the high transmittance mode, and the dimming rate of the light source device 12 is determined to be "75%". Therefore, the initial value of the average luminance L of the light emitting device 10 around is uniquely determined. According to step S2, at the initial stage when the power of the display 100 is turned on, it is possible to prevent the average luminance of the display 100 from deviating from the average luminance of the light emitting device 10. Therefore, it is possible to avoid impairing the sense of presence or immersion of the user M who views the display surface 100a of the display 100.

[0054] Next, in step S3, the average luminance L on the display surface 100a of the display 100 display is calculated. The detection position of the luminance of the display 100 can be arbitrarily set.

[0055] Next, in step S4, it is determined whether the average luminance L on the display surface 100a of the display 100 display is equal to or greater than a predetermined threshold value L threshold . Whether the average luminance L display is greater than or equal to the threshold value L thresholdIf the above is the case (Yes in step S4), in step S5, the transmittance of the dimming film 14 is set to "high transmittance", that is, the high transmittance mode, and relatively high-brightness light is incident from the light-emitting device 10 into the space S. The average luminance L display is smaller than the threshold luminance L threshold (No in step S4), in step S6, the transmittance of the dimming film 14 is set to "low transmittance", that is, the low transmittance mode, and relatively low-brightness light is incident from the light-emitting device 10 into the space S. By switching between the high transmittance mode and the low transmittance mode in steps S4 to S6, the range of the luminance of the light incident from the light-emitting device 10 into the space S can be expanded, so that the sense of presence or immersion of the user M viewing the display surface 100a of the display 100 can be improved.

[0056] Next, in step S7, it is determined whether the average luminance L around of the light-emitting device 10 is greater than the value obtained by adding the allowable error L display to the average luminance L error on the display surface 100a of the display 100. The allowable error L error is not limited, but for example, it may be set to 2% of the average luminance L display , or in an environment where a stronger sense of presence or immersion is required, it may be set to 1% or less of the average luminance L display .

[0057] If the average luminance L around of the light-emitting device 10 is greater than the value obtained by adding the allowable error L display to the average luminance L error on the display surface 100a of the display 100 (Yes in step S7), the average luminance L around of the light-emitting device 10 becomes higher than the upper limit value of the allowable range of the average luminance L display on the display surface 100a of the display 100. Therefore, in step S8, the dimming rate of the light source device 12 is adjusted so that the average luminance L around of the light-emitting device 10 is subtracted by ΔL. For example, the dimming rate of the light source device 12 is adjusted to decrease by 1%.

[0058] The average luminance L of the light-emitting device 10around is less than or equal to the value obtained by adding the tolerance L to the average luminance L on the display surface 100a of the display 100 ( "No" in step S7), in step S9, it is determined whether the average luminance L of the light emitting device 10 display is less than the value obtained by subtracting the tolerance L error from the average luminance L on the display surface 100a of the display 100. around If the average luminance L of the light emitting device 10 display is less than the value obtained by subtracting the tolerance L error from the average luminance L on the display surface 100a of the display 100 ( "Yes" in step S9), it is determined that the average luminance L of the light emitting device 10

[0059] is lower than the lower limit value of the allowable range of the average luminance L on the display surface 100a of the display 100. Therefore, in step S10, the dimming rate of the light source device 12 is adjusted so that the average luminance L of the light emitting device 10 around is increased by ΔL. For example, the dimming rate of the light source device 12 is adjusted to increase by 1%. display from the average luminance L on the display surface 100a of the display 100. error If the average luminance L of the light emitting device 10 around is less than the value obtained by subtracting the tolerance L display from the average luminance L on the display surface 100a of the display 100 ( "Yes" in step S9), the average luminance L of the light emitting device 10 around becomes lower than the lower limit value of the allowable range of the average luminance L on the display surface 100a of the display 100. Therefore, in step S10, the dimming rate of the light source device 12 is adjusted so that the average luminance L of the light emitting device 10

[0060] is increased by ΔL. For example, the dimming rate of the light source device 12 is adjusted to increase by 1%. around If the average luminance L of the light emitting device 10 display is greater than or equal to the value obtained by subtracting the tolerance L error from the average luminance L on the display surface 100a of the display 100 ( "No" in step S9), the average luminance L of the light emitting device 10 around is within the tolerance L display of the average luminance L on the display surface 100a of the display 100. For example, if the tolerance L error is 2% of the average luminance L error , the average luminance L of the light emitting device 10 display is given by the following formula (3): around 0.98×L ≦L display ≦1.02×L around …(3) display …(3) will fall within the range. Therefore, in step S12, the average luminance L of the light-emitting device 10 around is maintained.

[0061] Steps S3 to S12 are repeatedly performed while the power of the display 100 is on in step S13 (``No'' in step S13). By repeating steps S3 to S12, the average luminance L of the light-emitting device 10 around can be made to follow the average luminance L display of the display surface 100a of the display 100.

[0062] When the power of the display 100 is turned off in step S13 (``Yes'' in step S13), the control process returns to the beginning, and a standby state is maintained until the power of the display 100 is turned on in step S1.

[0063] In the above description, for the luminance comparison, the average luminance L of the light-emitting device 10 around and the average luminance L on the display surface 100a of the display 100 display are used. However, as long as the luminance of the light-emitting device 10 can be made to follow the luminance of the display surface 100a of the display 100, it is also possible to perform it by other calculation methods. Also, the luminance of the light-emitting device 10 may be made to follow the luminance of the display surface 100a of the display 100 by using the luminance of an arbitrary point of the light-emitting device 10 and the luminance of an arbitrary point of the display surface 100a of the display 100.

[0064] Next, the luminance adjustment device of the present embodiment and the effects of the luminance adjustment device will be described.

[0065] The brightness adjustment device of the present embodiment is a brightness adjustment device 1 that adjusts the brightness of light in a space S in front of a display 100 having a display surface 100a for displaying graphics. The brightness adjustment device 1 includes a light emitting device 10 that surrounds the space S in a state where the display surface 100a is visible and has an inner peripheral surface 10a that emits light into the space S, and a control device 20 that controls the brightness of the light emitting device 10. The light emitting device 10 includes a dimmable light source device 12 that generates light and guides the light to the inner peripheral surface 10a of the light emitting device 10, and a dimming film 14 that forms the inner peripheral surface 10a of the light emitting device 10 and adjusts the transmittance of the light guided in the direction of the space S by the light source device 12. The control device 20 adjusts the light dimming rate of the light source device 12 and the light transmittance of the dimming film 14 to make the brightness of the light emitting device 10 follow the brightness of the display surface 100a of the display 100.

[0066] Further, the brightness adjustment method of the present embodiment is a brightness adjustment method for adjusting the brightness of light in a space S in front of a display 100 having a display surface 100a for displaying graphics. The brightness adjustment method uses a light emitting device 10 that surrounds the space S in a state where the display surface 100a is visible and has an inner peripheral surface 10a that emits light into the space S. The light emitting device 10 includes a dimmable light source device 12 that generates light and guides the light to the inner peripheral surface 10a of the light emitting device 10, and a dimming film 14 that forms the inner peripheral surface 10a of the light emitting device 10 and adjusts the transmittance of the light guided in the direction of the space S by the light source device 12. The brightness adjustment method includes a step of adjusting the light dimming rate of the light source device 12 and the light transmittance of the dimming film 14 to make the brightness of the light emitting device 10 follow the brightness of the display surface 100a of the display 100.

[0067] FIG. 8(a) shows a photograph of the display surface 100a of the display 100 when the average brightness of the display surface 100a of the display 100 is 164 (cd / m 2 ) and the periphery of the display surface 100a is a dark room B. FIG. 8(b) shows the average brightness of the display surface 100a of the display 100 as 164 (cd / m 2It shows a photograph of the display surface 100a of the display 100 when the average luminance of the light-emitting device 10 is made to follow the average luminance on the display surface 100a of the display 100.

[0068] In the case of Fig. 8(a), the average luminance within the user's visual field range (within the range of the circle in Fig. 8(a)) including the display surface 100a of the display 100 at the user's position is 86 (cd / m 2 ), which is lower than the average luminance on the original display surface 100a.

[0069] On the other hand, in the case of Fig. 8(b), the average luminance within the user's visual field range (within the range of the circle in Fig. 8(b)) including the display surface 100a of the display 100 at the user's position is 167 (cd / m 2 ), which is equivalent to the average luminance on the original display surface 100a. Therefore, in Fig. 8(b), it is possible to give the user an accurate sense of luminance.

[0070] Therefore, according to the luminance adjustment device and the luminance adjustment method of the present embodiment, it is possible to provide a luminance adjustment device and a luminance adjustment method that can experience the brightness of a space comparable to that of graphic displays such as videos on the display 100. Further, according to the luminance adjustment device and the luminance adjustment method of the present embodiment, since it is possible to experience the brightness of a space comparable to that of graphics such as videos on the display 100, the sense of presence or immersion of the user viewing the graphics can be improved.

[0071] In one aspect of the present embodiment, the luminance of the light-emitting device 10 is the average value of the luminance at a plurality of positions of the light-emitting device 10, and the luminance of the display 100 is the average value of the luminance at a plurality of positions on the display surface 100a of the display 100.

[0072] According to one aspect of the present invention, since it is possible to give the user an accurate sense of luminance, the sense of presence or immersion of the user viewing the graphics can be further improved.

[0073] In one aspect of the present embodiment, the dimming film 14 has two different transmittances, and the two different transmittances are switched based on a predetermined threshold value as a reference value.

[0074] According to one aspect of the present invention, since the luminance range of the light emitting device 10 can be extended, the range in which the luminance of the light emitting device 10 can follow the luminance of the display surface 100a of the display 100 is expanded. Therefore, according to one aspect of the present invention, the sense of presence or immersion of a user who views a graphic display such as an image on the display 100 can be further improved.

Description of Reference Numerals

[0075] 1 Luminance adjustment device, 10 Light emitting device, 10a Inner peripheral surface, 12 Light source device, 12a Light source device dimming rate change unit, 14 Dimming film, 14a Dimming film transmittance switching unit, 20 Control device, 20a Receiving unit, 20b Luminance comparison unit, 30 Luminance sensor, 30a Luminance detection unit, 30b Display device average luminance calculation unit, 30c Light emitting device average luminance calculation unit, 40 Initial value setting data table, 100 Display, 100a Display surface, 100b Computer, 100c Video control device.

Claims

1. A brightness adjustment device is provided in the front space of a display for displaying graphics, and when the display is viewed from its opposite position, the brightness adjustment device adjusts the brightness around the display. The brightness adjustment device includes a light-emitting device that irradiates light into the front space, and a control device that adjusts the brightness of the light-emitting device. A peripheral brightness adjustment device for a display.

2. The light-emitting device extends from around the display in a direction facing the opposite side, and includes an upper light-emitting portion, a lower light-emitting portion, and a pair of side light-emitting portions on an inner peripheral surface surrounding the front space. The peripheral brightness adjustment device for a display according to Claim 1.

3. The light-emitting device includes a dimmable light source device that generates the light and guides the light to the inner peripheral surface, and a dimming film that forms the inner peripheral surface and adjusts the transmittance of the light guided in the direction of the space in the light source device. The control device adjusts the dimming rate of the light in the light source device and the transmittance of the light in the dimming film to make the brightness of the light-emitting device follow the brightness of the display surface of the display. The peripheral brightness adjustment device for a display according to Claim 2. ​ ​

Images