JP2008102483A - Image display system and image display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display system and an image display device capable of displaying an image with high luminance, high contrast, a high grayscale degree and a color gamut in a large screen by a simple configuration compared to prior arts. <P>SOLUTION: The image display system displays an image by detachably fixing a printed material having translucency on the display screen. The system includes display unit having a display screen and a plurality of solid light emitting elements, a density value reading unit that detects the density value of the printed material having the translucency, and a controlling unit that sets the controlled value of the solid light emitting element correspondingly to the density value, wherein the plurality of light emitting elements irradiate the printed material with light corresponding to the controlled value. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an image display system and an image display apparatus that display a multi-gradation image, and more particularly to an image display system and an image display apparatus suitable for high gradation display.

In recent years, image quality improvement in electronic display devices such as LCD (Liquid Crystal Display), EL (Electroluminescence Display), CRT (Cathode Ray Tube), and projection display devices has been remarkable, and the resolution color gamut is almost comparable to human visual characteristics. Devices with performance are being realized.
However, with regard to the luminance dynamic range, the reproduction range is at most about 1 to 102 [nit], and the number of bits expressing the gradation is generally 8 bits.
On the other hand, human vision has a range of luminance dynamic range that can be perceived at a time of about 10-2 to 104 [nit] and a luminance discrimination ability of 0.2 [nit], which corresponds to this luminance discrimination ability. Thus, when the range of the luminance dynamic range is converted into the number of gradations, it is said that a data amount corresponding to about 12 bits is required.

When viewing the display image of the current electronic display device via the visual characteristics as described above, the narrowness of the luminance dynamic range is conspicuous, and in addition, the resolution of the gradation of the shadow part and the highlight part is insufficient. , You will feel unsatisfactory with the reality and power of the displayed image.
In addition, in CG (Computer Graphics) images used in movies, games, etc., the movement for pursuing the reality of depiction by providing data with a luminance dynamic range and gradation characteristics close to human vision is becoming mainstream. is there.

However, since the performance of the electronic display device is insufficient, when the image of the CG content is displayed, the image expressive power (the number of bits for expressing gradation) that the CG content originally has is sufficiently exhibited. There is a problem that can not be done.
Furthermore, in the next Windows (registered trademark), the adoption of a 16-bit color space is planned, and the dynamic range and the number of gradations are dramatically increased as compared with the current 8-bit color space. For this reason, it is considered that there is an increasing demand for realizing a high dynamic range and high gradation electronic display device capable of fully utilizing the 16-bit color space in CG content.

As an electronic display device, there is a device that realizes display of a very high dynamic range by combining a backlight of an LED array light source capable of dimming for each LED and an optical modulation element such as a liquid crystal display device. Yes (see, for example, Patent Document 1).
As another electronic display device, a full-color LED display using a plurality of color LED elements is used as a large-screen display used in a baseball field, a soccer field, or the like.
JP-T-2005-520188

However, since the display of Patent Document 1 uses an optical modulation element, there are restrictions on the academic modulation element in each evaluation item such as display resolution, display area, display luminance, contrast performance, viewing angle performance, and manufacturing cost. It has the disadvantage of becoming larger.
In particular, in this display, when a display screen having a diagonal size exceeding 50 inches is taken into consideration, the problem due to the above-described restriction becomes significant.
The full-color LED display can display an image with a plurality of colors, but for example, when displaying an image with a luminance exceeding 4000 nits using the current full-color LED, a size of about 1 cm is required. It will be very low.

  The present invention has been made in view of such circumstances. With a simple configuration, it is possible to display an image with higher brightness, higher contrast, higher gradation, and higher color gamut than a conventional example on a large screen. An object is to provide an image display system and an image display device.

An image display system of the present invention is an image display system that displays an image by detachably fixing a translucent printed matter to a display surface, and has a display surface and a display unit including a plurality of solid state light emitting elements; A density value reading unit that detects a density value of a printed matter having translucency; and a control unit that sets a control value of the solid state light emitting element corresponding to the density value, and the plurality of solid state light emitting elements include: The printed matter is irradiated with light corresponding to the control value.
With this configuration, according to the image display system of the present invention, when image display on a large screen, for example, a screen exceeding 50 inches diagonal is taken into account, the resolution of the image is realized with a printed matter having translucency, Since the brightness of each image is complemented by the light emitted by the solid-state light emitting device, it can be used for a wide range of evaluation items such as image display resolution, display area, display brightness, contrast performance, gradation, color gamut, viewing angle performance, and cost. Thus, it is possible to perform image display with higher performance than the conventional example.

That is, according to the image display system of the present invention, since a printed matter having translucency that emits color by absorbing light with ink and a solid-state light emitting element that emits light directly by light emission are used in combination, there are mutual disadvantages. Therefore, the image display performance can be improved. Here, since the ink of the printed matter absorbs light, it is preferable to tighten black in a particularly bright environment, but it is difficult to express the brightness of the image. In contrast, solid-state light-emitting elements are good at producing bright-side radiance (visual stimulation that they are shining), but the black side is completely black because the solid-state light-emitting element itself turned off corresponds to black. Cannot be expressed.
The image display system of the present invention uses only the advantages of the printed matter and the solid-state light-emitting element described above, and can realize both blackness of an image by printing and brilliance by light emission. By irradiating the printed matter with light from the solid-state light emitting device, it is possible to reproduce the state in which the image is displayed.

Further, according to the image display system of the present invention, the resolution of the printed material can be very high in terms of resolution as described above, and the image of the printed material mainly determines the display resolution, and the solid state light emission. Even if the element side has a low resolution, the final display result can realize a high-resolution image.
Further, according to the image display system of the present invention, since the printed matter can be attached to and detached from the display surface, it can be used as a normal solid light source display when the printed matter is not attached. It can be used effectively according to the situation, and the return on investment can be improved compared to the conventional example.

The image display system according to the present invention is characterized in that the solid-state light emitting element is configured as a light source capable of emitting a plurality of colors of color light.
With this configuration, according to the image display system of the present invention, it is possible to detect the density value of each of the plurality of colors of the image on the printed material from the reflected light from the printed material for each of the color lights of a plurality of colors, and the contrast, color gamut, gradation In addition to the state in which the dynamic range is very wide, the characteristics and visual characteristics can be improved, and the displayed image can be brought closer to the state of viewing in the real world as compared with the conventional example.

In the image display system of the present invention, the density value reading unit includes a light receiving element provided for each solid light emitting element, and detects the density value of each image based on the intensity of light received by the light receiving element. It is characterized by.
With this configuration, according to the image display system of the present invention, the light receiving element arranged corresponding to the position of each solid light emitting element causes the printed matter to be reflected by the reflected light from the printing surface that has received the light emitted from the solid emitting element. Therefore, it is possible to accurately detect the density value of the image in the above, and to easily control the light emission intensity for each solid-state light emitting element.

The image display system of the present invention is characterized in that the density value reading unit detects the density value of each pixel from the light intensity reflected from the printed matter of the light receiving element when the solid light emitting element emits light. .
With this configuration, according to the image display system of the present invention, when the solid-state light emitting element irradiates light on the image of the printed matter, the density value reading unit is printed by the light intensity of the reflected light reflected by the printed matter. Since the density value of the image is detected, the light intensity at the position corresponding to each solid state light emitting element can be detected accurately, and no light source for detecting the density of the printed matter is required, so the cost of the apparatus Can be reduced.

In the image display system of the present invention, the solid-state light emitting element is a light source capable of sequentially emitting a plurality of color lights for each color light, and the density value reading unit is configured to emit light of each color from the printed matter of the light receiving element. The light intensity is detected, and density values of a plurality of colors of the image are detected.
With this configuration, according to the image display system of the present invention, the density values of a plurality of colors in the printed image can be accurately detected for each color light, and the emission intensity of the solid state light emitting element that irradiates the printed image at the time of display. Can be controlled in accordance with the density value of the detected image, the dynamic range can be expanded, the color gamut can be expanded, and a state that can be seen in the real world can be obtained.

The image display system of the present invention is characterized in that a density value is detected by superimposing a highly diffusible reflector on a printed material.
With this configuration, according to the image display system of the present invention, the light transmitted through the printed matter is reflected by the reflecting plate, and is again transmitted through the printed matter and is input to the light receiving element. Reflected light whose value can be detected can be obtained.

In the image display system of the present invention, the control unit detects, in the printed material, a region having a lower density value than other regions as an additional display region, controls the solid state light emitting element in the additional display region, It is characterized by displaying different information.
With this configuration, according to the image display system of the present invention, movement and additional information cannot be expressed in the printed matter itself. However, by controlling the solid state light emitting element, additional information including characters, for example, information including characters. Is displayed as an image, information can be added to the image of the printed material, and a motion can be given to the printed material that does not move.

In the image display system of the present invention, the control unit controls the solid-state light emitting element with a color opposite to the color detected in the additional display area, and displays information different from the printed matter.
With this configuration, according to the image display system of the present invention, information different from the printed image (for example, including characters and images) is displayed in the color opposite to the color of the display area. Can clearly see the display added to the printed matter.

An image display device of the present invention is an image display device that detachably fixes a translucent printed matter to a display surface and displays an image, and includes a display unit that includes the display surface and includes a plurality of solid state light emitting elements; A light receiving element that receives reflected light from the printed matter, and the plurality of solid state light emitting elements irradiate the printed matter with light according to a detection result of the light receiving element.
With this configuration, according to the image display device of the present invention, the printed matter that emits color by the absorption of light by the ink and the solid-state light emitting element that emits light directly by light emission are used in combination. Thus, the performance of image display can be improved. Here, since the ink of the printed matter absorbs light, it is preferable to tighten black in a particularly bright environment, but it is difficult to express the brightness of the image. In contrast, solid-state light-emitting elements are good at producing bright-side radiance (visual stimulation that they are shining), but the black side is completely black because the solid-state light-emitting element itself turned off corresponds to black. I can't see you.
The image display system of the present invention uses only the advantages of the printed matter and the solid-state light-emitting element described above, and can realize both blackness of an image by printing and brilliance by light emission. It is possible to reproduce a state with a very wide dynamic range in the displayed image.

The image display system according to the present invention is an array of light emitting elements that emit light of a plurality of colors as solid state light emitting elements, for example, full-color LEDs composed of R (red), G (green), and B (blue) light emitting elements. This is a system that displays images on a side-by-side display unit, and has an attachment / detachment mechanism that detachably attaches (fixes), for example, transmissive or translucent prints (including films) that are translucent to the display unit. Then, the attached printed material is sequentially irradiated with multiple colors of color light by a full-color LED, and the density values of the multiple colors of the image are detected from the reflected light of each color light from the printed material. The color value is corrected by irradiating light corresponding to the density value for each color light, and the dynamic range is expanded. The full color LED can display light emitting elements of each color constituting individually or in combination.
Various mechanisms are conceivable as the attachment / detachment mechanism, and detailed description thereof is omitted. For example, a sandwich structure in which the entire surface of the printed material is sandwiched between the transparent plate and the display unit or the outer periphery of the printed material is arranged. There is a mechanism to attach only by the frame part.
Moreover, as a printed matter, in addition to a general silver salt reversal film and a Colton film, a transmissive or semi-transmissive film on which an image is printed by an inkjet printer or the like is used.

<First Embodiment>
Hereinafter, an image display system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration example of the embodiment.
In this figure, the image display system includes a density value reading unit 11, a control unit 12, an LED driving unit 13, a photodiode array unit 14, an LED array unit 15 (display unit), a table storage unit 16, and a density value storage unit 17. Have.

Here, as shown in FIG. 2, the LED array unit 15 is configured by a plurality of full-color LEDs 100 arranged in a matrix, and the photodiode array unit 14 is a photodiode 101 (light receiving element) arranged for each of the full-color LEDs 100. It is composed of
In the present embodiment, the full color LED 100 is 1 cm × 1 cm (1 cm square).
Further, the photodiode 101 is disposed adjacent to each of the full color LEDs 100, and a sensor having a diameter of 3.3 mm is used.

After the printed material is attached to the display unit including the LED array unit 15, a control signal indicating that the user has finished the attachment is given to the control unit 12 by an input device (not shown).
The control unit 12 outputs a density value detection control signal to the LED driving unit 13 and the density value reading unit 11.
When the density value detection signal is input, the LED driving unit 13 causes the full color LED to sequentially emit light for each color component of a plurality of colors (R, G, B) for density reading. That is, as described above, the full-color LED 100 can cause the light-emitting elements to emit light sequentially, and sequentially emit light of a plurality of colors to the full-color LED for each color light.

In the photodiode 101, light (for each color component of R, G, B) sequentially emitted for each color light of the full-color LED 100 is incident on the printed matter, and the reflected light for each colored light from the back surface of the printed matter is received and received. The measurement value corresponding to the light intensity is output. That is, the photodiode 101 detects the light intensity for each color light of a plurality of colors as reflected light from the printed material. This reflected light corresponds to the density value of the image. When the density value is high, the amount of light reflected by absorption decreases, and the light intensity value of the light input to the photodiode 101 is relatively small. When the value is small, light is not absorbed so much, and thus the amount of light reflected increases, and the value of the light intensity of the light input to the photodiode 101 becomes relatively large.
The density value reading unit 11 synchronizes with the timing at which the LED driving unit 13 emits each color light to the LED array unit 15, and the measurement value (from the photodiode 101 for each color light) when the LED array unit 15 emits light ( The density value (digital value) corresponding to the voltage value (analog value) is obtained, and the region information of the corresponding full-color LED 100 is added and output.
Here, for example, the density value reading unit 11 has a correspondence table of light intensity values (measured values) and density values for each color light of a plurality of colors (R, G, B), and is input. A density value corresponding to the light intensity value is output for each color light of a plurality of colors (R, G, B).

With the configuration described above, the density reading unit 11 reads the light reflected from the printed matter by the photodiode array unit 14, so that the density value of the image in each area where the photodiode 101 is arranged is output from the full color LED 100. Each of R, G, and B is detected by the incident light.
The density reading unit 11 writes and accumulates the detected density value in the density value storage unit 17 in association with the detected area information (pixel position when the full-color LED 100 is regarded as a pixel).
The control unit 12 sequentially reads out the density value of the area indicated by the area information from the density value storage unit 17 for each area information, and from the control value table (lookup table for color processing) of the table storage unit 16. Then, the control values of the R, G, and B light emitting elements of the full color LED 100 corresponding to the density value are read out.

Further, the control unit 12 outputs the control value and the area information to the LED driving unit 13. The LED drive unit 13 corresponds to the full color LED 100 of each LED array unit 15 corresponding to the region information and the control value, and the full color LED 100 at a position corresponding to the region information according to the control value for each of R, G, and B. Drive with light emission intensity to emit light.
With the above-described configuration, multiple colors of color light emitted from the full-color LED 100 are emitted from the back surface of the printed material as a backlight, thereby expanding the brightness and color gamut of the image printed on the printed material, which is higher than that of the conventional example. It is possible to display an image with brightness / high contrast / high gradation / wide color gamut.

FIG. 3 shows an image display example by the image display system in the present embodiment described above.
When the printed matter at the upper left of the figure is attached to the display unit and control information is input to the control unit 12, the density value reading unit 11 reads the density information of each region corresponding to the full color LED 100 by the photodiode 101.
And the control part 12 determines a control value based on the said density | concentration information, makes the full color LED100 of the LED array part 15 light-emit by the determined control value corresponding to each area | region information, FIG. The “LED display” image is displayed.

As shown in FIG. 2, the LED array unit 151 has 1 cm square full-color LEDs 100 arranged in a matrix with a period of 2 cm, and the display resolution is set to be considerably lower than the image printed on the printed matter. This is a broad display as shown in the upper right image. The display of the LED array unit 15 is a backlight of a plurality of color lights illuminating from the back of the printed matter. The luminance of the backlight (the luminance for each color light of the R, G, and B light emitting elements) and the color of the image of the printed matter. Are combined, and an image with very high brightness, high contrast, high gradation, and a wide color gamut can be displayed as shown in the “final display result” diagram at the bottom of the diagram.
In addition, since the resolution of the LED array 15 is low, it is considered that the substantial display resolution of the printed matter is lowered when the display area becomes very large. As a result, the display resolution is increased, and a display result with a more detailed sense of contrast can be obtained.
In the image display system of the present embodiment, a highly diffusible reflector is stacked on the printed matter, and the light transmitted through the printed matter is reflected by the reflector, and the light that is again transmitted through the printed matter and input to the light receiving element. You may comprise so that it may receive with the photodiode 101. FIG. Thereby, the photodiode 101 can obtain the intensity of the reflected light that can detect the density value of the image even for an image with little reflected light.

Next, the operation of the image display system according to the present embodiment will be described with reference to FIGS. 1 and 4. FIG. 4 is a flowchart showing an operation example of the image display system of FIG.
A user attaches a printed matter, for example, a film to the front part in the irradiation direction of the LED array 15 as a display unit, and inputs control information to the control unit 12 (step S1).
When the control information is input, the control unit 12 starts a process for detecting the density value of the image of the printed material. Here, the control unit 12 controls the LED driving unit 13 to read the density of the red component (R) of the printed matter, and emits red (R) light to all the full-color LEDs 100 of the LED array 15. That is, it is displayed (step S2). At this time, the control unit 12 drives each full-color LED 100 to emit light with light intensity based on a control value (for example, voltage value) set in advance for measurement.

Then, the density value reading unit 11 sequentially obtains the density value of the red component corresponding to the light intensity received by the photodiode 101 (the intensity of the reflected red light) for each arrangement position, and indicates the arrangement position of each photodiode 101. Corresponding to the area information, it is stored in the density value storage unit 17 (step S3).
When the detection of the density value of the red component of the printed material by the photodiode 100 corresponding to all the full-color LEDs 100 is completed, the control unit 12 reads the density of the green component (G) of the printed material via the LED driving unit 13 to read the density of the green component (G). Green (G) light is emitted, that is, displayed on all the full-color LEDs 100 of the array 15 (step S4).
The density value reading unit 11 sequentially obtains the density value of the green component corresponding to the light intensity received by the photodiode 101 (the intensity of the green reflected light), and corresponds to the area information indicating the arrangement position of each photodiode 101. And stored in the density value storage unit 17 (step S5).

When the detection of the density value of the green component of the printed matter by the photodiodes 100 corresponding to all the full-color LEDs 100 is completed, the control unit 12 reads the density of the blue component (B) of the printed matter via the LED driving unit 13 to Blue light (B) is emitted, that is, displayed on all the full-color LEDs 100 of the array 15 (step S6).
The density value reading unit 11 sequentially obtains the density value of the blue component corresponding to the light intensity (the intensity of the blue reflected light) received by the photodiode 101, and corresponds to the area information indicating the arrangement position of each photodiode 101. And stored in the density value storage unit 17 (step S7).

Next, when the measurement of the concentration values of the R, G, and B components is completed, the control unit 12 obtains control values for causing the R, G, and B light emitting elements to emit light for each full color LED 100.
Here, the control unit 12 sequentially reads out the density values of R, G, B for each area information, and obtains the control values of the R, G, B light emitting elements of the full color LED 100 corresponding to the density values (step). S8).
And the control part 12 outputs the control value of each R, G, B light emitting element of each full color LED100 to the LED drive part 13 sequentially.
When the control value is input, the LED driving unit 13 drives the full-color LED 100 corresponding to the area information to emit light corresponding to the control value (step S9).

In the above-described step S8, the method for obtaining the control value from the simplest density value is the same control value as the density value, that is, the method of directly converting the density value to the control value by a D / A converter (not shown). .
However, since the display characteristics (light absorption characteristics) of printed matter vary depending on the media (film), ink, and the like used, it is desirable to adopt a determination method that takes into account the characteristics.

  That is, the control unit 12 sequentially reads the measured density values for R, G, and B for each area information from the control value table from the table storage unit 16 in which the density value and the control value are stored correspondingly. However, the read density values of R, G, and B are used as reference values, and control values for controlling the emission intensities of the R, G, and B light emitting elements of the full-color LEDs corresponding to the reference values are read out. The table storage unit 16 is a control value table in which the R, G, and B density values obtained as a result of reading the printed matter are used as reference values, and the control values of the emission intensity of each of the R, G, and B light emitting elements in the full color LED 100 are determined. A 3D-LUT (three-dimensional lookup table) is stored.

Also, a look-up table 3D-LUT in which density values are associated with control values measured in advance so that the display is close to the real world state using print samples for each type of material such as media or ink. A method may be used in which a plurality of types of 3D-LUTs corresponding to each type of printed matter are switched and used as necessary.
This makes it possible to adjust the light emission intensity of the full-color LED 100 that complements the brightness value for each type of material, such as media or ink, so that an optimal image display result corresponding to each printed matter can be obtained. is there.
At this time, the user may switch with a switch according to the combination of the media and ink, etc., and identification information indicating the type is recorded in advance on the printed matter, and a reading unit (not shown) reads the identification information, You may make it switch to a corresponding lookup table.

<Second Embodiment>
Next, as shown in FIG. 5, a second embodiment will be described in which image information including characters is additionally displayed using a part of the printed matter as an additional display area. FIG. 5 is a conceptual diagram showing an example in which additional information is displayed by the full color LED 100, for example, information is displayed by characters or the like.
The system configuration and operation are the same as those of the first embodiment shown in FIGS. 1 and 2, and only operations different from those of the first embodiment will be described.
When the character display as shown in FIG. 5 is performed, even if the full color LED 100 on the back surface of the printed material is displayed at a high luminance in a portion where the density of the printed material is high (relatively low transmittance), it is finally obtained. In other words, the display brightness of the characters that pass through the printed material is lowered, and it is not possible to visually recognize whether the characters are displayed or not.

Therefore, the control unit 12 reads the density value for each area information from the density value storage unit 17, and detects an area where the density value of the printed image is low and has a certain area as an additional display area.
Then, the control unit 12 reads the additional information from the internal storage unit, and displays the additional information in the detected additional display area. This additional information is previously input to the control unit 12 by the user. This additional information is information different from the printed material and includes, for example, information such as characters and images.
Since the additional information is displayed in the region where the density value is low by the above-described processing, it is necessary for any person to visually recognize and make a conspicuous display.

Further, the control unit 12 detects an opposite color to the color of the highest density value in the additional display area, and displays the detected opposite color on the full color LED 100 with a preset control value.
As a result, the additional information is displayed in a color opposite to that of the additional display area, so that the display can be made more conspicuous.
For example, referring to the conceptual diagram of FIG. 5, it is detected that the upper left portion is an area having a low density value, and an image of additional information is displayed in the detected additional display area.
Further, when it is detected that the upper left region is, for example, a light blue region, the character color to be added and displayed is set to yellow, which is the opposite color of blue, and is displayed more conspicuously. be able to.

Next, the operation of the second embodiment will be described with reference to FIGS. FIG. 6 is a flowchart illustrating an operation example of the image display system according to the second embodiment.
As in step S1, a film is attached to the display unit (step S11), and the density value of the printed image is measured by the operations from step S2 to step S7 (step S12).
And the control part 12 makes each full color LED100 light-emit via the LED drive part 13 by the process similar to step S8 and S9 (step S13, S14).

Next, the control unit 12 performs an additional display area extraction process for detecting an area Q in which the density of the image of the printed material is relatively lower than the other parts (step S15).
Here, the control unit 12 obtains the average density at each position by shifting the detection window having the same size as the additional display area set in advance to display the additional information for each area information. The detection window area at a position where the average density is low is extracted as the additional display area Q.

When the additional display area Q is extracted, the control unit 12 reads out an information display pattern to be displayed in the additional display area Q as additional information from the internal storage unit, and sets a display position for displaying the information display pattern (step). S16).
For example, the following description will be made with a display operation in which the information display pattern is moved and displayed in the additional display area Q as a row.
In step S16, the control unit 12 determines that the end TS (information display pattern start end) of the information display pattern in the moving direction H is opposite to the end QS (additional display area Q of the additional display area Q). The start position (the position of the full color LED 100) is set to be the start end.

Next, the control unit 12 detects the color densities of R, G, and B at each position where each pixel of the information display pattern is displayed, and determines the color opposite to the most dense color as the pixel of the information display pattern. The display color is determined.
The additional information control value of the display color for which the information display pattern is determined and the control value of each area information of the additional display area Q are added, and the obtained addition control value is passed through the LED driving unit 13. The full color LED 100 corresponding to the area information is caused to emit light, and display of the information display pattern is started (step S17).

  When the display is started, the control unit 12 shifts the information display pattern from the one end QS (start end) of the additional display area Q to the other end QE by one area information by a certain period of time. Then, by detecting that the end TE (end) of the information display pattern is displayed on the full-color LED 100 at the position of the other end QE (end), the end of display of this information display pattern is determined (step S18). . That is, the control unit 12 assumes that the display of the right end of the information display pattern starts sequentially from the left end of the information display area Q.

The control unit 12 detects whether or not the left end TE of the display information pattern matches the right end QE of the additional display area Q after a fixed period has elapsed. Exit. On the other hand, when the control unit 12 detects that the left end TE of the display information pattern does not coincide with the right end QE of the additional display region Q, the control unit 12 shifts the display position of the information display pattern to the right by one full color LED 100. The process returns to step S16.
In the above-described processing, the direction of movement of the information display pattern may be reversed left or right, or may be changed up and down.
Further, the control unit 12 may display the information display pattern so that the entire information display pattern is included in the additional display area Q, and end the display when a preset display time has elapsed after the display is started.

  In the first and second embodiments described above, the configuration of the image display system having the configuration of FIG. 1 has been described. However, the LED array unit 15, the LED driving unit 13, the photodiode array unit 14, and the altitude value reading unit are described. 11, the control unit 12, the table storage unit 16, and the density value storage unit 17 may be configured on a personal computer.

  A program for realizing processing and functions other than digital / analog conversion in the control unit 12 and the density value reading unit 11 in FIG. 1 is recorded on a computer-readable recording medium, and recorded on this recording medium. The image display control process may be performed by causing the computer system to read and execute the program. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer system” includes a WWW system having a homepage providing environment (or display environment). The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” refers to a volatile memory (RAM) in a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included.

  The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

It is a block diagram which shows the structural example of the image display system by the 1st and 2nd embodiment of this invention. It is a conceptual diagram which shows the planar arrangement | positioning in the display part of the LED array part 15 and the photodiode array 14 in FIG. It is a conceptual diagram which shows an example of the image display in this embodiment. It is a flowchart which shows the operation example of the image display in the 1st Embodiment of this invention. It is a conceptual diagram which shows the example of a display of the additional information in 2nd Embodiment. It is a timing chart which shows the operation example of the image display by the 2nd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Density value reading part 12 ... Control part 13 ... LED drive part 14 ... Photodiode array part 15 ... LED array part 16 ... Table memory | storage part 17 ... Density value memory | storage part 100 ... Full color LED 101 ... Photodiode

Claims (9)

An image display system for fixing a translucent printed matter to a display surface so as to be detachable and displaying an image.
A display unit having a display surface and including a plurality of solid state light emitting elements;
A density value reading unit for detecting a density value of the translucent printed matter;
A control unit that sets a control value of the solid state light emitting element corresponding to the concentration value,
The image display system, wherein the plurality of solid state light emitting elements irradiate the printed matter with light corresponding to the control value.   The image display system according to claim 1, wherein the solid-state light emitting element is configured as a light source capable of emitting a plurality of colors of light.   The density value reading unit includes a light receiving element provided for each solid light emitting element, and detects the density value of each image based on the intensity of light received by the light receiving element. The image display system according to claim 2.   The image display according to claim 3, wherein the density value reading unit detects the density value of each pixel from the light intensity reflected from the printed matter of the light receiving element when the solid light emitting element emits light. system. The solid-state light emitting device is a light source capable of sequentially emitting a plurality of colors of color light for each color light,
5. The image display system according to claim 4, wherein the density value reading unit detects a light intensity when each color light is emitted from the printed matter of the light receiving element, and detects density values of a plurality of colors of the image. .   6. The image display system according to claim 1, wherein a density value is detected by superimposing a highly diffusive reflector on the printed material.   The control unit detects, in the printed material, a region having a lower density value than other regions as an additional display region, controls a solid state light emitting element in the additional display region, and displays information different from the printed material. The image display system according to any one of claims 3 to 6.   The image display system according to claim 7, wherein the control unit controls the solid-state light emitting element with a color opposite to the color detected in the additional display area, and displays information different from the printed matter. . An image display device that detachably fixes a translucent printed matter to a display surface and displays an image.
A display unit having the display surface and comprising a plurality of solid state light emitting elements;
A light receiving element that receives reflected light from the printed matter, and
The plurality of solid state light emitting elements irradiate the printed matter with light according to the detection result of the light receiving element.

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