JP2007248981A - False full color display device and road sign - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve image display similar to that of full colors only by using two sorts of LEDs without using LEDs of three primary colors. <P>SOLUTION: One pixel is formed by a pair of two-color LEDs constituted so that a red LED 11 and a blue-green LED 12 are arranged adjacently in an oblique direction so as not to be superposed in a horizontal direction, respective pixels are arrayed in a matrix to form a vertical display screen and the light-emitting gradation of the blue-green LED 12 is set twice as large as the light emitting gradation of the red LED 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an LED display device, and more particularly to a pseudo full color display device that displays a pseudo full color using two-color light emitting diodes and a road sign that displays information using the pseudo full color display device.

  A light-emitting diode (hereinafter referred to as “LED”) is a semiconductor element having high color purity due to its narrow spectral half-width, and is a light-emitting element that emits light with a small size, high efficiency, and vivid colors. In recent years, blue LEDs have been put into practical use, and as a result, LEDs of three primary colors of red, green, and blue are prepared, and full-color display can be performed using these LEDs.

  In addition, the LED has low power consumption, does not generate heat, and has a long life. Therefore, the LED is used in various display portions, and is suitably applied to road signs, guide signs inside buildings, and the like. These display devices generally display in a single color and display in a single color such as green or red.

  If the above simple symbol or character display is used, a single color display may be used. However, when performing video display, a color display using a plurality of LEDs is preferable. However, it is not preferable to perform multi-tone full-color display using LEDs of three primary colors of red, green, and blue because the cost increases. For this purpose, a two-color LED display device is provided which displays a desired image or the like by arranging two-color LEDs of red and green in a dot matrix form. This display device performs pseudo-color display by controlling gradation of each two-color LED as a pixel unit, and is less expensive than a full-color display device that controls gradation of three primary colors of red, green, and blue. In addition, there is an effect that the circuit configuration can be simplified.

  However, since the conventional two-color LED uses the red and green LED chips as described above, the light emission color is an approximate orange color of red, green, and its intermediate color, and is generally an orange approximation. Becomes a monotonous color. In particular, in a two-color LED display device using such a two-color LED, the expression color is generally an orange-like color. Therefore, the person who sees the display of the two-color LED display device feels that the pseudo color is greatly different from the actual color. As a result, the conventional two-color LED display device has poor color reproducibility of the image to be displayed, and has a low expressive power due to the pseudo color.

Therefore, a two-color light emitting diode display that is superior in color reproducibility by using the color of a two-color LED having two color LED chips as a color in which a straight line connecting the wavelengths of those colors passes through a white region in a chromaticity diagram. A device has already been filed (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 10-11002 (page 1-5, FIG. 6)

  However, even if two-color LEDs having two-color LED chips are not used, two different colors of LEDs are arranged in a predetermined matrix so that the display color is slightly smaller than the conventional full color. Although there is a limitation, we have eagerly studied whether it is possible to simulate the conventional full-color LED display, and it is possible to display an image display similar to full-color only by using two colors of LEDs of a predetermined color. I found out.

  An object of the present invention is to provide a pseudo full-color display device and a road sign that can display an image similar to a full color only by using two types of LEDs without using three primary color LEDs.

  In order to achieve the above object, an invention according to claim 1 is provided to cover a light emitting display panel in which two types of LEDs, a red LED and a blue green LED, are arranged in a matrix, and to cover an upper surface of the light emitting display panel. Image display controller for controlling the light emission intensity of a predetermined LED via a translucent panel, a data selection control unit for setting an image to be displayed on the light emission display panel, and a light control unit for setting the light emission intensity of each LED And a pseudo full-color display device in which the light emission gradation of each pixel unit of the blue-green LED is twice the light emission gradation of the red LED.

  According to the invention according to claim 1 having the above-described configuration, even in a display device in which two types of LEDs, a red LED and a blue-green LED, are arranged, the emission gradation of the blue-green LED is finely controlled. This is a pseudo-color display that can be displayed similar to a full color, and can display a predetermined image and display information such as road signs and premises signs by using only two color LEDs without using three color LEDs. A full-color display device can be formed.

  The invention according to claim 2 is characterized in that the red LED can be converted into 16 gradations and the blue-green LED can be converted into 32 gradations.

  According to the invention according to claim 2 having the above-described configuration, the light emission gradation of each LED constituting the pixel is converted into 16 gradations and 32 gradations at most, so that a road sign or A pseudo full-color display device capable of displaying guidance can be formed.

  The invention according to claim 3 is characterized in that the image display controller includes a memory control unit which serves as a storage unit as well as an external data input unit.

  According to the third aspect of the invention having the above-described configuration, it is possible to capture a desired image to be displayed and perform pseudo full color display.

  According to a fourth aspect of the present invention, when the vertical display screen is configured by arranging the red LEDs and the blue-green LEDs in a matrix, the LEDs are arranged in an oblique direction so as not to overlap each other in the horizontal direction. One pixel is formed from a pair of two-color LEDs arranged in this manner, and the pixels are arranged in a matrix to form a vertical display screen.

  According to the invention according to claim 4 having the above-described configuration, even when viewed from the front, obliquely from the right, or obliquely from the left, the light emitting elements do not overlap with each other, so that the hue does not change. A full color display screen can be constructed.

  The invention according to claim 5 is characterized in that it is a road sign for guidance display using the pseudo full-color display device according to any one of claims 1 to 4.

  According to the invention which concerns on Claim 5 which has said structure, the road sign which can carry out various guidance displays using a moving image can be obtained.

  As described above, according to the present invention, a light emitting display panel in which two types of LEDs, a red LED and a blue green LED, are arranged in a matrix, and an image display controller for controlling the light emission gradation of each LED are provided. At the same time, the pseudo-full-color display device in which the emission gradation of each pixel unit of the blue-green LED is twice the emission gradation of the red LED, so that the full-color is controlled by finely controlling the emission gradation of the blue-green LED. Thus, a pseudo full-color display device can be obtained which can display information similar to the above, and can perform guidance display using a predetermined image only by using two-color LEDs. Moreover, a road sign that enables guidance display using a moving image can be obtained only by using two-color LEDs.

  Hereinafter, embodiments of a pseudo full-color display device and a road sign according to the present invention will be described in detail with reference to the drawings.

  A pseudo full color display device 1 shown in FIG. 1 covers a light emitting display panel 2 in which two kinds of LEDs, a red LED and a blue green LED, which will be described later, are arranged in a matrix, and an upper surface of the light emitting display panel. A translucent panel 7 is provided.

  As shown in the cross-sectional view of FIG. 1B, the translucent panel 7 also serves as a protective panel that covers the upper surface of the light-emitting display panel 2 laid in the recess of the display main body 1A, and is transparent and rigid. In this embodiment, a polycarbonate plate that is a hard transparent resin is preferably used.

  In addition, the light emitting display panel 2 includes a control unit 3 (3A, 3B,...), Each of which is a unitized light emitting display panel 2A, 2B, 2C, 2D,. It is configured as a display device. For this purpose, the light-emitting display panel 2A includes a control unit 3A, and the light-emitting display panel 2B includes a control unit 3B. For example, as illustrated in FIG. 1A, the light-emitting display panel 2A includes eight light-emitting display panels 2A to 2H. If it is a display device, it is a single display device up to the light emitting display panel 2H provided with the control unit 3H.

  Further, the pseudo full-color display device 1 is equipped with an image display controller 4 including a memory control unit which is an external data input unit and also serves as a storage unit, an external signal control interface, and a dimming control interface.

  A data cassette 5 storing display data can be attached to the memory control unit, and any desired image can be displayed. The external signal control interface selects an image to be displayed through a data selection control unit, and the dimming control interface sets a predetermined LED corresponding to the image information selected through the dimming control unit to a predetermined brightness. It is a device that performs control to emit light. Reference numeral 6 denotes a power supply unit for supplying desired power.

  In FIG. 2A, as an example using the pseudo full-color display device 1 according to the present invention, a road sign having a vertical display screen using two kinds of LEDs, a red LED 11 and a blue green LED 12, is used. 10 is shown. The road sign 10 includes, for example, a light-emitting display panel 2 composed of six panels, an illumination device 13 for performing an alarm, an internal display 14 for displaying predetermined information, and a power supply device 15 such as a battery. It is set as the structure provided. Each of the light emitting display panels has a two-color LED of a red LED 11 and a blue green LED 12 arranged in a matrix as shown in FIG. Further, a caster 16 is attached to the gantry body, and the road sign 10 is configured to be movable.

  Further, as shown in FIG. 2 (c), one pixel that exhibits a predetermined color is placed close to the red LED 11 and the blue green LED 12 in an oblique direction so that the LEDs do not overlap in the horizontal direction. Are formed from a pair of two-color LEDs.

  Therefore, even when viewed from the front, from the right oblique direction, or from the left oblique direction, the light emitting elements do not overlap and are not shaded, so that a display screen in which the hue does not change can be configured. .

  Further, even when the pixels are arranged at a pitch of 10 mm or 20 mm, the light emission gradation of each pixel unit of the blue green LED 12 is set to be twice the light emission gradation of the red LED 11. Thus, for example, the red LED 11 can be converted into 16 gradations, and the blue green LED 12 can be converted into 32 gradations, so that a display similar to a full color can be achieved, and an image is used for the road. A pseudo full-color display device capable of displaying signs and guidance can be formed.

  As described above, the pixel included in the pseudo full-color display device 1 according to the present invention includes a pair of two-color LEDs that are disposed in the diagonal direction so that the red LED 11 and the blue-green LED 12 do not overlap in the horizontal direction. It is a pixel consisting of For this reason, it is possible to display a hue obtained by mixing red and blue-green colors at a predetermined blending ratio for each pixel unit, and display similar to a full color can be achieved without using a blue LED. Of course, although it is inferior to the full-color screen displayed using the three primary color LEDs, the pseudo full-color display device according to the present invention is conventionally used for guidance displays such as road signs that have been mainly displayed in a single color and premises signs inside buildings. By using 1, it is possible to realize color image information that could not be displayed conventionally at a low equipment cost.

  The matrix configuration of the LED unit is shown in FIG. Circles surrounded by broken lines in the figure indicate pixel units (pixels 41, 42, 43, and 44). The red LEDs 11 </ b> A that form these pixels are connected by vertical lines 21 and horizontal lines 24, and the red LEDs 11 </ b> B are connected by vertical lines 23 and horizontal lines 24. The blue green LED 12A is connected by a vertical line 20 and a horizontal line 24 (via a line 24A), and the blue green LED 12C is connected by a vertical line 20 and a horizontal line 25 (via a line 25A). Yes.

  That is, the pixel 41 controls the blue-green light emission intensity with the vertical line 20 and the horizontal line 24, and controls the red light emission intensity with the vertical line 21 and the horizontal line 24 to reveal a predetermined hue. Can do. Further, the pixel 42 controls the blue-green light emission intensity with the vertical line 22 and the horizontal line 24, and controls the red light emission intensity with the vertical line 23 and the horizontal line 24, so that a predetermined color tone appears. The pixel 43 controls the blue-green light emission intensity with the vertical line 20 and the horizontal line 25, and controls the red light emission intensity with the vertical line 21 and the horizontal line 25, thereby displaying a predetermined color shade. Further, the pixel 44 controls the blue-green light emission intensity with the vertical line 22 and the horizontal line 25, and controls the red light emission intensity with the vertical line 23 and the horizontal line 25 to reveal a predetermined color shade.

  As described above, each pixel can be controlled so as to develop an arbitrary hue within a certain range, and a pseudo full color display approximate to predetermined image information can be performed.

  Next, the system of the pseudo full color display device 1 according to the present invention will be described with reference to the system block diagram shown in FIG. The pseudo full-color display device 1 is equipped with an image display controller 4 including a memory control unit 41, an external signal control interface 42, and a dimming control interface 43, and each light emitting display panel is connected via the image display controller 4. 2A, 2B, 2C, 2D...

  Power to each light emitting display panel 2 and image display controller 4 is supplied from a power supply unit 6. The memory control unit 41 can be loaded with a data cassette 5 that stores display data, and can display any desired image. The external signal control interface 42 selects an image to be displayed via a data selection control unit 31 provided separately. Further, the dimming control interface 43 performs control to emit a predetermined LED corresponding to the image information selected via the dimming control unit 32 provided separately to a predetermined brightness. The data selection control unit 31 is a device for setting an image to be displayed on the light emitting display panel 2 (2A, 2B...), And the dimming control unit 32 is a device for setting the light emission intensity of each LED. .

  The data cassette 5 can freely write arbitrary image data via the data writer device 33, and can also write image data stored in an information storage means 34 such as a personal computer.

  If the data selection control unit 31 is provided with an infrared remote control receiver, it is preferable because the remote control transmitter 35 allows remote control operation from the outside, and wireless data setting can be performed. Further, it is also possible to provide a light control sensor 36 for detecting the light emission intensity of the light emitting display panel, and to perform feedback control of the light control unit 32 to maintain the set light emission intensity.

  An operation procedure for rewriting data to be displayed will be described with reference to a pseudo full color system data rewrite flow shown in FIG.

  In preparation for data writing, image data is imported with data editing software, and characters are edited. Next, gradation conversion processing for each pixel unit (for example, the red LED has 16 gradations and the blue-green LED has 32 gradations) is performed to set the movement of characters and image data. That is, a moving image desired to be displayed can be set.

  In addition, when image data is captured, an image corresponding to the screen configuration can be created by separately preparing image data, and the created image can be captured as file data in the data editing software.

  Any of the above operations can be performed using the information storage means 34 such as a personal computer. The image information set in this way is written in the data cassette to be mounted on the data writer, the data cassette is set in the image display controller 4, the power is turned on, the display number is set in the data selection control unit, This is a procedure for displaying an image.

  The red LED 11 and the blue-green LED 12 used in the present embodiment had the emission wavelength peaks of the red LED 11 of 630 nm and the blue-green LED 12 of 505 nm, respectively. By arranging these two color LEDs in a matrix and setting the light emission gradation of the blue-green LED 12 to twice the light emission gradation of the red LED 11, pseudo full-color image data similar to full color can be displayed. Is possible.

  As described above, each pixel of the red LED and the blue green LED is formed from a pair of two-color LEDs arranged in the oblique direction so as not to overlap in the horizontal direction, and this pixel is formed in a matrix shape. Are arranged in a vertical display screen, and the light emission gradation of the blue-green LED 12 is set to be twice the light emission gradation of the red LED 11, so that it can be seen from the front or from the right diagonal direction. From the above, it is possible to construct a pseudo full color display screen in which the light emitting elements do not overlap and the hue does not change. Therefore, it is possible to configure a pseudo full-color display device that can be suitably applied to guide displays such as road signs and premises signs inside buildings by using only two-color LEDs.

  Furthermore, the light emission gradation of each LED constituting the pixel is changed to 16 gradations and 32 gradations at the maximum by changing the red LED to 16 gradations and the blue green LED to 32 gradations. Can be used to form a pseudo full-color display device capable of displaying guidance such as road signs and premises signs, and can display pseudo full-color moving images at low cost.

  As described above, since the pseudo full-color display device according to the present invention performs pseudo full-color display using two-color LEDs without using three-color LEDs, the number of LED lamps can be reduced. Furthermore, since it is possible to perform pseudo full-color display only by controlling the conversion to 16 gradations and 32 gradations at most, the cost can be further reduced.

1 shows an example of a pseudo full-color display device according to the present invention, where (a) is a front view and (b) is a cross-sectional view. The road sign to which the pseudo full color display device concerning the present invention is applied is shown, (a) is a whole front view, (b) is an enlarged view of a light emission display panel, (c) is an arrangement state of each LED FIG. It is a schematic explanatory drawing which shows the connection state of LED. A pseudo full color system block diagram is shown. A pseudo full color system data rewrite flow is shown.

Explanation of symbols

1 Pseudo full color display device
2 Luminescent display panel
3 Control unit
4 Image display controller
5 Data cassette 10 Road sign 11 Red LED
12 Blue Green LED

Claims (5)

  A light-emitting display panel in which two types of LEDs, a red LED and a blue-green LED, are arranged in a matrix, a translucent panel provided so as to cover the upper surface of the light-emitting display panel, and an image to be displayed on the light-emitting display panel are set An image display controller for controlling the light emission intensity of a predetermined LED via a data selection control unit for controlling the light emission intensity of each LED and a light control unit for setting the light emission intensity of each LED. A pseudo full-color display device characterized in that the tone is set to twice the light emission gradation of the red LED.   2. The pseudo full color display device according to claim 1, wherein the red LED can be converted to 16 gradations, and the blue-green LED can be converted to 32 gradations.   The pseudo full-color display device according to claim 1, wherein the image display controller includes a memory control unit that serves as a storage unit as well as an external data input unit.   When the red LED and the blue green LED are arranged in a matrix to form a vertical display screen, a pair of two colors are arranged adjacent to each other in an oblique direction so as not to overlap in the horizontal direction. 4. The pseudo full-color display device according to claim 1, wherein one pixel is formed from an LED, and the pixel is arranged in a matrix to form a vertical display screen.   A road sign characterized by displaying guidance using the pseudo full-color display device according to any one of claims 1 to 4.

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