JP2009025580A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device for displaying a multi-level character, graphic, still picture or the like, as a single-level one so as to be clearly viewed even from a short distance. <P>SOLUTION: The display device includes: a display part 59 comprising a plurality of arrayed light emitting elements; a display control part 54 for performing a gradation display; a memory part 51 for storing display data and a threshold; and a display data switching part 65. The multi-level display data is switched to the single-level display data based on the threshold corresponding to the type of the display data. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a display device that arranges light emitters such as LEDs in a matrix and displays characters, figures, still images, and the like in multiple gradations or single gradations.

  In conventional display devices, light-emitting elements such as LEDs (light-emitting diodes) are arranged in a matrix, and light-emitting elements are selectively driven to emit light to display arbitrary characters, figures, still images, etc. In some cases, however, the light emission time of the light emitting element is controlled, and the light emission luminance can be displayed with different shades (for example, see Patent Document 1). FIG. 5 is a block diagram showing a schematic configuration of a conventional display device described in Patent Document 1. In FIG.

  In FIG. 5, a display device 100 includes a plurality of LED elements 8 and an LED driver 7 that controls turning on and off of the LED elements 8, and a display unit 30 that displays display data such as characters, figures, and still images. EPROM, EEPROM, flash ROM for inputting display data D1 such as characters, figures, still images, etc. created by a personal computer (not shown) through the storage medium 6 and storing display data and control data A memory unit 10 having a ROM 1 such as an SRAM, an SRAM 2 for expanding display data and control data, a RAM 3 such as a VRAM, and a CPU 3 for delivering data to the memory unit 10 and performing display control based on the data. And lighting of the LED element 8 in the display unit 30 according to display data stored in the memory unit 10 in advance. Convey the number C1, a field programmable gate array (hereinafter, FPGA hereinafter) and a display control unit 20 having a 4.

The display data header is provided with flags representing multi-gradation display data and single-gradation display data. The display control unit 20 performs display control with emphasis on expressiveness for multi-gradation display data and importance on visibility for single-gradation display data by the flag.
JP 2004-233477 A

  However, in the conventional configuration, when displaying characters, graphics, and still images in multiple gradations, it is difficult to recognize the halftone part unless the distance from the display unit is a certain distance or more, and the display is not clear. Therefore, in addition to the multi-gradation display data, it is necessary to separately store single gradation data that can be clearly seen even at a short distance.

  The present invention solves the above-described conventional problems, and an object thereof is to provide a display device and a screen display method capable of displaying multi-gradation characters, figures, and still images in a single gradation that can be clearly seen even at a short distance. Yes.

  In order to solve the above-described conventional problems, the display device of the present invention is composed of a plurality of light emitting elements, and is a display device that displays display data such as characters, graphics, and still images. The display device has a threshold value corresponding to the type of display data.

  According to this configuration, when processing multi-gradation display data into a single gradation, it is possible to select an optimum threshold value corresponding to the type of character, figure, still image, or the like. As a result, it is possible to prevent lines such as characters and figures from becoming thin and display content from being difficult to see, and to prevent a still image or the like from being almost lit or completely turned off, thereby providing an easy-to-view display.

  Further, the screen display method of the display device of the present invention is a display device comprising a display control step of separating multi-tone display or single-tone display based on a value detected by a remote control light receiving unit. .

  According to this configuration, multi-gradation display data can be converted into single-gradation display data based on the value detected by the remote control light receiving unit, and the display contents can be clearly displayed.

  According to the display device and the screen display method of the present invention, when converting multi-gradation display data to single-gradation display data, an optimum threshold value is selected according to the type of character, figure, still image, or the like. Therefore, it is possible to convert data such as characters and figures into single-tone data without destroying the image, and realize a display device that can convert multi-tone data such as still images into a single-tone image whose contents can be recognized. it can.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing a schematic configuration of a display device according to Embodiment 1 of the present invention. In FIG. 1, the display device 200 displays display data such as characters, figures, and still images, and a display unit 59 including a plurality of LED elements 60 and an LED driver 61 that controls lighting of the LED elements 60, Display data D1 such as characters, figures and still images created by a personal computer (not shown) is input via the storage medium 63 and stored in the ROM 52 such as EPROM, EEPROM, flash ROM, etc. , A memory unit 51 having a RAM 53 such as an SRAM or SDRAM for expanding display data and control data, a CPU 55 for performing data processing with the memory unit 51, a type of data to be displayed, a character, a figure, Display data switching unit for converting to single gradation data according to the threshold value set for each still image etc. 5, for sending the converted display data in the display data switching unit 65 on the display unit 59, and a display control unit 54 comprises a FPGA 58.

  FIG. 3 shows an example in which the multi-grayscale display data is composed of 4 bits at the threshold when the multi-grayscale display data is converted into single-grayscale display data in the display data switching unit 65. Show. The multi-gradation display data is composed of information of each LED having a value corresponding to 16 levels of brightness of 0x00 to 0x0F. In the case of display data such as characters and figures, if the threshold value is set to a large value, the LED having the intermediate gradation luminance is turned off, and the character line becomes thin and the appearance is deteriorated. For this reason, the threshold value is set to the lowest value 0x01, and an LED having a brightness equal to or higher than the threshold value is also turned on in a single gradation display so that characters and graphics lines do not become thin. In the case of still image data, the display data converted into single gradation display data uses 16 gradations, which is the number of gradations that can be displayed, as much as possible in order to fully express the multi-gradation expression power. , Convert it for easy viewing. For this reason, an approximately intermediate value 0x08 set as multi-gradation display data is used as a threshold value, a threshold value of 0x08 or more is turned on, and a threshold value less than 0x08 is turned off. Therefore, it is possible to display in a single gradation while suppressing the shape of multi-gradation display data from being destroyed.

  If the threshold value is determined from the same concept even in a display device having display gradations other than 16 gradations, in the case of 32 gradations, 1 dot is 5 bits of data, and the display data of characters and figures is displayed. The threshold value is 0x01, and the threshold value of display data such as a still image is 0x10. In the case of 64 gradations, 1 dot is 6-bit data, the threshold value of character data is 0x01, and the threshold value of image data is 0x20.

  The same applies when the display data is other than 16 gradations or 64 gradations.

  FIG. 4 shows a display example after single gradation conversion by the display control unit 54 of the display device.

  According to the display device of the present embodiment, the type of data to be displayed is determined based on the value detected by the remote control light receiving unit 64, and the display data switching unit 65 sets each of characters, figures, still images, and the like. It can be converted into multi-tone data or single-tone data according to the threshold value and displayed on the display device.

  The display data switching unit 65 may be built in the FPGA 58.

(Embodiment 2)
FIG. 2 is a flowchart showing conversion processing of multi-gradation display data into single-gradation display data by the display control unit 54 of the display device.

  FIG. 2A is a flowchart of processing for determining a remote controller input value and holding the value. The display data switching unit 65 holds the remote control input value detected by the remote control light receiving unit 64. At this time, if the detected remote control input value is a value corresponding to a multi-gradation display instruction or a value corresponding to a single gradation display instruction, this value is retained, and if it is any other value, the previous value Continue holding. FIG. 2B is a flowchart showing the conversion process when updating the display data. When updating the display data, the remote control input hold value determined in FIG. 2A is determined (step S30). If the determined result is a multi-gradation display instruction, the multi-gradation display data is written in the FPGA 58 (step S34). On the other hand, if the determined result is a single gradation display instruction, the display data is determined next (step S31). The display data has a determined value corresponding to each of character / figure / still image data as data type information in the header portion. If the header of the display data is determined and the determined result is a character or graphic, the multi-gradation display data is converted into single gradation display data based on the threshold condition character / graphic of FIG. Write to the FPGA 58 (step S32). On the other hand, if the determined result is a still image, the multi-gradation display data is converted into single-gradation display data based on the still image with the threshold condition shown in FIG. 3 and written to the FPGA 58 (step S33). When the display data is written in the FPGA 58 in steps S32, S33, and S34, this flow ends.

  The detected remote control input value is held only until one display data update, and if there is no remote control input before the display data is updated, a multi-tone display method is used. Only one display data after remote control operation may be displayed in single gradation.

  The LED display device of the present invention has a threshold corresponding to display data such as multi-gradation characters, figures, still images, etc., so that it can be displayed in a single gradation that is clearly visible even at a short distance. Because it is not necessary to store multiple grayscale display data and single grayscale display data in the memory unit that saves display data, a lot of multitone display data can be saved for more effective display. Useful as it can.

1 is a block diagram showing a schematic configuration of a display device according to a first embodiment of the present invention. Flowchart showing conversion processing according to the second embodiment of the present invention. The figure which shows the example of the threshold value of the single gradation conversion concerning Embodiment 1 of this invention The figure which shows the example of a display after single gradation conversion concerning Embodiment 1 of this invention The block diagram which shows schematic structure of the conventional display apparatus

Explanation of symbols

1, 52 ROM
2, 53 RAM
3, 55 CPU
4, 58 FPGA
6, 63 Storage medium 7, 61 LED driver 8, 60 LED element 10, 51 Memory unit 20, 54 Display control unit 30, 59 Display unit 64 Remote control light receiving unit 65 Display data switching unit 100, 200 Display device

Claims (3)

A display unit that includes a plurality of light emitting elements and displays characters, graphics, still images, and the like, a display control unit that controls gradation display of display data displayed on the display unit, and multi-gradation display or single floor display A display device comprising: a memory unit that stores a threshold value for separating a tone display; and a display data switching unit that converts the data into single gradation data according to the threshold value corresponding to the type of display data having multiple gradations. The display device according to claim 1, wherein the display unit includes a plurality of LEDs (light emitting diodes) arranged in a matrix. A display unit that includes a plurality of light emitting elements and displays characters, graphics, still images, and the like, a display control unit that controls gradation display of display data displayed on the display unit, and multi-gradation display or single floor display A memory unit for storing a threshold value for separating the tone display, a display data switching unit for converting into single gradation data by the threshold value according to the type of the display data of multi-gradation, and a remote control light receiving unit A screen display method for a display device, comprising: a display control step for separating multi-tone display or single-tone display based on a value detected by the remote control light receiving unit.