JP2003084713A - Led display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED display device which can simplify the work to regulate the display signals to be sent out to an LED display section. SOLUTION: This LED display device consists of an LED panel display 15 on which a plurality of light emitting blocks consisting of >=1 color of LEDs are arranged in a matrix form, a display signal transmitter 10 which supplies the display signals to the LED panel display 15, a receiver 11 which receives the signals from the transmitter 10, a controller 12 which transmits display information to the LED panel display 15 and a personal computer 8 which has means of performing the control of the receiver 11 and the controller 12, various kinds of setting and management of set values, in which the personal computer 8 has a means of performing DC level setting, gain setting and PLL setting in accordance with the display signals inputted to the transmitter 10 and a means for initializing these settings.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LED display device used for an outdoor or indoor panel display or the like.

[0002]

2. Description of the Related Art In recent years, in the field of information display for indoor and outdoor facilities, full color LED display using red (R), green (G) and blue (B) light emitting diodes (hereinafter referred to as "LED"). Devices are rapidly becoming popular. In such an LED display device, a television, a VCR, a laser disk (registered trademark) has been conventionally used as a video source.
Video signals from players, video cameras, etc. are often used.

As a video signal system, there are PAL, SECAM, HDTV, DV, personal computer R, G, B signals, etc. in addition to the NTSC system. In the following description, for convenience, NT
An apparatus for displaying an SC system video signal will be described, but the same applies to other system video signals.

FIG. 5 is a schematic diagram showing an example of the configuration of a conventional LED display device.

As shown in FIG. 5, the LED display device is roughly divided into a sending section 17 and a display section 18.

The sending section 17 is provided with a TV tuner 1, a laser disc player 2, a video deck 3, an AV device such as a video camera 4, an AV selector 5, an amplifier 6, a scan converter 9, an RGB transmitter 41, and a monitor 7, respectively. It is a thing.

On the other hand, the display unit 18 is provided with an RGB receiver 42, a controller 12, an LED panel display 15, a power source 14, a speaker 13, and a housing 16.

AV equipment such as the television tuner 1, the laser disk player 2, the video deck 3, and the video camera 4 of the sending section 17 is connected as an input of the AV selector 5. The AV selector 5 selects an input signal of these AV devices. The output of the AV selector 5 is input to the scan converter 9. The scan converter 9 separates an NTSC video signal into a color signal C and a luminance signal Y, and performs color adjustment of hue, lightness, and saturation. The color signal C is then separated into color difference signals RY (U) and BY (V). These signals are analog-to-digital converted and then scaled to the effective display area, and digital R, G, B
Converted to a signal and finally converted to analog and analog RG
It is output as a B signal.

The RGB transmitter 41 amplifies signals necessary for transmitting the analog RGB signal to the RGB receiver 42. The signal transmitted to the RGB receiver 42 is R
(Red), G (green), B (blue), H (horizontal synchronizing signal) and V (vertical synchronizing signal) in total. RGB transmitter 4
The distance between 1 and the RGB receiver 42 is usually about 50 to 200 m.

FIG. 6 shows an example of functional blocks of the RGB receiver 42. The input signal to the RGB receiver 42 is RGB
5 color signals, H (horizontal synchronizing signal) and V (vertical synchronizing signal). The RGB receiver 42 includes a DC reproduction circuit 19, an analog amplifier circuit 20, an A / D conversion circuit 21, and a PLL circuit 22.

The DC reproducing circuit 19 is a circuit for adjusting the black voltage level (ground level) of the RGB color signals to a constant value.

The PLL circuit 22 shown in FIG. 6 has a horizontal synchronizing signal H.
Generate a dot clock from.

The analog amplifier circuit 20 has a function of adjusting the gain to the signal amplitude and adjusting the gain level required when the RGB color signals are input to the A / D conversion circuit 21. A
The RGB color signals input to the / D conversion circuit 21 are converted to digital at the falling edge of the dot clock and output to the controller 12.

FIG. 7 shows an example of functional blocks of the controller 12. The controller 12 uses the gamma conversion table 3
7, a multiplier 36, a RAM 128, a control circuit 35, and a display division circuit 39. RGB receiver 4
The output from 2 is input to the controller 12, and the controller 12 temporarily stores it in the RAM 128. Control circuit 3
Reference numeral 5 performs writing and reading timing generation of the RAM 128, timing generation at the time of gamma conversion, and timing generation of the display division circuit 39. The data stored in the RAM 128 is multiplied by the coefficient of the gamma conversion table 37 and subjected to inverse gamma conversion, and the voltage-luminance characteristic of the CRT and LE.
Correct the difference between D's current vs. brightness characteristics. afterwards,
The display division circuit 39 divides the display into units of the LED panel display 15 and converts the signal into a format in which the LED panel display 15 can read the signal.

Although the display section 18 is shown in a simplified manner for the sake of clarity in FIG. 5, in reality, a large number of LED panel displays 15 are arranged vertically and horizontally, and all of them are output signals of the controller 12. Switch the display / non-display of the LED. Each light emitting block of the LED panel display 15 is composed of R, G, and B LEDs which are the three primary colors. In this way, the LED panel display 15
The image display can be obtained by ON / OFF controlling the R, G, and B LEDs forming each pixel according to the signal input from the controller 12.

The display device constructed as described above involves adjustment work at the final stage. This adjustment is conventionally performed while inputting a reference video signal and observing the waveform with an oscilloscope. The adjustment item is a PL that generates a dot clock from the horizontal synchronization signal H.
These are L setting, DC level adjustment and gain adjustment of the A / D converter.

[0017]

However, in the display device having the conventional configuration shown in FIG. 5, the input waveform of the A / D converter for converting the analog RGB signal into the digital signal is observed while observing the waveform of the oscilloscope. Since it is necessary to adjust the volume, the work is complicated. Furthermore, the final fine adjustment needs to be done while checking the image, so one person checks the image, the other person adjusts the volume with the oscilloscope and driver, and both parties use the transceiver to communicate with each other. This is a complicated adjustment work.
Moreover, if the receiver is damaged for some reason, it is necessary to perform the adjustment work again from the beginning.

When the operation actually starts and there is a failure in the LED, the contents and quantity are clarified only by the regular maintenance unless the contents are very bad, and the display quality and the period before the regular maintenance are grasped. Not not.

An object of the present invention is to provide an LED display device capable of simplifying the work of adjusting a display signal to be sent to the LED display portion, and at the same time, the place and quantity of the failure can be grasped in advance at the time of regular maintenance, and the failure can be performed. It is an object of the present invention to provide an LED display device capable of exchanging LEDs regardless of regular maintenance when the frequency exceeds a certain value.

[0020]

An LED display device according to the present invention includes an LED display section in which a plurality of light emitting blocks each including one or more LEDs are arranged in a matrix, and the LED
Display signal sending means for supplying a display signal for displaying on a display unit, display signal receiving means for receiving a signal from the display signal sending means, a controller for sending display information to the light emitting block, and the display signal It comprises a personal computer having a receiving means and a controller for controlling the controller, and a means for managing various settings and set values. The personal computer performs DC level setting, gain setting and PLL setting based on a display signal input to the display signal transmitting means. It is provided with a means for performing and a means for initializing these settings.

According to the present invention, it is possible to obtain the LED display device capable of simplifying the work of adjusting the display signal sent to the LED display section.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is an LED display section in which a plurality of light-emitting blocks composed of LEDs of one or more colors are arranged in a matrix, and a display signal for displaying on the LED display section. Display signal sending means for supplying
Display signal receiving means for receiving a signal from the display signal transmitting means, a controller for transmitting display information to the light emitting block, means for controlling the display signal receiving means and the controller, and managing various settings and set values. And a personal computer having a personal computer, which is an LED display device having means for performing DC level setting, gain setting and PLL setting based on a display signal input to the display signal transmitting means, and means for initializing these settings. Yes, the personal computer D of the analog display signal input to the A / D converter in the display signal transmitting means according to a preset procedure.
It has an effect of performing various settings of the C level, gain and PLL, and initializing (resetting) those settings.

The invention according to claim 2 is the LED display device according to claim 1, wherein the personal computer has means for initializing various settings of the display signal receiving means, and a reset signal from the personal computer side is used. It has an effect that the display signal receiving means is initialized.

According to a third aspect of the present invention, the personal computer causes the controller to set display start coordinates, gamma coefficient,
Gamma table selection, dimming value setting, noise reduction value setting,
The LED display device according to claim 1 or 2, further comprising means for performing LED failure detection setting and light emission block adjustment value setting, and means for initializing these settings, wherein the controller is from the personal computer. The function of performing display start coordinates, gamma coefficient setting, gamma table selection, dimming value setting, noise reduction value setting, LED failure detection setting, light emitting block adjustment value setting, and initialization (reset) of these based on the command. Have.

According to a fourth aspect of the present invention, there is provided means for storing each set value of the display signal sending means and the controller in an individual storage area, and for automatically restoring these set values when the power is turned on. The LED display device according to any one of 3 above, wherein each set value of the display signal sending means and the controller stored in a separate storage area is automatically restored when the power is turned on. Have.

The invention according to claim 5 is the LED display device according to claim 3, wherein the result of the detection of the failure of the LED is transmitted from the controller to the personal computer, and the personal computer has means for storing the result. The result is that the LED failure detection result is stored on the personal computer side, and the result can be easily used.

According to a sixth aspect of the present invention, there is provided the LED display device according to the third aspect, which has a means for storing the result of the LED failure detection inside the controller.
It has an effect that the result of LED failure detection can be collected inside the controller.

According to a seventh aspect of the present invention, the personal computer is externally provided with a DC level setting value, a gain setting value, a PLL setting value of the display signal transmitting means, a display start coordinate value of the controller, a gamma table selection value, and a light control. The LED display device according to claim 1, further comprising means for referring to the set value, the noise reduction value, the failure detection result and the light emission block adjustment value, and the operation of being able to monitor these values and the failure detection result from a personal computer. Have.

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in FIGS. 1, 2, 3 and 4.

FIG. 1 shows the overall configuration of the transmission section and the display section, FIG. 2 shows the block configuration of the transmitter, FIG. 3 shows the configuration of the receiver, and FIG. 4 shows the configuration of the controller.

In FIG. 1, the configuration of this embodiment differs from the conventional configuration shown in FIG. 5 in that the RGB transmitter 4 of FIG.
1 and RGB receiver 42 are changed to transmitter 10 and receiver 11 in FIG. 1, and in FIG. 5, signals between RGB transmitter 41 and RGB receiver 42 are analog VG.
1A, the connection between the transmitter 10 and the receiver 11 in FIG. 1 is an optical fiber 43. Conventionally, the RGB receiver 42 performs analog-to-digital conversion, whereas in the present embodiment, the transmitter 10 performs A / D conversion to convert into an optical signal, and the control signal of the personal computer 8 is transmitted to the transmitter 10. It is connected. Other configurations are the same as those shown in FIG. 5, and the same reference numerals are given to omit the description.

In this embodiment, the case where the output from the scan converter 9 is the VGA signal will be described below. The idea is the same when this signal is an XGA or other signal.

An example of functional blocks of the transmitter 10 is shown in FIG. The input signals to the transmitter 10 are five color signals of analog RGB, H (horizontal synchronizing signal) and V (vertical synchronizing signal). The transmitter 10 includes a DC reproduction circuit 19, an analog amplifier circuit 20, a PLL circuit 22, an A / D conversion circuit 21, an OS.
The C circuit 26, the timing control circuit 27, the RAM 28, the command control circuit 23, the EEPROM 24, the reset circuit 25, the multiplexing circuit 29, and the E / O conversion circuit 30.

The output signal from the scan converter 9 is
The DC voltage reproduction circuit 19 adjusts the black voltage levels (ground levels) of the RGB color signals to constant values. This is to absorb the difference in the specifications of the output signal of the scan converter 9 depending on the manufacturer and to eliminate the subtle level difference between the RGB signals. Therefore, when highly accurate conversion is required, adjustment of the DC level and gain of these signals becomes indispensable.

The PLL circuit 22 generates a dot clock from the horizontal synchronizing signal H and simultaneously adjusts the phase. Since the dot clock serves as a reference for the conversion timing of the A / D conversion circuit 21, it is necessary to adjust the phase.

The analog amplifier circuit 20 has a function of adjusting the gain to a signal amplitude necessary for inputting RGB color signals to the A / D conversion circuit 21 and adjusting the gain level. A
The RGB color signals input to the / D conversion circuit 21 are converted to digital at the falling edge of the dot clock. OSC
The circuit 26 is a circuit for generating a clock having a reference transmission frequency for optical transmission. In this embodiment, RGB signals,
Since 40 of the total of H, V and command signals are multiplexed, 25 MHz × 40 = 1000 MHz = 1 GHz,
Transmit at 1.2 GHz with a margin.

The timing control circuit 27 performs timing control when storing and reading the A / D converted RGB digital signal in the RAM 28, and at the same time, the multiplexing circuit 2
9 controls the data transfer. The inside of the RAM 28 is composed of two sets, one for odd frames and one for even frames.
The timing control circuit transmits the data of the even number frame to the multiplexing circuit while writing the data in the odd number frame, so that the writing frequency (2
5MHz) and optical transmission reading frequency (1.2GHz)
Absorb the frequency difference of.

The command control circuit 23 analyzes the command sent from the personal computer 8. First, the commands are classified into commands related to the transmitter 10 and unrelated commands. Next, the commands related to the transmitter 10 are classified into those related to the PLL, the part related to the analog adjustment, and the reset. Commands related to the PLL set the internal registers of the PLL circuit 22. According to the command related to the analog adjustment, the register of the electronic VR (volume) for DC level adjustment inside the DC reproduction circuit 19 is set, and the register of the electronic VR for gain adjustment inside the analog amplifier circuit 20 is set. Although the electronic VR is used for the adjustment of the DC level and the gain here, the same function can be realized by the configuration of the matrix switcher. Finally, these set values are stored in the EEPROM 24.

When the transmitter is reset in the command, the reset circuit 25 initializes the PLL circuit 22, the timing control circuit 27, the multiplexing circuit 29 and the E / O conversion circuit 30. At this time, the command control circuit 23 reads the set value set in the EEPROM 24 and writes the value in the registers inside the PLL circuit 22, the DC reproduction circuit 19 and the analog amplifier circuit 20. Commands unrelated to the transmitter 10 are sent to the multiplexing circuit 29.

The multiplexing circuit 29 serially converts RGB digital data, H, V, CLK and commands. The E / O conversion circuit 30 converts the serial-converted electric signal into an optical signal.

FIG. 3 shows an example of functional blocks of the receiver 11. The input signal to the receiver 11 is an optical signal. The receiver 11 includes a synchronization circuit 31, a clock recovery circuit 32, an O /
It is composed of an E conversion circuit 33, a command control circuit 123, a reset circuit 125, and a restoration circuit 34. The received optical signal is converted into an electric signal by the O / E conversion circuit 33. This signal is supplied to the synchronization circuit 31, the clock recovery circuit 32, and the restoration circuit 34. Clock recovery circuit 32
Restores the clock signal of 1.2 GHz from the electrical signal. This circuit generates a signal so that the frequency and phase are the same as the timing of transmission. The synchronizing circuit 31 extracts V and H synchronizing signals from the electric signal. The clock recovery circuit 32 and the synchronization circuit 31 restore the H, V, and clock to be the same as at the time of transmission. The restoration circuit 34 restores the RGB digital 30-bit data, H, V, CLK, and the command from the electric signal and converts them into parallel data. The restored command is sent to the command control circuit 123, and when the command is the reset of the receiver, the reset circuit 125 initializes the synchronization circuit 31, the clock recovery circuit 32, the O / E conversion circuit 33, and the restoration circuit 34. I do. The restored signal is output to the controller 12.

FIG. 4 shows an example of functional blocks of the controller 12. The controller 12 is a RAM 128, a gamma conversion table 37, a table selection circuit 38, a multiplier 3
6, the command control circuit 223, the EEPROM 124, the reset circuit 225, the noise reduction circuit 40, and the display division circuit 39.

The RGB digital 30-bit data, H, V, CLK and command signals sent from the receiver 11 are input to the controller 12. In the controller 12, the command control circuit 223 controls the inside of the controller 12 according to the command sent from the personal computer 8. If the command is a gamma table setting, the command control circuit 223 writes the gamma value sent from the personal computer 8 to the table number and at the same time E
The same contents are written in the EPROM 124. There are multiple gamma tables. If the command is the display start coordinate, the coordinate value is written in the EEPROM 124, and the coordinate value is also transmitted to the display division circuit 39. Command is displayed /
The same applies to the case of non-display switching. When the command is the selection of the gamma table, the content is transmitted to the table selection circuit 38, and the content is also written in the EEPROM 124. If the command is the setting of the noise reduction value, the content is transmitted to the noise reduction circuit 40, and the same content is written in the EEPROM. If the command is a light emission block adjustment value, its content is transmitted to the LED panel display 15 using a control signal, and the content is written in the EEPROM. The light emission block adjustment value is a function of correcting a difference in brightness and a difference in color tone which are different for each LED panel display 15.

The noise reduction circuit 40 removes the noise from the RGB digital data transmitted from the receiver 11 in consideration of the noise reduction value transmitted by the command. Next, the gamma value of the selected table number is multiplied and inverse gamma conversion is performed to correct the difference between the voltage-luminance characteristic of the CRT and the current-luminance characteristic of the LED. After that, the display division circuit 39
LED panel display 1 considering the display start coordinates
Display division into 5 units and LED panel display 15
The signal is converted into a format that can read the signal.

From the LED panel display 15, L
The ED failure detection result is always transmitted to the controller 12 through the control signal. The controller 12 writes this result in the EEPROM 124. When the personal computer 8 requests a failure detection result, the controller 12 sets the EEPR
The result is read from the OM 124 and transmitted to the personal computer 8 via the receiver 11 and the transmitter 10 as a command signal.

When the controller 12 is reset in the command, the reset circuit 225 causes the display division circuit 3 to operate.
9 and the control circuit 35 are initialized. At this time, the command control unit 223 reads the set value set in the EEPROM 124 and transmits the contents to the control circuit 35, the display division circuit 39, the gamma conversion table 37, the table selection circuit 38, and the noise reduction circuit 40.

[0047]

As described above, according to the present invention, it is provided with means for performing DC level setting, gain setting and PLL setting based on the display signal input to the display signal transmitting means, and means for initializing these settings. By installing a personal computer in the LED display device, A /
Since the DC level, the register value of the electronic VR for gain adjustment, and the internal register value of the PLL can be read and changed with respect to the analog display signal input to the D converter, the volume can be adjusted by the driver while observing the waveform with an oscilloscope as in the past. It is possible to simplify the adjustment work because it is free from the adjustment method of turning. In the unlikely event of an accident, the same display quality as before can be secured in a short period of time only by restoring the previous adjustment value and finely adjusting the inside of the display signal sending means.

Similarly, by reading and changing the EEPROM in the controller from the personal computer installed in the sending unit, display / non-display switching, display start coordinates, gamma conversion table value, gamma conversion table selection, dimming value, The noise reduction value and the light emission block adjustment value can be changed. With this function, it is possible to switch the display state from a remote location, and to correct changes in human visual characteristics that change between daytime and evening by changing the gamma table.

Further, from the personal computer to the E inside the controller
By reading the EPROM, the LED failure detection result can be obtained.

By periodically referring to the LED failure detection result from a remote location, the location and quantity of the failure are known in advance for the regular maintenance, so that it is possible to secure the display quality only by replacing the LED. When the number of LED failures exceeds a certain value, the replacement work can be performed regardless of the regular maintenance, so that the image with a certain quality or higher can be always maintained.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an LED display device according to an embodiment of the present invention.

FIG. 2 is a functional block diagram of a transmitter according to an embodiment of the present invention.

FIG. 3 is a functional block diagram of a receiver according to the embodiment of the present invention.

FIG. 4 is a functional block diagram of a controller according to the embodiment of the present invention.

FIG. 5 is a schematic configuration diagram of a conventional LED display device.

FIG. 6 is a functional block diagram of a conventional receiver.

FIG. 7 is a functional block diagram of a conventional controller.

[Explanation of symbols]

1 TV tuner 2 laser disc player 3 VCR 4 video cameras 5 AV selector 6 amplifier 7 monitors 8 PC 9 Scan converter 10 transmitter 11 receiver 12 Controller 13 speakers 14 power supply 15 LED panel display 16 housing 17 Sending section 18 Display 19 DC regeneration circuit 20 analog amplifier circuit 21 A / D conversion circuit 22 PLL circuit 23, 123, 223 Command control circuit 24, 124 EEPROM 25, 125, 225 reset circuit 26 OSC circuit 27 Timing control circuit 28, 128 RAM 29 Multiplexing circuit 30 E / O conversion circuit 31 Synchronous circuit 32 clock recovery circuit 33 O / E conversion circuit 34 Restoration circuit 35 Control circuit 36 multiplier 37 Gamma conversion table 38 table selection circuit 39 Display division circuit 40 Noise reduction circuit 41 RGB transmitter 42 RGB receiver 43 optical fiber

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) H01L 33/00 H01L 33/00 L H04N 5/66 103 H04N 5/66 103

Claims (7)

[Claims] 1. An LED display section in which a plurality of light-emitting blocks composed of LEDs of one or more colors are arranged in a matrix, display signal sending means for supplying a display signal to be displayed on the LED display section, and the display. A personal computer having a display signal receiving means for receiving a signal from a signal transmitting means, a controller for transmitting display information to the light emitting block, a means for controlling the display signal receiving means and the controller, and managing various settings and set values. The LED is characterized in that the personal computer includes means for performing DC level setting, gain setting and PLL setting based on the display signal input to the display signal transmitting means, and means for initializing these settings. Display device. 2. The LE according to claim 1, wherein the personal computer has means for initializing various settings of the display signal receiving means.
D display device. 3. The personal computer uses the controller to set display start coordinates, gamma coefficient, gamma table,
3. The LED display device according to claim 1, further comprising means for performing dimming value setting, noise reduction value setting, LED failure detection setting, light emission block adjustment value setting, and means for initializing these settings. 4. The method according to claim 1, further comprising means for storing each set value of the display signal sending means and the controller in a separate storage area and automatically restoring these set values when the power is turned on. LED display device according to. 5. The LED display device according to claim 3, wherein a result of the LED failure detection is transmitted from the controller to the personal computer, and the personal computer has means for storing the result. 6. The L according to claim 3, further comprising means for storing a result of the LED failure detection inside the controller.
ED display device. 7. The PC is externally provided with a DC level setting value, a gain setting value, a PLL setting value of the display signal sending means, a display start coordinate value of the controller, a gamma table selection value, a dimming setting value, a noise reduction value. , A means for referring to the failure detection result and the light emission block adjustment value.
The LED display device described.