JP3473626B2 - Image display device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-diagnosis of a display state of an image display device and a self-diagnosis of characteristics such as a high voltage, a high voltage and a current consumption. It is suitable for use. 2. Description of the Related Art FIG. 9 is a block diagram of a large-sized video device. As shown in FIG. 9, a large-sized video device has m × n (1 ≦ m ≦ 9).
6, 1 ≦ n ≦ 96) in a matrix. Light emitting unit 10
0 is three in the vertical direction and four in the horizontal direction in this example as shown in FIG.
It is composed of cells 101 arranged in a row. Cell 10
As shown in FIG. 11, 1 is usually composed of two dots 102 vertically and four dots horizontally, and the dots 102 are B (Blue),
It comprises an element 103 coated with each of R (Red) and G (Green) phosphors. The large-sized video device irradiates each element 103 with an electron beam to emit light, and displays a color image. [0003] Such a large-sized image device is shipped after a test (display test) and an electrical characteristic test of whether or not the display state of each light emitting unit 100 is normal in the manufacturing process. The test of whether or not the display state of each light emitting unit 100 is normal includes a color bar test, a character display test, and the like, in addition to a steer step test in which the luminance is gradually increased to confirm the luminance. These tests are
A test pattern generator is connected to each light emitting unit 100, and the test pattern generator generates the above-described steer step pattern, color pattern, character pattern, and the like, and gives this pattern to the light emitting unit 100. [0004] In the electrical characteristic test, the set is disassembled and connected to a measuring instrument for measurement. As described above, in the conventional test for checking whether the display state of each light emitting unit 100 is normal, a test pattern generator must be connected to the light emitting unit 100. The transportation of the test pattern generator is troublesome, and especially when performing an aging test on a production line, the test pattern generator must be connected to each of all the light emitting units 100. Was. If a defect occurs in the light-emitting unit 100 incorporated as a large screen, the operator must monitor the screen condition from the front and always monitor the screen condition from the front. Was a heavy burden on When measuring various data by inspection or the like in a production line, the set must be disassembled and a measuring instrument must be connected, and wiring is time-consuming, which is a problem. Accordingly, the present invention provides an image which allows self-diagnosis of determination of whether a display state is normal, measurement of electrical characteristics, and the like.
It is an object to provide a display device . According to the present invention, there is provided an image display apparatus for displaying an image by combining a plurality of display units, wherein each of the display units includes a light emitting unit and the display unit. Address storage means configured to be capable of storing address information for specifying a position on the image display device, and the data stored in the address storage means and the address information added to the image data match. If the data stored in the address storage means matches the address information added to the image data, the image data is fetched and output to the light emitting unit, and stored in the address storage means. Data is used to identify the position on the image display device
Given as a value outside the specified numerical range specified in
And a signal processing means for generating an image pattern corresponding to the predetermined numerical value when the numerical value matches the predetermined numerical value and outputting the generated image pattern to the light-emitting unit. Solved by the display device. According to the present invention, there is provided address storage means configured to be capable of storing address information for specifying the position of the display unit on the image display device. The signal processing means (hereinafter referred to as signal processing unit 3) determines whether the data stored in the means matches the address information added to the image data. If the data stored in the address storage unit matches the address information added to the image data as a result of the determination, the signal processing unit 3 captures the image data and outputs it to the light emitting unit. The data stored in the address storage means is used to specify the position on the image display device.
As a value outside the specified numerical range specified for
If it matches the given value obtained, the given value
It is adapted to output to the light emitting unit to generate an image pattern corresponding to the. For example, as shown in FIG.
2, the display unit is identified or the self-diagnosis item of the display state is set to the address, the value of the set address is determined by the signal processing unit 3, and the display state of the light emitting unit 100 according to the address value is tested. To generate test signals. The signal processing unit 3 bidirectionally transmits and receives signals to and from the outside via the communication unit 1 as a transmission / reception unit. Further, the light emitting unit 100 includes a high voltage current measuring circuit 8, a high voltage measuring circuit 9 and a current consumption measuring circuit 10 for measuring electric characteristics, and measures a high voltage, a high voltage and a current consumption. Judge the measurement result. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a light emitting unit and a peripheral device of a large-sized video device according to an embodiment of the present invention. FIG.
As shown in the figure, the light emitting unit 100 has a communication unit 1 for receiving a video signal to which an address has been added, and the light emitting unit 100 has a light emitting unit of 1 to 96 (M in a large NTSC type video device).
ax80 (the number of vertical dots 102 is Max480
Address SW2 which can be set by a manual operation for numbering addresses up to Max 96 (the number of vertical dots 102 is Max 576) in the case of the PAL system.
A signal processing unit 3 for performing self-diagnosis of the display state of the light emitting unit 100 and for performing arithmetic processing on the measurement results of the electrical characteristics, and a ROM (Read Onl) for storing characters such as alphanumeric characters.
4, a memory for storing various display programs such as an all-white 100% light emission routine, a character display routine, and a free-run routine, for example, a ROM 4, a RAM 6 for storing electrical characteristic measurement data,
Built-in A / D converter 7, high voltage current measuring circuit 8, high voltage measuring circuit 9, current consumption measuring circuit 10, cell drive circuit 11 for causing cell 101 to emit light, and communication unit 1 for bidirectional communication with the outside. Have been. Outside the light-emitting unit 100, two-way communication with the communication unit 1 is performed, and an image processing device 13 for organizing the measurement data, and two-way communication with the image processing device 13 are possible so that each measurement data can be easily seen by an operator. Computer 1 for data processing
4. A printer 15 and an external storage device 16 are provided as peripheral devices of the computer 14. FIG. 2 is a diagram showing the configuration of the cell 101. FIG. 2A is an internal configuration diagram, and FIG. 2B is a diagram showing the electrode configuration of the cell. As shown in FIG. 2A, a field switching circuit 22 for alternately emitting a plurality of vertically arranged dots 102 constituting a cell 101 vertically is provided. As shown in FIG. 2B, the field switching circuit 22 is connected to cathodes 203 arranged vertically corresponding to each element 103, and an upper and lower cathode 203 group is controlled by an inverter 23 arranged in the field switching circuit 22. Are applied to each other. Therefore, since the High and Low signals are alternately applied to the cathode 203 vertically, the upper and lower elements 103 can emit light alternately. Twelve pulse width modulators (PWs) common to the top and bottom of each dot 102 for the entire cell
M21). The PWM 21 is supplied with an 8-bit video signal, and a G1 electrode 202 arranged corresponding to each element 103 as shown in FIG.
Are applied with PWM-modulated R, G, and B image signals, and a color image is displayed. The G2 electrode 201 prevents the electric field generated by the anode 200 from affecting the G1 electrode 202. The signal processing unit 3 compares the address added to the video signal received by the communication unit 1 with the address given by the address SW2, and takes in the video signal if they match. Since the unit address is a vertical line number and m is a maximum of 96, the address value used to capture this video signal is 1 to 96. On the other hand, in the address SW2, an 8-bit value from 0 to 255 can be set. Since the address values of 0 and 97 to 255 are not used, this unused value is
The display state of 0 was used for self-diagnosis. In this embodiment, the relationship between the address value and the contents of the self-diagnosis is set as follows in order to perform the self-diagnosis among the unused address values. [0016] Next, the contents of the self-diagnosis test will be described. (1) R, G, and B elements 103 that constitute the light emitting cell 101 with 100% all white
Are emitted at the same luminance. (2) Character display The cell 101 is caused to emit light so that characters such as alphanumeric characters are displayed. (3) Free run (a) Steering step FIG. 3 confirms whether the light emitting unit 100 represented by 8 bits (256 gradations) as luminance information is operating normally for each of the 8 bits. This is a luminance pattern to be performed. As shown in FIG. 3, in pattern 1, the element 103 does not emit light, and in pattern 2 to pattern 9, the luminance data has twice the value of each step. It is confirmed whether the element 103 emits light twice as bright. Pattern 10
Is luminance data of the maximum luminance. (B) The entire color bar light emitting unit 100 emits light, for example, in the order of Blue → Red → Magenta → Green → Cyan → Yellow → White.
For example, if a certain dot emits magenta when emitting blue light, it can be understood that the dot is an internal defect (for example, a cause such as a solder bridge). (4) Beam blank It is determined whether the field switching circuit 22 shown in FIG.
Are alternately emitted to confirm. Next, a process of self-diagnosing the display state of the light emitting unit 100 will be described with reference to FIG. First, in order to make a self-diagnosis of the display state of the light emitting unit 100, the address value of the address SW2 is set to any one of 97 to 99 according to the content of the self-diagnosis. Then, the signal processing unit 3 reads the address value set by the address SW2 and determines whether the address value is 97 (step 40). When the address value is 97, the signal processing unit 3 reads and executes the all-white 100% light emission routine stored in the ROM 4. All white 100
In the% routine, an 8-bit test pattern (for example, 'FF') is generated, and the same test pattern is transmitted to all the cell drive circuits 11. In the cell drive circuit 11, after storing the test pattern in a register (not shown), the test pattern is driven by a control line (not shown) connected to the cell drive circuit 11, converted into PWM luminance data, and applied to the PWM 21. You. PWM for PWM21
The brightness is applied to the grid electrode and the grid electrode to cause the dots 102 to emit light with 100% all white. If the address value is not 97, the signal processing section 3 determines whether the address value is 98 (step 4).
1). When the address value is 98, the signal processing section 3 reads and executes the character display routine stored in the ROM 4. ROM4 in the character display routine
A test pattern for generating a character character such as an alphanumeric character stored in the cell drive circuit 11 is read, and the test pattern is sent to the cell drive circuit 11. The cell drive circuit 11 is driven by the control line, and outputs the PWM luminance data to the PWM.
The light emitting element 103 is caused to emit light to display the character characters. If the address value is not 98, the signal processing unit 3 determines whether the address value is 99 (step 4).
2). If the address value is 99, the signal processing unit 3
The free-run routine stored in M4 is read and executed. In the free-run routine, first, the pattern signal of the steering step shown in FIG. 3 is created, and then the pattern signal is sent to each cell drive circuit 11. Cell drive circuit 1
After storing the pattern signal in the register, the PWM 21
To make the sending element 103 emit light. At this time, since the luminance represented by the pattern signal is sequentially increased, the luminance is visually confirmed by the light emitting element 103. Next, the signal processing section 3 reads and executes a color bar test routine stored in the ROM 4. The color bar test routine generates a test signal to emit blue light and sends the test signal to the cell drive circuit 11. The cell drive circuit 11 sends a Blue test signal to the PWM 21 provided in the cell 101 to cause the Blue element 103 to emit light. Next, similarly, the color bar test routines are Red, Magenta, Green, Cyan and Whit
The corresponding test signals are generated in the order of e to cause the elements 103 to emit light sequentially. Next, the free-run routine checks whether the field switching circuit 22 is operating normally.
For example, a test signal that emits light at 100% full white and a test signal that does not emit light at all are created so as to be synchronized with the high and low or the low and high of the field switching signal applied to the cathode, and sent to the cell drive circuit 11. The cell drive circuit 11 sends a test signal to the upper and lower PWM 21 and
The element 103 emits light. If the field switching circuit 22 operates normally, one of the upper and lower elements 103 arranged in the cell 101 emits light. If the value set by the address SW2 is 9
If the value is different from any of 7 to 99, the communication units 1 to 8
Address and address SW added to bit video signal
If the values set by 2 match, the video signal is sent from the signal processing unit 3 to the PWM 21 via the cell drive circuit 11 to cause the element 103 to emit light and display the video signal. The test signal for self-diagnosing the display state of the light emitting unit 100 is repeatedly generated unless the address value is changed by the address SW2, so that a long time test (eg, aging) can be suitably performed. Next, self-diagnosis of electrical characteristics such as high voltage current, high voltage and current consumption will be described. FIG. 5 is a circuit diagram of a high voltage current measuring circuit 8 for measuring a high voltage current. As shown in FIG. 5, a high voltage power supply circuit 50 is connected to a constant voltage circuit 51 to be described later to keep the voltage constant. The constant voltage circuit 51 is the cell 1
01 is connected to the anode. High voltage power supply circuit 50
Is connected to a voltage detection resistor R1 for detecting a voltage and a + terminal of a voltage follower (OP1). The high-voltage current is converted into a voltage by the voltage detection resistor R1, received by the voltage follower OP1, and impedance-converted. Since the detection voltage obtained from the voltage detection resistor R1 is a negative voltage, the voltage is inverted and amplified by the inverting amplifier (OP2) at an amplification factor G = R3 / R2. Finally, the ripple is cut by a secondary low-pass filter (OP3) to obtain an input signal to the A / D converter 7. FIG. 6 is a circuit diagram for measuring a high voltage. As shown in FIG. 6, the high power supply voltage circuit 50 is connected to a constant voltage circuit 51 to keep its voltage constant.
61 is a voltage control transistor which is a large capacity transistor for voltage control, 62 is a voltage control drive transistor,
A protection transistor 63 conducts when the load current increases, lowers the base electrode of the voltage control drive transistor 62, cuts off the voltage control transistor 61, and prevents the voltage control transistor 61 from being destroyed.
Reference numeral 64 denotes an error detection transistor whose output voltage is a resistance R11.
And a partial pressure at R12 is applied to the base. On the other hand, a constant voltage diode 65 is connected to the emitter of the error detection transistor 64, and the output voltage is applied through the resistor R13, so that a constant voltage is always maintained.
For this reason, the error detection transistor 64 converts a change in the base voltage into a change in the collector voltage, and outputs the resistances R14 and R1.
5, the output voltage is kept constant by changing the base current of the voltage-controlled drive transistor 62. Therefore, when the output voltage rises, the resistance R11
Since the current flowing through R12 and R12 increases, the voltage rises at the connection between resistors R11 and R12 by the rise in the output voltage. Therefore, resistors R11 and R12 are also used as constant power supply circuit 51, and resistors R11 and R12 By connecting the connection point between R11 and R12 and the A / D converter 7 as the measuring circuit 9, a high voltage can be measured. FIG. 7 is a circuit diagram of the current consumption measuring circuit 10. As shown in FIG. 7, the AC power supply is connected to terminals A and C of a bridge rectifier circuit 52 for performing double-wave rectification. The terminal B of the bridge rectifier circuit 52 is connected to a capacitor, and the output is smoothed. The smoothed output is input to a switching regulator circuit (not shown). The GND terminal D of the bridge rectifier circuit 52 is connected to the voltage detection resistor R. The current consumption of the switching regulator circuit is detected by a voltage detection resistor R. This is received by a voltage follower (OP11), impedance-converted, and then inverted and amplified by an inverting amplifier (OP12). Finally, the ripple is cut by a secondary low-pass filter (OP13), and A /
The input signal of the D converter 7 is used. Next, a process of self-diagnosis of high-voltage current, high-voltage and electric characteristics of a consumption battery will be described with reference to FIG. As shown in FIG. 8, the system power supply for starting the signal processing section 3 is turned on (step 30). Next, the signal processing unit 3 creates 8-bit luminance data to turn on the cell 101 and sends the luminance data to the cell drive circuit 11. The luminance data is transmitted from the cell drive circuit 11 to the PWM 21 and a predetermined cell 101 is turned on. Then, the high-voltage current is measured by the high-voltage current measurement circuit 8 with the predetermined cell 101 turned on (step 31). The measured high-voltage current is converted into a digital signal of a predetermined bit (for example, 8 bits) by the A / D converter 7 and input to the signal processing unit 3. The signal processing unit 3 determines whether the high voltage current value converted into the digital signal is normal,
Along with this determination, the high voltage current value is stored in the RAM 6. Next, the signal processing section 3 sends a signal for turning off the lit cell 101 to the cell drive circuit 11, turns off the cell 101, turns on the next unmeasured cell 101, measures the high voltage current (step 31) and measures Data storage (Step 3
Perform 2). These steps 31 and 32 are sequentially performed on all the cells 101 in the light emitting unit 100. Next, the signal processing section 3 sends a signal for simultaneously lighting all the cells 101 in the light emitting unit 100 to the cell drive circuit 11, and simultaneously lights all the cells 101. Next, a high voltage current is measured by the high voltage current measuring circuit 8 in a state where all the cells 101 are turned on (step 3).
3). Next, the high voltage current measured in step 33 is A
The signal is converted into a digital signal by the / D converter 7, processed by the signal processing unit 3, and stored in the RAM 6 (step 34). Next, the voltage value of the high voltage input from the high voltage power supply circuit 50 is measured by the high voltage measurement circuit 9 (step 35). After the measured high voltage is converted into a digital signal by the A / D converter 7, the signal processing unit 3
Is input to The signal processing unit 3 performs arithmetic processing on the input digital signal, determines whether the voltage input from the high-voltage power supply circuit 50 is normal, and
It is determined whether or not the voltage input from is normal, and the high voltage value is stored in the RAM 6 together with the result of this determination (step 36). Next, the current consumption of the switching regulator is measured by the current consumption measuring circuit 10 in a state where each cell 101 is lit and all the cells are lit (step 37). Next, the A / D converter 7 converts the measured current consumption into a digital signal and inputs the digital signal to the signal processing unit 3. The signal processing unit 3 performs arithmetic processing on the digital signal, determines whether or not the measured current consumption is normal, and stores the determination result and the current consumption in the RAM 6 (step 38). Next, normal image data is displayed (step 39). The signal processing unit 3 sends the RA
It is determined whether there is a request to send out the measurement data stored in M6 (step 40). If there is no request for sending the measurement data, the procedure goes to step 39. If there is a request to send measurement data, the signal processing unit 3 reads the measurement data stored in the RAM 6 and transmits the measurement data to the image processing device 13 via the communication unit 1. The image processing device 13 arranges these measurement data for each light emitting unit 100 and transmits the data to the computer 14 which is bidirectionally connected. The computer 14 displays various data in a manner that is easy for the operator to see, and prints out the data to the printer 15.
The data is stored in the external storage measurement 16 (step 4
1). Next, go to step 39. The following defects can be determined from the above measured data. (1) No high voltage current is output in step 31. The cell 101 does not light due to a defect such as a leak or a high-voltage fuse blown. (2) In step 31 or step 33, a high voltage current flows too much. This is due to an increase in the high voltage current due to the deterioration of the cell 101. (3) No high voltage is output in step 35. This is due to a defect in the high-voltage power supply circuit 50. In the present embodiment, high-voltage current, high-voltage and current consumption were measured as self-diagnosis of electrical characteristics.
In addition, the voltages of the bias power supply and the heater power supply applied to the cell 101 can be measured by inserting a voltage dividing resistor or a shunt resistor. In addition, this embodiment
According to, the test pattern is displayed by the light emitting unit alone.
Connected to a test pattern generator.
It can be easily inspected. Especially at the production line
Many units can be aged simultaneously for inspection
Can be improved. Also light emitting unit
Measures high-voltage current, high-voltage and current consumption with a single knit
Can be easily set without disassembling the set.
Measurement and improve inspection throughput.
Wear. Collectively manages measurement data by computer
Therefore, the display operation status of all units can be grasped.
You. In addition, it is easy to analyze the causes of various defects,
Can respond quickly to good. As described above, according to the present invention, the address information for specifying the position of the display unit on the image display device matches the address information added to the image data. If the two address information match, the image data is captured and output to the light emitting unit, and the data stored in the address storage means is used to specify the position on the image display device. Determined
Given as a numerical value outside the specified numerical range
In the case of a signal processing unit that generates an image pattern corresponding to the predetermined numerical value and outputs the generated image pattern to the light emitting unit when the numerical value matches the predetermined numerical value . With this configuration, address information for specifying the position of each display unit on the image display device and command information for generating test image data are commonly stored in a single storage unit (address storage unit). can do. Therefore, it is possible to simplify the configuration of the display unit and reduce costs.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram of a light emitting unit and peripheral devices according to an embodiment. FIG. 2 is an internal configuration diagram of a cell 101. FIG. 3 is a steer step test pattern. FIG. 4 is a self-diagnosis processing flow of a display state of a light emitting unit. FIG. 5 is a diagram showing connection of a high-voltage current measuring circuit 8; FIG. 6 is a diagram showing connection of a high-voltage measuring circuit 9; FIG. 7 is a diagram showing connection of the current consumption measuring circuit 10; FIG. 8 is a diagram showing a flow of an electric characteristic measurement process. FIG. 9 is a configuration diagram of a large-sized video device. FIG. 10 is a configuration diagram of a light emitting unit 100. FIG. 11 is a configuration diagram of a cell 101. [Description of Signs] 1 Communication unit 2 Address SW 3 Signal processing unit 4 ROM 6 RAM 7 A / D converter 8 High voltage current measurement circuit 9 High voltage voltage measurement circuit 10 Current consumption measurement circuit 11 Cell drive circuit 13 Image processing device 14 Computer 15 Printer 21 PWM 22 Field switching circuit 23 Inverter 50 High voltage power supply circuit 51 Constant voltage circuit 52 Bridge rectifier circuit 61 Voltage control transistor 62 Voltage control drive transistor 63 Protection transistor 64 Error detection transistor 65 Diode 100 Light emitting unit 101 Cell 102 Dot 103 Element

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 17/00-17/06 G09F 9/00-9/00 366 G09G 3/00-3/38

Claims (1)

(57) [Claim 1] In an image display device for displaying an image by combining a plurality of display units, each of the display units includes a light-emitting unit and a display unit for the display unit. Address storage means configured to be able to store address information for specifying the position in the data storage unit; and determining whether data stored in the address storage means matches the address information added to the image data. When the data stored in the address storage means matches the address information attached to the image data, the image data is taken in and output to the light emitting unit, and the data stored in the address storage means is displayed on the image display. On the device
Out of the specified numerical range specified to identify the position of
Matches a given number given as a number in
And a signal processing unit for generating an image pattern corresponding to the predetermined numerical value and outputting the generated image pattern to the light emitting unit.