JP2008172343A - White balance adjustment system and method, and pdp display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To exhibit the light emission characteristics of a PDP sufficiently by taking account of at least one of APC and variation in luminance incident to temperature variation. <P>SOLUTION: A PC 40 displays a white display region having a size equal to 1% of the entire screen substantially in the center of the screen of a PDP display 10, acquires the luminance of each color component of RGB constituting a video image obtained by imaging the white display region by means of a color analyzer 20, acquires temperature information by measuring the temperature of the white display region through a temperature sensor 30, corrects the luminance of each color component of RGB based on the temperature information, and sets an adjustment value altered such that the luminance ratio of each color component after correction indicates a predetermined white in a semiconductor memory 15. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a white balance adjustment system, a white balance adjustment method, and a PDP display device.

  Conventionally, in white balance adjustment of a PDP display device, white display is performed on the entire screen, the display luminance is set to 20% and 70% of the maximum luminance, and the white balance is performed by a two-point tracking method based on these two display luminances. Had been adjusted. However, in the PDP display device, a technique called APC (Automatic Power Control) is generally used as a technique for automatically adjusting the wave number of the sustain pulse in accordance with the content of the video signal to adjust the screen brightness. By this APC, the power consumed by the PDP display device is controlled to be constant.

  FIG. 9 shows an example in which APC is performed so that the luminance is reduced to about 15% of the maximum luminance at the maximum display amount. Here, the display amount is an amount expressed by display amount = number of pixels × luminance, and when APC is applied, control is performed so that the maximum display amount = a × constant power (a is a constant). In the example of FIG. 9, when the maximum display amount is 0 to 20% (that is, when the output is 0 to 20%), the maximum output luminance is 100%, but the maximum display amount exceeds 20% (that is, the output is 20%). The maximum output brightness gradually decreases.

  That is, when white balance adjustment is performed by displaying white on the entire screen, if the luminance is set to 70%, the maximum display amount is 70%, so the actual output luminance is about 23%, and if the luminance is set to 20%. Since the maximum display amount is also 20%, the actual output luminance is about 75%. Therefore, in the conventional white balance adjustment, the white balance is adjusted substantially at a luminance of 15% and 16% of the maximum output luminance. Therefore, the white balance cannot be adjusted on the high luminance side, and the white balance cannot be adjusted accurately.

  The PDP also has a characteristic that the luminance changes as the temperature rises. FIG. 10 is a graph showing the luminance vs. temperature characteristics of the PDP. As shown in FIG. 10, when the output luminance at the time when the display of the PDP display device is started is 100%, the temperature (surface temperature) of the PDP increases with time, and the output luminance decreases with time. This decrease in output brightness naturally occurs even during white balance adjustment, and white balance adjustment is not performed correctly with conventional white balance adjustment that did not take into account this decrease in output brightness. It was.

  By the way, the following is known as a technique that takes into account the luminance change of the PDP display device over time. That is, Patent Document 1 describes a plasma display display device that includes a fan for cooling a PDP, measures the surface temperature of the PDP with a measuring instrument, and controls the fan so that the surface temperature becomes constant.

However, the technique of Patent Literature 1 is a description for keeping the temperature of the PDP constant so that the preset white balance is correctly reflected, and is not a technique for setting the white balance appropriately. .
JP-A-10-232647

  As described above, in the white balance adjustment in the conventional PDP display device, the two points of the luminance change due to the APC and the luminance change due to the temperature change of the PDP are not considered, and the white balance adjustment is not accurately performed. There was a problem. Further, the technique of Patent Document 1 is not a technique for adjusting white balance.

  The present invention has been made in view of the above-described problems. By considering at least one of APC and a luminance change accompanying a temperature change of the PDP, the light emission characteristics of the PDP can be sufficiently exhibited. An object is to provide a white balance adjustment system, a white balance adjustment method, and a PDP display device.

In order to solve the above problems, in the white balance adjustment system of the present invention, an adjustment value for adjusting the white balance of an input video signal is stored in a nonvolatile semiconductor memory, and the adjustment value is referred to. A PDP display device that performs white balance adjustment on the video signal, performs APC control, and displays the video subjected to the white balance adjustment on a predetermined screen, and an adjustment device that sets the adjustment value in the PDP display device In the white balance adjustment system for a PDP display device, the adjustment device inputs a white image input means to the PDP display device for a video signal to be displayed in white in a predetermined area that is a part of the screen of the PDP display device. And luminance acquisition means for acquiring the luminance of each color component constituting the captured image by imaging the predetermined area displayed in white , Certain adjustment values luminance ratio of the color components constituting the captured image is changed to a predetermined ratio as configuration and an adjustment value setting means for setting to the semiconductor memory.
In the above configuration, the white image input means inputs a video signal to be displayed in white in a predetermined area which is a part of the screen of the PDP display device, and the luminance acquisition means is the predetermined area in which the white display is performed. The luminance value of each color component constituting the captured video is acquired and the adjustment value setting means changes the adjustment value so that the luminance ratio of the color component constituting the captured video becomes a predetermined ratio. Set to the semiconductor memory.
That is, since white is displayed not on the entire screen but on a part of the screen, the display amount (display amount = number of pixels × luminance) is reduced, and the limitation of output luminance by APC control in white balance adjustment can be reduced. It becomes possible. Therefore, accurate white balance adjustment is possible.

  Of course, it is more preferable that the predetermined area has a size that the APC control does not limit the output luminance in the white balance adjustment. More specifically, in the case of a PDP display device in which the APC control does not work when the display amount is A% or less, when the white balance is adjusted at the brightness B%, the size of white display is set to A × 100 of the size of the entire screen. / B% or less may be set.

Then, a luminance fluctuation calculating unit that acquires temperature information of the predetermined area and calculates a luminance fluctuation amount based on the temperature information, and a luminance correction that corrects the luminance acquired by the luminance acquisition unit based on the luminance fluctuation amount And the adjustment value setting means may set the adjustment value changed so that the luminance ratio of the color component corrected by the luminance correction means becomes a predetermined ratio.
In this configuration, the luminance fluctuation calculating unit acquires temperature information of the predetermined region, calculates a luminance fluctuation amount based on the temperature information, and the luminance correcting unit uses the luminance acquired by the luminance acquiring unit as the luminance fluctuation. The adjustment value is corrected based on the amount, and the adjustment value setting unit sets the adjustment value changed so that the luminance ratio of the color component after the luminance correction unit corrects becomes a predetermined ratio in the semiconductor memory. Thus, by correcting the luminance according to the temperature, it is possible to adjust the white balance more accurately.

  That is, the brightness of each color component acquired by the brightness acquisition means is not used for white balance as it is, but the brightness of each color component is corrected based on the temperature information. More specifically, when the luminance of a predetermined area displayed in white is B and the temperature is T, if the luminance change rate of any color component with respect to the luminance immediately after power-on is Z%, the correction is performed. The later luminance is B × 100 / Z.

Further, a plurality of the predetermined areas may be set on a predetermined screen of the PDP display device, and the white video input unit may input a video signal for displaying white in each predetermined area in order to the PDP display apparatus.
In this configuration, since a plurality of predetermined areas are set, even if there are variations in the light emission characteristics of the light emitting cells of the PDP, it is possible to adjust the white balance that reflects the light emission characteristics of the entire screen, and the white that absorbs the variations in the light emission characteristics The balance can be set. Therefore, more accurate white balance adjustment is possible.

  Further, when a plurality of predetermined sections are set, the adjustment value setting means may change the adjustment value based on an average of data acquired from the plurality of predetermined areas. According to this configuration, it is possible to adjust the white balance reflecting the light emission characteristics of the entire screen.

  Further, when setting a plurality of predetermined sections, the adjustment value setting means sets the adjustment value based on the data acquired from the plurality of predetermined areas so that the luminance at the center of the screen of the PDP display device becomes the maximum luminance. Of course, it is possible to change the configuration. According to this configuration, since the luminance at the center of the screen is maximized, white balance adjustment suitable for a television receiver can be performed.

  Furthermore, the above-described white balance adjustment system can be realized as a single device, and is not necessarily limited to a substantial device, and there is no difference in its effectiveness as a method. Of course, such a white balance adjustment system and a PDP display device may exist alone or may be used in a state of being incorporated in a certain device. The embodiment is included.

As described above, according to the present invention, it is possible to provide a white balance adjustment system for a PDP display device capable of accurate white balance adjustment.
According to the invention of claim 3, it is possible to adjust the white balance more accurately.
According to the invention of claim 4, it is possible to adjust the white balance more accurately.
Further, according to the invention of claim 5, it is possible to adjust the white balance more accurately.
According to the invention of claim 6, it is possible to adjust the white balance more accurately.
According to the seventh aspect of the invention, it is possible to adjust the white balance more accurately.
According to the invention of claim 8, it is possible to adjust white balance suitable for a television receiver.
Furthermore, it is needless to say that in a more specific configuration as in claim 1, the same effects as those of the inventions of claims 2 to 8 described above are exhibited.

Hereinafter, embodiments of the present invention will be described in the following order.
(1) Configuration of white balance adjustment system:
(2) White balance adjustment processing:
(3) Modified example of white balance adjustment processing:
(4) Summary:

(1) Configuration of white balance adjustment system:
A white balance adjustment system of a PDP display device according to an embodiment of the present invention will be described with reference to FIGS. Of course, the PDP display device may be a plasma television having a tuner function.
FIG. 1 is a system configuration diagram showing a schematic configuration of a white balance adjustment system 100 of a PDP display device. A white balance adjustment system 100 according to the present invention includes a PDP display device 10 that is an object of white balance adjustment, a color analyzer 20, a temperature sensor 30, and a PC (Personal Computer) 40. The PDP display device 10 is connected to the PC 40 via a predetermined cable C1, and is also connected to the PC 40 via another predetermined cable C2.

  The color analyzer 20 captures an image of the screen of the PDP display device 10 and outputs luminance values (luminance information) of RGB colors. The temperature sensor 30 measures the temperature of the screen of the PDP display device 10 and outputs temperature information. The PC 40 acquires the brightness value from the color analyzer 20 and the temperature information from the temperature sensor 30, and sets the white balance adjustment value in the PDP display device 10 based on the acquired brightness value and temperature information.

  FIG. 2 is a block diagram illustrating the configuration of the color analyzer 20, and FIG. 3 is a block diagram illustrating the configuration of the PDP display device 10. FIG. 4 is a block diagram showing the configuration of the PC 40.

  The color analyzer 20 includes, as an optical system, a CCD image pickup device 21, a controller 22a to which the CCD image pickup device 21 is connected, a lens control system 22b, and the like. Further, as a control system, an analog / digital conversion circuit (A) connected to a microcomputer 23a and a controller 22a having a CPU, ROM, RAM, I / O port and the like connected to an internal bus and connected to a CCD image pickup device 21. / D conversion circuit) 23b, an interface (I / F) 23c to which a predetermined cable C2 is connected, and the like are connected to the system bus 20a.

  A controller 22a is connected to the I / O port of the microcomputer 23a, and the microcomputer 23a controls the operation of the controller 22a and outputs a digital luminance value (measured value) from the A / D conversion circuit 23b via the system bus 20a. It is possible to read and output to the outside from the I / F 23c. The PC 40 is connected to the I / F 23c via a cable C3.

  With the above configuration, the color analyzer 20 having the CCD image pickup device picks up an image of a predetermined area (a white display area to be described later) on the screen of the PDP display device 10 when a signal indicating an image pickup instruction from the PC 40 is input. The image sensor 21 detects the luminance as a corresponding voltage for each CCD image sensor, converts it to a digital voltage value (256 gradations from 0 to 255) corresponding to the voltage detected by the A / D conversion circuit 23b, and after the conversion Is detected as a luminance value. Then, the color analyzer 20 outputs the detected luminance value to the PC 40 via the I / F 23c and the cable C3.

  As the temperature sensor 30, an element 30a that reacts to a temperature change is connected, and a voltage corresponding to the temperature change can be output. Similar to the color analyzer 20, the temperature sensor 30 is connected to the I / O board 40 j of the PC 40, and can output a signal corresponding to a temperature change to the PC 40. At the time of white balance adjustment, the element 30a of the temperature sensor 30 measures the screen temperature in a predetermined region. The element 30a that reacts to a temperature change includes an element that generates an electromotive force according to a change in heat such as a thermocouple, a element that changes in resistance value according to a change in heat such as a thermistor, and a platinum resistance thermometer. A non-contact type radiation thermometer or the like that measures the temperature by measuring the resistance of a metal like a body can be used.

  The PDP display device 10 includes a video signal input terminal 18, an RGB signal generation circuit 11, an RGB signal processing circuit 12, a synchronization separation circuit 13, a drive circuit 17, a microcomputer 14, a nonvolatile semiconductor memory 15, PDP19. The IIC bus 16 is connected to an IIC bus data port 16a, a microcomputer 14, a semiconductor memory 15, an RGB signal generation circuit 11, an RGB signal processing circuit 12, and the like. These circuits are connected to each other via the IIC bus 16 and transmit / receive serial data.

  The synchronization separation circuit 13 separates the synchronization signal from the decoded video signal, generates a timing signal in synchronization with the clock signal of the oscillation circuit CLK2, and supplies the timing signal to each part of the PDP display device 10 via the IIC bus 16. Then, the signals processed in the PDP display device 10 are synchronized.

  The RGB signal generation circuit 11 generates a primary color video signal composed of red (R), green (G), and blue (B) from the decoded video signal input via the video signal input terminal 18 to generate an RGB signal processing circuit. 12 is output. The video signal input terminal is a terminal capable of inputting a video signal such as a composite terminal or a component terminal.

  The RGB signal processing circuit 12 performs predetermined processing under the control of the microcomputer 14. A memory 12e composed of a RAM is connected to each of the units 12a to 12d, holds frames for adjusting image quality such as adjustment values for white balance adjustment, and stores video data consisting of RGB signals for one screen. It also functions as a memory.

  The pixel number conversion circuit 12a, also referred to as a scaler, performs a predetermined scaling process for converting the number of pixels in accordance with the number of pixels of the PDP 19 with respect to the input RGB signal, matches the timing with the timing signal, The RGB signal is written into the memory 12e.

  The image quality adjustment circuit 12b sequentially refers to the gradation value of each pixel for each color from the memory 12e, and performs white balance, contour correction, OSD signal superimposition on the gradation value constituting the RGB signal after the pixel number conversion, Adjustment processing such as saturation correction is performed.

  The γ correction circuit 12 c performs gamma correction on the RGB signal after the adjustment process, and compensates for the gamma characteristic of the display of the PDP display device 10.

  The luminance / contrast adjustment circuit 12d performs luminance adjustment and contrast adjustment processing on the video data after the gamma correction expressed by the gradation value for each color pixel stored in the memory 12e, and sends it to the control circuit 17a. Output.

  The microcomputer 14 includes a CPU, ROM, RAM, a plurality of I / O ports, a timer circuit (not shown), and the like connected to an internal bus. The microcomputer 14 is used for internal circuit control written in the ROM or the semiconductor memory 15. The function as the PDP display device 10 is realized by controlling the entire PDP display device 10 according to the program.

  The semiconductor memory 15 stores information corresponding to the adjustment values for each of the RGB colors that are referred to when white balance is adjusted in the display of the PDP display device 10. Of course, this information may represent adjustment values for each color of RGB, may represent adjustment values for CMY (cyan, magenta, yellow), or may be a color for representing a specific color. As long as it shows a mixing ratio of

  The drive circuit 17 includes a control circuit 17a, a pixel data generation circuit 17b, and a row electrode drive circuit 17c. The pixel data generation circuit 17b and the row electrode drive circuit 17c are connected to the column electrode and the row electrode of the PDP 19, respectively, and apply a voltage to each pixel specified by the column electrode and the row electrode.

  The control circuit 17a outputs a signal (pixel data signal) obtained by time-dividing the RGB signal processing circuit 12 based on the timing signal. The pixel data generation circuit 17b drives the column electrode of the PDP 19 based on the pixel data signal output from the control circuit 17a. The row electrode drive circuit 17c controls the row electrode of the PDP 19 based on the timing signal.

That is, the column drive voltage generated by the pixel data generation circuit 17b is applied to each column electrode in synchronization with the horizontal synchronization signal output from the control circuit 17a, and then the row electrode drive circuit 17c generates the generated scan pulse. Is applied to each row electrode in synchronization with the vertical synchronizing signal.
As shown in FIG. 4, the PC (adjustment computer) 40 includes a CPU 40a, a ROM 40b, a RAM 40c, a display driver (DSPDRV) 40d, a hard disk drive (HDD) 40e, an input I / F 40f, and an I / O port 40g. The communication port 40h, the I / O board 40j, the video signal output terminal 40i, and the like are connected.

  For example, an LPT port, an RS-232 port, a COM port, or the like can be used as the communication port 40h. A display 41d1 is connected to the DSPDRV 40d, and a keyboard 40f1 and a mouse 40f2 are connected to the input I / F 40f. The IIC bus data port 16a of the PDP display device 10 is connected to the communication port 40h via the cable C1, and the color analyzer 20 is connected to the I / O board 40j via the cable C3. The video signal input terminal 18 of the PDP display device 10 is connected to the video signal output terminal 40i via the cable C2.

  The CPU 40a executes a predetermined control program written in the ROM 40b while using the RAM 40c as a work area. The HDD 40e stores an application program (APL) for determining an adjustment value for white balance adjustment and storing it in the PDP display device 10, an APL for generating a reference video signal, and an ideal RGB color balance. The data is read into the RAM and APL is executed.

  Based on the above hardware, the PC 40 displays a white test pattern on the screen of the PDP display device 10, causes the color analyzer 20 to measure the color of the projected test pattern, and measures the surface temperature of the PDP 19 with the temperature sensor 30. And a process of setting an adjustment value for adjusting the white balance in the PDP display device 10 in accordance with the color measurement and measurement results.

  Various PCs such as a desktop type, a notebook type, and a mobile type can be adopted as the PC 40, but a dedicated computer other than the PC can also be adopted. The PC 40, the color analyzer 20, and the temperature sensor 30 constitute an adjustment device that sets a white balance adjustment value in the PDP display device.

(2) White balance adjustment processing:
Hereinafter, the processing of the CPU 41a that performs white balance adjustment of the PDP display device 10 will be described with reference to the flowchart of FIG. FIG. 5 shows the processing of the PDP display device and the processing of the PC 40. The processing of steps S110 to S134 is the processing of the PC 40 that executes APL, and the processing of steps S210 to S224 is executed by the PDP display device 10. Indicates processing. In the following description, “step” is omitted.

  The white balance adjustment performed in the present embodiment is a two-point tracking method in which white balance adjustment is performed at a luminance of 23% and a luminance of 70%, respectively, and the white balance adjustment at the luminance between the two points is complemented by a near-linear line. However, of course, the present invention may be applied to various conventionally known white balance adjustment methods.

  In the present embodiment, the PC 40 to which the color analyzer 20 and the temperature sensor 30 are connected is configured to adjust the white balance of the PDP display device 10, but is realized as a single PDP display device 10 having these inside. Of course. When white balance adjustment is possible with the PDP display device 10 alone, a program for white balance adjustment is stored in the ROM of the microcomputer 14 or the semiconductor memory 15, and a color analyzer and a temperature sensor are also provided in the PDP display device 10. Shall be.

  This white balance adjustment is performed in the final adjustment process of the PDP display device 10. At this time, the initial value of the white balance adjustment value is stored in advance in the semiconductor memory 15 (S210), and this process is performed. Then, when a factory operator turns on the power of the PDP display device 10 that performs white balance adjustment and performs a predetermined operation, the PDP display device 10 shifts to the white balance adjustment mode (S212).

  Then, the PDP display device 10 is in a state where the memory 12e and the semiconductor memory 15 can be rewritten via the IIC bus data port 16a. Also in this adjustment mode, when a video signal is input from the video signal input terminal 18, the PDP display device 10 displays a video corresponding to the input video signal on the screen. Then, the worker connects the data communication port of the PC 40 and the IIC bus data port 16a, and connects the video signal output terminal and the video signal input terminal 18 of the PC 40. As a result, the PC 40 can be connected to the IIC bus 16 via the IIC bus data port 16a, and can be rewritten by accessing the semiconductor memory 15 or the memory 12e.

  When preparation for white balance adjustment is completed as described above, the PC 40 outputs a white image with a display luminance of 23% of the maximum luminance as a video signal from the video signal output terminal (S110). Then, a video signal is input to the video signal input terminal 18 of the PDP display device 10, and a video corresponding to the input video signal is displayed on the PDP 19 (S214).

  The white video signal output by the PC 40 in S214 is a video signal that is displayed in white in a predetermined area of a part of the screen of the PDP and black in other areas. FIG. 6 shows an example of an image displayed on the PDP 19 by a white image signal. As shown in the figure, the video signal output from the PC 40 has a white display area that is 1/10 of the screen size of the PDP 19 (1% of the screen size of the PDP 19) in both the vertical and horizontal directions in the approximate center of the PDP 19 and other than the white display. This is a video signal in which the part of the image becomes a black display area (no display).

  That is, since the luminance is 0 in the black display area and the luminance exists only in the white display area, the display amount is 1/100 compared with the case where white display is performed on the entire screen. For example, in the case of a PDP having APC characteristics as shown in FIG. 9, even when the luminance of the white display area is displayed at the maximum luminance, the display amount is only 1%, and APC control does not work. Therefore, when the white display area is narrowed to a predetermined size (a size with which the APC control does not limit the output luminance), the output luminance can be changed from 0 to 100% (full).

  At this time, the color analyzer 20 captures a white display portion of the screen of the PDP 19, detects the luminance value of each of the RGB colors constituting the captured image, and outputs a voltage signal corresponding to the detected luminance value. Generate. The PC 40 acquires a voltage signal corresponding to this luminance value via the cable C3, and temporarily stores it as initial luminance in the RAM 40c (S112).

  The temperature sensor 30 also measures the temperature of the white display area in the screen of the PDP 19, and generates a voltage signal corresponding to the measured temperature. The PC 40 acquires a voltage signal corresponding to this temperature via the cable C4 almost simultaneously with acquiring the voltage signal corresponding to the luminance value from the color analyzer 20, and temporarily stores it as temperature information in the RAM 40c (S114).

  The APL of the PC 40 holds the luminance change characteristic (corresponding to the characteristic of FIG. 10) associated with the temperature change of the PDP 19 as data or an algorithm in the program, and the initial luminance acquired in S112 based on the luminance change characteristic accompanying the temperature change. Correct. For example, if the temperature measured by the temperature sensor 30 is T1, the luminance (initial luminance) captured by the color analyzer is B, and the output luminance at T1 is X% of the maximum luminance as a characteristic of the PDP 19, the corrected luminance B ′ Is obtained by B ′ = B × 100 / X. In the PDP phosphor, since the luminance change characteristic with temperature change is different for each color, the correction of luminance is also different for each color.

  Of course, it is not always necessary to correct the maximum luminance of the PDP 19, and for example, a configuration may be adopted in which the output luminance is corrected to a temperature at which the temperature of the PDP 19 is stable in a general viewing environment. In addition, since the temperature change of the PDP 19 has a correlation with the passage of time, the temperature change may be estimated based on the elapsed time and corrected. By correcting the luminance according to the temperature change in this way, it is possible to adjust the white balance more accurately. In particular, as shown in FIG. 10, since the temperature change (that is, the luminance change) immediately after the power is turned on is large, there is a possibility that the output luminance changes between the measurement at the luminance of 23% and the measurement at the luminance of 70%. Therefore, it is possible to reduce the influence of such a change in the adjustment environment.

  The PC 40 holds the luminance value (target value) of each RGB color when the white balance is adjusted as data or an algorithm in the program, and compares the corrected luminance with the target value, and the difference is a predetermined allowable value. It is determined whether it is within the range (S118). If this difference is within the allowable range, the condition is established and the process proceeds to S122. If the difference is outside the allowable range, the condition is not established and the process proceeds to S120.

  In step S122, the PC 40 changes the white balance adjustment value so that the corrected luminance falls within the allowable range of the target value. Then, the changed adjustment value is output as a new white balance adjustment value to the memory 12e via the cable C1 and the IIC bus 16 (S120). The memory 12e stores the output adjustment value as a new white balance adjustment value (S216). Then, the PC 40 repeats the processing from S110.

  When the condition is satisfied in S118 and the process proceeds to S122, the PC 40 outputs a video signal of a white video with a display luminance of 70% of the maximum luminance from the video signal output terminal (S122). Then, a video signal is input to the video signal input terminal 18 of the PDP display device 10, and a video corresponding to the input video signal is displayed on the PDP 19 (S218). The white display video signal output by the PC 40 in S218 is the same as in S110.

  The color analyzer 20 captures a white display area in the screen of the PDP 19, detects the luminance value of each of RGB colors constituting the captured image, and generates a voltage signal corresponding to the detected luminance value. The PC 40 acquires a voltage signal corresponding to this luminance value via the cable C3, and temporarily stores it as initial luminance in the RAM 40c (S124).

  The temperature sensor 30 also measures the temperature of the white display area in the screen of the PDP 19, and generates a voltage signal corresponding to the measured temperature. The PC 40 acquires a voltage signal corresponding to this temperature via the cable C4 almost simultaneously with acquiring the voltage signal corresponding to the luminance value from the color analyzer 20, and temporarily stores it as temperature information in the RAM 40c (S126).

  The APL of the PC 40 holds the luminance change characteristic (corresponding to the characteristic of FIG. 10) associated with the temperature change of the PDP 19 as data or an algorithm in the program, and the initial luminance acquired in S124 based on the luminance change characteristic accompanying the temperature change. Correct. This correction is the same as S116.

  The PC 40 holds the luminance value (target value) of each RGB color when the white balance is adjusted as data or an algorithm in the program, and compares the corrected luminance with the target value, and the difference is a predetermined allowable value. It is determined whether it is within the range (S130). If this difference is within the allowable range, the condition is satisfied and the process proceeds to S134, and if the difference is outside the allowable range, the condition is not satisfied and the process proceeds to S132.

  In step S132, the PC 40 changes and generates the white balance adjustment value so that the corrected luminance is within the allowable range of the target value. Then, the changed adjustment value is output as a new white balance adjustment value to the memory 12e via the cable C1 and the IIC bus 16 (S132). The memory 12e stores the output adjustment value as a new white balance adjustment value (S222). Then, the PC 40 repeats the process from S122.

  When the condition is satisfied in S130 and the process proceeds to S134, the PC 40 sets the white balance adjustment value of the entire luminance area based on the white balance adjustment values at 23% luminance and 70% luminance of the white balance that satisfy the conditions in S118 and S130. The generated adjustment value is output to the semiconductor memory 15 via the cable C1 and the IIC bus 16 (S134). Then, the semiconductor memory 15 stores the input adjustment value (S224).

When S134 ends, the processing of the PC 40 ends. When the operator performs a predetermined operation on the PDP display device 10, the white balance adjustment processing on the PDP display device 10 side is also ended.

  As described above, the PC 40 that executes S110 and S122 constitutes a white video input means for inputting a video signal to be displayed in white in a predetermined area that is a part of the screen of the PDP display device, and executes S112 and S124. The PC 40 configures luminance acquisition means for capturing a predetermined area displayed in white and acquires the luminance of each color component constituting the captured image, and the PC 40 executing S134 includes the color component that configures the captured image. The adjustment value setting means for outputting the adjustment value changed so that the luminance ratio becomes a predetermined ratio is configured, and the PC 40 executing S114 and S116, and S126 and S128 acquires the temperature information of the predetermined region to obtain the temperature. PC4 which constitutes a luminance fluctuation calculating means for calculating the luminance fluctuation amount based on the information and executes S118 and S120, and S130 and S132 But it constitutes a luminance correction means for correcting, based on the luminance variation of the luminance of luminance obtaining unit has obtained.

The operation of the present embodiment having the above configuration will be described below.
The PDP display device 10 is placed on a conveyor or the like and flows in front of the operator at a predetermined interval. Then, the operator connects the PDP display device 10 and the PC 40 with the cables C1 and C2, and the color analyzer 20 and the temperature sensor 30 are set so that the white display area can be imaged and measured. Then, the operator turns on the power of the PDP display device 10 and performs a predetermined operation to shift the PDP display device 10 to the adjustment mode. Next, when the APL for white balance adjustment of the PC 40 is executed, the white balance adjustment process is started.

  First, in the approximate center of the screen of the PDP display device 10, white display is performed at a luminance of 23% with a size of about 1% of the screen size. Then, the color analyzer 20 measures the luminance of each color of RGB in the white display area, and at the same time, the temperature sensor 30 measures the temperature of the white display area. The luminance acquired from the color analyzer 20 is corrected based on the temperature information acquired from the temperature sensor 30. Then, imaging, temperature measurement, and correction are repeated while changing the adjustment value of the memory 12e until the corrected white balance is obtained.

  When the white balance adjustment at the luminance of 23% is completed, the white display is performed at the luminance of 70%. The area size is the same as in the case of 23% luminance. Similarly to the case of the luminance of 23%, the adjustment value setting for the memory 12e based on the imaging, the temperature measurement, and the correction is repeated to obtain the white balance at the luminance of 70%.

  Then, the white balance adjustment value of the entire luminance region is generated by the two-point tracking method from the adjustment value of each color having a luminance of 23% and the adjustment value of each color having a luminance of 70%, and the generated adjustment value is stored in the semiconductor memory 15. Set.

  When the adjustment value setting for the semiconductor memory 15 is completed, the operator performs a predetermined operation on the PDP display device 10 to end the adjustment mode, and removes the cables C1 and C2 from the PDP display device 10.

(3) Modified example of white balance adjustment processing:
A plurality of the white display areas described above may be formed as shown in FIG. Hereinafter, with reference to the flowchart of FIG. 7, a white balance adjustment process as a modification when a plurality of white display areas are set in the PDP 19 will be described. 7 is different in that S310 to S312 are added between S130 and S134 of the white balance adjustment process described above. Accordingly, the other steps are denoted by the same reference numerals, and the description of the steps for performing the same processing is omitted.

  In this modification, if the condition is satisfied in S130, the process proceeds to S310. In S310, it is determined whether or not the imaging at 23% luminance and 70% luminance, temperature measurement, and white balance adjustment have been completed in all white display areas. That is, in this modification, a white display area A is set at the approximate center of the screen, a white display area B is displayed at the upper left of the screen, a white display area C is displayed at the lower left of the screen, a white display area D is displayed at the lower right of the screen, and a white display is displayed at the upper right of the screen. Each region E is set, and for each of the white display regions A to E, imaging at 23% luminance and 70% luminance, temperature measurement, and white balance adjustment are performed. If the imaging, temperature measurement, and white balance adjustment at 23% luminance and 70% luminance have been completed for all of the white display areas A to E, the process proceeds to S312 if the conditions are satisfied, and if not, the color analyzer 20 and the temperature sensor are processed. 30 is set so that the unmeasured white display area can be measured, and the processing from S110 is repeated.

  In S312, based on the adjustment values of the white display areas A to E (hereinafter referred to as adjustment values A to E) set in the memory 12e when the conditions are satisfied in S118 and S130, the semiconductor memory 15 Determine the adjustment value to be set. Specifically, a configuration in which an average value of the adjustment values A to E is calculated and this average value is adopted as the final adjustment value is conceivable. Moreover, since it is preferable that the brightness at the center of the screen is higher for a television receiver, an adjustment value that increases the brightness at the center of the screen may be employed.

  In S 134, a white balance adjustment value for the entire luminance region is generated based on the adjustment value determined in S 312, and the generated adjustment value is output to the semiconductor memory 15 via the cable C 1 and the IIC bus 16.

  As described above, when the final adjustment value is determined based on the adjustment values acquired from the plurality of white display areas, the overall white balance adjustment that is not affected by the characteristics of the specific area of the PDP 19 can be performed.

(4) Summary:
That is, the PC 40 displays a white display area having a size of 1% of the entire screen at the approximate center of the screen of the PDP display device 10, and the white display area is imaged by the color analyzer 20 to form a captured image. The luminance of each RGB color component to be acquired is acquired, and the temperature information is acquired by causing the temperature sensor 30 to measure the temperature of the white display area, and the luminance of each RGB color component is corrected based on this temperature information. An adjustment value changed so that the luminance ratio of each of the color components becomes a ratio indicating a predetermined white is set in the semiconductor memory 15.

Needless to say, the present invention is not limited to the above embodiments. It goes without saying for those skilled in the art,
・ Applying mutually interchangeable members and configurations disclosed in the above embodiments by appropriately changing the combination thereof.− Although not disclosed in the above embodiments, it is a publicly known technique and the above embodiments. The members and configurations that can be mutually replaced with the members and configurations disclosed in the above are appropriately replaced, and the combination is changed and applied. It is an embodiment of the present invention that a person skilled in the art can appropriately replace the members and configurations that can be assumed as substitutes for the members and configurations disclosed in the above-described embodiments, and change the combinations and apply them. It is disclosed as.

1 is a system configuration diagram showing a schematic configuration of a white balance adjustment system 100 of a PDP display device. 2 is a block diagram illustrating a configuration of a color analyzer 20. FIG. 2 is a block diagram showing a configuration of a PDP display device 10. FIG. It is a block diagram which shows the structure of PC40. It is the flowchart which showed the process of the PDP display apparatus and the process of PC40. It is an example of the image | video displayed on PDP19 by the video signal of a white image | video. It is a flowchart which shows the modification of a white balance adjustment process. It is an example of the screen in which the white display was formed in multiple places. In this example, APC is performed so that the luminance is reduced to about 15% of the maximum luminance at the maximum display amount. It is a graph which shows the brightness | luminance vs temperature characteristic of PDP.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... PDP display device, 11 ... RGB signal generation circuit, 12 ... RGB signal processing circuit, 12a ... Pixel number conversion circuit, 12b ... Image quality adjustment circuit, 12c ... γ correction circuit, 12d ... Brightness / contrast adjustment circuit, 12e ... Memory , 13 ... Sync separator circuit, 14 ... Microcomputer, 15 ... Semiconductor memory, 16 ... IIC bus, 16a ... IIC bus data port, 17 ... Drive circuit, 17a ... Control circuit, 17b ... Pixel data generation circuit, 17c ... Row electrode drive Circuit 18, video signal input terminal 20 color analyzer 20 a system bus 21 CCD image sensor 22 a controller 22 b lens control system 23 a microcomputer 23 b A / D conversion circuit 23 c II / F, 30 ... temperature sensor, 30a ... element, 40 ... PC (adjustment computer), 40a ... CPU, 40 Display driver 40e Hard disk drive 40f Input I / F 40g I / O port 40h Communication port 40i Video signal output terminal 40j I / O board 40k Bus 40f1 Keyboard 40f2 ... mouse, 100 ... white balance adjustment system, C1 ... cable, C2 ... cable, C3 ... cable, C4 ... cable

Claims (10)

An adjustment value for adjusting the white balance with respect to the input video signal is stored in a nonvolatile semiconductor memory, the white balance adjustment is performed on the video signal with reference to the adjustment value, and the APC control is performed. A PDP display device that displays a white balance adjusted image on a predetermined screen;
An adjustment device for setting the adjustment value in the PDP display device;
In a white balance adjustment system of a PDP display device comprising:
The adjustment device includes a color analyzer that captures an image of the screen of the PDP display device and generates luminance information of each color of RGB, a temperature sensor that measures temperature of the screen of the PDP display device and generates temperature information, and the luminance A processing unit that generates a white balance adjustment value based on the information and the temperature information, and sets the white balance adjustment value in the PDP display device,
The processing unit inputs, to the PDP display device, a video signal to be displayed in white in a predetermined region that is a part of the screen of the PDP display device, and the predetermined region displayed in white on the screen of the PDP display device is input to the color analyzer. The color analyzer acquires brightness information of each color component constituting the captured image, acquires temperature information of the predetermined area from the temperature sensor, calculates a luminance fluctuation amount based on the temperature information, and the color analyzer The luminance information acquired from the above is corrected based on the amount of luminance variation, and the adjustment value changed so that the luminance ratio of the color components constituting the captured image becomes a predetermined ratio is set in the semiconductor memory,
The white balance adjustment system, wherein the predetermined area has a size that the APC control does not limit the output luminance in the white balance adjustment. An adjustment value for adjusting the white balance with respect to the input video signal is stored in a nonvolatile semiconductor memory, the white balance adjustment is performed on the video signal with reference to the adjustment value, and the APC control is performed. A PDP display device that displays a white balance adjusted image on a predetermined screen;
An adjustment device for setting the adjustment value in the PDP display device;
In a white balance adjustment system of a PDP display device comprising:
The adjusting device includes: a white video input unit that inputs a video signal to be white-displayed in a predetermined area that is a part of the screen of the PDP display device to the PDP display device; Luminance acquisition means for acquiring luminance information of each color component constituting the captured video, and an adjustment value changed so that the luminance ratio of the color component constituting the captured video becomes a predetermined ratio is set in the semiconductor memory A white balance adjustment system comprising an adjustment value setting means. Brightness fluctuation calculating means for acquiring temperature information of the predetermined area and calculating a brightness fluctuation amount based on the temperature information;
Brightness correction means for correcting the brightness information acquired by the brightness acquisition means based on the brightness fluctuation amount;
3. The white balance adjustment according to claim 2, wherein the adjustment value setting means sets an adjustment value that is changed so that the luminance ratio of the color component corrected by the luminance correction means becomes a predetermined ratio. system. An adjustment value for adjusting the white balance with respect to the input video signal is stored in a nonvolatile semiconductor memory, the white balance adjustment is performed on the video signal with reference to the adjustment value, and the white balance adjustment is performed. A PDP display device for displaying the recorded video on a predetermined screen;
An adjustment device for setting the adjustment value in the PDP display device;
In a white balance adjustment system of a PDP display device comprising:
The adjusting device includes: white video input means for inputting a video signal to be displayed in white on the screen of the PDP display device to the PDP display device; and luminance information of each color component constituting the captured image by imaging the screen. A luminance acquisition means for acquiring, a luminance fluctuation calculating means for acquiring the temperature information of the screen and calculating a luminance fluctuation amount based on the temperature information; and the luminance information acquired by the luminance acquisition means based on the luminance fluctuation amount. And a correction value setting unit that sets an adjustment value, which is changed so that the luminance ratio of the color component corrected by the luminance correction unit becomes a predetermined ratio, in the semiconductor memory. White balance adjustment system.   The white balance adjustment system according to any one of claims 2 to 4, wherein the predetermined area has a size that the APC control does not limit output luminance in the white balance adjustment. A plurality of the predetermined areas are set on a predetermined screen of the PDP display device,
The white balance adjustment system according to any one of claims 2 to 5, wherein the white video input means inputs a video signal to be white-displayed in order in each predetermined area to the PDP display device. .   The white balance adjustment system according to claim 6, wherein the adjustment value setting unit changes the adjustment value based on an average of data acquired from the plurality of predetermined areas.   The said adjustment value setting means changes the said adjustment value so that the brightness | luminance of the screen center of the said PDP display apparatus may become the maximum brightness | luminance based on the data acquired from the said several predetermined area | region. The white balance adjustment system described in 1. An adjustment value for adjusting the white balance with respect to the input video signal is stored in a nonvolatile semiconductor memory, the white balance adjustment is performed on the video signal with reference to the adjustment value, and the APC control is performed. For a PDP display device that displays a white balance adjusted image on a predetermined screen,
In the white balance adjustment method in which the adjustment device performs white balance adjustment,
A white display step of displaying white in a predetermined area which is a part of the screen of the PDP display device;
A luminance acquisition step of imaging the predetermined area displayed in white and acquiring luminance information of each color component constituting the captured image;
A white balance adjustment method comprising: an adjustment value output step of setting an adjustment value, which has been changed so that a luminance ratio of color components constituting the captured image becomes a predetermined ratio, in the semiconductor memory. An adjustment value for adjusting the white balance with respect to the input video signal is stored in a nonvolatile semiconductor memory, the white balance adjustment is performed on the video signal with reference to the adjustment value, and the APC control is performed. In a PDP display device for displaying a video with white balance adjustment on a predetermined screen,
White video display means for displaying white in a predetermined area which is a part of the screen;
Luminance acquisition means for capturing the predetermined area displayed in white and acquiring luminance information of each color component constituting the captured image;
A PDP display device comprising: adjustment value setting means for setting an adjustment value, which is changed so that a luminance ratio of color components constituting the captured image becomes a predetermined ratio, in the semiconductor memory.