JP3829859B2 - INPUT / OUTPUT CHARACTERISTICS MEASURING METHOD, INPUT / OUTPUT CHARACTERISTIC MEASURING DEVICE, DISPLAY IMAGE QUALITY ADJUSTING METHOD, AND IMAGE QUALITY ADJUSTING DEVICE - Google Patents

Description

  The present invention provides input / output characteristics of various displays such as liquid crystal panels (light valves), PDP panels, EL panels, etc. in displays such as personal computers (PCs), word processors, television receivers, and various display devices used as projectors. The present invention relates to an input / output characteristic measuring method and an input / output characteristic measuring apparatus to be measured, and an image quality adjusting method and an image quality adjusting apparatus for a display device.

  The transmission characteristic (VT characteristic) of a liquid crystal panel used for a three-plate liquid crystal projector or the like is a non-linear S-shaped curve. Since the characteristics vary among liquid crystal panels, they are measured for each panel corresponding to R (red), G (green), and B (blue) using a color luminance meter or the like (for example, Patent Document 1). 2).

  Specifically, the drive signal level (voltage) input to each panel was changed from 0 to 100%, and the transmittance of the liquid crystal panel at that time was measured. For example, when the driving signal to the liquid crystal panel is 10 bits and can be changed from 0 to 1023, the driving signal is changed for each of “0, 32, 64... 1023” and “32” to measure 33 points. It was measured by number.

Based on the measurement result, a lookup table (LUT) for gamma correction for each liquid crystal panel is created, and the LUT is written in the memory of the display device in which the liquid crystal panel is incorporated.
Therefore, each display device can perform a display that faithfully reproduces the original image by performing correction according to the characteristics of the liquid crystal panel using the written LUT.

Japanese Patent Laid-Open No. 5-19723 JP 2001-238227 A

  However, conventionally, there has been a problem that the measurement efficiency is not good because the drive signal level of the liquid crystal panel is changed at equal intervals. That is, as shown in the VT characteristic diagram of FIG. 12, since the transmittance T is not proportional to the drive signal level, the transmittance hardly changes (for example, the region where the drive signal is 0 to 384, 896 to 1023), and the transmission. There are areas where the rate changes significantly. Therefore, if the drive signal level for driving the liquid crystal panel is changed at equal intervals, the measurement points in the region where the transmittance hardly changes, that is, useless measurement points that are not very useful for measuring the transmission characteristics, increase the measurement of the transmission characteristics. There is a problem that the number of measurement points required is small.

  For this reason, if the number of measurement points is increased in order to improve the measurement accuracy of the transmission characteristics, that is, the accuracy of the LUT, there is a problem that the measurement time and image quality adjustment time of one liquid crystal panel become longer and the measurement efficiency is lowered. . On the other hand, if the number of measurement points is reduced in order to shorten the measurement time, there is a problem that the measurement accuracy of the transmission characteristics is lowered and the accuracy of the LUT, that is, the image quality adjustment accuracy is lowered.

  Such a problem is not a problem specific to a liquid crystal projector, but also occurs in a liquid crystal display using a liquid crystal panel and a liquid crystal projection television. Furthermore, there is a variation in the relationship between the input signal and the output signal (output light) for each display body (display panel) such as a plasma display (PDP) or an organic EL display, and it is necessary to measure input / output characteristics for each display panel. This problem also occurs in some display devices.

  An object of the present invention is to provide a method and apparatus for measuring input / output characteristics of a display that can improve the measurement efficiency of input / output characteristics of the display, and an image quality adjustment method and image quality adjustment of a display that can improve the image quality adjustment accuracy of the display. To provide an apparatus.

The method for measuring input / output characteristics of a display body according to the present invention includes a drive signal setting step for sequentially switching and setting a signal level of a drive signal input to a display body for displaying an image, and a signal level is set in the drive signal setting step. The output signal is sequentially input to the display body, and an output image measurement step for measuring at least the luminance value of the output image displayed on the display body, and the display body based on the data measured in the output image measurement step An input / output characteristic calculation step for obtaining an output characteristic of an output image with respect to an input drive signal, and the drive signal setting step includes a case where a gamma value for gamma correction set in a display device having a display body is γ The signal level of each drive signal is set so that the luminance value of the output image of the display body when each drive signal is input is raised to an exponent of 1 / γ is substantially equidistant.
Here, in the present invention and each invention described below, a “display body” is a panel body that displays an image on a display device, and corresponds to a liquid crystal panel in a liquid crystal display or a liquid crystal projector, and a PDP panel in a plasma television. In an organic EL display, an organic EL panel corresponds.
Further, the luminance value of the output image is, for example, luminance information of the image represented by the Y value of the tristimulus value, and corresponds to the transmittance if the display body is a liquid crystal panel.

In the present invention, in the output image measurement step, predetermined drive signals are sequentially input to a display body such as a liquid crystal panel, and chromaticity and luminance data of an image displayed on the display body are measured with a chromaticity luminance meter. As a result, at each measurement point, the input / output characteristics that are the relationship between the drive signal level applied to the display body and the luminance value of the display body (corresponding to the transmittance when the display body is a liquid crystal panel) can be measured. In the output characteristic calculation step, input / output characteristics including portions other than the measurement points can be calculated based on these measurement data.
Further, in the present invention, when the gamma value for gamma correction set in the display device is γ in the drive signal setting step for setting the level of the drive signal input to the display body, when each drive signal is input The level of each drive signal is set so that the values obtained by raising the luminance value of the output image of the display body to the power of exponent 1 / γ are substantially equally spaced.
A value obtained by raising the luminance value to an exponent of 1 / γ corresponds to an input value for gamma correction, that is, an input signal input to the display device. Therefore, in the present invention, the luminance value and transmittance for the input signal set at substantially equal intervals are measured in the level range that can be input to the display device. Therefore, since the optimum measurement point can be selected when measuring the input / output characteristics, it is possible to create an LUT as compared with the case where the display output characteristics are measured with the drive signal input to the display body at equal intervals. The number of necessary measurement points can be reduced, the measurement time can be shortened, and the measurement efficiency can be improved. Further, when the number of measurement points is the same, the accuracy of the input / output characteristic data can be made higher.

In the present invention, the gamma value γ is preferably 2.2. If the gamma value γ is 2.2, the display characteristics are the same as the display characteristics of the CRT. Therefore, a display device suitable for displaying general video / image data based on the output of the CRT can be obtained. .
Depending on the type of video or the like, the gamma value may be 1.8 or the like, so the gamma value is not limited to 2 and 2, and may be set according to the type of data displayed on the display device. .

  In the present invention, the driving signal setting step includes a first setting step for setting a minimum value V1, a median value V2, and a maximum value V3 in the signal level of the driving signal input to the display body, and the first setting step. The luminance values T1, T2, and T3 measured in the output image measurement process when the drive signals are input are raised to the exponent 1 / γ to obtain the calculated values D1, D2, and D3. Among these, the division between the smallest data D1 and the next smallest data D2 is a divided area d1, and the area between the largest data D3 and the next largest data D2 is a divided area d2. In the approximate lines connecting the points 1 to 3 composed of the brightness values T1 to T3, the value Dm located in the middle of the maximum area among the divided areas corresponds to the brightness value Tm obtained by raising the exponent γ. Drive signal level A second setting step of setting the next drive signal level of the next drive signal to be input to the display body, and the luminance value measured in the output image measurement step when the drive signal set to the next drive signal level is input The calculated value Di is obtained by raising Ti to the exponent 1 / γ, and among the calculated values that have already been calculated, the calculated value Dx that is smaller than the calculated value Di and closest to the calculated value Di, and the calculated value Di The divided area dxy between the calculated value Di and the calculated value Di that is the largest and closest to the calculated value Di is divided into the two divided areas dx and dy, and each of the drive signal levels and the luminance value at that time are formed. Next, the drive signal level corresponding to the luminance value Tm obtained by raising the value Dm located in the middle of the maximum area among the divided areas to the power of the exponent γ in the approximate line connecting the points is input to the display body. Next drive signal of drive signal And a third setting step of setting the level, after performing the third setting step from the first setting step, be up to measure the number of data required to obtain repeating it said third setting step preferably.

  If the drive signal is set in such a procedure, the signal level of the drive signal is set based on the intermediate value of the maximum area among the divided areas divided based on the measurement data. The input level can be set without performing a complicated calculation process. Moreover, since the maximum area is set based on actual measurement data, an appropriate input level can be set even if the characteristics of the display body are unknown.

The method for measuring input / output characteristics of a display body according to the present invention includes a drive signal setting step for sequentially switching and setting a signal level of a drive signal input to a display body for displaying an image, and a signal level is set in the drive signal setting step. The output signal is sequentially input to the display body, and an output image measurement step for measuring at least the luminance value of the output image displayed on the display body, and the display body based on the data measured in the output image measurement step An input / output characteristic calculation step for obtaining an output characteristic of an output image with respect to an input drive signal, and the drive signal setting step has a lightness index of the output image of the display body when each drive signal is input at substantially equal intervals. As described above, the signal level of each drive signal is set. Here, the lightness index means an L ^* value in the L ^* a ^* b ^* color system or the L ^* u ^* v ^* color system.

  The drive signal level of the display body is changed from the minimum value to the maximum value by setting the level of the drive signal of the display body so that the lightness index of the output image of the display body when the drive signal is input is set at almost equal intervals. In the range, it is possible to set a drive signal that changes the luminance (transmittance) of the display body at substantially equal intervals. For this reason, a substantially uniform measurement point can be set over the entire luminance change range of the display body, and an optimal measurement point can be selected when measuring the display output characteristics. For this reason, the number of measurement points required to create the LUT can be reduced and the measurement time can be shortened compared with the case where the display output characteristics are measured at equal intervals of the drive signal input to the display body. Measurement efficiency can be improved. Further, when the number of measurement points is the same, the accuracy of the input / output characteristic data can be made higher.

  In the present invention, the driving signal setting step includes a first setting step for setting a minimum value V1, a median value V2, and a maximum value V3 in the signal level of the driving signal input to the display body, and the first setting step. The brightness indexes D1, D2, and D3 are obtained based on the brightness values T1, T2, and T3 measured in the output image measurement process when each of the drive signals is input, and the smallest data D1 among the brightness indexes is obtained. The divided area d1 is between the next smallest data D2 and the divided area d2 is between the largest data D3 and the next largest data D2, and each of the drive signal levels V1 to V3 and the luminance values T1 to T3 at that time. Next, the driving signal level corresponding to the luminance value Tm corresponding to the brightness index Dm located in the middle of the maximum area among the divided areas is input to the display body on the approximate lines connecting the points 1 to 3 respectively. A lightness index Di based on the luminance value Ti measured in the output image measurement step when the drive signal set at the next drive signal level and the drive signal set at the next drive signal level are input. Among the already calculated brightness indexes, the brightness index Dx smaller than the brightness index Di and closest to the brightness index Di, and the brightness index Dy larger than the brightness index Di and closest to the brightness index Di The divided area dxy is divided by the lightness index Di into two divided areas dx and dy, and each of the divided areas is represented by an approximate line connecting the respective points of the drive signal levels and the luminance values at that time. A driving signal level corresponding to the luminance value Tm corresponding to the lightness index Dm located in the middle of the maximum area is set to the next driving signal level of the driving signal next input to the display body. It is preferable that the third setting step is repeated until a necessary number of measurement data is obtained after performing the third setting step from the first setting step.

  If the drive signal is set in such a procedure, the signal level of the drive signal is set based on the intermediate value of the maximum area among the divided areas divided based on the measurement data. The input level can be set without performing a complicated calculation process. Moreover, since the maximum area is set based on actual measurement data, an appropriate input level can be set even if the characteristics of the display body are unknown.

Here, it is preferable that the approximate line is a straight line passing through the two points, and the next input signal level is set as a horizontal axis value when a vertical axis value is a luminance value Tm in the approximate line. .
Thus, if the approximate line is a straight line, the approximate line can be easily set, and the next drive signal level can be easily set from the intersection of the approximate line and the luminance value Tm.
If the display output characteristics of the display bodies are likely to be similar, such as when inspecting and adjusting liquid crystal panels of the same product, the approximate line is based on the display output characteristics of the measured display bodies. May be set. Since the display output characteristic of the display body is usually a non-linear S-curve, the next drive signal level can be closer to the actual measured value when the approximate line is an approximate curve than when the approximate line is used. it can.

  An input / output characteristic measuring apparatus for a display body according to the present invention includes a drive signal setting means for sequentially switching and setting a signal level of a drive signal input to a display body for displaying an image, and a signal level set by the drive signal setting means. Output signals are sequentially input to the display body, output image measurement means for measuring at least the luminance value of the output image displayed on the display body, and the display body based on the data measured by the output image measurement means Input / output characteristic calculating means for obtaining output characteristics of an output image with respect to an input drive signal, wherein the drive signal setting means is set to γ as a gamma value for gamma correction set in a display device having a display body The signal level of each drive signal is set so that the luminance value of the output image of the display body when each drive signal is input is raised to an exponent of 1 / γ is substantially equidistant.

  Also in the input / output characteristic measuring apparatus of the present invention, the same effects as the input / output characteristic measuring method described in claim 1 can be obtained.

  An input / output characteristic measuring apparatus for a display body according to the present invention includes a drive signal setting means for sequentially switching and setting a signal level of a drive signal input to a display body for displaying an image, and a signal level set by the drive signal setting means. Output signals are sequentially input to the display body, output image measurement means for measuring at least the luminance value of the output image displayed on the display body, and the display body based on the data measured by the output image measurement means Input / output characteristic measuring means for obtaining an output characteristic of an output image with respect to an input drive signal, wherein the drive signal setting means has a lightness index of the output image of the display body when the respective drive signals are input at substantially equal intervals. As described above, the signal level of each drive signal is set.

  Also in the input / output characteristic measuring apparatus of the present invention, the same effects as the input / output characteristic measuring method described in claim 4 can be obtained.

  According to the image quality adjusting method of the display device of the present invention, the signal level of the driving signal is set in the driving signal setting step and the driving signal setting step in which the signal level of the driving signal input to the display body for displaying the image is sequentially switched and set. The drive signal is sequentially input to the display body, and an output image measurement step for measuring at least the luminance value of the output image displayed on the display body, and the data measured in the output image measurement step are input to the display body. An input / output characteristic calculating step for obtaining an output characteristic of an output image with respect to a driving signal, a lookup table in which a relationship between an input signal input to a display device having a display body and a driving signal input to the display body is recorded An image quality adjustment step that is created and incorporated in the display device. The drive signal setting step inputs each drive signal when the gamma correction gamma value set in the display device is γ. The signal level of each drive signal is set so that the value obtained by raising the luminance value of the output image of the display body to the power of exponent 1 / γ is substantially equidistant, and the image quality adjusting step calculates the input / output characteristics. The look-up table is created based on output characteristic data for the display driving signal obtained in the process and the gamma correction data.

Here, the look-up table stores a one-to-one relationship between an input signal to the display device and a drive signal input to the display body when the input signal is input.
Note that, for example, when a display device has a plurality of display bodies (liquid crystal panels or the like) such as a three-plate liquid crystal projector, a lookup table is created for each display body.

  In the present invention, similarly to the input / output characteristic measuring method, when measuring the display output characteristic, the luminance value of the output image of the display body when each drive signal is input is raised to an exponent of 1 / γ. Since the level of each drive signal is set so that the obtained values are substantially equidistant, the luminance value and the transmittance with respect to the input signal set substantially equidistant are measured in the level range that can be input to the display device. It is possible to select an optimum measurement point when measuring the display output characteristics. For this reason, the number of measurement points required to create the LUT can be reduced and the measurement time can be shortened compared with the case where the display output characteristics are measured at equal intervals of the drive signal input to the display body. Measurement efficiency can be improved. Further, when the number of measurement points is the same, the accuracy of the input / output characteristic data can be made higher, and as a result, the image quality can be adjusted with higher accuracy.

  According to the image quality adjusting method of the display device of the present invention, the signal level of the driving signal is set in the driving signal setting step and the driving signal setting step in which the signal level of the driving signal input to the display body for displaying the image is sequentially switched and set. The drive signal is sequentially input to the display body, and an output image measurement step for measuring at least the luminance value of the output image displayed on the display body, and the data measured in the output image measurement step are input to the display body. An input / output characteristic calculating step for obtaining an output characteristic of an output image with respect to a driving signal, a lookup table in which a relationship between an input signal input to a display device having a display body and a driving signal input to the display body is recorded An image quality adjustment step that is created and incorporated in the display device, and the drive signal setting step is such that the brightness index of the output image of the display body when the respective drive signals are input is substantially equidistant. The signal level of each drive signal is set, and the image quality adjustment step is based on output characteristic data for the display body drive signal obtained in the input / output characteristic calculation step and gamma correction data set in the display device. The lookup table is created.

In the present invention, as in the input / output characteristic measurement method, when measuring the display output characteristic, the level of each drive signal is set so that the lightness index L ^* is substantially equally spaced. In the level range that can be input to the display device, it is possible to measure the luminance value and the transmittance with respect to the input signal set at substantially equal intervals, and it is possible to select the optimum measurement point when measuring the display output characteristics. For this reason, the number of measurement points required to create the LUT can be reduced and the measurement time can be shortened compared with the case where the display output characteristics are measured at equal intervals of the drive signal input to the display body. Measurement efficiency can be improved. Further, when the number of measurement points is the same, the accuracy of the input / output characteristic data can be made higher, and as a result, the image quality can be adjusted with higher accuracy.

  In the image quality adjusting apparatus for a display device according to the present invention, a drive signal setting unit that sequentially switches and sets a signal level of a drive signal input to a display body that displays an image, and the signal level is set by the drive signal setting unit. The drive signal is sequentially input to the display body, the output image measuring means for measuring at least the luminance value of the output image displayed on the display body, and the input to the display body based on the data measured by the output image measuring means. An input / output characteristic calculating means for obtaining an output characteristic of an output image with respect to a driving signal, a lookup table that records a relationship between an input signal input to a display device having a display body and a driving signal input to the display body An image quality adjusting unit that is created and incorporated in the display device, and the drive signal setting unit inputs each drive signal when the gamma value for gamma correction set in the display device is γ. The signal level of each drive signal is set so that the luminance value of the output image of the display body at the time of power generation by an exponent 1 / γ is substantially equidistant, and the image quality adjustment means calculates the input / output characteristics The look-up table is created on the basis of output characteristic data for the display body drive signal obtained by the means and the gamma correction data.

  In the present invention as described above, the same effects as the image quality adjustment method according to the ninth aspect can be obtained.

  In the image quality adjusting apparatus for a display device according to the present invention, a drive signal setting unit that sequentially switches and sets a signal level of a drive signal input to a display body that displays an image, and the signal level is set by the drive signal setting unit. The drive signal is sequentially input to the display body, the output image measuring means for measuring at least the luminance value of the output image displayed on the display body, and the input to the display body based on the data measured by the output image measuring means. An input / output characteristic calculating means for obtaining an output characteristic of an output image with respect to a driving signal, a lookup table that records a relationship between an input signal input to a display device having a display body and a driving signal input to the display body An image quality adjusting unit that is created and incorporated in the display device, and the drive signal setting unit is configured so that the brightness index of the output image of the display body when the respective drive signals are input is substantially equidistant. The signal level of each drive signal is set, and the image quality adjustment means is based on output characteristic data for the display body drive signal obtained by the input / output characteristic calculation means and gamma correction data set in the display device. The lookup table is created.

  In the present invention as described above, the same effects as the image quality adjustment method according to the tenth aspect can be achieved.

[First Embodiment]
As shown in FIG. 1, the measuring apparatus according to the first embodiment of the present invention includes a color luminance meter 2 for measuring chromaticity and luminance of an image displayed on the liquid crystal projector 1 to be measured, and the display apparatus. 1 and an image quality adjusting device 3 that processes data measured by the color luminance meter 2.

In the present embodiment, the liquid crystal projector 1 is exemplified as the display device, but various display devices such as a liquid crystal display, a plasma display (PDP), and an organic EL display may be measured.
The liquid crystal projector 1 includes a liquid crystal panel 11 that is a display body that displays an image, and a drive control unit 12 that controls driving of the liquid crystal panel 11. A display body in a liquid crystal projector or a liquid crystal display is composed of a liquid crystal panel 11, but a plasma display is composed of a PDP panel, and an organic EL display is composed of an EL panel.

The drive control unit 12 includes a drive IC and the like, and applies a drive signal to the liquid crystal panel (display body) 11 and controls the signal level (drive voltage value and drive current value) of the drive signal to display the drive signal. Adjust the brightness value of the body output image.
In the present embodiment, the drive control unit 12 is set to drive the liquid crystal panel 11 using a 10-bit control signal, and the drive voltage of the liquid crystal panel 11 is changed by switching the control signal between 0 and 1023. It is configured to be controlled by switching to 1024 gradations.
Since the PDP panel and the organic EL panel are self-luminous flat panels, the luminance value of the image is directly controlled by the signal level, but the liquid crystal panel 11 functions as a light valve that adjusts the light amount of the backlight. Yes, the luminance value of the image is adjusted by controlling the light transmittance at the signal level.

The color luminance meter 2 can measure chromaticity and luminance and output the data, and since it is a general one used conventionally, description thereof is omitted.
The image quality adjustment device 3 is configured by a computer device and includes a measurement control unit 31, an image quality adjustment unit 32, and a storage unit 33.

The measurement control unit 31 includes a drive signal setting unit 311, an output image measurement unit 312, and an input / output characteristic calculation unit 313.
The drive signal setting unit 311 sets the signal level of the drive signal input to the liquid crystal panel 11 based on measurement data or the like.

  The output image measurement unit 312 inputs the drive signal set by the drive signal setting unit 311 to the liquid crystal panel 11 via the drive control unit 12, and the chromaticity and brightness of the image displayed on the liquid crystal panel 11 at that time Is measured using the color luminance meter 2.

The input / output characteristic calculation unit 313 calculates the input / output characteristic of the liquid crystal panel 11 based on the luminance value measured by the output image measurement unit 312 and the drive signal at that time, and stores the input / output characteristic in the storage unit 33. . That is, the input / output characteristic calculation unit 313 performs spline interpolation between the respective measurement data, and stores it in the storage unit 33 as the VT characteristic data 332.
Here, the input / output characteristics of the liquid crystal panel 11 are specifically VT characteristics indicating the relationship between the signal level (voltage value) of the drive signal input to the liquid crystal panel 11 and the transmittance at that time.

  The image quality adjustment unit 32 includes image quality adjustment means 321. The image quality adjusting means 321 is based on the VT characteristic data obtained by the input / output characteristic calculating means 313 and the gamma correction data set in the liquid crystal projector 1, and the input signal inputted to the liquid crystal projector 1 and the input signal thereof. A look-up table (LUT) indicating a relationship with a drive signal that is actually input to the liquid crystal panel 11 when is input, is stored in the storage unit 33 and registered in the liquid crystal projector 1.

The storage unit 33 is configured by a memory, and stores gamma correction data 331, the VT characteristic data 332, and LUT data 333.
The gamma correction data 331 stores an input signal input to the liquid crystal projector 1 and a value obtained by raising the signal value to an exponent γ (gamma value). In the present embodiment, the gamma value γ is 2.2 in order to have the same characteristics as the CRT.

[Measurement of input / output characteristics of LCD panel]
Next, a procedure for measuring the VT characteristics (transmission characteristics, the relationship of the transmittance to the input voltage) of the liquid crystal panel 11 using the image quality adjustment apparatus 3 having such a configuration will be described. In the following description, a procedure for measuring the VT characteristic in the R panel will be described, but the G panel and the B panel are also measured in the same procedure.

As shown in FIG. 2, the measurement control unit 31 of the image quality adjusting device 3 first performs a first setting process by the drive signal setting unit 311, and among the drive signals of the liquid crystal panel 11, the minimum value V <b> 1 and the median value V <b> 2. The maximum value V3 is set (step 1, the following step is abbreviated as “S”).
In the present embodiment, since a 10-bit input signal is used and the input value can be changed between 0 and 1023, the minimum value V1 = 0, the median value V2 = 512, and the maximum value V3 = 1023. Is set.

The output image measuring means 312 of the measurement control unit 31 sequentially inputs each drive signal set in the first setting step to the liquid crystal panel 11 via the drive control unit 12 and is measured by the color luminance meter 2 at that time. The transmittance based on the chromaticity of the image and the luminance value is measured, and the measured data is stored in the VT characteristic data 332 of the storage unit 33 (S2). The transmittance T1 when the minimum value V1 is input is “0”, and the transmittance T3 when the maximum value V3 is input is “1.0”. Further, the transmittance T2 of the median value V2 is obtained by the ratio of the brightness value when the median value V2 is inputted to the brightness value measured by the color luminance meter 2 when the maximum value V3 is inputted. That is, the luminance value and the transmittance of the liquid crystal panel 11 are corresponding values.
Accordingly, at least the drive signal level, chromaticity, and transmittance data are stored in the VT characteristic data 332.

  When the relationship between the drive signal and the transmittance is plotted on a graph of VT characteristics, as shown in FIG. 5, point 1 = (V1, T1), point 2 = (V2, T2), point 3 = (V3, T3) ) Three measurement points are plotted.

Next, the drive signal setting means 311 of the measurement control unit 31 performs a second setting step for setting the drive signal level to be input next time (S3).
In the second setting step, as shown in FIG. 3, transmittances (luminance values) T1 to T3 for the respective drive signals are raised to exponents 1 / γ to obtain calculated values D1, D2, and D3 (S31).
That is, the calculation is performed using the equations D1 = T1 ^{(1 / 2.2)} , D2 = T2 ^{(1 / 2.2)} , and D3 = T3 ^{(1 / 2.2)} . When T is changed from 0 to 1.0, D = T ^{(1 / 2.2)} changes from 0 to 1.0.
In the present embodiment, since D is a 10-bit input signal, it is converted to a 10-bit signal value as D = T ^{(1 / 2.2)} × 1023.

The processing for obtaining D1 to D3 from T1 to T3 is shown in a graph as shown in FIG. That is, a graph showing VT characteristics with the horizontal axis representing the drive signal level (0 to 1023) and the vertical axis representing the transmittance T (0.0 to 1.0), the horizontal axis representing the calculated value D, and the vertical axis representing the transmission. A gamma correction graph with a rate T is prepared. The gamma correction graph is represented by a curve of T = (D / 1023) ^2.2 . That is, if Y = D / 1023 is defined, T = Y ^2.2 (Y = 0 to 1.0), which is the same as the gamma correction graph which is a graph of the power of the input value (Y value) to the power of 2.2. .

Then, the drive signal level input to the liquid crystal panel 11 and the transmittance (luminance value) measured by the color luminance meter 2 and the output image measuring means 312 at that time are measured on the VT characteristic graph. Plot as.
Next, the transmittances T1 to T3 are plotted on the gamma correction graph. The horizontal axis values of these points 1 to 3 are D1 to D3.

Here, the reason why the gamma correction graph is a graph of the 2.2th power of the input value is to match the display characteristics of the liquid crystal projector 1 with the display characteristics of the CRT. Since general image / video signals are assumed to be displayed on a CRT, they have a characteristic of γ = 1 / 2.2. For this reason, the liquid crystal projector 1 normally performs gamma correction of γ = 2.2 on the input signal, and the signal level input to the liquid crystal projector 1 and the luminance (transmittance) of the image displayed on the liquid crystal panel 11. Is corrected so as to have a proportional relationship.
For this reason, in the present invention, when measuring the input / output characteristics (VT characteristics) of the liquid crystal panel 11, the input signal is subjected to gamma correction and then input to the liquid crystal panel 11 as a drive signal. The signal level of the signal is set.

Next, the difference between D1 and D2 is d1, and the difference between D2 and D3 is d2, and the magnitude relation between d1 and d2, that is, the largest area d2 among the divided areas d1 and d2 is detected (S32).
Then, as shown in FIG. 6, a value located in the middle of the maximum region (d2 in this embodiment), that is, an intermediate value Dm between D2 and D3 is obtained. In the present embodiment, Dm = D2 + d2 / 2 = about 600. Then, the transmittance Tm = Dm ^2.2 = (600/1023) ^2.2 = about 0.31 corresponding to this Dm value is obtained (S33).

Next, in the VT characteristic diagram, the drive corresponding to the transmittance (luminance value) Tm is shown in the approximate lines connecting the measurement points 1 to 3 including the drive signal levels V1 to V3 and the luminance values T1 to T3 at that time. The signal level V4 is set to the next drive signal level of the next drive signal input to the liquid crystal panel 11 (S34). Thereby, a 2nd setting process is complete | finished.
In the present embodiment, a straight line is used as the approximate line. That is, a point where the transmittance Tm and a straight line connecting the measurement points 2 and 3 in the VT characteristic diagram intersect is obtained, and the horizontal axis value V4 at that point is set as the next drive signal level. Here, the intersection between the straight line connecting the measurement points 2 and 3 and the transmittance Tm is obtained by approximating the VT characteristic between the points 2 and 3 by a linear equation, and an input which becomes the transmittance Tm in the VT characteristic diagram. An approximate value is calculated.
Therefore, in this embodiment, the approximate line is used. However, when the VT characteristic of the liquid crystal panel 11 can be grasped to some extent, the input value V4 is set at the intersection of the approximate expression (approximate curve) and the transmittance Tm. It may be calculated. For example, when the liquid crystal panels 11 having the same specifications are produced and sequentially inspected, the VT characteristics of the liquid crystal panels 11 are usually approximate. Therefore, an approximate curve is set based on the measurement data. Also good.

Next, the measurement control unit 31 operates the output image measuring unit 312 to drive the liquid crystal panel 11 with the set input value V4, and the chromaticity and transmittance (luminance value) T4 are calculated using the color luminance meter 2. The measured value is stored in the VT characteristic data 332 (S4).
In the present embodiment, T4 is about 0.22, and if plotted in the VT characteristic diagram of FIG. 6, point 4 (V4, T4) is obtained.

Next, the drive signal setting means 311 of the measurement control unit 31 performs a third setting step for setting the drive signal level to be input next time (S5).
In the third setting step, the drive signal setting unit 311 of the measurement control unit 31 obtains a calculated value Di (for example, D4) corresponding to the transmittance Ti (for example, T4) (S51). Specifically, Di = Ti ^{(1 / 2.2)} (when converting into 10-bit data, it is sufficient to multiply by 1023). If the processing for obtaining D4 is shown in a graph, a calculated value D4 corresponding to the transmittance T4 in the gamma correction graph may be obtained as shown in FIG.

  Next, among the already calculated values (for example, D1 to D3), a calculated value Dx (for example, D2) that is smaller than the calculated value Di and closest to the calculated value Di, and is larger than the calculated value Di and A divided area dxy (for example, d2) between the calculated value Dy (for example, D3) closest to the calculated value Di is divided by the calculated value Di to obtain two divided areas dx (for example, d3) and dy (for example, d4), Is formed (S52). For this reason, the area | region (0-1023) of D will be divided | segmented into d1, d3, d4, for example.

A point corresponding to the middle (1/2) position of the largest region among these d1, d3, and d4 is set as a new Dm, and the calculated value Dm is raised to an exponent γ (= 2.2) and transmitted. A rate (luminance value) Tm is obtained (S53).
Next, the drive signal level V corresponding to the transmittance (brightness value) Tm obtained in S53 is set as the next drive signal level in the approximate lines connecting the measurement points consisting of the drive signal levels and the brightness values at that time. (S54).

  For example, as shown in FIG. 7, the transmittance Tm corresponding to the intermediate value Dm of d4 is obtained, and in the VT characteristic diagram, the measurement point 3 that is the next largest transmittance after the transmittance Tm and the transmittance Tm are next. The drive signal level V5 that is the horizontal axis value of the intersection between the measurement point 4 having a low transmittance and the transmittance Tm is set as the next drive signal level of the drive signal that is next input to the liquid crystal panel 11. (S54). Thereby, a 3rd setting process is complete | finished.

Next, the measurement control unit 31 operates the output image measurement unit 312 to drive the liquid crystal panel 11 with the set input value V5, and uses the color luminance meter 2 to calculate chromaticity and transmittance (brightness value) T5. Measurement is performed and the measured value is stored in the VT characteristic data 332 (S6).
In this embodiment, T5 is about 0.9, and if plotted in the VT characteristic diagram of FIG. 7, measurement point 5 (V5, T5) is obtained.

The measurement control unit 31 checks whether or not the number of measurement data has been obtained in advance (S7). For example, in the case where 33 measurement points are set, the third setting step (S5) and the next drive signal level set in the third setting step are used until the number of measurements is reached. The measurement process (S6) is repeated.
For example, after measuring the transmittance T5, as shown in FIG. 8, a calculated value D5 corresponding to the transmittance T5 is obtained (S51), among the already calculated D1 to D4, smaller than D5, and A divided region d4 between a point D4 having a value closest to D5 and a point D3 having a value larger than D5 and closest to D5 is divided by the calculated value D5 to form two divided regions d5 and d6. (S52), a transmittance Tm corresponding to the intermediate value Dm of the largest region d5 among d1, d3, d5 and d6 dividing the region D is obtained (S53), and a straight line connecting the measurement points 4 and 5 is obtained. The next drive signal level V6 is obtained from the transmittance Tm (S54).
Then, the drive signal level V6 is input to the liquid crystal panel 11, and the transmittance T6 of the image is measured (S6).

The above processing is repeated until the point n is calculated. For example, if n = 33 is set, points 1 to 33 are plotted in the VT characteristic diagram. At this time, each of the D1 to Dn is arranged at almost equal intervals because the maximum divided region is sequentially divided into two.
When the number of measurement data reaches the set number in S7, the measurement control unit 31 calculates VT characteristic data based on the measurement data by the input / output characteristic calculation unit 313 and stores it in the VT characteristic data 332 (S8). ). Specifically, the input / output characteristic calculation unit 313 performs spline interpolation between the measurement points as shown in FIG. 9 and stores it in the VT characteristic data 332.
Thus, the measurement process for the R panel is completed. The same measurement process is performed on the other G and B panels. FIG. 9 shows a graph of VT characteristics in each panel obtained in this way.

  In the present embodiment, the drive signal setting step is configured by the first setting step S1, the second setting step S3, and the third setting step S5 in the processing flow shown in FIG. Further, the output image measurement step is constituted by the measurement processing steps S2, S4, and S6. Furthermore, an input / output characteristic calculation step is configured by the VT characteristic calculation step of S8.

[Image quality adjustment processing]
The image quality adjustment unit 321 of the image quality adjustment unit 32 creates look-up table (LUT) data 333 based on the VT characteristic data 332 relating to each panel measured by the measurement control unit 31 and the gamma correction data 331. The LUT data 333 is data in which the relationship between the input signal to the liquid crystal projector 1 and the drive signal of the liquid crystal panel 11 is correlated on a one-to-one basis.
For example, in the liquid crystal projector 1 that performs the correction of γ = 2.2, the transmittance T4 with respect to the input value D4 (= about 524) needs to be about 0.22. Therefore, when the input value to the liquid crystal projector 1 is D4, the drive signal for driving the liquid crystal panel 11 may be a signal (V4) with a transmittance of T4 in the VT characteristic graph. LUT data 333 is created by obtaining the relationship between the input signal D to the liquid crystal projector 1 and the drive signal of the liquid crystal panel 11.

The image quality adjustment unit 32 registers the created LUT data 333 in the memory in the liquid crystal projector 1. As a result, the image / video signal input to the liquid crystal projector 1 is subjected to correction processing using the LUT data 333 in the drive control unit 12 and input to the liquid crystal panel 11. For this reason, the liquid crystal projector 1 performs image quality adjustment suitable for displaying a general video signal.
When the liquid crystal projector 1 displays other γ characteristics, the graph (data) of the gamma characteristic diagram is changed to gamma correction data (for example, γ = 1.8) corresponding to the γ characteristics of the input signal. Measure the VT characteristics and create the LUT.

According to the first embodiment described above, there are the following effects.
(1) When measuring the input / output display characteristics (VT characteristics) of the liquid crystal panel 11, the level of the drive signal input to the liquid crystal panel 11 is not switched at equal intervals, but the brightness value (transmittance) T of the display image. Since the level of each drive signal is set so that the value D obtained by raising 1 to the power of 1 / γ is substantially equidistant, it is substantially equidistant within the change range of the signal actually input to the liquid crystal projector 1. It is possible to measure the luminance value and the transmittance with respect to the input signal set to. In other words, when measuring the output display characteristics, the level of the drive signal directly input to the liquid crystal panel 11 is not measured while being changed at regular intervals, but is actually input to the liquid crystal projector 1 by taking gamma correction into consideration. Since the level of the drive signal is changed so that the level of the input signal to be changed changes at substantially equal intervals, as shown in FIG. 9, the measurement points of the input / output display characteristics are almost all over the entire change region of the input signal. It can be set uniformly and the most suitable measurement point can be selected when measuring input / output characteristics. For this reason, the number of measurement points required to create the LUT data 333 can be reduced as compared with the conventional measurement method in which the display output characteristics are measured at equal intervals of the drive signal input to the liquid crystal panel 11. Measurement time can be shortened and measurement efficiency can be improved. Further, when the number of measurement points is the same, the accuracy of the input / output characteristic data can be made higher.
Since the accuracy of the input / output characteristic data can be increased, the LUT data 333 can also be increased in accuracy, and the liquid crystal projector 1 can perform image quality adjustment with higher accuracy.

(2) Since the gamma value γ is set to 2.2 and measured, the LUT data 333 can be adjusted to the display characteristics of the CRT. For this reason, the liquid crystal projector 1 can be a display device suitable for displaying general video / image data based on the output from the CRT.

(3) When the next drive signal level is set, the measured transmittance data is applied to the gamma correction graph to calculate the value D, and a divided region is formed by the calculated value D. Since the second and third setting steps for setting the signal level of the drive signal based on the intermediate value of the maximum area are used, the input level can be easily set without performing complicated calculation processing.
Moreover, since the maximum area is set based on actual measurement data, an appropriate input level can be set even if the characteristics of the liquid crystal panel 11 are unknown.

(4) In the second and third setting steps, since a straight line passing through the measurement point is used as an approximate line, the next drive signal level V can be easily calculated using the calculated transmittance Tm. In this respect, the measurement process can be easily performed.
Further, since the processes in the second and third setting steps are basically the same process, the same routine can be used for the processing program, and the process can be performed efficiently.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.
In the present embodiment, as shown in FIG. 10, when setting the signal level of the drive signal by the drive signal setting means 311, the lightness index L ^* of the output image of the liquid crystal panel 11 when each drive signal is input is substantially the same. The only difference is that the signal level of each drive signal is set so as to be equally spaced.
Accordingly, the configuration of the image quality adjustment device 3 is the same as that of the first embodiment except that the data of the brightness index L ^* is added to the storage unit 33.
Also, in the processing flow, the transmittance T is calculated based on the point where the brightness index is obtained from the transmittance (luminance value) T in S31 and S51, and the intermediate value of the maximum divided area of the brightness index in S33 and 53. However, only the point of using the brightness index graph is different, and the other processes are the same as those in the first embodiment.
The lightness index L ^* is as follows. When Y / Yn> 0.008856, where transmittance T = luminance value Y and transmittance T = 1.0 = luminance value Yn of the complete diffusion surface, L ^* = 116 (Y / Yn) When ^1/3 -16 and Y / Yn <= 0.008856, L ^* = 903.3 × (Y / Yn).

Also in the present embodiment, the measurement processes of the processing flows S1 to S8 are performed on the R, G, and B panels, and the third setting process (S5) and the measurement process are performed until the necessary number of measurement data is obtained. By repeating (S6), the VT characteristic shown in FIG. 11 is obtained.
Further, the image quality adjusting means 321 of the image quality adjusting unit 32 is similar to the first embodiment, and based on the measured VT characteristic data 332 and the gamma correction data 331 of the liquid crystal projector 1, look-up table (LUT) data. 333 is created and registered in the liquid crystal projector 1.

In this embodiment as well, the same operational effects as those of the first embodiment can be obtained, and L ^* corresponds to the lightness axis of the uniform color space. Measurement data of uniform gradation steps can be obtained.

The present invention is not limited to the above embodiments.
For example, in each of the above embodiments, the approximate line connecting the measurement points is a straight line, but an approximate curve using measurement data of the liquid crystal panel 11 having the same specification may be used. Since the VT characteristic of the liquid crystal panel 11 is usually a non-linear S-shaped curve as in the above-described embodiment, a more appropriate drive signal level can be set by using the approximate curve than when the approximate line is a straight line. .

Further, the second setting process and the third setting process are not limited to the processing method for calculating the transmittance Tm by sequentially setting the intermediate values of the divided areas as in the above embodiments. For example, when an approximate line that approximates the input / output characteristics can be set from the measurement data of other liquid crystal panels 11, the calculated value D of the gamma correction graph and the brightness index L ^* are divided into 33 equal parts in advance, and each transmission The drive signal level may be calculated collectively by associating the rate with the approximate curve.

  The object of the display output characteristic measurement method and image quality adjustment method of the present invention is not limited to a transmissive three-plate liquid crystal projector, but may be a liquid crystal projection television, or a liquid crystal projector or liquid crystal display using a direct view liquid crystal panel. Good. In addition, the display device is not limited to a liquid crystal panel, and may be a plasma television using a PDP panel, an organic EL display using an organic EL panel, or the like. In short, the present invention can be widely used for measurement of display output characteristics in a display body that needs to measure input / output characteristics for each display panel, and image quality adjustment of a display device using the measurement data.

1 is a block diagram illustrating a configuration of an image quality adjustment apparatus according to a first embodiment. The flowchart for demonstrating the measurement process of the input / output process of 1st Embodiment. The flowchart for demonstrating the process of a 2nd setting process. The flowchart for demonstrating the process of a 3rd setting process. The graph for demonstrating the process of a 1st setting process. The graph for demonstrating the process of a 2nd setting process. The graph for demonstrating the process of a 3rd setting process. The graph for demonstrating the process of a 3rd setting process. The graph which shows the measurement result of the input-output characteristic of 1st Embodiment. The graph for demonstrating the measurement process of the input / output process of 2nd Embodiment. The graph which shows the measurement result of the input-output characteristic of 2nd Embodiment. The graph which shows the measurement result of the input-output characteristic of a prior art example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Liquid crystal projector, 2 ... Color luminance meter, 3 ... Image quality adjustment apparatus, 11 ... Liquid crystal panel, 12 ... Drive control part, 31 ... Measurement control part, 32 ... Image quality adjustment part, 33 ... Memory | storage part, 311 ... Drive signal setting Means 312, output image measuring means, 313 ... input / output characteristic calculating means, 321 ... image quality adjusting means, 331 ... gamma correction data, 332 ... VT characteristic data, 333 ... LUT data.

Claims (12)

A drive signal setting step of sequentially switching and setting the signal level of the drive signal input to the display body for displaying an image;
An output image measurement step of sequentially inputting the drive signal whose signal level is set in the drive signal setting step to a display body, and measuring at least a luminance value of an output image displayed on the display body;
Based on the data measured in the output image measurement step, comprising an input / output characteristic calculation step for obtaining output characteristics of the output image with respect to the drive signal input to the display body,
In the drive signal setting step, when the gamma value for gamma correction set in the display device having the display body is γ, the luminance value of the output image of the display body when each drive signal is input is an index 1 / γ. A method for measuring input / output characteristics of a display body, wherein the signal level of each drive signal is set so that the values raised to the power of 1 are substantially equally spaced. A method for measuring input / output characteristics of a display body according to claim 1,
The method of measuring input / output characteristics of a display body, wherein the gamma value γ is 2.2. A method for measuring input / output characteristics of a display body according to claim 1 or 2,
The drive signal setting step includes
A first setting step of setting a minimum value V1, a median value V2, and a maximum value V3 in the signal level of the drive signal input to the display body;
The luminance values T1, T2, and T3 measured in the output image measurement step when the drive signals set in the first setting step are input are raised to exponents 1 / γ to calculate values D1, D2, and D3. Between the smallest data D1 and the next smallest data D2 among the calculated values is set as the divided area d1, and between the largest data D3 and the next largest data D2 is set as the divided area d2, and each drive is performed. In an approximate line connecting the signal levels V1 to V3 and the points 1 to 3 composed of the luminance values T1 to T3 at that time, a value Dm located in the middle of the maximum area among the divided areas is obtained by raising to an exponent γ. A second setting step of setting the drive signal level corresponding to the brightness value Tm to the next drive signal level of the drive signal next input to the display body;
When the drive signal set at the next drive signal level is input, the luminance value Ti measured in the output image measurement step is raised to the exponent 1 / γ to obtain the calculated value Di, and each of the already calculated values is calculated. Among them, a divided area dxy between a calculated value Dx smaller than the calculated value Di and closest to the calculated value Di and a calculated value Dy larger than the calculated value Di and closest to the calculated value Di is calculated as the calculated value. Divided by Di into two divided areas dx and dy, and in an approximate line connecting points each composed of each drive signal level and the luminance value at that time, a value Dm located in the middle of the maximum area among the divided areas is A third setting step of setting a drive signal level corresponding to a luminance value Tm obtained by raising to an exponent γ to a next drive signal level of a drive signal to be input next to the display body,
A method for measuring input / output characteristics of a display body, wherein the third setting step is repeated after the first setting step to the third setting step until the required number of measurement data is obtained. A drive signal setting step of sequentially switching and setting the signal level of the drive signal input to the display body for displaying an image;
An output image measurement step of sequentially inputting the drive signal whose signal level is set in the drive signal setting step to a display body, and measuring at least a luminance value of an output image displayed on the display body;
Based on the data measured in the output image measurement step, comprising an input / output characteristic calculation step for obtaining output characteristics of the output image with respect to the drive signal input to the display body,
In the drive signal setting step, the signal level of each drive signal is set so that the brightness index of the output image of the display body when each drive signal is input is substantially equidistant. Output characteristic measurement method. It is the input-output characteristic measuring method of the display body of Claim 4, Comprising:
The drive signal setting step includes
A first setting step of setting a minimum value V1, a median value V2, and a maximum value V3 in the signal level of the drive signal input to the display body;
When the drive signals set in the first setting step are input, the brightness indexes D1, D2, and D3 are obtained based on the luminance values T1, T2, and T3 measured in the output image measurement step, Among these, the division between the smallest data D1 and the next smallest data D2 is a divided area d1, and the area between the largest data D3 and the next largest data D2 is a divided area d2. Drive signal level corresponding to the brightness value Tm corresponding to the brightness index Dm located in the middle of the maximum area among the divided areas, in the approximate lines connecting the points 1 to 3 composed of the brightness values T1 to T3. A second setting step of setting the next drive signal level of the drive signal to be input next to the display body;
The lightness index Di is obtained based on the luminance value Ti measured in the output image measurement step when the drive signal set at the next drive signal level is input, and the lightness index Di is among the already calculated lightness indices. A divided area dxy between a lightness index Dx smaller than and closest to the lightness index Di and a lightness index Dy larger than the lightness index Di and closest to the lightness index Di is divided by the lightness index Di to be 2 The brightness value Tm corresponding to the brightness index Dm located in the middle of the maximum area in each of the divided areas on the approximate lines connecting the points composed of the drive signal levels and the brightness values at that time, with the two divided areas dx and dy. And a third setting step for setting the drive signal level corresponding to the next drive signal level of the drive signal next input to the display body,
A method for measuring input / output characteristics of a display body, wherein the third setting step is repeated after the first setting step to the third setting step until the required number of measurement data is obtained. It is the input-output characteristic measuring method of the display body of Claim 3 or Claim 5, Comprising:
The approximate line is a straight line passing through the two points;
The next drive signal level is set as a horizontal axis value when a vertical axis value is a luminance value Tm in the approximate line. Drive signal setting means for sequentially switching and setting the signal level of the drive signal input to the display body for displaying an image;
An output image measuring means for sequentially inputting a drive signal whose signal level is set by the drive signal setting means to a display body and measuring at least a luminance value of an output image displayed on the display body;
Based on the data measured by the output image measurement means, comprising input / output characteristic calculation means for obtaining output characteristics of the output image with respect to the drive signal input to the display body,
When the gamma value for gamma correction set in the display device having the display body is γ, the drive signal setting means sets the luminance value of the output image of the display body when each drive signal is input as an index 1 / γ. An apparatus for measuring input / output characteristics of a display body, wherein the signal level of each drive signal is set so that the values raised to the power of 1 are substantially equidistant. Drive signal setting means for sequentially switching and setting the signal level of the drive signal input to the display body for displaying an image;
An output image measuring means for sequentially inputting a drive signal whose signal level is set by the drive signal setting means to a display body and measuring at least a luminance value of an output image displayed on the display body;
Based on the data measured by the output image measuring means, comprising input / output characteristic measuring means for obtaining output characteristics of the output image with respect to the drive signal input to the display body,
The drive signal setting means sets the signal level of each drive signal so that the brightness index of the output image of the display body when each drive signal is input is substantially equidistant. Output characteristic measuring device. A drive signal setting step of sequentially switching and setting the signal level of the drive signal input to the display body for displaying an image;
An output image measurement step of sequentially inputting the drive signal whose signal level is set in the drive signal setting step to a display body, and measuring at least a luminance value of an output image displayed on the display body;
Based on the data measured in the output image measurement step, an input / output characteristic calculation step for obtaining an output characteristic of the output image with respect to the drive signal input to the display body,
An image quality adjustment step of creating a lookup table in which a relationship between an input signal input to a display device having a display body and a drive signal input to the display body is recorded and incorporated in the display device;
In the driving signal setting step, when the gamma value for gamma correction set in the display device is γ, a value obtained by raising the luminance value of the output image of the display body when each driving signal is input to an exponent of 1 / γ Set the signal level of each drive signal so that is almost equally spaced,
The image quality adjusting step creates the look-up table based on output characteristic data for the display body drive signal obtained in the input / output characteristic calculating step and the gamma correction data. Image quality adjustment method. A drive signal setting step of sequentially switching and setting the signal level of the drive signal input to the display body for displaying an image;
An output image measurement step of sequentially inputting the drive signal whose signal level is set in the drive signal setting step to a display body, and measuring at least a luminance value of an output image displayed on the display body;
Based on the data measured in the output image measurement step, an input / output characteristic calculation step for obtaining an output characteristic of the output image with respect to the drive signal input to the display body,
An image quality adjustment step of creating a lookup table in which a relationship between an input signal input to a display device having a display body and a drive signal input to the display body is recorded and incorporated in the display device;
In the drive signal setting step, the signal level of each drive signal is set so that the brightness index of the output image of the display body when each drive signal is input is substantially equidistant,
The image quality adjustment step creates the look-up table based on output characteristic data for the display body drive signal obtained in the input / output characteristic calculation step and gamma correction data set in the display device. A characteristic image quality adjustment method for a display device. Drive signal setting means for sequentially switching and setting the signal level of the drive signal input to the display body for displaying an image;
An output image measuring means for sequentially inputting a drive signal whose signal level is set by the drive signal setting means to a display body and measuring at least a luminance value of an output image displayed on the display body;
Based on the data measured by the output image measuring means, input / output characteristic calculating means for obtaining output characteristics of the output image with respect to the drive signal input to the display body;
An image quality adjusting means for creating a look-up table in which a relationship between an input signal input to a display device having a display body and a drive signal input to the display body is recorded and incorporated in the display device;
The drive signal setting means, when the gamma value for gamma correction set in the display device is γ, a value obtained by raising the luminance value of the output image of the display body when each drive signal is input to an exponent of 1 / γ Set the signal level of each drive signal so that is almost equally spaced,
The image quality adjusting means creates the look-up table based on output characteristic data for the display body drive signal obtained by the input / output characteristic calculating means and the gamma correction data. Image quality adjustment device. Drive signal setting means for sequentially switching and setting the signal level of the drive signal input to the display body for displaying an image;
An output image measuring means for sequentially inputting a drive signal whose signal level is set by the drive signal setting means to a display body and measuring at least a luminance value of an output image displayed on the display body;
Based on the data measured by the output image measuring means, input / output characteristic calculating means for obtaining output characteristics of the output image with respect to the drive signal input to the display body;
An image quality adjusting means for creating a look-up table in which a relationship between an input signal input to a display device having a display body and a drive signal input to the display body is recorded and incorporated in the display device;
The drive signal setting means sets the signal level of each drive signal so that the brightness index of the output image of the display body when each drive signal is input is substantially equidistant,
The image quality adjusting means creates the look-up table based on output characteristic data for the display body drive signal obtained by the input / output characteristic calculating means and gamma correction data set in the display device. An image quality adjusting device for a display device.

Images