Method and apparatus for performing a series of optical measurements using a 2D imaging system

Abstract

The invention relates to a method for performing a series of optical measurements (100) on an activated display, during and / or between which the performance of an optical characteristic of the activated display changes, whether or not the display has been mounted on an actual display device, the series of optical measurements being configured as a measurement sequence comprising a pair of identical 2D image measurements or a pair of identical light spot measurements combined with 2D image measurements, in order to determine with increased accuracy the brightness, color point and spectral distribution of the emitted light, as well as the distribution of the brightness and color point over the entire luminous area of ​​the activated display. The invention also relates to an optical measurement device (300) for performing a series of optical measurements (100) according to the method of the invention.

Description

Technical Field

[0001] The invention relates to a method of performing a series of optical measurements using a 2D imaging system on an activated display. The invention further relates to an optical measurement device comprising a 2D imaging system and a processor configured and arranged to perform the method according to the invention. Background Art

[0002] Digital display technology is very common in electronic devices, whether wearable or not. Televisions, computer monitors, phones, test equipment, watches, one can almost imagine an endless list in which displays are used. In the context of the present invention, any device that includes a display is understood and referred to as a display device. The display included in a display device can be manufactured using, for example, LCD technology combined with a backlight. Alternatively, the display can also be manufactured using LED or OLED technology, wherein each pixel of the display is formed by a single light source or a combination of light sources, for example, a combination of red, green, and blue light sources. Typically, the pixels are arranged in a 2D matrix that extends to the boundaries of the display.

[0003] The display can have different shapes and sizes. Typically, the display has a rectangular shape, however, depending on the specific application and design of the display device on which the display is mounted, the display can have a different shape, for example, a circular shape applied to a watch.

[0004] For a new generation of display devices, the performance of at least some optical properties of the displays used therein needs to be improved compared to the previous generation. In the context of the present invention, examples of such optical properties of particular interest are brightness, color point and spectral distribution.

[0005] Based on the above, it is very important to test the optical characteristics of a display that has been turned on, especially to test an activated display that has been installed in an actual display device. In a production line environment, a 2D imaging system is usually used to test the optical characteristics of an activated display that has been installed in an actual display device. Known optical measurement methods that include a 2D imaging system are configured to either perform multiple 2D measurements using a camera and different optical filters for each measurement, or to perform reference spot measurements using a spectrometer or a colorimeter, and to perform 2D measurements using a camera.

[0006] One problem associated with the known optical measurement methods including the 2D imaging system described above is that if the performance of the optical characteristic of the activated display changes during and / or between measurements, then the optical characteristic value of the activated display cannot be determined with the required measurement accuracy, especially but not limited to the activated display installed on the actual display device. The above changes may be caused by transient changes in the control current and voltage, for example. As an example, another reason why the performance of the optical characteristic of the activated display changes during and / or between measurements may be a temperature gradient. As an example, for a display installed in a display device, the temperature gradient may be attributed to structural aspects of the display device, such as the proximity of a heat generating unit (such as a battery) to the display. An example of the latter is that the temperature of the display may change over time due to changes in the heat generated by the battery, depending on the use of the display device over time. If the display device is turned on to activate the display to perform a test using the above 2D imaging system, the temperature of the display will change until equilibrium is reached. After this equilibrium is established, the test can be performed. However, doing so will generate waiting time, which may have a negative impact on the speed of the test and thus the throughput of the production line. Furthermore, even if the test is performed after equilibrium has been reached, temperature gradients may still occur during and / or between measurements that disturb the established equilibrium, for example due to changes in the heat generated by the battery.

[0007] Based on the above, a method for performing optical measurements using a 2D imaging system is needed, which can quickly determine the optical characteristic values ​​of an activated display with the required measurement accuracy, regardless of whether the activated display is installed in an actual display device, and even though the performance of the optical characteristics of the activated display may change during and / or between measurements. Summary of the invention

[0008] The object of the present invention is to provide a method for performing a series of optical measurements using a 2D imaging system on an activated display, the performance of the optical characteristics of the activated display changing during and / or between the series of optical measurements, which method prevents or at least reduces at least one of the above-mentioned and / or other disadvantages associated with optical measurement methods involving 2D imaging systems known in the art.

[0009] Aspects of the invention are set out in the accompanying independent and dependent claims. Features in the dependent claims may be combined with features of the independent claims as appropriate and not merely as explicitly set out in a claim.

[0010] At least one of the above objects is achieved by a method for performing a series of optical measurements using a 2D imaging system on an activated display, the performance of an optical property of the activated display changing during and / or between the series of optical measurements, wherein an improved comparability is achieved for values ​​of the optical property determined based on measurement results of the optical property obtained by performing the series of optical measurements, the method comprising:

[0011] configuring the 2D imaging system to perform each optical measurement of the series of optical measurements as a measurement sequence so as to obtain a set of measurement results of a corresponding optical property for each optical measurement; and

[0012] A respective optical property value is determined for each optical measurement of the series of optical measurements by performing a time averaging of the measurement results of the respective set of measurement results of the respective optical measurement.

[0013] The skilled person will appreciate that in the context of the present invention, the optical properties of the activated display of particular interest are brightness, color point and spectral distribution. Furthermore, the skilled person will appreciate that the 2D imaging system comprises at least one camera and at least one optical filter. Regardless of whether the display has been installed in an actual display device, the method according to the present invention enables the comparability of the values ​​determined for the above optical properties of the activated display to be improved, although the performance of the optical properties of the activated display may change during and / or between measurements. As a result, the accuracy of the measurements capable of determining the values ​​of the optical properties of interest is improved. This allows the optical properties of the activated display to be characterized and controlled more accurately.

[0014] Furthermore, by using the method according to the invention, it is not necessary to wait until the display is in an equilibrium state after switching on before carrying out the measurement with the method according to the invention. The method according to the invention thus also allows the optical property values ​​of an activated display to be determined quickly with an increased accuracy compared to the methods known in the art. The method according to the invention thus has a positive effect on the speed of in-line tests, i.e. tests on the optical properties of activated displays in a production line, and thus on the throughput of the production line.

[0015] In one embodiment of the method according to the present invention, configuring the 2D imaging system to perform each optical measurement in the series of optical measurements as a measurement sequence so as to obtain a set of measurement results of a corresponding optical property for each optical measurement comprises:

[0016] determining a total time interval for performing the series of optical measurements by adding the respective time intervals for performing each respective optical measurement in the series of optical measurements;

[0017] The measurement sequence is configured to include at least one pair of identical 2D image measurements, wherein a first 2D image measurement in a first pair of identical 2D image measurements is performed using a first optical filter of a first type during a first time interval to obtain a first measurement result in the set of measurement results, and a second 2D image measurement in the first pair of identical 2D image measurements is performed using a first optical filter of the first type during a second time interval to obtain a second measurement result in the set of measurement results, wherein the first time interval and the second time interval are non-overlapping and are mirrored relative to a center of a total time interval.

[0018] By arranging the first time interval and the second time interval in the manner as described above, the comparability of the first measurement result and the second measurement result in the set of measurement results obtained from the first pair of identical 2D image measurements can be improved by the above-mentioned time averaging of the first measurement result and the second measurement result. Due to the time averaging, the effect of the performance change of the optical characteristic of interest occurring during and / or between the first pair of identical 2D image measurements on the first measurement result and the second measurement result obtained by the first pair of identical 2D image measurements can be reduced or, ideally, eliminated. Since the comparability of the measurement results of the first pair of identical 2D image measurements is improved, the measurement accuracy of determining the optical characteristic value of interest based on the first measurement result and the second measurement result can be improved.

[0019] A person skilled in the art will appreciate that the measurements of the first pair of 2D image measurements are identical because they are performed in the same way using the same first optical filter of the first type. Obviously, the first optical filter of the first type may be any suitable RGB filter or XYZ filter.

[0020] A person skilled in the art will appreciate that a measurement sequence comprising a first 2D image measurement and a second 2D image measurement of a first pair of identical 2D image measurements can be performed for any color, such as red, green, blue or a mixture of these colors. For example, the first pair of 2D image measurements as described above can be performed on an activated display, on which a test image is displayed, thereby causing the entire light emitting area of ​​the activated display to emit red light. Then, by using a red filter for a first optical filter of the first type, a first 2D image measurement sequence can be performed to determine the brightness, color point and spectral distribution of the emitted red light, and at least one of the brightness and color point distribution over the entire light emitting area of ​​the activated display. A person skilled in the art will appreciate that any suitable test image comprising any color and / or pattern can be used.

[0021] In addition, those skilled in the art will appreciate that for any of the optical properties of interest as described above, i.e., brightness, color point or spectral distribution, the x and y chromaticity coordinates according to the CIE 1931 xy chromaticity diagram can be determined based on the value of the determined optical property of interest.

[0022] In one embodiment of the method according to the invention, the measurement sequence is configured to include a second pair of identical 2D image measurements, wherein a third 2D image measurement of the second pair of identical 2D image measurements is performed during a third time interval using a second optical filter of a second type to obtain a third measurement result in the set of measurement results, and a fourth 2D image measurement of the second pair of identical 2D image measurements is performed during a fourth time interval using a second optical filter of the second type to obtain a fourth measurement result in the set of measurement results. The third time interval and the fourth time interval of the second pair of identical 2D image measurements do not overlap with each other or with the first time interval and the second time interval of the first pair of identical 2D image measurements, and the third time interval and the fourth time interval of the second pair of identical 2D image measurements are also mirrored with respect to the center of the total time interval.

[0023] By arranging the third time interval and the fourth time interval in the above manner, the comparability of the third measurement result and the fourth measurement result in the set of measurement results obtained from the second pair of identical 2D image measurements can be improved by time averaging the third measurement result and the fourth measurement result as described above. Due to the time averaging, the effect of the performance change of the optical characteristic of interest occurring during and / or between the second pair of identical 2D image measurements on the third measurement result and the fourth measurement result can be reduced or, ideally, eliminated. Since the comparability of the measurement results of the second pair of identical 2D image measurements is improved, the measurement accuracy of determining the optical characteristic value of interest based on the third measurement result and the fourth measurement result can be improved.

[0024] A person skilled in the art will appreciate that the measurement results of the second pair of 2D image measurements are the same because they are performed in the same way using the same second optical filter of the second type. Obviously, the second optical filter of the second type may be any suitable RGB optical filter or XYZ optical filter that is different from the RGB optical filter or XYZ optical filter used as the first optical filter.

[0025] A person skilled in the art will appreciate that for any specified color, such as red, green, blue or any mixture of these colors, a measurement sequence including the third 2D image measurement and the fourth 2D image measurement in the second pair of identical 2D image measurements as described above can be performed. For example, the second pair of 2D image measurements as described above can be performed on an activated display, wherein a test image is displayed on the display, thereby causing the entire luminous area of ​​the activated display to emit green light. Using a green filter for the second optical filter of the second type, a second 2D image measurement sequence can then be performed to determine the brightness, color point and spectral distribution of the emitted green light, and at least one of the brightness and color point distribution of the entire luminous area of ​​the activated display. A person skilled in the art will appreciate that any suitable test image including any color and / or pattern can be used.

[0026] In addition, those skilled in the art will appreciate that for any of the optical properties of interest as described above, i.e., brightness, color point, or spectral distribution, the x and y chromaticity coordinates according to the CIE 1931 xy chromaticity diagram can be determined based on the value of the determined optical property of interest.

[0027] In one embodiment of the method according to the present invention, the measurement sequence is configured to include a third pair of identical 2D image measurements, wherein a fifth 2D image measurement of the third pair of identical 2D image measurements is performed using a third optical filter of a third type during a fifth time interval to obtain a fifth measurement result in a set of measurement results, and a sixth 2D image measurement of the third pair of identical 2D image measurements is performed using a third optical filter of the third type during a sixth time interval to obtain a sixth measurement result in a set of measurement results, wherein the fifth time interval and the sixth time interval in the third pair of identical 2D image measurements neither overlap with each other nor with the first time interval and the second time interval in the first pair of identical 2D image measurements and the third time interval and the fourth time interval in the second pair of identical 2D image measurements, and wherein the fifth time interval and the sixth time interval in the third pair of identical 2D image measurements are also mirrored relative to the center of the total time interval.

[0028] By arranging the fifth time interval and the sixth time interval in the above manner, the comparability of the fifth measurement result and the sixth measurement result in the set of measurement results obtained from the third pair of identical 2D image measurements can be improved by time averaging the fifth measurement result and the sixth measurement result as described above. Due to the time averaging, the effect of performance changes of the optical characteristic of interest occurring during and / or between the third pair of identical 2D image measurements on the fifth measurement result and the sixth measurement result can be reduced or, ideally, eliminated. Since the comparability of the measurement results of the third pair of identical 2D image measurements is improved, the measurement accuracy of determining the optical characteristic value of interest based on the fifth measurement result and the sixth measurement result can be improved.

[0029] A person skilled in the art will appreciate that the measurements of the third pair of 2D image measurements are identical because they are performed in the same manner using the same third type of optical filter. Obviously, the third type of third optical filter may be any suitable RGB optical filter or XYZ optical filter that is different from the RGB optical filter or XYZ optical filter used as the first optical filter and the RGB optical filter or XYZ optical filter used as the second optical filter.

[0030] A person skilled in the art will appreciate that for any given color, such as red, green, blue or any mixture of these colors, a measurement sequence including the fifth 2D image measurement and the sixth 2D image measurement of the third pair of identical 2D image measurements as described above can be performed. For example, the third pair of 2D image measurements as described above can be performed on an activated display, wherein a test image is displayed on the display, thereby causing the entire light emitting area of ​​the activated display to emit blue light. Then, by using a third type of blue optical filter, a third 2D image measurement sequence can be performed to determine the brightness, color point and spectral distribution of the emitted blue light, and at least one of the brightness and color point distribution over the entire light emitting area of ​​the activated display. A person skilled in the art will appreciate that any suitable test image including any color and / or pattern can be used.

[0031] In addition, those skilled in the art will appreciate that for any of the optical properties of interest as described above, i.e., brightness, color point or spectral distribution, the x and y chromaticity coordinates according to the CIE1931 xy chromaticity diagram can be determined based on the values ​​determined for the optical property of interest.

[0032] In one embodiment of the method according to the present invention, configuring the 2D imaging system to perform each optical measurement in a series of optical measurements as a measurement sequence so as to obtain a set of measurement results of a corresponding optical property for each optical measurement comprises:

[0033] The measurement sequence is configured to include at least one pair of same-spot measurements and a first 2D image measurement, wherein the first spot measurement in the first pair of same-spot measurements is performed during a first time interval to obtain a first measurement result in a set of measurement results, the second spot measurement in the first pair of same-spot measurements is performed during a second time interval to obtain a second measurement result in the set of measurement results, and the first 2D image measurement is performed during a third time interval using a first optical filter of a first type to obtain a third measurement result in the set of measurement results, wherein the first time interval, the second time interval, and the third time interval are non-overlapping, and wherein the first time interval and the second time interval are mirrored relative to a center of the third time interval.

[0034] By arranging the first time interval, the second time interval, and the third time interval in the above manner, the comparability of the first measurement result and the second measurement result can be improved by time averaging the first measurement result and the second measurement result in the set of measurement results obtained from the first pair of same spot measurements as described above. Due to the time averaging, the effect of the performance change of the optical property of interest occurring during and / or between the first pair of same spot measurements on the first measurement result and the second measurement result obtained by the first pair of same spot measurements can be reduced or, ideally, eliminated. Since the comparability of the first pair of same spot measurements is improved, the measurement accuracy of determining the optical property value of interest based on the first measurement result and the second measurement result can be improved. Those skilled in the art will understand that the measurement results of the first pair of spot measurements are the same because they are performed with the same settings.

[0035] In addition, due to the above-mentioned time averaging, the first measurement result and the second measurement result in the measurement result set are actually obtained at a time coinciding with the center of the third time interval, during which the first 2D image measurement is performed to obtain the third measurement result in the measurement result set. Therefore, the comparability of the first measurement result, the second measurement result, and the third measurement result in the measurement result set is improved. Since the first measurement result, the second measurement result, and the third measurement result in the measurement result set are actually obtained at the same time, and thus are difficult or theoretically not affected by the change in the performance of the optical characteristic of interest that occurs during and / or between the measurement of the first pair of identical light spot measurements and the first 2D image measurement on the activated display, the measurement accuracy of determining the optical characteristic value of interest based on the first measurement result, the second measurement result, and the third measurement result in the measurement result set is improved. Therefore, the method according to the present invention can accurately determine the optical characteristic value of the activated display.

[0036] Those skilled in the art will appreciate that the first spot-2D spot measurement sequence described above can be performed for any specified color, such as red, green, blue or any mixture of these colors. For example, a test image can be displayed on an activated display so that the entire luminous area of ​​the activated display emits red light. Then, as an example, by performing the first spot-2D-spot measurement sequence, for example, the brightness, color point and spectral distribution of the emitted red light, and at least one of the brightness and color point distribution over the entire luminous area of ​​the activated display can be determined. Those skilled in the art will appreciate that any suitable test image containing any color and / or pattern can be used.

[0037] In addition, those skilled in the art will understand that for any of the optical properties of interest as described above, i.e., brightness, color point or spectral distribution, the x and y chromaticity coordinates according to the CIE 1931 xy chromaticity diagram can be determined based on the value of the determined optical property of interest.

[0038] In one embodiment of the method according to the present invention, the measurement sequence is configured to include a second pair of same-spot measurements and a second 2D image measurement, wherein the third spot measurement in the second pair of same-spot measurements is performed during a fourth time interval to obtain a fourth measurement result in a set of measurement results, the fourth spot measurement in the second pair of same-spot measurements is performed during a fifth time interval to obtain a fifth measurement result in a set of measurement results, and the second 2D image measurement is performed during a sixth time interval using a second type of optical filter to obtain a sixth measurement result in the set of measurement results, wherein the fourth time interval, the fifth time interval and the sixth time interval of the second pair of same-spot measurements and the second 2D image measurements do not overlap, respectively, and do not overlap with the first time interval, the second time interval and the third time interval of the first pair of same-spot measurements and the first 2D image measurement, respectively, and wherein the fourth time interval and the fifth time interval are mirrored relative to the center of the sixth time interval.

[0039] By arranging the fourth time interval, the fifth time interval, and the sixth time interval in the above manner, the comparability of the fourth measurement result and the fifth measurement result can be improved by time averaging the fourth measurement result and the fifth measurement result in the set of measurement results obtained from the second pair of same spot measurements as described above. Due to the time averaging, the effect of the performance change of the optical property of interest occurring during and / or between the second pair of same spot measurements on the fourth measurement result and the fifth measurement result obtained by the second pair of same spot measurements can be reduced or, ideally, eliminated. Since the comparability of the second pair of same spot measurements is improved, the measurement accuracy of determining the optical property value of interest based on the fourth measurement result and the fifth measurement result is improved. Those skilled in the art will appreciate that the measurement results of the second pair of spot measurements are the same because they are performed with the same settings.

[0040] In addition, due to the above-mentioned time averaging, the fourth measurement result and the fifth measurement result in the measurement result set are actually obtained at the time when the center of the sixth time interval coincides, and the second 2D image measurement is performed during the sixth time interval to obtain the sixth measurement result in the measurement result set. Thereby, the comparability of the fourth measurement result, the fifth measurement result and the sixth measurement result in the measurement result set is improved. Since the fourth measurement result, the fifth measurement result and the sixth measurement result in the measurement result set are actually obtained at the same time, and thus it is difficult or theoretically not affected by the change in the performance of the optical characteristic of interest that occurs during and / or between the second pair of the same light spot measurement and the second 2D image measurement on the activated display, the measurement accuracy of determining the optical characteristic value of interest based on the fourth measurement result, the fifth measurement result and the sixth measurement result in the measurement result set is improved. Therefore, the method according to the present invention can accurately determine the optical characteristic value of the activated display.

[0041] Those skilled in the art will appreciate that the second spot-2D-spot measurement sequence described above can be performed for any specified color, such as red, green, blue, or any mixture of these colors. For example, a test image can be displayed on an activated display, thereby causing the entire luminous area of ​​the activated display to emit green light. Then, by performing the second spot-2D-spot measurement sequence, the brightness, color point and spectral distribution of the emitted green light, as well as at least one of the brightness and color point distribution over the entire luminous area of ​​the activated display can be determined. Those skilled in the art will appreciate that any suitable test image containing any color and / or pattern can be used.

[0042] In addition, those skilled in the art will understand that for any of the optical properties of interest as described above, i.e., brightness, color point or spectral distribution, the x and y chromaticity coordinates according to the CIE 1931 xy chromaticity diagram can be determined based on the determined value of the optical property of interest.

[0043] In one embodiment of the method according to the present invention, the measurement sequence is configured to include a third pair of same-spot measurements and a third 2D image measurement, wherein the fifth spot measurement of the third pair of same-spot measurements is performed during a seventh time interval to obtain a seventh measurement result in a set of measurement results, the sixth spot measurement of the third pair of same-spot measurements is performed during an eighth time interval to obtain an eighth measurement result in a set of measurement results, and the third 2D image measurement is performed during a ninth time interval using a third optical filter of a third type to obtain a ninth measurement result in a set of measurement results, wherein the seventh time interval, the eighth time interval and the ninth time interval of the third pair of same-spot measurements and the third 2D image measurements do not overlap, respectively, and do not overlap with any of the first time interval, the second time interval and the third time interval in the first pair of same-spot measurements and the first 2D image measurements, and the fourth time interval, the fifth time interval and the sixth time interval in the second pair of same-spot measurements and the second 2D image measurements, respectively, and wherein the seventh time interval and the eighth time interval are mirrored relative to the center of the ninth time interval.

[0044] By arranging the seventh time interval, the eighth time interval, and the ninth time interval in the above manner, the comparability of the seventh measurement result and the eighth measurement result in the set of measurement results obtained from the third pair of same spot measurements can be improved by time averaging the seventh measurement result and the eighth measurement result as described above. Due to the time averaging, the effect of the performance change of the optical property of interest occurring during and / or between the third pair of same spot measurements on the seventh measurement result and the eighth measurement result obtained by the third pair of same spot measurements can be reduced or, ideally, eliminated. Since the comparability of the third pair of same spot measurements is improved, the measurement accuracy of determining the optical property value of interest based on the seventh measurement result and the eighth measurement result is improved. Those skilled in the art will appreciate that the measurement results of the third pair of spot measurements are the same because they are performed with the same settings.

[0045] In addition, due to the above-mentioned time averaging, the seventh measurement result and the eighth measurement result in the measurement result set are actually obtained at the time when the center of the ninth time interval coincides, and the third 2D image measurement is performed during the ninth time interval to obtain the ninth measurement result in the measurement result set. Thereby, the comparability of the seventh measurement result, the eighth measurement result and the ninth measurement result in the measurement result set is improved. Since the seventh measurement result, the eighth measurement result and the ninth measurement result in the measurement result set are actually obtained at the same time, and thus it is difficult or theoretically not affected by the change in the performance of the optical characteristic of interest that occurs during and / or between the third pair of the same spot measurement and the third 2D image measurement on the activated display, the measurement accuracy of the process of determining the optical characteristic value of interest based on the seventh measurement result, the eighth measurement result and the ninth measurement result in the measurement result set is improved. Therefore, the method according to the present invention can accurately determine the optical characteristic value of the activated display.

[0046] Those skilled in the art will appreciate that the third light spot-2D-light spot measurement sequence described above can be performed for any specified color, such as red, green, blue, or any mixture of these colors. For example, a test image can be displayed on an activated display, thereby causing the entire light emitting area of ​​the activated display to emit blue light. Then, by performing the third light spot-2D-light spot measurement sequence, the brightness, color point and spectral distribution of the emitted blue light, as well as at least one of the brightness and color point distribution over the entire light emitting area of ​​the activated display can be determined. Those skilled in the art will appreciate that any suitable test image containing any color and / or pattern can be used.

[0047] In addition, those skilled in the art will understand that for any of the optical properties of interest as described above, i.e., brightness, color point or spectral distribution, the x and y chromaticity coordinates according to the CIE1931 xy chromaticity diagram can be determined based on the values ​​determined for the optical property of interest.

[0048] In one embodiment of the method according to the invention, the optical property of the activated optical display is one of brightness, color point and spectral distribution, and wherein, using a value determined by performing a time averaging of measurement results of a corresponding set of measurement results, x and y chromaticity coordinates according to the CIE 1931 xy chromaticity diagram can be determined for one of the brightness, color point and spectral distribution with an improved accuracy of less than 0.002.

[0049] Those skilled in the art will appreciate that a deviation in the spectral distribution results in a wavelength shift. This wavelength shift can be converted into x and y chromaticity coordinates according to the CIE 1931 xy chromaticity diagram. Since the x and y chromaticity coordinates of at least one of the above optical properties of the activated display can be determined with an accuracy of less than 0.002, the method according to the present invention can detect deviations in at least one of the brightness, color point and spectral distribution of the activated display, which deviations are not visible to the human eye because the sensitivity threshold of the human eye to deviations in any of the above optical properties is 0.002.

[0050] Another aspect of the invention is an optical measurement device for performing a series of optical measurements on an activated display, the display having an optical property that undergoes a property change during and / or between measurements of the series of optical measurements, wherein an improvement in accuracy is achieved for a value of the optical property determined based on measurement results of the optical property obtained by performing the series of optical measurements, the optical measurement device comprising:

[0051] a 2D imaging system configured and arranged to allow a series of optical 2D image measurements to be performed on the activated display;

[0052] a spot measurement system configured and arranged to allow a series of spot measurements to be performed on an activated display; and

[0053] A processing unit comprising a storage unit with computer instructions, the processing unit being operably connected to at least one of the 2D imaging system and the spot measurement system, for receiving in the storage unit measurement results of optical characteristics of an activated display, wherein when the computer instructions are run on the measurement results, the computer instructions perform the steps of the method according to any of the preceding claims to determine an optical characteristic value with improved accuracy based on the measurement results.

[0054] Thus, the optical measurement device according to the invention can quickly determine the optical properties of interest, such as the x and y chromaticity coordinates of the brightness, color point or spectral distribution of an activated display with an accuracy of less than 0.002. Therefore, the optical measurement device according to the invention can reduce the impact of online optical testing, i.e., testing of the optical properties of an activated display already installed in an actual display device, on the throughput of the production line. Therefore, the optical measurement device according to the invention makes online optical testing a viable option.

[0055] Those skilled in the art will appreciate that the 2D imaging system and the spot measurement system can be independent systems, but they can also be integrated into a combined system, such as the ATLAS and Titan series provided by ADMESY.

[0056] In one embodiment of the optical measuring device according to the invention, the 2D image system comprises a beam splitter configured and arranged to perform spot measurement and 2D image measurement simultaneously on the activated display.

[0057] Thus, the optical measurement device according to the present invention allows to determine the x and y chromaticity coordinates according to the CIE 1931 xy chromaticity diagram for an optical characteristic of interest of an activated display, such as at least one of brightness, color point and spectral distribution, with an accuracy of less than 0.002 in a more time-saving manner. Thus, the optical measurement device according to the present invention can further reduce the impact of in-line optical testing on production line throughput. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Further features and advantages of the invention will become apparent from the description of the invention by means of an exemplary and non-limiting embodiment of a series of optically measured configurations of the method according to the invention and by means of an exemplary and non-limiting embodiment of an optical measuring device according to the invention.

[0059] Those skilled in the art will appreciate that the described embodiments are merely illustrative in nature and should not be construed as limiting the scope of protection in any way. Those skilled in the art will appreciate that, without departing from the scope of protection of the present invention, alternatives and equivalent embodiments are conceivable and put into practice.

[0060] Reference will be made to the accompanying drawings in the accompanying drawings. These drawings are schematic in nature and are not necessarily drawn to scale. In addition, the same reference numerals represent the same or similar parts.

[0061] Figure 1 a schematic diagram showing an exemplary, non-limiting first embodiment of a configuration of a series of optical measurements according to the method of the invention, which uses a first pair of identical 2D image measurements to determine the brightness, the color point and the spectral distribution of a first type of emitted light, e.g. red light, and at least one of the brightness and the color point distribution over the entire light emitting area of ​​an activated display;

[0062] Figure 2 A schematic diagram showing an exemplary, non-limiting second embodiment of a configuration for a series of optical measurements according to the method of the invention, except that Figure 1 In addition to the first pair of identical 2D image measurements shown, a second pair of identical 2D image measurements are used to determine at least one of the brightness, color point, and spectral distribution of a second type of emitted light, such as green light, and the brightness and color point distribution of the entire light emitting area of ​​the activated display;

[0063] Figure 3A schematic diagram showing an exemplary, non-limiting third embodiment of a configuration for a series of optical measurements according to the method of the invention, except that Figure 1 The first pair of identical 2D images shown measures and Figure 2 In addition to the second pair of identical 2D image measurements shown, a third pair of identical 2D image measurements are used to determine at least one of the brightness, color point, and spectral distribution of a third type of emitted light, such as blue light, and the brightness and color point distribution of the entire light emitting area of ​​the activated display;

[0064] Figure 4 a schematic diagram showing an exemplary, non-limiting fourth embodiment of a configuration of a series of optical measurements according to the method of the invention, using a first pair of same-spot measurements and a first 2D image measurement to determine the brightness, the color point and the spectral distribution of a first type of emitted light, e.g. red light, and at least one of the brightness and the color point distribution over the entire light emitting area of ​​an activated display;

[0065] Figure 5 A schematic diagram showing an exemplary, non-limiting fifth embodiment of a configuration for a series of optical measurements according to the method of the invention, except that Figure 4 In addition to the first pair of same-spot measurements and the first 2D image measurements shown, a second pair of same-spot measurements and a second 2D image measurement are used to determine at least one of the brightness, color point, and spectral distribution of a second type of emitted light, such as green light, and the brightness and color point distribution of the entire light emitting area of ​​the activated display;

[0066] Figure 6 A schematic diagram showing an exemplary, non-limiting sixth embodiment of a configuration for a series of optical measurements according to the method of the invention, except that Figure 4 The first pair of same spot measurements and the first 2D image measurements shown, and Figure 5 In addition to the second pair of same-spot measurements and the second 2D image measurements shown, a third pair of same-spot measurements and a third 2D image measurement are used to determine at least one of the brightness, color point, and spectral distribution of a third type of emitted light, such as blue light, and the brightness and color point distribution of the entire light-emitting area of ​​the activated display;

[0067] Figure 7 a schematic top view showing an exemplary, non-limiting first embodiment of an optical measuring device according to the invention; and

[0068] Figure 8 Shown is a schematic top view of an exemplary, non-limiting second embodiment of an optical measuring device according to the present invention. DETAILED DESCRIPTION

[0069] Figure 1A schematic diagram of an exemplary, non-limiting first embodiment of a configuration of a series of optical measurements 100 according to the method of the invention is shown, which uses a first pair of identical 2D image measurements 101a, 101b to determine the brightness, color point and spectral distribution of a first type of emitted light, such as red light, and at least one of the distribution of the brightness and color point over the entire light emitting area of ​​an activated display (not shown).

[0070] In the context of the present invention, the 2D image system 301 comprises a camera 302 and a filter bank 303 equipped with at least one optical filter. Configuring the 2D image system 302 to perform a first pair of identical 2D image measurements 101a, 101b comprises: determining a total time interval T for performing the first pair of identical 2D image measurements 101a, 101b total .like Figure 1 As shown, the total time interval T total It can be determined by adding the respective time intervals T1 and T2 for performing each respective 2D image measurement in the first pair of identical 2D image measurements. Figure 1 As shown, the first time interval T1 and the second time interval T2 are non-overlapping and relative to the total time interval T total Center T center It is mirrored.

[0071] The skilled person will appreciate that the measurements in the first pair of 2D image measurements 101a, 101b are identical in the sense that the measurements are performed in the same manner using the same first optical filter of the first type (not shown). The first optical filter of the first type may be any suitable RGB filter or XYZ filter. As an example, the first 2D image measurement 101a in the first pair of identical 2D image measurements 101a, 101b may be performed using, for example, a red optical filter as the first optical filter of the first type to obtain a first measurement result A1 in the set of measurement results. In this case, the second 2D image measurement 101b of the first pair of identical 2D image measurements 101a, 101b is performed using the same red optical filter to obtain a second measurement result A2 in the set of measurement results. The skilled person will appreciate that the measurement sequence comprising the first 2D image measurement 101a and the second 2D image measurement 101b of the first pair of identical 2D image measurements 101a, 101b as described above may be performed for any specified color, such as red, green, blue or any mixture of these colors.

[0072] Through Figure 1Arranging the first time interval T1 and the second time interval T2 in the manner shown, the time averaging of the first measurement result A1 and the second measurement result A2 can be used to improve the comparability of the first measurement result A1 and the second measurement result A2 in the set of measurement results obtained from the first pair of identical 2D image measurements 101a, 101b. As described above, due to the time averaging, the impact of performance changes of the optical characteristic of interest occurring during and / or between the measurements of the first pair of identical 2D image measurements 101a, 101b on the first measurement result A1 and the second measurement result A2 can be reduced or, ideally, eliminated. Since the comparability of the first measurement result A1 and the second measurement result A2 in the first pair of identical 2D image measurements 101a, 101b is improved, the measurement accuracy of determining the optical characteristic value of interest, such as brightness, color point and spectral distribution, based on the first measurement result A1 and the second measurement result A2 can be improved. The method according to the invention allows the x and y chromaticity coordinates according to the CIE 1931 xy chromaticity diagram to be determined with an improved accuracy of less than 0.002 using the values ​​determined based on the first measurement result A1 and the second measurement result A2. In this way, the method according to the invention is able to detect deviations of at least one of the brightness, color point and spectral distribution of an activated display, which deviations are not visible to the human eye, since the sensitivity threshold of the human eye for deviations of any of the above optical properties is 0.002.

[0073] Figure 2 A schematic diagram showing an exemplary, non-limiting second embodiment of a configuration of a series of optical measurements 100 according to the method of the invention, except that Figure 1 In addition to the first pair of identical 2D image measurements 101a, 101b shown, a second pair of identical 2D image measurements 102a, 102b is used to determine the brightness, color point and spectral distribution of a second type of emitted light, such as green light, and at least one of the brightness and color point distribution of the entire light emitting area of ​​an activated display (not shown).

[0074] Those skilled in the art will appreciate that these measurements are identical in the sense that the measurements in the second pair of 2D image measurements 102a, 102b are performed in the same way using the same second optical filter of the second type. The second optical filter of the second type may be any suitable RGB filter or XYZ filter that is different from the RGB optical filter or XYZ optical filter used as the first optical filter.

[0075] The third 2D image measurement 102a of the second pair of identical 2D image measurements 102a, 102b may be performed with, for example, a green optical filter as a second optical filter of the second type to obtain a third measurement result B1 of the set of measurement results. In this case, the fourth 2D image measurement 101b of the second pair of identical 2D image measurements 101a, 101b is performed with the same green optical filter to obtain a fourth measurement result B2 of the set of measurement results. A person skilled in the art will appreciate that the measurement sequence including the third 2D image measurement 102a and the fourth 2D image measurement 102b of the second pair of identical 2D image measurements 102a, 102b as described above may be performed for any specified color, such as red, green, blue or any mixture of these colors.

[0076] like Figure 2 As shown, the third time interval T3 and the fourth time interval T4 in the second pair of identical 2D image measurements 102a, 102b do not overlap with each other, nor do they overlap with the first time interval T1 and the second time interval T2 of the first pair of identical 2D image measurements 101a, 101b. In addition, the third time interval T3 and the fourth time interval T4 in the second pair of identical 2D image measurements 102a, 102b are relatively large relative to the total time interval T total Center T center It is also mirrored.

[0077] Through Figure 2Arranging the third time interval T3 and the fourth time interval T4 in the manner shown, the time averaging of the third measurement result B1 and the fourth measurement result B2 can be used to improve the comparability of the third measurement result B1 and the fourth measurement result B2 in the set of measurement results obtained from the second pair of identical 2D image measurements 102a, 102b. As described above, due to the time averaging, the impact of the performance change of the optical characteristic of interest occurring during and / or between the measurements of the second pair of identical 2D image measurements 102a, 102b on the third measurement result B1 and the fourth measurement result B2 can be reduced or, ideally, eliminated. Since the comparability of the third measurement result B1 and the fourth measurement result B2 in the second pair of identical 2D image measurements 102a, 102b is improved, the measurement accuracy of determining the optical characteristic value of interest, such as brightness, color point and spectral distribution, based on the third measurement result B1 and the fourth measurement result B2 can be improved. The method according to the invention allows the x and y chromaticity coordinates according to the CIE 1931 xy chromaticity diagram to be determined with an improved accuracy of less than 0.002 using the values ​​determined based on the third measurement result B1 and the fourth measurement result B2. In this way, the method according to the invention is able to detect deviations of at least one of the brightness, color point and spectral distribution of an activated display, which deviations are not visible to the human eye, because the sensitivity threshold of the human eye for deviations of any of the above optical properties is 0.002.

[0078] Figure 3 A schematic diagram of an exemplary, non-limiting third embodiment of a configuration of a series of optical measurements 100 of the method of the invention is shown, except that Figure 1 The first pair of identical 2D image measurements 101a, 101b and Figure 2 In addition to the second pair of identical 2D image measurements 102a, 102b shown, a third pair of identical 2D image measurements 103a, 103b is used to determine the brightness, color point, and spectral distribution of a third type of emitted light, such as blue light, and at least one of the brightness and color point distribution of the entire light emitting area of ​​an activated display (not shown).

[0079] Those skilled in the art will appreciate that the same meaning is obtained from using the same third optical filter of the third type in the same way to perform the measurements in the third pair of 2D image measurements 103a, 103b. The third optical filter of the third type may be any suitable RGB filter or XYZ filter, which is different from the RGB optical filter or XYZ optical filter used as the first optical filter, and the RGB filter or XYZ filter used as the second optical filter.

[0080] As an example, the fifth 2D image measurement 103a in the third pair of identical 2D image measurements 103a, 103b may be performed with a blue optical filter as the third optical filter of the third type, thereby obtaining a fifth measurement result C1 in the set of measurement results. In this case, the sixth 2D image measurement 103b in the third pair of identical 2D image measurements 103a, 103b is performed with the same blue optical filter, thereby obtaining a sixth measurement result C2 in the set of measurement results. A person skilled in the art will appreciate that the measurement sequence including the fifth 2D image measurement 103a and the sixth 2D image measurement 103b in the third pair of identical 2D image measurements 103a, 103b as described above may be performed for any specified color, such as red, green, blue, or any mixture of these colors.

[0081] like Figure 3 As shown, the fifth time interval T5 and the sixth time interval T6 in the third pair of identical 2D image measurements 103a, 103b do not overlap with each other, nor do they overlap with the first time interval T1 and the second time interval T2 in the first pair of identical 2D image measurements 101a, 101b, and the third time interval T3 and the fourth time interval T4 in the second pair of identical 2D image measurements 102a, 102b. In addition, the fifth time interval T5 and the sixth time interval T6 in the third pair of identical 2D image measurements 103a, 103b are relatively large relative to the total time interval T total Center T center It is also mirrored.

[0082] Through Figure 3Arranging the fifth time interval T5 and the sixth time interval T6 in the manner shown, the temporal average of the fifth measurement result C1 and the sixth measurement result C2 can be used to improve the comparability of the fifth measurement result C1 and the sixth measurement result C2 in the set of measurement results obtained from the third pair of identical 2D image measurements 103a, 103b. As described above, due to the temporal average, the effect of the performance change of the optical characteristic of interest occurring during and / or between the measurements of the third pair of identical 2D image measurements 103a, 103b on the fifth measurement result C1 and the sixth measurement result C2 can be reduced or, ideally, eliminated. Since the comparability of the fifth measurement result C1 and the sixth measurement result C2 in the third pair of identical 2D image measurements 103a, 103b is improved, the measurement accuracy of determining the optical characteristic value of interest, such as brightness, color point and spectral distribution, based on the fifth measurement result C1 and the sixth measurement result C2 can be improved. The method according to the invention allows the x and y chromaticity coordinates according to the CIE 1931 xy chromaticity diagram to be determined with an improved accuracy of less than 0.002 using the values ​​determined based on the fifth measurement result C1 and the sixth measurement result C2. In this way, the method according to the invention is able to detect deviations of at least one of the brightness, color point and spectral distribution of an activated display that are not visible to the human eye, because the sensitivity threshold of the human eye for deviations of any of the above optical properties is 0.002.

[0083] Figure 4 A schematic diagram of an exemplary, non-limiting fourth embodiment of a configuration of a series of optical measurements 200 according to the method of the present invention is shown, using a first pair of identical spot measurements 201a, 201b and a first 2D image measurement 202 to determine the brightness, color point and spectral distribution of a first type of emitted light, such as red light, and at least one of the brightness and color point distribution over the entire light emitting area of ​​an activated display (not shown). A person skilled in the art will appreciate that the measurements of the first pair of spot measurements 201a, 201b are identical because they are performed with the same setup.

[0084] The first spot measurement 201a in the first pair of same spot measurements 201a, 201b is performed during the first time interval T1, thereby obtaining the first measurement result S1 in the measurement result set. The second spot measurement 201b in the first pair of same spot measurements 201a, 201b is performed during the second time interval T2, thereby obtaining the second measurement result S2 in the measurement result set. In addition, during the third time interval T3, for example, a red optical filter is used as the first optical filter of the first type to perform the first 2D image measurement 202, thereby obtaining the third measurement result A in the measurement result set.

[0085] Those skilled in the art will appreciate that the first spot-2D-spot measurement sequence described above can be performed for any specified color, such as red, green, blue, or any mixture of these colors. In the case of performing the first 2D image measurement 202 using a red optical filter, a test image (not shown) can be displayed on an activated display (not shown) so that the entire light emitting area of ​​the activated display emits red light. Then, as an example, by performing the first spot-2D-spot measurement sequence, the brightness, color point, and spectral distribution of the emitted red light, as well as at least one of the brightness and color point distribution over the entire light emitting area of ​​the activated display can be determined. Those skilled in the art will appreciate that any suitable test image containing any color and / or pattern can be used.

[0086] like Figure 4 As shown, the first time interval T1, the second time interval T2 and the third time interval T3 do not overlap. In addition, the first time interval T1 and the second time interval T2 are relative to the center T of the third time interval T3. center It is mirrored.

[0087] Through Figure 4 Arranging the first time interval T1, the second time interval T2, and the third time interval T3 in the manner shown can improve the comparability of the first measurement result S1 and the second measurement result S2 in the measurement result set by time averaging the first measurement result S1 and the second measurement result S2 as described above. Due to the time averaging, the impact of the change in the performance of the optical characteristic of interest occurring during and / or between the measurements of the first pair of same-spot measurements 201a, 201b on the first measurement result S1 and the second measurement result S2 can be reduced or, ideally, eliminated. Since the comparability of the measurement results S1 and S2 of the first pair of same-spot measurements 201a, 201b is improved, the measurement accuracy of determining the optical characteristic value of interest, such as brightness, color point, and spectral distribution, based on the first measurement result S1 and the second measurement result S2 can be improved.

[0088] In addition, due to the above time averaging, the first measurement result S1 and the second measurement result S2 in the measurement result set are actually at the center T of the third time interval T3. centerThe first 2D image measurement 202 is obtained at the time when the first and second light spot measurements 201a and 201b coincide with each other, and the first 2D image measurement 202 is performed within the third time interval to obtain the third measurement result A in the measurement result set. Thus, the comparability of the first measurement result S1, the second measurement result S2 and the third measurement result A in the measurement result set is improved. Since the first measurement result S1, the second measurement result S2 and the third measurement result A in the measurement result set are actually obtained at the same time, it is difficult or theoretically not affected by the change in the performance of the optical characteristic of interest that occurs during and / or between the measurement of the first pair of the same light spot measurements 201a, 201b and the first 2D image measurement 202 on the activated display (not shown). The measurement accuracy of determining the optical characteristic value of interest based on the first measurement result S1, the second measurement result S2 and the third measurement result A in the measurement result set is improved. Therefore, the method according to the present invention can accurately determine the optical characteristic value of the activated display.

[0089] Furthermore, the method according to the invention may allow the x and y chromaticity coordinates according to the CIE 1931 xy chromaticity diagram to be determined with an accuracy of less than 0.002 using the values ​​determined based on the first measurement result S1, the second measurement result S2 and the third measurement result A. In this way, the method according to the invention may detect deviations in at least one of the brightness, color point and spectral distribution of an activated display, which deviations are not visible to the human eye, because the sensitivity threshold of the human eye for deviations in any of the above optical properties is 0.002.

[0090] Figure 5 A schematic diagram showing an exemplary, non-limiting fifth embodiment of a configuration of a series of optical measurements 200 according to the method of the invention, except that the Figure 4 In addition to the first pair of same spot measurements 201a, 201b and the first 2D image measurement 202 shown, the second pair of same spot measurements 203a, 203b and the second 2D image measurement 204 are used to determine at least one of the brightness, color point and spectral distribution of the second type of emitted light, such as green light, and the brightness and color point distribution of the entire light emitting area of ​​the activated display (not shown). Those skilled in the art will understand that the measurements in the second pair of spot measurements 203a, 203b are the same because they are performed with the same settings.

[0091] The third spot measurement 203a in the second pair of same spot measurements 203a, 203b is performed during the fourth time interval T4, thereby obtaining the fourth measurement result S3 in the measurement result set. The fourth spot measurement 203b in the second pair of same spot measurements 203a, 203b is performed during the fifth time interval T5, thereby obtaining the fourth measurement result S4 in the measurement result set. In addition, as an example, a red optical filter is also used as the second optical filter of the second type during the sixth time interval T6 to perform the second 2D image measurement 204, thereby obtaining the third measurement result B in the measurement result set.

[0092] Those skilled in the art will appreciate that the second light spot-2D-spot measurement sequence described above can be performed for any specified color, such as red, green, blue, or any mixture of these colors. In the case of performing the second 2D image measurement 204 using a green optical filter, a test image (not shown) can be displayed on an activated display (not shown) so that the entire light emitting area of ​​the activated display emits green light. Then, as an example, by performing the second light spot-2D-spot measurement sequence, the brightness, color point, and spectral distribution of the emitted green light, as well as at least one of the brightness and color point distribution over the entire light emitting area of ​​the activated display can be determined. Those skilled in the art will appreciate that any suitable test image containing any color and / or pattern can be used.

[0093] like Figure 5 As shown, the fourth time interval T4, the fifth time interval T5 and the sixth time interval T6 of the second pair of same spot measurements 203a, 203b and the second 2D image measurement 204 do not overlap with each other, nor do they overlap with the first time interval T1, the second time interval T2 and the third time interval T3 of the first pair of same spot measurements 201a, 201b and the first 2D image measurement 202. In addition, the fourth time interval T4 and the fifth time interval T5 are relative to the center T of the sixth time interval T6. center It is mirrored.

[0094] Through Figure 5Arranging the fourth time interval T4, the fifth time interval T5, and the sixth time interval T6 in the manner shown can improve the comparability of the fourth measurement result S3 and the fifth measurement result S4 in the measurement result set by time averaging the fourth measurement result S3 and the fifth measurement result S4 as described above. Due to the time averaging, the influence of the change in the performance of the optical characteristic of interest occurring during and / or between the measurement of the second pair of same light spot measurements 203a, 203b on the fourth measurement result S3 and the fifth measurement result S4 can be reduced or, ideally, eliminated. Since the comparability of the measurement results S3 and S4 of the second pair of same light spot measurements 203a, 203b is improved, the measurement accuracy of determining the optical characteristic value of interest, such as brightness, color point, and spectral distribution, based on the fourth measurement result S3 and the fifth measurement result S4 can be improved.

[0095] In addition, due to the above time averaging, the fourth measurement result S3 and the fifth measurement result S4 in the measurement result set are actually at the center T of the sixth time interval T6. center The fourth measurement result S3, the fifth measurement result S4 and the sixth measurement result B in the measurement result set are obtained at the same time, and the second 2D image measurement is performed within the sixth time interval to obtain the sixth measurement result B in the measurement result set. Thereby, the comparability of the fourth measurement result S3, the fifth measurement result S4 and the sixth measurement result B in the measurement result set is improved. Since the fourth measurement result S3, the fifth measurement result S4 and the sixth measurement result B in the measurement result set are actually obtained at the same time, it is difficult or theoretically not affected by the change in the performance of the optical characteristic of interest that occurs during and / or between the measurement of the second pair of the same light spot measurement 203a, 203b and the second 2D image measurement 204 on the activated display (not shown). The measurement accuracy of determining the optical characteristic value of interest based on the fourth measurement result S3, the fifth measurement result S4 and the sixth measurement result B in the measurement result set is improved. Therefore, the method according to the present invention can accurately determine the optical characteristic value of the activated display.

[0096] Furthermore, the method according to the present invention can allow the x and y chromaticity coordinates according to the CIE 1931 xy chromaticity diagram to be determined with an accuracy of less than 0.002 using the values ​​determined based on the fourth measurement result S3, the fifth measurement result S4, and the sixth measurement result B. In this way, the method according to the present invention can detect deviations in at least one of the brightness, color point, and spectral distribution of the activated display, which deviations are not visible to the human eye, because the sensitivity threshold of the human eye for deviations in any of the above optical characteristics is 0.002.

[0097] Figure 6 A schematic diagram showing an exemplary, non-limiting sixth embodiment of the configuration of a series of optical measurements 200 according to the method of the invention, except that the Figure 4A first pair of identical spot measurements 201a, 201b and a first 2D image measurement 202 are shown, and Figure 5 In addition to the second pair of same spot measurements 203a, 203b and the second 2D image measurement 204 shown, a third pair of same spot measurements 205a, 205b and a third 2D image measurement 206 are used to determine at least one of the brightness, color point and spectral distribution of a third type of emitted light, such as blue light, and the brightness and color point distribution of the entire light emitting area of ​​an activated display (not shown). Those skilled in the art will understand that the measurements in the third pair of spot measurements 205a, 205b are the same because they are performed with the same settings.

[0098] The fifth spot measurement 205a in the third pair of same spot measurements 205a, 205b is performed during the seventh time interval T7, thereby obtaining the seventh measurement result S5 in the measurement result set. The sixth spot measurement 205b in the third pair of same spot measurements 205a, 205b is performed during the eighth time interval T8, thereby obtaining the seventh measurement result S6 in the measurement result set. In addition, as an example, a blue optical filter is also used as a third optical filter of the third type to perform the third 2D image measurement 206 during the ninth time interval T9, thereby obtaining the third measurement result C in the measurement result set.

[0099] Those skilled in the art will appreciate that the third light spot-2D-spot measurement sequence described above can be performed for any specified color, such as red, green, blue, or any mixture of these colors. In the case of performing the third 2D image measurement 206 using a blue optical filter, a test image (not shown) can be displayed on an activated display (not shown) so that the entire light emitting area of ​​the activated display emits blue light. Then, as an example, by performing the third light spot-2D-spot measurement sequence, the brightness, color point, and spectral distribution of the emitted blue light, as well as at least one of the brightness and color point distribution over the entire light emitting area of ​​the activated display can be determined. Those skilled in the art will appreciate that any suitable test image containing any color and / or pattern can be used.

[0100] like Figure 6As shown, the seventh time interval T7, the eighth time interval T8 and the ninth time interval T9 of the third pair of same spot measurements 205a, 205b and the third 2D image measurement 206 do not overlap with each other, nor do they overlap with the first time interval T1, the second time interval T2 and the third time interval T3 of the first pair of same spot measurements 201a, 201b and the first 2D image measurement 202, and any of the fourth time interval T4, the fifth time interval T5 and the sixth time interval T6 of the second pair of same spot measurements 203a, 203b and the second 2D image measurement 204. In addition, the seventh time interval T7 and the eighth time interval T8 are located relative to the center T of the ninth time interval T9. center It is mirrored.

[0101] Through Figure 6 Arranging the seventh time interval T7, the eighth time interval T8, and the ninth time interval T9 in the manner shown can improve the comparability of the seventh measurement result S5 and the eighth measurement result S6 in the measurement result set by time averaging the seventh measurement result S5 and the eighth measurement result S6 as described above. Due to the time averaging, the effect of the performance change of the optical characteristic of interest occurring during and / or between the measurements of the third pair of same light spot measurements 205a, 205b on the seventh measurement result S5 and the eighth measurement result S6 can be reduced or, ideally, eliminated. Since the comparability of the measurement results S5 and S6 of the third pair of same light spot measurements 205a, 205b is improved, the measurement accuracy of determining the optical characteristic value of interest, such as brightness, color point, and spectral distribution, based on the seventh measurement result S5 and the eighth measurement result S6 can be improved.

[0102] In addition, due to the above time averaging, the seventh measurement result S5 and the eighth measurement result S6 in the measurement result set are actually at the center T of the ninth time interval T9. center The third 2D image measurement is performed within the ninth time interval to obtain the ninth measurement result C in the measurement result set. Thus, the comparability of the seventh measurement result S5, the eighth measurement result S6 and the ninth measurement result C in the measurement result set is improved. Since the seventh measurement result S5, the eighth measurement result S6 and the ninth measurement result C in the measurement result set are actually obtained at the same time, it is difficult or theoretically not affected by the change in the performance of the optical characteristic of interest that occurs during and / or between the measurement of the third pair of the same light spot measurement 205a, 205b and the third 2D image measurement 206 on the activated display (not shown). The measurement accuracy of determining the optical characteristic value of interest based on the seventh measurement result S5, the eighth measurement result S6 and the ninth measurement result C in the measurement result set is improved. Therefore, the method according to the present invention can accurately determine the optical characteristic value of the activated display.

[0103] Furthermore, the method according to the present invention can allow the x and y chromaticity coordinates according to the CIE 1931 xy chromaticity diagram to be determined with an accuracy of less than 0.002 using the values ​​determined based on the seventh measurement result S5, the eighth measurement result S6 and the ninth measurement result C. In this way, the method according to the present invention can detect deviations in at least one of the brightness, color point and spectral distribution of the activated display, which deviations are not visible to the human eye, because the sensitivity threshold of the human eye for deviations in any of the above optical properties is 0.002.

[0104] Figure 7 A schematic top view of an exemplary, non-limiting first embodiment of an optical measurement device 300 according to the present invention is shown. According to the first embodiment, the optical measurement device 300 comprises: a 2D imaging system 301 configured and arranged to allow a series of optical measurements to be performed on an activated display (not shown), and a spot measurement system 302 configured and arranged to allow a series of spot measurements to be performed on an activated display. The 2D imaging system 301 comprises a camera 304 and an optical filter group 303 having at least one optical filter, such as at least one of a red, green, and blue optical filter.

[0105] In addition, the optical measurement device 300 includes a processing unit 305, which includes a storage unit 306 with computer instructions. The processing unit 305 is operably connected to the 2D image system 301 and the spot measurement system 302, and is used to receive the measurement results of the optical characteristics of the activated display in the storage unit 306, wherein when the computer instructions are run on the measurement results, the computer instructions will perform the steps of the method according to the present invention to determine the optical characteristic value with improved accuracy based on the measurement results.

[0106] The optical measurement device 300 according to the present invention can quickly determine the x and y chromaticity coordinates of the optical properties of interest, such as brightness, color point or spectral distribution, of an activated display with an accuracy of less than 0.002. Therefore, the optical measurement device 300 according to the present invention can reduce the impact of online optical testing, that is, testing the optical properties of an activated display installed in an actual display device on the production line, on the throughput of the production line. Therefore, the optical measurement device according to the present invention makes online optical testing a viable option.

[0107] Those skilled in the art will appreciate that the 2D imaging system 301 and the spot measurement system 302 may be independent systems, but they may also be integrated into a combined system, such as the ATLAS and Titan series provided by ADMESY.

[0108] Figure 8 1 is a schematic top view of an exemplary, non-limiting second embodiment of an optical measurement device 300 according to the present invention. The 2D image system 301 includes a beam splitter 307, which is configured and arranged to perform spot measurement and 2D image measurement on an activated display simultaneously. In this way, the optical measurement device 300 according to the present invention allows to determine the x and y chromaticity coordinates of the activated display of interest, such as at least one of brightness, color point and spectral distribution, according to the CIE 1931 xy chromaticity diagram with an accuracy of less than 0.002 in a more time-saving manner. As a result, the optical measurement device 300 according to the present invention can further reduce the impact of online optical testing on production line throughput.

[0109] The invention can be summarized as relating to a method for performing a series of optical measurements 100 on an activated display, whether or not the display has been mounted on an actual display device, wherein the performance of an optical characteristic of the activated display changes during and / or between the series of optical measurements, the series of optical measurements being configured as a measurement sequence comprising a pair of identical 2D image measurements or a pair of identical spot measurements combined with 2D image measurements, in order to determine with improved accuracy the brightness, color point and spectral distribution of the emitted light, as well as the distribution of the brightness and color point over the entire luminous area of ​​the activated display. The invention also relates to an optical measurement device 300 for performing the series of optical measurements 100 according to the method of the invention.

[0110] It will be apparent to those skilled in the art that the scope of the present invention is not limited to the examples discussed above, and that several modifications and amendments may be made thereto without departing from the scope of the present invention as defined in the appended claims. In particular, the specific features of the different aspects of the present invention may be combined. An aspect of the present invention may be further advantageously enhanced by adding features related to another aspect of the present invention. Although the present invention is illustrated and described in detail in the drawings and the specification, such illustration and description should be considered to be merely illustrative or exemplary, and not restrictive.

[0111] The present invention is not limited to the disclosed embodiments. Variations on the disclosed embodiments may be understood and implemented by those skilled in the art in practicing the claimed invention by studying the drawings, the specification and the appended claims. In the claims, the word "comprising" does not exclude other steps or elements, and the indefinite article "a" or "an" does not exclude a plurality. The fact that certain measures are set forth in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. Any reference numerals in the claims should not be construed as limiting the scope of the invention.

[0112] Reference Numbers

[0113] 100 optical measurements including 2D image measurements

[0114] 101a The first 2D image measurement in the first pair of identical 2D image measurements

[0115] 101b The second 2D image measurement in the first pair of identical 2D image measurements

[0116] 102a The third 2D image measurement in the second pair of identical 2D image measurements

[0117] 102b The fourth 2D image measurement in the second pair of identical 2D image measurements

[0118] 103a The fifth 2D image measurement in the third pair of identical 2D image measurements

[0119] 103b The sixth 2D image measurement in the third pair of identical 2D image measurements

[0120] 200 optical measurements including 2D image measurement and spot measurement

[0121] 201a The first spot measurement in the first pair of identical spot measurements

[0122] 201b The second spot measurement in the first pair of identical spot measurements

[0123] 202 First 2D Image Measurement

[0124] 203a The third 2D image measurement in the second pair of identical 2D image measurements

[0125] 203b The fourth 2D image measurement in the second pair of identical 2D image measurements

[0126] 204 Second 2D Image Measurement

[0127] 205a The fifth 2D image measurement in the third pair of identical 2D image measurements

[0128] 205b The sixth 2D image measurement in the third pair of identical 2D image measurements

[0129] 206 Third 2D Image Measurement

[0130] A1 The first measurement result of the first 2D image measurement in the first pair of identical 2D image measurements

[0131] A2 The second measurement result of the second 2D image measurement in the first pair of identical 2D image measurements

[0132] B1 The third measurement result of the third 2D image measurement in the second pair of the same 2D image measurement

[0133] B2 The fourth measurement result of the fourth 2D image measurement in the second pair of the same 2D image measurement

[0134] C1 The third measurement result of the third 2D image measurement in the second pair of the same 2D image measurement

[0135] C2 The fourth measurement result of the fourth 2D image measurement in the second pair of the same 2D image measurement

[0136] S1 The first measurement result of the first spot measurement in the first pair of identical spot measurements

[0137] S2 The second measurement result of the second spot measurement in the first pair of same spot measurements

[0138] A The third measurement result of the first 2D image measurement in the first light spot-2D light spot measurement sequence

[0139] S3 The fourth measurement result of the third spot measurement in the second pair of same spot measurements

[0140] S4 The fifth measurement result of the fourth spot measurement in the second pair of identical spot measurements

[0141] B The sixth measurement result of the second 2D image measurement in the second light spot-2D light spot measurement sequence

[0142] S5 The seventh measurement result of the fifth spot measurement in the third pair of identical spot measurements

[0143] S6 The eighth measurement result of the sixth spot measurement in the third pair of identical spot measurements

[0144] C The ninth measurement result of the third 2D image measurement in the third light spot-2D light spot measurement sequence

[0145] T1 first time interval

[0146] T2 second time interval

[0147] T3 Third time interval

[0148] T4 Fourth time interval

[0149] T5 Fifth time interval

[0150] T6 Sixth time interval

[0151] T7 Seventh Time Interval

[0152] T8 Eighth Time Interval

[0153] T9 Ninth Time Interval

[0154] T center Time interval center

[0155] T total Total time interval

[0156] 300 optical measuring device

[0157] 3012D Image System

[0158] 302 spot measurement system

[0159] 303 filter group

[0160] 304 Camera

[0161] 305 Processing Unit

[0162] 306 Storage Unit

[0163] 307 Splitter

Claims

1. A method for performing a series of optical measurements (100) using a 2D imaging system (301) on an activated display, the properties of an optical characteristic of the activated display changing during and / or between the series of optical measurements (100), wherein: The comparability of the optical property values ​​determined based on the measurement results of the optical property obtained by performing the series of optical measurements (100) is improved, the method comprising: configuring the 2D imaging system (301) to perform each optical measurement in the series of optical measurements (100) as a measurement sequence, so as to obtain a set of measurement results of a corresponding optical property for each optical measurement; and determining a respective optical property value for each optical measurement of the series of optical measurements (100) by performing a time averaging of the measurement results of the respective set of measurement results of the respective optical measurement; The 2D imaging system (301) is configured to perform each optical measurement in the series of optical measurements (100) as a measurement sequence so as to obtain a set of measurement results of a corresponding optical characteristic for each optical measurement, comprising: determining a total time interval for performing the series of optical measurements (100) by adding the respective time intervals for performing each respective optical measurement in the series of optical measurements; configuring the measurement sequence to include at least one pair of identical 2D image measurements (101a, 101b; 102a, 102b; 103a, 103b), wherein a first 2D image measurement (101a) of a first pair of identical 2D image measurements (101a, 101b) is performed during a first time interval using a first optical filter of a first type to obtain a first measurement result of the set of measurement results, and a second 2D image measurement (101b) of the first pair of identical 2D image measurements (101a, 101b) is performed during a second time interval using a first optical filter of the first type to obtain a second measurement result of the set of measurement results, wherein the first time interval and the second time interval are non-overlapping and are mirrored with respect to a center of the total time interval; wherein the measurement sequence is configured to include a second pair of identical 2D image measurements (102a, 102b), wherein a third 2D image measurement (102a) in the second pair of identical 2D image measurements (102a, 102b) is performed using a second optical filter of a second type during a third time interval to obtain a third measurement result in the set of measurement results, and a fourth 2D image measurement (102b) in the second pair of identical 2D image measurements (102a, 102b) is performed using a second optical filter of the second type during a fourth time interval to obtain a fourth measurement result in the set of measurement results, wherein the third time interval and the fourth time interval of the second pair of identical 2D image measurements (102a, 102b) do not overlap with each other or with the first time interval and the second time interval of the first pair of identical 2D image measurements (101a, 101b), and wherein the third time interval and the fourth time interval of the second pair of identical 2D image measurements are also mirrored relative to a center of the total time interval.

2. The method according to claim 1, wherein: The measurement sequence is configured to include a third pair of identical 2D image measurements (103a, 103b), wherein a fifth 2D image measurement (103a) of the third pair of identical 2D image measurements (103a, 103b) is performed during a fifth time interval using a third optical filter of a third type to obtain a fifth measurement result of the set of measurement results, and a sixth 2D image measurement (103b) of the third pair of identical 2D image measurements (103a, 103b) is performed during a sixth time interval using a third optical filter of the third type to obtain a fifth measurement result of the set of measurement results. A sixth measurement result, wherein the fifth time interval and the sixth time interval in the third pair of same 2D image measurements (103a, 103b) do not overlap with each other, nor do they overlap with the first time interval and the second time interval in the first pair of same 2D image measurements (101a, 101b), and the third time interval and the fourth time interval in the second pair of same 2D image measurements (102a, 102b), and wherein the fifth time interval and the sixth time interval in the third pair of same 2D image measurements are also mirrored relative to the center of the total time interval.

3. A method for performing a series of optical measurements (200) on an activated display, the performance of an optical characteristic of the activated display changing during and / or between the series of optical measurements, the series of optical measurements being configured as a measurement sequence comprising a pair of identical light spot measurements combined with 2D image measurements in order to determine with improved accuracy the brightness, color point and spectral distribution of the emitted light, and at least one of the brightness and color point distribution over the entire light emitting area of ​​the activated display, wherein A first spot measurement (201a) in a first pair of same spot measurements (201a, 201b) is performed during a first time interval (T1) to obtain a first measurement result (S1) in a set of measurement results, a second spot measurement (201b) in the first pair of same spot measurements (201a, 201b) is performed during a second time interval (T2) to obtain a second measurement result (S2) in the set of measurement results, and a first 2D image measurement (202) is performed during a third time interval (T3) using an optical filter of a first type to obtain a third measurement result (A) in the set of measurement results, wherein the first time interval (T1), the second time interval (T2) and the third time interval (T3) are non-overlapping, wherein the first time interval (T1) and the second time interval (T2) are mirrored relative to a center of the third time interval (T3), and wherein time averaging is performed on the first measurement result (S1) and the second measurement result (S2).

4. The method according to claim 3, wherein the measurement sequence (200) is configured to include a second pair of same spot measurements (203a, 203b) and a second 2D image measurement (204), wherein: The third spot measurement (203a) in the second pair of same spot measurements (203a, 203b) is performed during a fourth time interval (T4) to obtain a fourth measurement result (S3) in the set of measurement results, the fourth spot measurement (203b) in the second pair of same spot measurements (203a, 203b) is performed during a fifth time interval (T5) to obtain a fifth measurement result (S4) in the set of measurement results, and the second 2D image measurement (204) is performed during a sixth time interval (T6) using an optical filter of a second type to obtain a sixth measurement result (B) in the set of measurement results, wherein the second pair of same spot measurements (203a, 203b) is performed during a fifth time interval (T5) to obtain a fifth measurement result (S4) in the set of measurement results. 3b) and the fourth time interval (T4), the fifth time interval (T5) and the sixth time interval (T6) of the second 2D image measurement (204) do not overlap, respectively, and do not overlap with the first time interval (T1), the second time interval (T2) and the third time interval (T3) of the first pair of same-spot measurements (201a, 201b) and the first 2D image measurement (202), respectively, and wherein the fourth time interval (T4) and the fifth time interval (T5) are mirror images relative to the center of the sixth time interval (T6), and wherein time averaging is performed on the fourth measurement result (S3) and the fifth measurement result (S4).

5. The method according to claim 4, wherein the measurement sequence is configured to include a third pair of same spot measurements (205a, 205b) and a third 2D image measurement (206), wherein: The fifth light spot measurement (205a) in the third pair of same light spot measurements (205a, 205b) is performed during a seventh time interval (T7) to obtain a seventh measurement result (S5) in the set of measurement results, the sixth light spot measurement (205b) in the third pair of same light spot measurements (205a, 205b) is performed during an eighth time interval (T8) to obtain an eighth measurement result (S6) in the set of measurement results, and the third 2D image measurement (206) is performed during a ninth time interval (T9) using a third optical filter of a third type to obtain a ninth measurement result (C) in the set of measurement results, wherein the seventh time interval (T7) and the eighth time interval (T8) of the third pair of same light spot measurements (205a, 205b) and the third 2D image measurement (206) are performed during a ninth time interval (T9) using a third optical filter of a third type. 8) and the ninth time interval (T9) neither overlap with each other, nor overlap with the first time interval (T1), the second time interval (T2) and the third time interval (T3) of the first pair of same-spot measurements (201a, 201b) and the first 2D image measurement (202), and any of the fourth time interval (T4), the fifth time interval (T5) and the sixth time interval (T6) of the second pair of same-spot measurements (203a, 203b) and the second 2D image measurement (204), and wherein the seventh time interval (T7) and the eighth time interval (T8) are mirror images relative to the center of the ninth time interval (T9), and wherein time averaging is performed on the seventh measurement result (S5) and the eighth measurement result (S6).

6. The method according to any one of claims 3 to 5, wherein: The optical property of the activated optical display is one of brightness, color point and spectral distribution, and wherein an x ​​chromaticity coordinate and a y chromaticity coordinate according to a CIE 1931 xy chromaticity diagram are determined for one of the brightness, color point and spectral distribution with a raised accuracy of less than 0.002 using a value determined by performing a time average of measurement results of a corresponding set of measurement results.

7. An optical measurement device (300) for performing a series of optical measurements (100) on an activated display, the display having optical properties that vary in performance during and / or between measurements of the series of optical measurements, wherein: For the optical characteristic value determined based on the measurement result of the optical characteristic obtained by performing the series of optical measurements, the accuracy is improved, and the optical measurement device (300) comprises: a 2D image system (301) configured and arranged to allow a series of optical 2D image measurements to be performed on the activated display; a spot measurement system (302) configured and arranged to allow a series of spot measurements to be performed on the activated display; and A processing unit (305) comprising a storage unit (306) having computer instructions, the processing unit being operably connected to the 2D imaging system (301) and the light spot measurement system (302), and configured to receive in the storage unit (306) measurement results of optical characteristics of the activated display, wherein when the computer instructions are run on the measurement results, the steps of the method according to any of the preceding claims are performed to determine an optical characteristic value with improved accuracy based on the measurement results.

8. The optical measuring device (300) according to claim 7, wherein: The 2D imaging system (301) comprises a beam splitter (307) configured and arranged to simultaneously perform spot measurement and 2D image measurement on the activated display.

Images