CN115810316A - Display device and measuring method thereof - Google Patents
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Abstract
The invention discloses a display device and a measuring method thereof. The image control unit is used for sequentially outputting a plurality of groups of image signals; the display unit is used for displaying a plurality of groups of images according to the plurality of groups of image signals, and each group of images comprises a first gray-scale image and a second gray-scale image; the photoelectric measurement module continuously measures the brightness value of the display unit and converts the brightness value into a corresponding voltage signal in the dynamic process that the display unit displays the first gray-scale image and switches to the second gray-scale image; the processing unit continuously reads the voltage signal generated by the photoelectric measurement module until the second gray-scale image reaches a stable state, defines the first voltage signal corresponding to the first gray-scale image before switching, defines the second voltage signal corresponding to the second gray-scale image before switching, and calculates the delay time between the first voltage signal and the second voltage signal. The display device of the invention can measure the pixel reaction time.
Description
Technical Field
The present invention relates to a display device and a measuring method thereof, and more particularly, to a display device capable of measuring a pixel response time by itself and a measuring method thereof.
Background
When the liquid crystal display displays a dynamic image, the liquid crystal display needs a response time to generate a motion blur (motion blur) phenomenon, so that a user can feel the problems of the dynamic image such as unclear or color deviation. In order to determine the sharpness of the lcd, a measuring tool is usually used in the prior art. However, the external measuring tool is expensive and cumbersome to operate, and is rarely used by general consumers. Meanwhile, the liquid crystal display has different pixel response times due to aging of liquid crystal, temperature variation, etc., so that consumers cannot know the current performance of the display.
Disclosure of Invention
The present invention is directed to a display device and a measuring method thereof to solve the above problems.
In order to achieve the above object, the present invention provides a display device, which includes an image control unit, a display unit, a photoelectric measurement module, and a processing unit. The image control unit is used for sequentially outputting a plurality of groups of image signals, and each group of image signals comprises a first image signal and a second image signal with different gray scales; the display unit is in communication connection with the image control unit and is used for receiving the multiple groups of image signals and displaying multiple groups of images according to the multiple groups of image signals, and each group of images comprises a first gray-scale image corresponding to the first image signal and a second gray-scale image corresponding to the second image signal; the photoelectric measurement module continuously measures the brightness value of the display unit and converts the brightness value into a corresponding voltage signal in the dynamic process that the display unit displays the first gray-scale image and switches to the second gray-scale image; the processing unit continuously reads the voltage signal generated by the photoelectric measuring module until the second gray-scale image is in a stable state, defines the first voltage signal corresponding to the first gray-scale image before switching, defines the second voltage signal corresponding to the second gray-scale image before switching, and calculates the delay time between the first voltage signal and the second voltage signal.
As an optional technical solution, the processing unit includes a timer to record the voltage signal read at each time, and form a voltage signal-time relation table, and the processing unit calculates a time difference between a change from the first voltage signal in a steady state to the second voltage signal in a steady state in the voltage signal-time relation table as the delay time.
As an optional technical solution, the display unit displays each group of images at different usage times or different usage temperatures, and the processing unit obtains a delay time corresponding to each group of images as an actual pixel response time corresponding to each group of images to form at least one actual pixel response time table.
As an optional technical solution, the processing unit forms at least one corresponding overdrive lookup table according to the at least one actual pixel response time table and the at least one target pixel response time.
As an optional technical solution, the display device further comprises a storage unit, wherein the storage unit stores the at least one actual pixel response time table and the at least one overdrive lookup table corresponding to different use times and different use temperatures; when the overdrive look-up table is used, the display unit displays a user interface so as to apply the overdrive look-up table after inputting at least one parameter.
As an optional technical solution, the display device further comprises a temperature sensor attached to the display unit, wherein the temperature sensor is used for sensing the temperature of the display unit, so as to obtain at least one actual pixel reaction time table at different use temperatures.
As an optional technical solution, the photoelectric measurement module further includes an operational amplifier, and the operational amplifier is used for adjusting the voltage gain and the offset of the photoelectric measurement module, so that the voltage signals obtained by the photoelectric measurement module are all in a linear working range.
In addition, the invention also provides a measuring method of the display device, wherein the display device comprises an image control unit, a display unit, a photoelectric measuring module and a processing unit; the method for measuring the optical characteristic of the optical fiber comprises the steps of,
step A, the image control unit sequentially outputs a plurality of groups of image signals, wherein each group of image signals comprises a first image signal and a second image signal with different gray scales;
step B, the display unit displays a plurality of groups of images according to the plurality of groups of image signals, wherein each group of images comprises a first gray-scale image corresponding to the first image signal and a second gray-scale image corresponding to the second image signal;
step C, the photoelectric measurement module continuously measures the brightness value of the display unit and converts the brightness value into a corresponding voltage signal in the dynamic process that the display unit displays the first gray-scale image and switches to the second gray-scale image; and
and step D, the processing unit continuously reads the voltage signal generated by the photoelectric measurement module until the second gray-scale image reaches a stable state, defines a first voltage signal corresponding to the first gray-scale image before switching, defines a second voltage signal corresponding to the second gray-scale image before switching, and calculates the delay time between the first voltage signal and the second voltage signal.
As an optional technical solution, the measuring method further includes, in different usage times or different usage temperatures, executing step a to step D in a loop, and the processing unit obtains the delay time corresponding to each group of images as the actual pixel response time corresponding to each group of images to form at least one actual pixel response time table.
As an optional technical solution, the measuring method further includes that the processing unit forms at least one corresponding overdrive lookup table according to the at least one actual pixel response time table and the at least one target pixel response time.
The display device and the measuring method thereof do not need expensive external equipment and complicated operation steps, can realize the measurement of the actual pixel reaction time through software and hardware of the display device, and are convenient for users to know the performance of the display device. Convenient operation and low cost. Further, it can be applied to the measured actual pixel response time.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Drawings
FIG. 1 is a schematic perspective view of a display device according to the present invention;
FIG. 2 is a block diagram of a display device according to the present invention;
FIG. 3 is a schematic diagram of a measurement method of the present invention;
FIG. 4 is another schematic diagram of the measurement method of the present invention.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
FIG. 1 is a schematic perspective view of a display device according to the present invention; fig. 2 is a block diagram of a display device according to the present invention. The display device 1000 of the present invention includes an image control unit 100, a display unit 200, an optoelectronic measurement module 300, and a processing unit 400. The image control unit 100 is configured to sequentially output a plurality of sets of image signals, each set of image signals including a first image signal and a second image signal with different gray scales. The display unit 200 is communicatively connected to the image control unit 100, and the display unit 200 is configured to receive the plurality of sets of image signals and display a plurality of sets of grayscale images according to the plurality of sets of image signals, where each set of grayscale image includes a first grayscale image and a second grayscale image with different grayscale values, where the first grayscale image corresponds to the first image signal and the second grayscale image corresponds to the second image signal. The photoelectric measurement module 300 is configured to continuously measure the luminance value of the display unit 200 and convert the luminance value into a corresponding voltage signal in a dynamic process of displaying the first gray scale image and switching the display unit 200 to the second gray scale image. The processing unit 400 continues to read the voltage signal generated by the photoelectric measuring module 300 until the second gray-scale image reaches a steady state. Before the switching operation of the display unit 200 from the first gray scale image to the second gray scale image, the first gray scale image is defined to correspond to the first voltage signal V1, the second gray scale image is defined to correspond to the second voltage signal V2, and the delay time between the first voltage signal V1 and the second voltage signal V2 is calculated. As shown in fig. 2, in the present embodiment, the image control unit 100 is communicatively connected to the display unit 200 and the processing unit 400, and the photoelectric measurement module 300 is also communicatively connected to the processing unit 400.
In practical operation, the process of the display unit 200 receiving a set of image signals (including a first image signal and a second image signal) for displaying can be divided into a plurality of stages, which specifically include:
(1) Stage one, the image control unit 100 outputs a first image signal to the display unit 200;
(2) And in the second stage, the display unit 200 receives the first image signal and then switches the current display picture to the first gray-scale image according to the first image signal, wherein the switching process is a dynamic process until the display unit 200 displays the first gray-scale image in a stable state. In this process, the photoelectric measuring module 300 continuously detects the brightness of the display unit 200 and converts it into a voltage signal. When the display unit 200 displays the first gray-scale image in a steady state, the brightness values detected by the photoelectric measurement module 300 are equal, which is the first voltage signal V1.
(3) Stage three, the image control unit 100 switches from outputting the first image signal to outputting the second image signal to the display unit 200, that is, the image control unit 100 first outputs the first image signal to the display unit 200, and then outputs the second image signal to the display unit 200;
(4) And step four, the display unit 200 receives the second image signal, switches the currently displayed first gray scale image to the second gray scale image according to the second image signal, and the switching process is a dynamic process until the display unit 200 displays the stable second gray scale image. In this process, the photoelectric measuring module 300 continuously detects the brightness of the display unit 200 and converts it into a voltage signal. The second gray scale image in the switching process is in a transient state, the voltage signals obtained in the switching process are all changed until the second gray scale image reaches a steady state, and the obtained voltage signals are not changed any more, namely the second voltage signals V2. The processing unit 400 continuously reads the voltage signal detected by the photoelectric measurement module 300 in the whole process, and determines the delay time from the first voltage signal V1 to the second voltage signal V2, which becomes stable, as the actual pixel response time RT1 for switching from the first gray-scale image to the second gray-scale image.
In practical applications, since the processing unit 400 continuously reads the voltage signals detected by the photoelectric measurement module 300 during the whole switching process, the processing unit 400 may include a timer for recording the read voltage signals at each time and forming a voltage signal-time relationship table. The processing unit 400 calculates a time difference between the change from the first voltage signal V1 in the steady state to the second voltage signal V2 in the steady state as a delay time, i.e., an actual pixel reaction time.
(5) At stage five, the display unit 200 displays the second gray scale image in a stable state. In this process, the optical-electrical measuring module 300 selectively and continuously detects the brightness of the display unit 200 and converts the brightness into a voltage signal, and the processing unit 400 selectively and continuously reads the voltage signal.
For example, the first gray image has a gray scale value of 128, and the second gray image has a gray scale value of 144. Then, when the display unit 200 displays a first gray-scale image (with a gray-scale value of 128) in a steady state, the optical-electrical measuring module 300 detects the brightness value of the display unit 200 and converts it into a first voltage signal V1; when the display unit 200 switches from the first gray-scale image to the second gray-scale image (with a gray-scale value of 144), the photoelectric measurement module 300 continuously detects the brightness value of the display unit 200 and converts the brightness value into a voltage signal until the display unit 200 displays the second gray-scale image in a stable state, the processing unit 400 reads the second voltage signal V2 at this time, and calculates the delay time between the second voltage signal V2 and the first voltage signal V1, which can be regarded as the actual pixel response time for switching from the gray-scale image with a gray-scale value of 128 to the gray-scale image with a gray-scale value of 144.
From the voltage signal-time relationship table obtained by the processing unit 400, a first time t1 at which the first voltage signal V1 is located before the voltage signal changes is recorded, and then a second time t2 at which the voltage signal changes to the second voltage signal V2 in a steady state is recorded, where a time difference Δ t between the first time t1 and the second time t2 is an actual pixel response time between the first gray-scale image and the second gray-scale image.
In practice, the gray scale values of 0 to 255 are separated by unit gray scale, for example, 17 kinds of gray scale image signals are formed for every 16 gray scales, and the image signal with the gray scale value of 0, the image signal with the gray scale value of 16, the image signal with the gray scale value of 32, the image signal with the gray scale value of 48, \8230, and the image signal with the gray scale value of 255 are formed. Then, the multiple gray-scale image signals form multiple sets of image signals, and since the first gray-scale image has 17 gray-scale image signals and the second gray-scale image has 17 gray-scale image signals, 17 × 17=289 sets of image signals can be formed. For example, the first image signal is an image signal with a gray scale value of 0, and the second image signal is an image signal with a gray scale value of 16; the first image signal is an image signal with a gray scale value of 32, the second image signal is an image signal with a gray scale value of 64, and so on. Then, the image control unit 100 transmits the corresponding first image signal and the second image signal to the display unit 200, the display unit 200 displays the corresponding first gray scale image and the corresponding second gray scale image, the photoelectric measurement module 300 senses the corresponding brightness and converts the brightness into the corresponding voltage signal, and the processing unit 400 continuously reads the corresponding voltage signal and calculates the corresponding response time to form the 17 × 17 actual pixel response time table shown in the following table 1. In practice, the gray scale values of 0-255 may be divided into other ways, not limited to the division of one group for every 16 gray scales.
TABLE 1
TABLE 1 (continuation)
In practical operation, a user can establish a plurality of actual pixel response time tables as shown in table 1 according to actual situations, for example, the liquid crystal display has different actual pixel response times due to aging of liquid crystal and temperature variation, and the user can correspond to the actual pixel response time tables of the display device 1000 with different service lives, measure the actual pixel response time tables corresponding to different temperature variations, and establish the corresponding actual pixel response time tables. Therefore, at different time or temperature, the display unit 200 can display each group of images sequentially, and the processing unit 400 obtains the delay time corresponding to each group of images as the actual pixel response time corresponding to each group of images to form at least one actual pixel response time table. The user can know the relationship between the use time, the use temperature and the actual pixel reaction time according to the at least one actual pixel reaction time table, and can perform subsequent adjustment operation according to the relationship.
In operation, the display device 1000 further comprises at least one temperature sensor 600, and the temperature sensor 600 is communicatively connected to the processing unit 400. The temperature sensor may be disposed behind the display unit 200 to record the temperature of the display unit 200, and the processing unit 400 may combine the temperature and the actual pixel response time obtained by the photoelectric measurement module 300 to know the relationship between the temperature of the display panel 200 and the actual pixel response time.
The display device 1000 of the invention does not need expensive external equipment and complex operation steps, can realize the measurement of the actual pixel reaction time through software and hardware of the display device 1000, and is convenient for users to know the performance of the display device 1000. Convenient operation and low cost. Further, it can be applied to the measured actual pixel response time. For example, the 17 × 17 actual pixel response time data is averaged and displayed on the display unit 200 for the user to observe.
In another application, the 17 × 17 actual pixel response time data may be used as an algorithm data source to generate the overdrive lookup table. Specifically, for example, the target pixel response time is 2ms, and the pixel response time of the part of the first grayscale image in table 1 is longer when switching to the second grayscale image, so that the problem of image motion blur is easily generated when displaying a moving image. Taking the gray scale value of the first gray scale image as 128 and the gray scale value of the second gray scale image as 144, for example, the difference between the two gray scale values is 16, and the actual pixel response time is 4.284ms. Within a specified target pixel response time (i.e., 2 ms), the gray scale value can only be converted to 128+ (144-128) × (2/4.284) =135.5, which is not satisfactory.
In order to improve this problem, the first gray scale image can be smoothly switched to the second gray scale image within the target pixel response time by means of Over Drive (OD). The overdrive technique is to reset the gray-scale value to be adjusted according to the ratio of the actual pixel response time to the target pixel response time in table 1, so as to ensure that the conversion of the target gray-scale value can be completed within the target pixel response time.
For example, the gray scale difference between the first gray scale image with a gray scale value of 128 and the second gray scale image with a gray scale value of 144 is 16. In the overdrive method, the gray scale value to be adjusted is adjusted from 16 to 16 × 4.284/2 =34.3 according to the actual pixel reaction time 4.284ms and the target pixel reaction time 2 ms. Then, the image control unit 100 may adjust the gray level value of the second gray level image from the original value 144 to 162.3 (i.e. 128+ 34.3) and provide the adjusted gray level value to the display unit 200 for displaying, so that the gray level value may be changed from 128 to 144 within the target pixel response time (2 ms).
In practical applications, after obtaining the actual pixel response time corresponding to the gray-scale value of each first/second gray-scale image as shown in table 1, the overdrive value from each first gray-scale image to the second gray-scale image can be determined according to each actual pixel response time and the target pixel response time, so as to form an overdrive lookup table (OD LUT) corresponding to table 1.
In operation, as shown in fig. 2, the display device 1000 further includes a storage unit 500, and the storage unit 500 may be communicatively connected to the processing unit 400 or integrated in the processing unit 400. The storage unit 500 may store at least one actual pixel response time table and at least one overdrive look-up table (OD LUT) corresponding to different use times and temperatures. When the image control unit 100 is going to output the image signal, the overdrive lookup table can be checked according to the gray-scale value of the previous frame image and the gray-scale value of the current frame image to adjust the gray-scale value of the output pixel, so as to accelerate the pixel response time and improve the display effect. Or, in use, the display unit 200 displays an On Screen Display (OSD) so as to apply the corresponding overdrive lookup table after inputting at least one parameter. Specifically, the display unit 200 may display an user interface (OSD), and the user interface (OSD) may have a plurality of target pixel response times, use temperatures, and other parameter selections, for example, a user selects one of the target pixel response times as an input parameter of the overdrive lookup table algorithm, and the processing unit 400 applies the corresponding overdrive lookup table in real time according to the target pixel response time selected by the user, so that the user can observe the visual representation of the dynamic image and select whether to use the dynamic image according to the visual representation. In practical operation, the image control unit 100 can control the display unit 200 to display the user interface. In an embodiment, since a plurality of different overdrive lookup tables can be stored in the display device 1000, the image control unit 100 can further control the display unit 200 to apply different overdrive lookup tables by regions, so as to display dynamic pictures with different response times in different regions of the display unit 200, so that a user can select and compare the dynamic pictures more intuitively.
In practice, the processing unit 400 may have an algorithm for generating the OD lookup table, and specifically, the processing unit 400 may generate a corresponding overdrive lookup table (OD LUT) by combining a plurality of sets of actual pixel response time tables of voltage signals between the first grayscale image and the second grayscale image with the target pixel response time, and store the corresponding actual pixel response time tables and overdrive lookup tables in the storage unit 500.
The display device 1000 of the present invention can realize the measurement of the actual pixel response time after the factory shipment by means of its own measurement module and processing unit. Because the display device 1000 relies on its own software and hardware, it is not necessary to use expensive external devices, and it is convenient for the user to operate. Furthermore, a corresponding overdrive look-up table (OD LUT) can be generated according to the measured data to accelerate the pixel response time, improve the problem of dynamic image blur, improve the display effect, and improve the user experience.
In practical operation, the photoelectric measurement module 300 further includes an operational amplifier (not shown) for adjusting the voltage gain and the bias voltage of the photoelectric measurement module 300, and the voltage signals between the first gray-scale image and the second gray-scale image obtained by the photoelectric measurement module 300 are all in the linear working range.
As shown in fig. 1, the display device 1000 further includes a first casing 201 and a first circuit board 202, the display unit 200 is located in the first casing 201, and the first circuit board 202 is electrically connected to the display unit 200. Meanwhile, the image control unit 100 and the processing unit 400 are disposed on the first circuit board 202, so that the image control unit 100 sequentially outputs a plurality of sets of the first image signal and the second image signal to the display unit 200. Further, the processing unit 400 and the image control unit 100 may be integrated into a processor.
In this embodiment, the photoelectric measurement module 300 includes a second housing 301, a second circuit board 302 and a photoelectric sensor 303, the photoelectric sensor 303 is disposed on the second circuit board 302, and the second circuit board 302 can be electrically connected to the first circuit board 202. The photo sensor 303 measures the brightness value of the display unit 200 and converts the brightness value into a voltage signal, and the processing unit 400 is coupled to the photo sensor 303 to read the voltage signal between the first gray-scale image and the second gray-scale image obtained by the photo sensor 303, so as to facilitate the subsequent calculation of the delay time between the first gray-scale image and the second gray-scale image. In another embodiment, the processing unit 400 and the photosensor 303 may be located on the second circuit board 302 at the same time, and further, the processing unit 400 and the photosensor 303 may be integrated into the same processor.
As shown in fig. 1, the display device 1000 has a first housing 201, a receiving groove may be disposed on the first housing 201, and the photoelectric measurement module 300 may be selectively located in the receiving groove. In the storage state, the photoelectric measurement module 300 is accommodated in the accommodating groove, so that the normal display of the display device 1000 is not affected. In the measurement state, the photoelectric measurement module 300 rotates out from the accommodation groove and is located in front of the display unit 200, so as to measure the brightness of the display unit 200. Further, the display device 1000 may further include a motor (not shown) connected to the optical measuring module 300. When the photoelectric measurement module 300 needs to be used, the motor drives the photoelectric measurement module 300 to rotate out of the accommodating groove and reach the target position; when the use is finished, the motor drives the photoelectric measurement module 300 to return to the containing slot. In actual operation, the display device 1000 is placed on a supporting surface (e.g. a table top, etc.), as shown in fig. 1, in the embodiment, the photoelectric measurement module 300 is located on a side of the display device 1000 adjacent to the supporting surface, which is not limited to the above.
In practice, in another embodiment, the optoelectronic measurement module 300 can be a detachable optoelectronic measurement module, which can include a first portion and a second portion (e.g., a third circuit board) that can be separated, wherein the optoelectronic sensor can be disposed on the first portion, and the second portion can be disposed on the housing of the display device 1000 and electrically connected to the main circuit board of the display device 1000 or the first circuit board 202. When the photoelectric measurement module 300 is needed, the first portion provided with the photoelectric sensor and the second portion are mechanically connected, and at this time, the first portion and the second portion can be electrically connected by virtue of circuit design, so that the display unit 200 can be measured; at the end of use, the first part is disassembled from the second part.
The invention further includes a measurement method of the display device 1000 shown in fig. 1 and fig. 2, please refer to fig. 3, and fig. 3 is a schematic diagram of the measurement method of the invention. The method for measuring the optical characteristic of the optical fiber comprises the steps of,
step a (S110), the image control unit 100 sequentially outputs a plurality of sets of image signals, each set of image signals including a first image signal and a second image signal having different gray scales;
step B (S120), the display unit 200 displays a plurality of sets of images according to the plurality of sets of image signals, each set of image including a first gray-scale image corresponding to the first image signal and a second gray-scale image corresponding to the second image signal;
step C (S130), the photoelectric measurement module 300 continuously measures the luminance value of the display unit 200 and converts the luminance value into a corresponding voltage signal in the dynamic process of displaying the first gray-scale image and switching to the second gray-scale image by the display unit 200;
step D (S140), the processing unit 400 continuously reads the voltage signal generated by the photoelectric measurement module 300 until the second gray-scale image reaches a stable state, defines the first voltage signal V1 corresponding to the first gray-scale image before switching, defines the second voltage signal V2 corresponding to the second gray-scale image before switching, and calculates the delay time between the first voltage signal V1 and the second voltage signal V2.
Further, the measuring method further includes performing steps a to D cyclically at different usage times or different usage temperatures, and the processing unit 400 obtains the delay time corresponding to each group of images as the actual pixel response time corresponding to each group of images to form at least one actual pixel response time table.
Further, the measuring method further includes that the processing unit 400 forms at least one corresponding overdrive lookup table according to the at least one actual pixel response time table and the at least one target pixel response time. The user can perform subsequent adjustment operations according to the at least one overdrive lookup table.
The present invention further includes another measuring method of the display device 1000 shown in fig. 1 and fig. 2, please refer to fig. 4, and fig. 4 is another schematic diagram of the measuring method of the present invention. The method for measuring the optical characteristic of the optical fiber comprises the steps of,
step a (S210), the image control unit 100 outputs a first image signal to the display unit 200;
step B (S220), the display unit 200 converts the image signal into a liquid crystal driving signal, and displays the first grayscale image to a stable state;
step C (S230), the image control unit 100 outputs a second image signal to the display unit 200;
step D (S240), the processing unit 400 continuously reads the voltage signal of the photoelectric measurement module 300 until the second gray-scale image reaches a steady state; and
in step E (S250), the processing unit 400 calculates a response time required for a change between the voltage signal corresponding to the first grayscale image and the voltage signal corresponding to the second grayscale image.
Further, the measuring method comprises the step of repeatedly executing the step A to the step E by using different first gray scale images and second gray scale images so as to obtain the response time corresponding to the different first gray scale images to the second gray scale images. In practice, the gray scale values of 0 to 255 are separated by unit gray scale, for example, 17 kinds of gray scale image signals are formed for every 16 gray scales, and the image signal with the gray scale value of 0, the image signal with the gray scale value of 16, the image signal with the gray scale value of 32, the image signal with the gray scale value of 48, \8230, and the image signal with the gray scale value of 255 are formed. Since the first gray-scale image and the second gray-scale image can be 17 kinds of gray-scale images, 17 × 17 gray-scale change response time data, that is, the actual pixel response time table shown in table 1 can be formed.
In one embodiment, the 17 × 17 response time data may be averaged and displayed on the display unit 200 for the user to observe. In another embodiment, the 17 × 17 response time data may be used as an algorithm data source to generate the overdrive lookup table.
The display device and the measuring method thereof can measure the pixel reaction time by self, and the display device is provided with the image control unit, the photoelectric measuring module and the processing unit, so that the display device can be operated by a user to measure the actual pixel reaction time after leaving a factory by depending on the measuring module and the processor of the display device. Furthermore, an overdrive look-up table (OD LUT) may be generated according to the measured data to speed up the pixel response time, so that the dynamic image is clearer, and the factors of liquid crystal aging and ambient temperature are overcome, so that the display device can have a consistent response time performance.
The present invention is capable of other embodiments, and various changes and modifications can be made by one skilled in the art without departing from the spirit and scope of the invention.
Claims (10)
1. A display device, comprising:
the image control unit is used for outputting a plurality of groups of image signals in sequence, and each group of image signals comprises a first image signal and a second image signal with different gray scales;
the display unit is in communication connection with the image control unit and is used for receiving the multiple groups of image signals and displaying multiple groups of images according to the multiple groups of image signals, and each group of images comprises a first gray-scale image corresponding to the first image signal and a second gray-scale image corresponding to the second image signal;
the photoelectric measurement module is used for continuously measuring the brightness value of the display unit and converting the brightness value into a corresponding voltage signal in the dynamic process that the display unit displays the first gray-scale image and switches to the second gray-scale image; and
and the processing unit is used for continuously reading the voltage signal generated by the photoelectric measurement module until the second gray-scale image is in a stable state, defining a first voltage signal corresponding to the first gray-scale image before switching, defining a second voltage signal corresponding to the second gray-scale image before switching, and calculating the delay time between the first voltage signal and the second voltage signal.
2. The display device according to claim 1, wherein the processing unit comprises a timer for recording the voltage signal read at each time and forming a voltage signal-time relationship table, and the processing unit calculates a time difference between the first voltage signal in the steady state and the second voltage signal in the steady state in the voltage signal-time relationship table as the delay time.
3. The display device according to claim 1, wherein the display unit displays each set of images at different time periods or different temperatures, and the processing unit obtains the delay time corresponding to each set of images as the actual pixel response time corresponding to each set of images to form at least one actual pixel response time table.
4. The display device according to claim 3, wherein the processing unit forms at least one corresponding overdrive lookup table according to the at least one actual pixel response time table and at least one target pixel response time.
5. The display device according to claim 1, wherein the display device comprises a first housing, the display unit is disposed in the first housing, and the first housing is provided with a receiving groove; in the accommodating state, the photoelectric measuring module is accommodated in the accommodating groove, and in the measuring state, the photoelectric measuring module rotates out of the accommodating groove and is positioned in front of the display unit.
6. The display device according to claim 1, further comprising a temperature sensor attached to the display unit for sensing a temperature of the display unit so as to obtain at least one actual pixel response time table at different usage temperatures.
7. The display device according to claim 1, wherein the optoelectronic measurement module further comprises an operational amplifier for adjusting the voltage gain and offset of the optoelectronic measurement module such that the voltage signals obtained by the optoelectronic measurement module are all in a linear working range.
8. A measuring method of a display device is characterized in that the display device comprises an image control unit, a display unit, a photoelectric measuring module and a processing unit; the method for measuring the optical characteristic of the optical fiber comprises the steps of,
step A, the image control unit outputs a plurality of groups of image signals in sequence, wherein each group of image signals comprises a first image signal and a second image signal with different gray scales;
step B, the display unit displays a plurality of groups of images according to the plurality of groups of image signals, wherein each group of images comprises a first gray-scale image corresponding to the first image signal and a second gray-scale image corresponding to the second image signal;
step C, the photoelectric measurement module continuously measures the brightness value of the display unit and converts the brightness value into a corresponding voltage signal in the dynamic process that the display unit displays the first gray-scale image and switches to the second gray-scale image; and
and step D, the processing unit continuously reads the voltage signal generated by the photoelectric measurement module until the second gray-scale image reaches a stable state, defines a first voltage signal corresponding to the first gray-scale image before switching, defines a second voltage signal corresponding to the second gray-scale image before switching, and calculates the delay time between the first voltage signal and the second voltage signal.
9. The method of claim 8, further comprising, during the steps A to D, cyclically executing at different time periods or different temperatures, the processing unit obtaining the delay time corresponding to each set of images as the actual pixel response time corresponding to each set of images to form at least one actual pixel response time table.
10. The method of claim 9, further comprising the processing unit forming at least one corresponding overdrive lookup table according to the at least one actual pixel response time table and at least one target pixel response time.
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