Display device and brightness adjustment method thereof

Abstract

A display device comprises an input device, a processor and an output device, the input device is configured to acquire an initial gray scale of a display screen of a display module; the processor is configured to color the initial gray scale value of the display screen of the display module by using a first LUT; the output device comprises the display module and is configured to output the color-adjusted display screen, the color-adjusted display screen meets the DICOM GSDF standard, and the contrast response value of the color-adjusted display screen is less than or equal to 11%.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and in particular to a display device and a method for adjusting the brightness of the same. Background Technology

[0002] Display devices require gamma calibration before leaving the factory to ensure that the displayed images meet human visual perception. For medical display devices, in addition to gamma calibration, digital imaging and communications in medicine (DICOM) calibration is also required to ensure consistency of medical images displayed on different display devices. Summary of the Invention

[0003] On one hand, a display device is provided, including an input device, a processor, and an output device. The input device is configured to acquire the initial grayscale of the display image of the display module. The processor is configured to adjust the color of the initial grayscale of the display image of the display module using a first LUT. The output device includes the display module and is configured to output the color-adjusted display image, wherein the color-adjusted display image meets the DICOM GSDF standard, and the contrast response value of the color-adjusted display image is less than or equal to 11%.

[0004] In some embodiments, the first LUT includes at least one first LUT value; the first LUT value satisfies the following relationship:

[0005]

[0006]

[0007] Where j = 0, 1, 2, ..., N-1, N = 2 X T(j) is the first LUT value corresponding to the j-th gray level in the first LUT, and L(j) is the value based on L... min and L max The luminance value of the j-th gray level obtained through the DICOM GSDF standard, where K(j) is the intermediate value when calculating T(j), and L... min L is the minimum brightness value for the display module. max Let j be the maximum brightness value of the display module, and j be the grayscale value of the first LUT at the j-th grayscale level. max X is the maximum grayscale value of the first LUT, X is the number of bits that the processor can call, X' is the number of bits of the display module, and α is the correction coefficient.

[0008] In some embodiments, the correction coefficient α ranges from 2.225 to 2.245.

[0009] In some embodiments, the correction coefficient a is in a range of 2.230-2.240.

[0010] In some embodiments, the correction coefficient a is 2.235.

[0011] In some embodiments, the number of bits available to the processor is greater than or equal to the number of bits of the display module.

[0012] In some embodiments, the number of bits available to the processor is 10, and the number of bits of the display module is 8 or 10.

[0013] In some embodiments, the display device further comprises a signal converter. The signal converter is configured to change the number of bits of the display picture after color adjustment, so that the number of bits of the display picture after color adjustment is equal to the number of bits of the display module, when the number of bits of the display picture after color adjustment is inconsistent with the number of bits of the display module.

[0014] In some embodiments, the display device further comprises a gray scale converter. The gray scale converter is configured to change the number of bits of the input display picture, so that the number of bits of the input display picture is equal to the number of bits available to the processor, when the number of bits of the input display picture is inconsistent with the number of bits available to the processor.

[0015] In some embodiments, the processor is further configured to color adjust the initial gray scale of the display picture using a second LUT, and the second LUT is different from the first LUT.

[0016] In some embodiments, the second LUT makes the display picture after color adjustment satisfy a GAMMA curve.

[0017] In some embodiments, the processor is further configured to switch between the first LUT and the second LUT, and color adjust the initial gray scale of the display picture using the first LUT or the second LUT.

[0018] In some embodiments, the processor is configured to color adjust the initial gray scale of a first display area of the display picture of the display module using the first LUT, and color adjust the initial gray scale of a second display area of the display picture of the display module using the second LUT.

[0019] In some embodiments, the first display area and the second display area do not overlap, and the display picture of the display module is completely divided by the first display area and the second display area.

[0020] In some embodiments, the display device further comprises a brightness sensing device. The brightness sensing device is configured to detect a brightness value of the display side of the display module. The processor is further configured to determine a brightness change of the display side of the display module according to the brightness value of the display side of the display module, and adjust the actual display brightness of the display side of the display module if the brightness change of the display side of the display module is greater than a first threshold value.

[0021] In some embodiments, the display device further comprises a brightness acquisition device coupled to the processor. The brightness acquisition device is configured to acquire a brightness value of an environment in which the display side of the display module is located. The processor is further configured to adjust the actual display brightness of the display module according to the brightness value of the environment in which the display side of the display module is located.

[0022] In some embodiments, the processor is configured to adjust a duty cycle of pulse width modulation (PWM) of the light emitting element corresponding to each gray scale of the display module.

[0023] In some embodiments, K(j) is the result of rounding the actual calculated value on the right side of the equation (1-1), and the rounding operation occurs at the first, second or third digit after the decimal point of the actual calculated value on the right side of the equation (1-1).

[0024] On the other hand, a brightness adjustment method of a display device is provided, comprising: obtaining an initial gray scale of a display picture; adjusting the color of the initial gray scale of the display picture using a first display data lookup table (LUT); and outputting the display picture after color adjustment, wherein the display picture after color adjustment meets the DICOM GSDF standard, and the contrast response value of the display picture after color adjustment is less than or equal to 11%.

[0025] In some embodiments, the first LUT comprises at least one first LUT value, and the first LUT value satisfies the following relationship:

[0026]

[0027]

[0028] wherein j = 0, 1, 2, …, N-1, N = 2 X T(j) is the first LUT value corresponding to the jth gray scale in the first LUT, L(j) is the jth gray scale value of the display module according to L min and L max the jth gray scale brightness value obtained by the DICOM GSDF standard, K(j) is the intermediate value when calculating T(j), L min is the minimum brightness value of the display module, L max is the maximum brightness value of the display module, j is the gray scale value of the jth gray scale of the first LUT, j maxX is the maximum gray scale value of the first LUT, X' is the bit number of the display module, and a is a correction coefficient.

[0029] In some embodiments, the method further comprises switching the first LUT and the second LUT. The initial gray scale of the display screen of the display module is adjusted using the first LUT or the second LUT, and the second LUT makes the adjusted screen satisfy the GAMMA 2.2 curve.

[0030] In some embodiments, K(j) is the result of rounding the actual calculated value on the right side of the equation (1-1), and the rounding operation occurs at the first, second or third digit after the decimal point of the actual calculated value on the right side of the equation (1-1).

[0031] In another aspect, a non-transitory computer-readable storage medium is provided. The non-transitory computer-readable storage medium stores computer program instructions, which, when executed on a computer (e.g., a display device), cause the computer to perform the brightness adjustment method of the display device according to any of the above embodiments.

[0032] In yet another aspect, a computer program product is provided. The computer program product includes computer program instructions, which, when executed on a computer (e.g., a display device), cause the computer to perform the brightness adjustment method of the display device according to any of the above embodiments.

[0033] In yet another aspect, a computer program is provided. When the computer program is executed on a computer (e.g., a display device), the computer program causes the computer to perform the brightness adjustment method of the display device according to any of the above embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the present disclosure, the following will briefly introduce the drawings needed to be used in some embodiments of the present disclosure. Obviously, the drawings described in the following description are only the drawings of some embodiments of the present disclosure, and other drawings can also be obtained by those skilled in the art according to these drawings. In addition, the drawings in the following description can be regarded as schematic diagrams, and are not limited to the actual size, actual process, actual timing of signals, etc. of the products involved in the embodiments of the present disclosure.

[0035] Figure 1 is a schematic diagram of a GAMMA curve and a DICOM curve according to some embodiments;

[0036] Figure 2 is a schematic diagram of a display device according to some embodiments;

[0037] Figure 3 FIG. 6 is a schematic diagram of another DICOM curve according to some embodiments;

[0038] Figure 4 FIG. 7 is a schematic diagram of another display device according to some embodiments;

[0039] Figure 5 FIG. 8 is a schematic diagram of a display screen of a display module according to some embodiments;

[0040] Figure 6A FIG. 9 is a schematic diagram of a display module according to some embodiments;

[0041] Figure 6B FIG. 10 is a schematic diagram of another display module according to some embodiments;

[0042] Figure 7 FIG. 11 is a schematic diagram of a brightness sensing device according to some embodiments;

[0043] Figure 8 FIG. 12 is a schematic diagram of a brightness collecting device according to some embodiments;

[0044] Figure 9 FIG. 13 is a flowchart of a brightness adjusting method of a display device according to some embodiments. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present disclosure.

[0046] Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an open, inclusive sense as "including, but not limited to." As used throughout the description and the claims, the term "one embodiment," "some embodiments," "an exemplary embodiment," "example," "specific example," or "some examples" means that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the disclosure, but not necessarily all embodiments or examples. The above-mentioned terms do not necessarily refer to the same embodiment or example. Furthermore, the described features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0047] Hereinafter, the terms "first", "second", etc. are used only for the purpose of description, and should not be construed as indicating or implying relative importance or implying the number of the technical features indicated. Thus, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the disclosure, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0048] In describing some embodiments, "coupled" and "connected", and variations thereof, can be used. For example, the term "connected" can be used to mean that two or more components are in direct physical or electrical contact with each other. As another example, the term "coupled" can be used to mean that two or more components are in direct physical or electrical contact with each other. However, the terms "coupled" or "communicatively coupled" can also mean that two or more components are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content herein.

[0049] "A, B, and C at least one of" has the same meaning as "at least one of A, B, or C", and includes the following combinations of A, B, and C: only A, only B, only C, a combination of A and B, a combination of A and C, a combination of B and C, and a combination of A, B, and C.

[0050] "A and / or B" includes the following three combinations: only A, only B, and a combination of A and B.

[0051] As used herein, the term "if' is, optionally, interpreted as meaning "when" or "while" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [stated condition or event] is detected" is, optionally, interpreted as meaning "upon determining" or "in response to determining" or "upon detecting [stated condition or event]" or "in response to detecting [stated condition or event]," depending on the context.

[0052] The use of "adapted to" or "configured to" herein means open and inclusive language that does not exclude devices that are adapted to or configured to perform additional tasks or steps.

[0053] As used herein, "about," "approximately," or "circa" includes the recited value and the average value within an acceptable range of deviation from the particular value, as determined by one of ordinary skill in the art considering the measurement being discussed and the error in measurement associated with the particular quantity being measured (i.e., the limitations of the measurement system).

[0054] In the medical field, when doctors diagnose through medical images, the accuracy of the diagnosis depends largely on the picture information of the medical images displayed by the display module (for example: medical display screen). When the medical images are displayed on different display modules, because the manufacturers and models of different display modules and other parameters can be different, the pictures of the same medical images displayed on different display modules are inconsistent, thereby affecting the accuracy of the doctors' diagnosis. In order to ensure that the pictures of the same medical images displayed on different display devices are consistent, the display module can be calibrated by using the DICOM standard.

[0055] Part 14 in the DICOM standard defines a Grayscale Standard Display Function (GSDF), and the GSDF function can ensure that the medical images are displayed with consistent grayscale pictures on multiple display devices that meet the DICOM standard. Therefore, for different display modules that meet the DICOM standard, the displayed pictures can remain consistent, thereby improving the accuracy of diagnosis.

[0056] Exemplarily, the picture displayed by the display module meets the DICOM standard, including that each gray scale of the display module meets the DICOM curve between the gray scale and the luminance corresponding to the gray scale. As shown in Figure 1 The curve 12 is the DICOM curve, and when the relationship between each gray scale of the display module and the luminance corresponding to the gray scale meets the curve 12, the picture displayed by the display module meets the DICOM standard.

[0057] In order to make the picture displayed by the display module meet the DICOM standard, generally, the display device needs to be calibrated according to the DICOM curve when it is shipped. In the related art, when the picture displayed by the display device does not meet the DICOM curve, the display data lookup table (LUT) of the display device needs to be corrected. The LUT table may be stored in the system board of the display device, for example. That is, when the display brightness corresponding to a gray scale in the display module does not meet the DICOM curve, the LUT table corresponding to the gray scale needs to be corrected so that the display brightness corresponding to the gray scale meets the DICOM curve. Due to the differences between different display devices, the LUT table of each display device needs to be corrected before it is shipped. However, when the LUT table of each display device is corrected in the related art, the phenomenon of level coincidence (the brightness of two adjacent gray scales is the same) and back level (the brightness of the previous gray scale is greater than the brightness of the next gray scale) inevitably occurs in the picture displayed by the display device, which affects the accuracy of the displayed picture.

[0058] Therefore, an embodiment of the present disclosure provides a display device which can more accurately display the brightness of each gray scale when meeting the DICOM standard.

[0059] Figure 2 A display device 20 provided by an embodiment of the present disclosure, as shown in the figure, includes an input device 21, a processor 22, and an output device 23. Figure 2 The input device 21 is configured to obtain an initial gray scale of a display picture.

[0060] The output device 23 includes a display module 231, for example. The display module 231 may be any one of an organic electroluminescence display (OLED), a quantum dot light emitting diode (QLED), a quantum dot organic electroluminescence display (QD-OLED), a liquid crystal display (LCD), and the like, and the type of the display module 231 is not limited in the present disclosure.

[0061] The input device 21 is configured to obtain an initial gray scale of a display picture.

[0062] Exemplarily, the input device 21 can obtain the initial gray scale of the display picture pixel. The initial gray scale of the display picture can be the gray scale data of the picture input to the display device 20 and used for display in the display module 231. The initial gray scale of the display picture can be determined by the display bit number of the display picture (hereinafter can be referred to as the bit number of the display picture). For example, if the display picture is displayed by 8 bits, the initial gray scale number is 2 8 = 256, and the initial gray scale range is: 0th gray scale-255th gray scale. For another example, if the display picture is displayed by 10 bits, the initial gray scale number is 2 10 = 1024, and the initial gray scale range is: 0th gray scale-1023th gray scale.

[0063] Exemplarily, the initial gray scale of the display picture is the initial gray scale of the display picture input from the outside to the display device 20, and the initial gray scale of the display picture is used to express the display information of the display picture. For example, the display picture can be a lesion site image or an image including a lesion site image.

[0064] In some examples, the display picture can be input to the input device 21 according to the control instruction issued by the computer, for example, the display picture can be input from the computer main control board. The display picture can be input to the input device 21 by wired or wireless mode. When the display picture enters the input device 21 by wireless mode, the input device 21 can also include a wireless transmission component, such as a wifi component or a Bluetooth component.

[0065] In some embodiments, the bit number that the processor 22 can call can be the same as or different from the bit number of the input display picture. It should be noted that the input display picture can be the display picture obtained by the input device 21, that is, the display picture composed of the initial gray scale data of the display picture obtained by the input device 21.

[0066] Exemplarily, the bit number that the processor 22 can call is greater than or equal to the bit number of the input display picture. For example, the bit number that the processor 22 can call is 10, and the bit number of the input display picture is 8, or the bit number that the processor 22 can call is 10, and the bit number of the input display picture is also 10.

[0067] In order to ensure that the bit number of the input display picture is the same as the bit number that the processor 22 can call, in some embodiments, the display device 20 further comprises a gray scale converter configured to change the bit number of the input display picture when the bit number of the input display picture and the bit number that the processor 22 can call are inconsistent, so that the bit number of the input display picture is equal to the bit number that the processor 22 can call.

[0068] In some examples, the gray scale converter can be located in the processor 22. The gray scale converter being located in the processor 22 can be understood as the gray scale converter being a part of the processor 22, or the processor 22 can implement the function of the gray scale converter (for example, the processor 22 and the gray scale converter are the same device). For example, when the bit number of the input display image is 8 and the bit number that can be called by the processor 22 is 10, after the processor 22 obtains the initial gray scale of the input display image from the input device 21, the processor 22 can adjust the bit number of the input display image from 8 to 10, so that the gray scale number of the input display image is consistent with the gray scale number of the processor 22.

[0069] In other examples, the gray scale converter can also be located in the input device 21. The gray scale converter being located in the input device 21 can be understood as the gray scale converter being a part of the input device 21, or the input device 21 can implement the function of the gray scale converter (for example, the input device 21 and the gray scale converter are the same device). For example, when the bit number of the input display image is 8 and the bit number that can be called by the processor 22 is 10, after the input device 21 obtains the initial gray scale of the input display image, the input device 21 can adjust the bit number of the input display image from 8 to 10, so that the gray scale number of the input display image is consistent with the gray scale number of the processor 22.

[0070] As yet other examples, the gray scale converter can also be coupled with the input device 21 and the processor 22 respectively, for receiving the input display image of the input device 21, and converting the bit number of the input display image to the same bit number as the bit number that can be called by the processor 22, and then inputting into the processor 22, so that the gray scale number of the input display image is consistent with the gray scale number of the processor 22.

[0071] After the processor 22 obtains the input display image, the initial gray scale of the input display image needs to be color adjusted. The processor 22 is configured to color adjust the initial gray scale value of the display image by using the first LUT.

[0072] It should be noted that the initial gray scale of the display image for color adjustment can be the initial gray scale of the input display image, or the initial gray scale of the display image after conversion by the gray scale converter. The gray scale converter does not color adjust the gray scale. For example, the gray scale proportion of red, green and blue of each pixel in the input display image is the same as that of the display image after conversion by the gray scale converter.

[0073] It can be understood that the initial gray scale and the color-adjusted gray scale in the embodiments of the present disclosure are divided according to whether color adjustment is performed.

[0074] The processor 22 adjusts the initial gray scale value of the display image by using the first LUT, including that the processor 22 adjusts the gray scale value of each pixel of the display module 231 according to the first LUT.

[0075] In some embodiments, the first LUT includes at least one first LUT value. In some examples, the first LUT includes all first LUT values.

[0076] wherein each first LUT value has a one-to-one corresponding relationship with a gray scale value. The first LUT value satisfies the following relationship:

[0077]

[0078]

[0079] In formulas (1-1 and 1-2), T(j) is a first LUT value corresponding to the jth gray scale in the first LUT. K(j) is an intermediate value when calculating T(j) by using formula (1-2). After the processor 22 adjusts the jth gray scale of the display image according to T(j), the display module 231 can output a display image that meets the DICOM GSDF standard. That is, it can be ensured that each gray scale of the display image after color adjustment meets the DICOM curve, such as meeting the middle curve 12. Figure 1

[0080] In formulas (1-1 and 1-2), X is the number of bits that the processor 22 can adjust, and X' is the number of bits of the display module 231. The value range of j, which is the gray scale corresponding to the first LUT, is determined by the number of bits X that the processor 22 can adjust. When j = 0, 1, 2, …, N-1, the minimum value of j is 0, and the maximum value of j is N-1, where N = 2 X . For example, when the number of bits X that the processor 22 can adjust is 10, the maximum value of j is 2 X -1 = 1023.

[0081] j max is the maximum gray scale value of the first LUT. When the number of bits X that the processor 22 can adjust is 10, the maximum gray scale value j max of the first LUT table is 1023.

[0082] L min is the minimum luminance value of the display module 231, L max is the maximum luminance of the display module 231, L min , and L max ​The minimum luminance value and the maximum luminance of the display module 231 can be measured by a measuring instrument such as a color analyzer. For example, for an 8-bit display module 231, the minimum luminance L min and the maximum luminance L max of the display module 231 can be measured by detecting the 0 gray scale sub-pixel or picture displayed by the display module 231 and the 255 gray scale sub-pixel or picture displayed by the display module 231, respectively. It should be noted that L max should be understood as the luminance of the display module 231 when it actually displays the highest gray scale; it can be understood that the maximum luminance that the display module 231 is capable of displaying can be greater than L max .

[0083] For example, the pixels of the display module 231 include red, green and blue sub-pixels, and the 0 gray scale and 255 gray scale luminances of the red, green and blue sub-pixels are detected to obtain the red L min and L max , the green L min and L max , and the blue L min and L max .

[0084] L(j) is the luminance value of the jth gray scale obtained according to L min and L max obtained by the DICOM GSDF standard. The luminance value L(j) of the jth gray scale that satisfies the DICOM GSDF standard can be referred to as a theoretical luminance value.

[0085] For example, for red, green and blue, the red L(j), the green L(j) and the blue L(j) can be obtained by their L min and L max , i.e., the red L min and L max , the green L min and L max , and the blue L min and L max , respectively. Further, the first LUT values T(j) of red, green and blue are calculated according to the red L(j), the green L(j) and the blue L(j), respectively. It can be understood that the first LUT can include the first LUT values of red, green and blue.

[0086] In the formulas (1-1 and 1-2), a is a correction coefficient, and in some embodiments, the value range of a can be 2.225-2.245; preferably, the value range of a can also be 2.230-2.240; more preferably, a can be 2.235.

[0087] For example, the value range of the correction system a is 2.225-2.245, and the contrast response value of the display image after color correction by the first LUT can be less than or equal to 11%.

[0088] For example, the value range of the correction system a is 2.230-2.240, and the contrast response value of the display image after color correction by the first LUT can be less than or equal to 9%.

[0089] For example, the value range of the correction system a is 2.230-2.240, and the contrast response value of the display image after color correction by the first LUT can be less than or equal to 9%.

[0090] It should be noted that in the case of calculating T(j) by using formula (1-1 and 1-2), K(j) obtained can also be understood as the result of "rounding off" the value actually calculated on the right side of the formula (1-1) equation. The "rounding off" operation can occur at any digit after the decimal point of the value actually calculated on the right side of the formula (1-1) equation, for example, it can occur at the first digit, the second digit or the third digit after the decimal point.

[0091] For example, the "rounding off" operation can occur at the first digit after the decimal point of the value actually calculated on the right side of the formula (1-1) equation, which can be understood as "rounding off" the first digit after the decimal point. For example, when the value actually calculated on the right side of the formula (1-1) equation is 3.25, the value of K(j) can be 3.

[0092] For example, the "rounding off" operation can occur at the second digit after the decimal point of the value actually calculated on the right side of the formula (1-1) equation, which can be understood as "rounding off" the second digit after the decimal point. For example, when the value actually calculated on the right side of the formula (1-1) equation is 3.25, the value of K(j) can be 3.3.

[0093] For example, the "rounding off" operation can occur at the second digit after the decimal point of the value actually calculated on the right side of the formula (1-1) equation, which can be understood as "rounding off" the second digit after the decimal point. For example, when the value actually calculated on the right side of the formula (1-1) equation is 3.25, the value of K(j) can be 3.3.

[0094] As can be seen from formula (1-1 and 1-2), to obtain a first LUT value corresponding to the jth gray scale in the first LUT, L(j) needs to be obtained first. For example, under the DICOM GSDF standard, the theoretical luminance value L(j) of each gray scale can be determined according to the minimum luminance value L min and the maximum luminance value L max .

[0095] The calculation process of the theoretical luminance value L(j) in formula (1-1 and 1-2) is described below. According to the GSDF function standard in the DICOM standard, the calculation process can include formula (2), formula (3) and formula (4) as described below.

[0096] Chapter 14 of the DICOM standard document defines the GSDF function, and the GSDF curve corresponding to the GSDF function takes the Just Noticeable Difference (JND) as the horizontal coordinate and the luminance as the vertical coordinate. Among them, the JND can represent the gray scale that the human eye can distinguish, for example, the JND value can represent a gray scale, and each gray scale (i.e. each JND value) corresponds to a luminance.

[0097] When the minimum luminance L min and the maximum luminance L max of the display module 231 are obtained, the first gray scale (i.e. the first JND value) corresponding to the minimum luminance and the second gray scale (i.e. the second JND value) corresponding to the maximum luminance can be obtained according to formula (2). Among them, the first JND value can determine the first endpoint of the gray scale interval, and the second JND value can determine the second endpoint of the gray scale interval. Therefore, by the minimum luminance L min and the maximum luminance L max , the range of the gray scale interval can be determined.

[0098] Specifically, first, the gray scale JND value corresponding to the minimum luminance L min and the gray scale JND value corresponding to the maximum luminance L max are calculated by formula (2):

[0099]

[0100] Among them, L j , L min and L max , A = 71.498068, B = 94.593053, C = 41.912053, D = 9.8247004, E = 0.28175407, F = -1.1878455, G = -0.18014349, H = 0.14710899, I = -0.017046845.

[0101] For example, when the minimum luminance L min of the display module 231 is 0.5 nit and the maximum luminance L max is 800 nit, according to formula (2), the first JND value corresponding to the minimum luminance L min , and the second JND value corresponding to the maximum luminance L maxa corresponding second JND value. The gray scale interval is obtained according to the first JND value and the second JND value.

[0102] When the number of bits available to the processor is 10 bits, the gray scale interval can be divided into 1024 gray scales, i.e., JND(0) to JND(1023), and in formula (2), j takes the value of j=0 or j=1023; when j=0, the first JND value is JND(0), and when j=1023, the second JND value is JND(1023).

[0103] Specifically, the remaining JND values, i.e., JND(1) to JND(1022), can be obtained according to formula (3) by using JND(0) and JND(1023) obtained from formula (2).

[0104]

[0105] wherein j=0, 1, 2, …, 1023, and N=1024.

[0106] Then, the values of each JND obtained from formula (2) and formula (3) can be used to obtain the theoretical luminance value L(j) corresponding to each gray scale according to the following formula (4).

[0107]

[0108] In formula (4), L(j) is the theoretical luminance value of the jth gray scale, JND(j) is the JND value of the jth gray scale, j=0, 1, 2, …, 1023, a=-1.301877, b=-2.5840191E-2, c=8.0242636E-2, d=-1.0320229E-1, e=1.3646699E-1, f=2.8745620E-2, g=-2.5486404E-2, h=-3.1978977E-3, k=1.2992634E-4, and m=1.3635334E-3.

[0109] For example, the values of JND(0) to JND(1023) obtained from formula (2) and formula (3) are respectively brought into formula (4), and the theoretical luminance values L(0) to L(1023) corresponding to the 0th gray scale to the 1023th gray scale can be calculated.

[0110] For example, when the minimum luminance L min =0.5nit, and the maximum luminance L max=800nit, and when the determined gray level range is divided into 1024 gray levels, the JND value JND(j) and the theoretical brightness value L(j) corresponding to each gray level can be calculated according to formula (2), formula (3) and formula (4) as shown in Table 1, j = 0, 1, ..., 1023.

[0111] Table 1

[0112] Grey scale value j JND(j) value Theoretical luminance value L(j) (nit) 0 46.55782581 0.500476027 1 47.27146297 0.511975657 2 47.98510012 0.523630443 3 48.69873728 0.535441236 4 49.41237443 0.547408888 5 50.12601159 0.559534253 6 50.83964874 0.571818186 7 51.5532859 0.584261546 8 52.26692305 0.596865192 9 52.98056021 0.609629984 10 53.69419736 0.622556786 …… …… …… 1023 776.6086356 800

[0113] For example, when the minimum brightness L min =0.42nit, maximum brightness L max =400nit, and when the determined gray level range is divided into 256 gray levels, the JND value JND(j) and the theoretical brightness value L(j) corresponding to each gray level can be calculated according to formula (2), formula (3) and formula (4) as shown in Table 2, j = 0, 1, ..., 255.

[0114] Table 2

[0115]

[0116]

[0117] like Figure 3 As shown in Table 1, the relationship between each gray level and its corresponding theoretical brightness value can be obtained. Figure 3 Curve 31 in (a) shows that the brightness of each grayscale level in curve 31 meets the DICOM GSDF standard. This is based on the relationship between each grayscale level and its corresponding theoretical brightness value in Table 2. Figure 3 Curve 32 in (b) shows that the brightness of each gray level in curve 32 meets the DICOM GSDF standard.

[0118] Therefore, according to the above formulas (2), (3), and (4), the theoretical luminance value L(j) corresponding to each gray level can be calculated when the DICOM GSDF standard is met. Here, j = 0, 1, 2…1023, and j is determined by the number of bits available to the processor 22. After obtaining the theoretical luminance value L(j) for each gray level, the values ​​of each first LUT in the first LUT can be calculated according to formulas (1-1 and 1-2). For example, by substituting the obtained theoretical luminance value L(j) into the above formulas (1-1 and 1-2), the first LUT values ​​corresponding to each gray level in the first LUT, i.e., T(0) to T(1023), can be calculated.

[0119] In some examples, the processor 22 can obtain the first LUT value T(j) corresponding to each gray scale according to the formula (1-1 and 1-2), and the first LUT value can be recognized by the processor 22, that is, the processor 22 can adjust the initial gray scale value of the input display image according to T(j) in the first LUT to make the adjusted display image meet the DICOM GSDF standard. For example, the processor 22 adjusts the initial gray scale of the input display image by using the first LUT value can include that the processor 22 configures the luminance ratio of red, green and blue of the same gray scale according to the first LUT value for the initial gray scale of the input display image to achieve the purpose of adjustment; in this way, the color temperature of the display image is also configured.

[0120] In some examples, the display device 20 can store the first LUT. The processor 22 can adjust the initial gray scale of the input display image by using the first LUT stored in the display device 20.

[0121] For example, if the first LUT value corresponding to each gray scale in the first LUT calculated according to the formula (1-1 and 1-2) is different from the base number recognizable by the processor 22, the processor 22 can also perform base number conversion on the first LUT value calculated according to the formula (1) to make the converted first LUT value recognizable by the processor 22. The base number of the first LUT value calculated according to the formula (1-1 and 1-2) is not limited in the embodiments of the present disclosure. For example, when the first LUT value calculated according to the formula (1-1 and 1-2) is a decimal data, and the data recognizable by the processor 22 is a hexadecimal data, the first LUT value in the decimal can be converted into the first LUT value in the hexadecimal recognizable by the processor 22 through a base conversion tool to obtain the first LUT in the hexadecimal.

[0122] The output device 23 is configured to output the adjusted display image, the adjusted display image meets the DICOM GSDF standard, and the contrast response value of the adjusted display image is less than or equal to 11%.

[0123] In some examples, the bit number of the first LUT and the bit number of the processor 22 are consistent, for example, both can be 10 bits.

[0124] In some embodiments, the bit number of the display module 231 and the bit number of the first LUT can be inconsistent. When the bit number of the first LUT and the bit number of the display module 231 are inconsistent, the bit number of the adjusted display image needs to be adjusted before being output through the display module 231. For example, if the bit number of the adjusted display image is 10 and the bit number of the display module 231 is 8, the bit number of the adjusted display image needs to be adjusted to 8 bits before being output through the display module 231.

[0125] To this end, in some embodiments, the display device 20 further comprises a signal converter configured to change the bit number of the display picture after color adjustment when the bit number of the display picture after color adjustment is inconsistent with the bit number of the display module 231, so that the bit number of the display picture after color adjustment is equal to the bit number of the display module 231.

[0126] It should be noted that the gray scale of the display picture after color adjustment can be the gray scale of the display picture after color adjustment directly using the first LUT, or the gray scale of the display picture after color adjustment after conversion by the signal converter.

[0127] For example, the signal converter can convert 1024 gray scales to 255 gray scales for display. For example, the signal converter can perform gray scale conversion by integrating gray scales, such as by merging 4 gray scales into one gray scale, i.e., converting 1024 gray scales to 256 gray scales. Specifically, the signal converter does not change the ratio of red, green, and blue corresponding to each pixel when converting the gray scale of the display picture after color adjustment, so the signal converter does not have a color adjustment function and does not change the color temperature of the display picture after color adjustment. For example, the signal converter does not change the ratio of the gain corresponding to red, green, and blue in each pixel when converting the gray scale of the display picture after color adjustment.

[0128] In some examples, the signal converter can be located in the processor 22. The signal converter located in the processor 22 can be understood as the signal converter can be part of the processor 22, or the processor 22 can implement the function of the signal converter (for example, the processor 22 and the signal converter are the same device). For example, when the bit number of the display picture after color adjustment is 10 and the bit number of the display module 231 is 8, the processor 22 adjusts the bit number of the display picture after color adjustment, and adjusts the bit number of the display picture after color adjustment from 10 to 8, at this time, it can be ensured that the number of gray scales of the display picture after color adjustment is consistent with the number of gray scales of the display module 231.

[0129] In some examples, the signal converter can be located in the processor 22. It can be understood that the signal converter is a part of the processor 22, or the processor 22 can implement the function of the signal converter (for example, the processor 22 and the signal converter are the same device). For example, the processor 22 includes a display module 231 and a driving IC for providing a driving signal to the display module 231, and the signal converter can be located in the driving IC. For example, when the bit number of the display picture after color matching is 10 and the bit number of the display module 231 is 8, the processor 22 adjusts the bit number of the display picture after color matching from 10 to 8 after obtaining the display picture after color matching, so that the gray scale number of the display picture after color matching is consistent with the gray scale number of the display module 231.

[0130] In some examples, the signal converter can be located in the processor 22. It can be understood that the signal converter is a part of the processor 22, or the processor 22 can implement the function of the signal converter (for example, the processor 22 and the signal converter are the same device). For example, the processor 22 includes a display module 231 and a driving IC for providing a driving signal to the display module 231, and the signal converter can be located in the driving IC. For example, when the bit number of the display picture after color matching is 10 and the bit number of the display module 231 is 8, the processor 22 adjusts the bit number of the display picture after color matching from 10 to 8 after obtaining the display picture after color matching, so that the gray scale number of the display picture after color matching is consistent with the gray scale number of the display module 231.

[0131] Figure 4 Another display device 40 provided by the embodiments of the present disclosure is shown in FIG. 4. The display device 40 includes a system board 41 and a display panel (PANEL) 43. Figure 4

[0132] As shown in FIG. 4, the display device 40 includes a system board 41 and a display panel (PANEL) 43. Figure 4 ​As shown, the system board 41 in the display device 40 includes a microcontroller unit (MCU) 411, which can be used to color the initial gray scale of the input display picture, the MCU 411 is coupled with a memory 414, the first LUT is stored in the memory 414, the MCU 411 calls the first LUT from the memory 414, and uses the first LUT to color the initial gray scale of the input display picture. The system board 41 can also include a panel interface (PANEL INTERFACE) 413, a display processing engine (DPE) 416, a multiplexer (MUX) 417, an analog front end (AFE) 418, and a receiver (the receiver can include at least one of a receiver 419 and a receiver 419'), etc. Among them, the input device 21 can include the receiver 419 and / or the receiver 419', and the input device 21 can also include the AFE 418. The processor 22 can include the MCU 411, the DPE 416, and the MUX 417. The output device can include the panel interface (PANEL INTERFACE) 413 and the display panel 43. The gray scale converter and the signal converter can also be implemented by the MCU 411.

[0133] Specifically, the display panel 43 is located in the display module 231, and the display panel 43 displays the display picture after coloration; the display module 231 can be any one of an organic electroluminescence display (OLED), a quantum dot light emitting diode (QLED), a quantum dot organic electroluminescence display (QD-OLED), a liquid crystal display (LCD), and the like, and the type of the display panel 43 is not limited in the embodiments of the present disclosure. The display module 231 can also include an assembly component, for example, a housing. When the display panel 43 is a liquid crystal panel, the display module 231 can also include a backlight source, and the display picture can be light emitted by the backlight source and transmitted through the liquid crystal panel, and modulated by the liquid crystal panel.

[0134] As Figure 4As shown, when the signal source 42 sends a display signal of a display picture to the system board 41, at least one of the receiver 419 and the receiver 419' receives the signal sent by the signal source 42. For example, when the display signal sent by the signal source 42 is an analog signal, the receiver 419 receives the display signal and sends the display signal to the AFE 418, and the AFE 418 processes the display signal, for example, performs analog-to-digital conversion on the analog display signal to generate a digital display signal. If the display signal is a digital signal, the receiver 419' receives the display signal. The receiver 419' and the AFE 418 send the display signal to the MUX 417, and the display signal is processed by the MUX 417 and the DPE 416, and then the DPE 416 sends the processing result to the MCU 411. The MCU 411 performs display processing according to the display requirement, for example, the display requirement can be color adjustment processing on the display picture, at this time, the MCU 411 calls the first LUT stored in the memory 414 to perform color adjustment on the initial gray scale of the display picture. The MCU 411 controls the display panel 43 to output the color-adjusted display picture through the panel interface 413.

[0135] In summary, in the embodiment of the present disclosure, the processor 22 performs color adjustment on the display picture of the display module 231 according to the first LUT, so that the display picture of the display module 231 can meet the DICOM GSDF standard. In the embodiment of the present disclosure, the first LUT can be used to more accurately perform color adjustment on the input display picture, and the abnormal phenomena such as step-up and step-down of the display picture caused by errors in the adjustment process are avoided, and the problem of excessive unevenness of picture brightness is solved.

[0136] Figure 5 The present disclosure provides two display pictures of the display module 231. As shown in Figure 5 Figure 5 (a) in FIG. 1 is a display picture of the display module 231 after color adjustment using the LUT in the related art, Figure 5 (b) in FIG. 1 is a display picture of the display module 231 after color adjustment using the first LUT in the embodiment of the present disclosure. As shown in Figure 5 Figure 5 The brightness of the display picture of the display module 231 shown in (a) in FIG. 1 is not very uniform, and the step-up is obvious, while the brightness of the display picture shown in (b) in FIG. 1 is relatively uniform, Figure 5 Figure 5 The display effect of the picture in (b) in FIG. 1 is better than that of the picture in (a) in FIG. 1. Figure 5

[0137] In some embodiments, the processor 22 is further configured to perform color adjustment on the initial gray scale of the input display picture using a second LUT, wherein the second LUT is different from the first LUT.​​​​

[0138] It should be noted that different second LUTs can correspond to different tone curves, and this application does not limit the second LUT. For example, the second LUT can correspond to a GAMMA curve, and the second LUT can make the color-corrected image conform to the GAMMA curve. Figure 1 As shown, curve 11 is the GAMMA curve. When the relationship between each gray level of the display module 231 and the brightness corresponding to that gray level satisfies curve 11, the image displayed by the display module 231 satisfies the GAMMA standard.

[0139] Processor 22 selects different LUTs to adjust the initial grayscale of the input display screen according to display requirements. If processor 22 uses the second LUT to adjust the initial grayscale of the input display screen, the color-adjusted display screen output by display module 231 will satisfy the GAMMA curve.

[0140] For example, refer to Figure 4 The memory 414 can also store a second LUT. That is, the memory 414 can store either the first LUT, the second LUT, or other LUTs corresponding to color curves. According to the display requirements, the MCU 411 calls the first LUT or the second LUT in the memory 414 to adjust the color of the input display screen, and uses the first LUT or the second LUT to adjust the initial grayscale of the display screen. The color-adjusted display screen is then output to the display panel 43 through the panel interface 413.

[0141] In some embodiments, the first LUT can be either an independent LUT or a first LUT obtained from the second LUT according to the mapping relationship, or the second LUT can be either an independent LUT or a second LUT obtained from the first LUT according to the mapping relationship.

[0142] For example, when the display device 20 stores a first LUT and a first mapping relationship between the first LUT and the second LUT, when the first LUT is needed to adjust the initial grayscale of the input display screen, the processor 22 directly calls the first LUT to adjust the initial grayscale of the input display screen; when the second LUT is needed to adjust the initial grayscale of the input display screen, the processor 22 simultaneously calls the first LUT and the first mapping relationship, calculates the second LUT, and then uses the second LUT to adjust the initial grayscale of the input display screen.

[0143] For another example, when the second LUT and the second mapping relationship between the second LUT and the first LUT are stored in the display device 20, when the initial gray scale of the input display picture needs to be color adjusted by using the second LUT, the processor 22 directly calls the second LUT to color adjust the initial gray scale of the input display picture; when the initial gray scale of the input display picture needs to be color adjusted by using the first LUT, the second LUT and the second mapping relationship are called at the same time, the first LUT is calculated, and then the initial gray scale of the input display picture is color adjusted by using the first LUT.

[0144] Generally, the display device 20 will be subjected to GAMMA correction before leaving the factory, so that the luminance of each gray scale output by the display module 231 meets the GAMMA curve. When the luminance of each gray scale of the display module 231 meets the GAMMA curve, the picture displayed by the display module 231 meets the habit of the human eye when watching in daily office work.

[0145] For a medical display module, doctors not only need daily office work, but also need to review medical images. Under these two working modes, the tone curve that the picture displayed by the display module 231 needs to meet is different. For example, in the daily office mode, the display picture of the display module 231 needs to meet the GAMMA curve, so that the display picture of the display module 231 is more suitable for the perception of the human eye. In the reading mode, the display picture of the display module 231 needs to meet the DICOM GSDF standard, so as to restore the medical image and distinguish the lesion area.

[0146] Therefore, the display device 20 provided by the embodiments of the present disclosure can call the first LUT or the second LUT corresponding to different standards according to different working modes, realize the switching of the working mode of the display module 231, and solve the compatibility problem of the daily office work and the reading diagnosis of doctors.

[0147] In some embodiments, the processor 22 is configured to switch the first LUT and the second LUT, and color adjust the initial gray scale of the input display picture by using the first LUT or the second LUT.

[0148] It should be noted that the switching of the first LUT and the second LUT can be understood as follows: when the working mode needs to be changed, the processor 22 changes from using the first LUT to using the second LUT, and color adjusts the initial gray scale of the input display picture by using the second LUT, or changes from using the second LUT to using the first LUT, and color adjusts the initial gray scale of the input display picture by using the first LUT; for example, the first LUT and the second LUT are both stored in the display device 20, and the processor 22 can call any one of the first LUT and the second LUT to color adjust the initial gray scale of the input display picture.

[0149] Exemplarily, the processor 22 can switch the first LUT and the second LUT according to the received switching instruction. For example, when the processor 22 receives the first switching instruction, the second LUT can be switched to the first LUT, and the initial gray scale of the input display picture is color adjusted by the first LUT, so that the color-adjusted picture meets the DICOM GSDF standard, i.e., meets the picture requirement of the reading mode. When the processor 22 receives the second switching instruction, the first LUT can be switched to the second LUT, and the initial gray scale of the input display picture is color adjusted by the second LUT, so that the color-adjusted picture meets the GAMMA curve, i.e., meets the picture requirement of the daily office mode.

[0150] In some examples, the first switching instruction or the second switching instruction can be sent to the processor 22 through state switching. For example, a switching switch can be provided on the display device 20, and the sending of the first switching instruction or the second switching instruction can be realized by the opening and closing of the state switching switch. The implementation mode of the first switching instruction and the second switching instruction is not limited in the embodiment of the disclosure. For example, the switching switch can be a physical key switch or a virtual key switch. The embodiment of the disclosure exemplarily illustrates the implementation of the first switching instruction and the second switching instruction by the switching switch.

[0151] When switching from the daily office mode to the reading mode, the switching switch is opened, the first switching instruction is sent to the processor 22, the processor receives the first switching instruction, and the second LUT is switched to the first LUT in response to the first switching instruction. When switching from the reading mode to the daily office mode, the switching switch is closed, the second switching instruction is sent to the processor 22, the processor 22 receives the second switching instruction, and the first LUT is switched to the second LUT in response to the second switching instruction.

[0152] Taking that the display module 231 currently works in the daily office mode as an example. The processor 22 identifies the switching instruction sent by the switching switch and judges whether the switching switch is in the open or closed state. If the switching switch is in the closed state, the processor 22 continues to control the output device 23 to output the display picture color-adjusted by the second LUT. If the switching switch is switched to the open state, the processor 22 switches the originally called second LUT to the first LUT, re-color adjusts the initial gray scale of the input display picture by the first LUT, and outputs the color-adjusted display picture through the output device 23.

[0153] In some embodiments, the switching of the display screen can be in one-key switching mode according to different working modes, for example, the whole display screen of the display module 231 is switched from the daily office mode to the reading mode. For example, when the display screen displayed on the whole display area of the display module 231 satisfies the GAMMA curve, the display module 231 is in the daily office mode, and if the switching switch is turned on, the display screen displayed on the whole display area of the display module 231 is switched from satisfying the GAMMA curve to satisfying the DICOM GSDF curve, at this time, the display module 231 is switched from the daily office mode to the reading mode.

[0154] In some other embodiments, different display areas on the display module 231 can also be set to different working modes, that is, the display screen displayed on different display areas of the display module 231 satisfies different tone curves. For example, when the display screen displayed on the left display area (first display area) of the display module 231 satisfies the GAMMA standard, the left display area of the display module 231 is in the daily office mode, and the display screen displayed on the right display area (second display area) of the display module 231 satisfies the DICOM GSDF standard, the right display area of the display module 231 is in the reading mode. For example, one or more switching switches can also be provided on the display device 20, and if the corresponding switching switch is turned on, the preset display area of the display module 231 can be switched from the daily office mode to the reading mode.

[0155] In some embodiments, as shown in Figure 6A and Figure 6B The display screen of the display module 231 can be divided into a first display area 2311 and a second display area 2312, and the processor 22 is configured to use the first LUT to adjust the initial gray scale of the display screen of the first display area 2311 of the display module 231, and use the second LUT to adjust the initial gray scale of the display screen of the second display area 2312 of the display module 231.

[0156] For example, the processor 22 can judge the pixel point of the input display screen, if the pixel point is on the first display area 2311, the initial gray scale of the pixel point is adjusted by using the first LUT; if the pixel point of the input screen is on the second display area 2312, the initial gray scale of the pixel point is adjusted by using the second LUT; the first display area 2311 outputs the display screen adjusted by using the first LUT; the second display area 2312 outputs the display screen adjusted by using the second LUT.

[0157] Exemplarily, the first display area 2311 and the second display area 2312 do not overlap, and the display screen of the display module 231 can be completely divided by the first display area 2311 and the second display area 2312. Complete division can be understood as that the first display area 2311 and the second display area 2312 jointly occupy all display areas of the display module 231.

[0158] For example, the display screen of the display module 231 can be divided left and right by the first display area 2311 and the second display area 2312, or can be divided up and down, or other division manners. The first display area 2311 and the second display area 2312 can be set by factory pre-setting or user self-setting, or other manners, which are not limited in the embodiments of the present disclosure.

[0159] Figure 6A A division manner of display areas of a display module 231 is provided in the embodiments of the present disclosure. As shown in Figure 6A , the first display area 2311 and the second display area 2312 divide the display module 231 left and right, wherein the left side of the display screen of the display module 231 is the first display area 2311, and the right side of the display screen is the second display area 2312. The first display area 2311 and the second display area 2312 completely divide the display module 231. In some examples, the areas of the first display area 2311 and the second display area 2312 are equal.

[0160] Figure 6B Another division manner of display areas of a display module 231 is provided in the embodiments of the present disclosure. As shown in Figure 6B , the first display area 2311 can be a larger-area display area in the display module 231, and the second display area 2312 can be a smaller-area display area in the display module 231. The first display area 2311 and the second display area 2312 completely divide the display module 231. In some examples, the area of the first display area 2311 is larger than the area of the second display area 2312. The first display area 2311 can completely surround the second display area 2312.

[0161] For another example, the first display area 2311 can also be a smaller-area display area in the display module 231, and the second display area 2312 can be a larger-area display area in the display module 231. The first display area 2311 and the second display area 2312 completely divide the display module 231. In some examples, the area of the first display area 2311 is smaller than the area of the second display area 2312. The second display area 2312 completely surrounds the first display area 2311.

[0162] As shown in Figure 6A andFigure 6B As shown, the display screen of the first display area 2311 is color adjusted by the first LUT so that the color-adjusted display screen meets the DICOM standard and meets the display requirement of the doctor reading the film. The second display area 2312 is color adjusted by the second LUT so that the color-adjusted display screen meets the GAMMA curve (for example, meets the GAMMA 2.2 curve) and meets the display requirement of the doctor's daily office work. In this way, the doctor can analyze and record while observing the lesion, thereby increasing the doctor's office efficiency.

[0163] For example, the display module 231 is a wide-screen display module, for example, the length-width ratio of the display area of the display module 231 is greater than or equal to 2:1, or the length-width ratio of the display area of the display module 231 is 21:9, so that the first display area 2311 and the second display area 2312 can have a larger display area.

[0164] It should be noted that in the embodiment of the present disclosure, the initial gray scale of the input display screen is color adjusted by the first LUT to meet the DICOM GSDF curve, and the initial gray scale of the input display screen is color adjusted by the second LUT to meet the GAMMA curve, but the color adjustment of the display screen of the first display area 2311 and the second display area 2312 in the embodiment of the present disclosure is not limited to the above two tone curves, but can also be other tone curves, and the present disclosure is not limited to this. For example, the first LUT used in the embodiment of the present disclosure can also be replaced by a third LUT, which is different from the first LUT and the second LUT, so as to realize the switching of the display mode corresponding to the third LUT and the display mode corresponding to the second LUT (the display screen meets the GAMMA curve after color adjustment).

[0165] In some embodiments, as Figure 2 As shown, the display device 20 further comprises a brightness sensing device 24 coupled with the processor 22, and the brightness sensing device 24 is configured to detect the brightness value of the display side of the display module 231. The processor 22 is further configured to determine the brightness change of the display side of the display module 231 according to the brightness value of the display side of the display module 231, and adjust the actual display brightness of the display module 231 if the actual display brightness of the display module 231 is not within the first threshold range.

[0166] For example, the brightness of the display screen of the liquid crystal display module will gradually decrease with the increase of the use time, resulting in deviation of the actual display brightness of the display screen, so that the display screen of the display module 231 cannot meet the DICOM GSDF standard.

[0167] To this end, the display device 20 provided by the embodiment of the present disclosure detects the brightness value of the display side of the display module 231 through the brightness sensing device 24, and adjusts the actual display brightness of the display module 231 in time when it is detected that the actual display brightness of the display module 231 is not within the first threshold range, so as to ensure the consistency of the display brightness.

[0168] The actual display brightness of the display module 231 not being within the first threshold range can be understood as the actual brightness of a specific gray scale presented by the display module 231 not being within the first threshold range. The specific gray scale can be the maximum gray scale. For example, when the display module 231 is 8-bit, the actual display brightness of the display module 231 can be the actual brightness of the 255th gray scale thereof; when the display module 231 is 10-bit, the actual display brightness of the display module 231 can be the actual brightness of the 1023th gray scale thereof.

[0169] The actual display brightness of the display module 231 being within the first threshold range can be understood as the actual brightness of a specific gray scale presented by the display module 231 being within the first threshold range. The specific gray scale can be the maximum gray scale.

[0170] The first threshold range can ensure that when the brightness of the display side of the display module 231 fluctuates, the picture displayed by the display module 231 still meets a specific display standard. For example, when the brightness of the display side of the display module 231 changes within the first threshold range, the picture displayed by the display module 231 meets the DICOM GSDF standard. The size of the first threshold range is not limited by the embodiment of the present disclosure, and the range depends on the standard it complies with.

[0171] For example, the processor 22 does not need to adjust the brightness of each gray scale actually displayed by the display module 231. When the actual brightness of a specific gray scale presented by the display module 231 is within the first threshold range, the actual display brightness corresponding to other gray scales is also adjusted, so that the actual picture displayed by the display module 231 meets the corresponding standard (for example, the DICOM GSDF standard).

[0172] In some examples, the brightness sensing device 24 is configured to detect the actual brightness of the maximum gray scale of the display side of the display module 231, and the processor 22 adjusts the actual brightness of each gray scale of the display side of the display module 231 when the actual brightness of the maximum gray scale is not within the first threshold range.

[0173] For example, the display module 231 is a liquid crystal display module, which includes a liquid crystal display panel and a backlight located on the light-incident side of the liquid crystal display panel. The display device 20 adjusts the actual display brightness of the display module 231 by adjusting the duty cycle of the pulse width modulation (PWM) of the backlight light-emitting element. For example, the backlight includes an LED light source. For instance, when the display device 20 determines that the actual display brightness of the display module 231 is not within a first threshold range and the actual brightness value is less than any value within the first threshold range, it increases the PWM duty cycle of the light-emitting element corresponding to each gray level on the display side of the display module 231, thereby increasing the actual display brightness of the display module 231 and ensuring that the actual display brightness of the display module 231 meets the relevant display standard requirements.

[0174] For example, since the brightness of the transmissive liquid crystal display module is contributed by the backlight, the brightness sensing device 24 can detect the luminous brightness of the backlight to determine whether the luminous brightness is within the second threshold range. When the luminous brightness is not within the second threshold range, the display device 20 can adjust the brightness of the backlight so that the luminous brightness of the backlight is within the second threshold range. It should be noted that the detection of the luminous brightness of the backlight can be by directly detecting the light emitted by the backlight, or by detecting the light emitted by a specific location or element in the backlight. This embodiment does not limit the detection position of the brightness sensing device 24. It is understood that the second threshold range can be different depending on the detection position of the backlight by the brightness sensing device 24, as long as the set second threshold range corresponds to the standard required by the actual display of the display module 231.

[0175] In some examples, display module 231 is a liquid crystal display module. For example... Figure 7 As shown, the display module 231 may include a backplate 71, a backlight 72, and a liquid crystal display panel 73 stacked together. The backlight backplate 71 includes a groove or a through hole, and the brightness sensing device 24 may be located in the groove or through hole to sense the intensity of the light emitted by the backlight 72.

[0176] For example, a recess is located on the side of the back panel 71 facing the backlight 72 to accommodate the brightness sensing device 24. Preferably, the brightness sensing device 24 does not protrude from the side of the back panel 71 facing the backlight 72. For example, the brightness sensing device 24 is located within a through hole on the backlight back panel 71. Preferably, the brightness sensing device 24 does not protrude from the side of the back panel 71 facing the backlight 72.

[0177] For example, a recess or through-hole is located in the central area of ​​the backlight backplate 71 to ensure the accuracy of the data on the brightness change of the display panel 43 detected by the brightness sensing device 24.

[0178] For example, the luminance sensing device 24 is arranged close to the backlight 72 to ensure the accuracy of the data detected by the luminance sensing device 24 on the luminance change of the display panel 43. Preferably, the luminance sensing device 24 is arranged close to the backlight 72.

[0179] For example, the backlight 72 is a side-in backlight or a direct backlight.

[0180] The luminance sensing device 24 can also be arranged in other ways, and the present disclosure does not limit the arrangement of the luminance sensing device 24.

[0181] As shown in Figure 4 The luminance sensing device 24 is coupled to the system board 41. For example, the luminance sensing device 24 can be connected to the external device interface 48 through an I2C interface to realize communication with the system board 41. The external device interface 48 can include a general-purpose input / output (GPIO), a peripheral interface (Peripherals), a universal serial bus (USB) interface, etc. The MCU 411 reads the data obtained by the luminance sensing device 24, and if it is detected that the actual luminance of the display panel 43 is not within the first threshold range, the MCU 411 adjusts the PWM duty cycle of the self-luminous element of the display module 231 to ensure that the actual display of the display module 231 meets the corresponding standard. As an implementation manner, when the display module 231 is a liquid crystal display module, the system board 41 can further include a backlight control interface, and the MCU 411 adjusts the PWM duty cycle of the light-emitting element on the backlight through the backlight control interface.

[0182] In some embodiments, as shown in Figure 2 The display device 20 further includes a luminance acquisition device 25 coupled to the processor 22. The luminance acquisition device 25 is configured to acquire the luminance value of the environment on the display side of the display module 231. The processor 22 is further configured to adjust the actual display luminance value of the display module 231 according to the luminance value of the environment on the display side of the display module 231.

[0183] The luminance of the environment on the display side of the display module 231 can be understood as the intensity of the ambient light received by the display side of the display module.

[0184] The display module 231, such as an LCD, will have different display differences in different degrees due to the change of the environment in addition to the decrease of display brightness with the increase of use time. For a medical display module, the influence of ambient light on display needs to be minimized, and therefore, the environmental information of the display side of the display module 231 needs to be collected, and the brightness of the display side of the display module 231 needs to be adjusted according to different environmental information, so as to ensure that the brightness received by the human eye is basically unchanged.

[0185] For example, the processor 22 adjusts the actual display brightness of the display module 231 according to the environmental brightness collected by the brightness collection device 25, so as to ensure that the total brightness of the light projected from the light-emitting side of the display module 231 is basically unchanged. The total brightness of the light projected from the display side of the display module 231 can be understood as the sum of the brightness of the light emitted from the display side of the display module 231 and the light reflected or scattered after the ambient light acts on the display module 231.

[0186] Specifically, the change range of the total brightness of the light projected from the light-emitting side of the display module 231 is less than or equal to 5%, and it can be considered that the total brightness of the light projected from the light-emitting side of the display module 231 is basically unchanged. Within this range, the brightness received by the human eye is basically unchanged. Preferably, the change range of the total brightness of the light projected from the light-emitting side of the display module 231 can be configured to be less than or equal to 2%. For example, when the display module 231 displays according to the DICOM GSDF standard, the change range of the total brightness of the light projected from the light-emitting side of the display module 231 can be configured to be less than or equal to 2%.

[0187] Specifically, the total brightness of the light projected from the light-emitting side of the display module 231 can be understood as the sum of the actual brightness of a specific gray scale presented on the display side of the display module 231 and the light reflected or scattered after the ambient light acts on the display module 231. The specific gray scale may, for example, be the maximum gray scale (0 gray scale for an 8-bit display) or the minimum gray scale (255 gray scale for an 8-bit display).

[0188] Specifically, when the brightness of the ambient light increases, the processor 22 is configured to decrease the actual display brightness of the display module 231; when the brightness of the ambient light decreases, the processor 22 is configured to increase the actual display brightness of the display module 231. The processor 22 adjusts the actual display brightness of the display module 231 according to the brightness of the ambient light collected by the brightness collection device 25, which can ensure that when the deviation between the brightness of the environment where the display side of the display module 231 is located and the actual display brightness of the display side of the display module 231 fluctuates, the picture displayed by the display module 231 still meets a specific display standard, such as the DICOM GSDF standard.

[0189] For example, the brightness of the actual display of the display module 231 can be adjusted by adjusting the brightness of each gray scale of the display screen of the display module 231, and the proportion of the brightness of the red sub-pixel, the green sub-pixel and the blue sub-pixel of each pixel remains unchanged, that is, the proportion of the gain of the corresponding red, green and blue colors of each pixel remains unchanged.

[0190] For example, when the display module 231 is a liquid crystal display module, the brightness of the actual display of the display module 231 can be adjusted by adjusting the brightness of the light-emitting element of the backlight source of the display module 231.

[0191] For example, as shown in Figure 8 The brightness acquisition device 25 can include a light sensing element 81, which can be arranged above the display module 231. The position of the light sensing element 81 can be set according to requirements. When it is necessary to acquire the ambient light brightness, the light sensing element 81 starts to measure the ambient light brightness facing the display module 231. The type of the light sensing element 81 is not limited in the embodiments of the present disclosure. The light sensing element 81 can be, for example, a brightness sensor or a camera.

[0192] For example, the display module 231 is a liquid crystal display module, and the display module 231 includes a liquid crystal display panel and a backlight source located on the light-in side of the liquid crystal display panel. The display device 20 adjusts the duty cycle of the pulse width modulation (PWM) of the light-emitting element of the backlight source to realize the adjustment of the actual display brightness of the display module 231.

[0193] For example, when the brightness acquisition device 25 acquires that the ambient light brightness increases by 10 nit, the PWM duty cycle of the light-emitting element of the backlight source can be reduced by 1% to ensure that the brightness received by the human eye remains basically unchanged.

[0194] For example, the brightness acquisition device 25 can be arranged to acquire the ambient brightness of the display side of the display module 231 at regular intervals, such as once every week, so as to calibrate the brightness of the display module 231 at regular intervals.

[0195] The embodiments of the present disclosure provide a brightness adjustment method of a display device, as shown in Figure 9 The display device is any one of the display devices in the above embodiments, and the brightness adjustment method includes steps 91 to 93.

[0196] Step 91: acquiring an initial gray scale of a display screen.

[0197] Step 92: adjusting the color of the initial gray scale of the display screen by using a first LUT.

[0198] Step 93: Output the color-corrected display screen. The color-corrected display screen meets the DICOM GSDF standard, and the contrast response value of the color-corrected display screen is less than or equal to 11%.

[0199] In some embodiments, the first LUT includes at least one first LUT value, which satisfies the following relationship:

[0200]

[0201]

[0202] Where j = 0, 1, 2, ..., N-1, N = 2 X T(j) is the first LUT value corresponding to the j-th gray level in the first LUT, and L(j) is the value based on L... min and L max The luminance value of the j-th gray level obtained through the DICOM GSDF standard, where K(j) is the intermediate value when calculating T(j), and L... min To display the minimum brightness value of module 231, L max To display the maximum brightness value of module 231, j is the grayscale value of the first LUT at the j-th grayscale level. max X is the maximum grayscale value of the first LUT, X is the number of bits that the processor 22 can call, X' is the number of bits of the display module 231, and α is the correction coefficient.

[0203] In some embodiments, the correction coefficient α ranges from 2.225 to 2.245.

[0204] In some embodiments, the correction coefficient α ranges from 2.230 to 2.240.

[0205] In some embodiments, the value of the correction factor α is 2.235.

[0206] In some embodiments, the number of bits that the processor can access is greater than or equal to the number of bits in the display module.

[0207] In some embodiments, the processor can call 10 bits, and the display module has 8 or 10 bits.

[0208] In some embodiments, the brightness adjustment method further includes: when the number of bits of the color-adjusted display screen is inconsistent with the number of bits of the display module 231, changing the number of bits of the color-adjusted display screen so that the number of bits of the color-adjusted display screen is equal to the number of bits of the display module 231.

[0209] In some embodiments, the brightness adjustment method further comprises: when the bit number of the input display image is inconsistent with the bit number that the processor 22 can adjust, changing the bit number of the input display image so that the bit number of the input display image is equal to the bit number that the processor 22 can adjust.

[0210] In some embodiments, the brightness adjustment method further comprises: using a second LUT to color the initial gray scale value of the display image, the second LUT being different from the first LUT.

[0211] In some embodiments, the second LUT makes the color-adjusted display image meet the GAMMA curve.

[0212] In some embodiments, the brightness adjustment method further comprises: switching the first LUT and the second LUT, and using the first LUT or the second LUT to color the initial gray scale of the display image.

[0213] In some embodiments, using the first LUT or the second LUT to color the initial gray scale of the display image comprises: using the first LUT to color the initial gray scale of the display image of the first display area of the display module 231, and using the second LUT to color the initial gray scale of the display image of the second display area of the display module 231.

[0214] In some embodiments, using the first LUT to color the initial gray scale of the display image of the first display area of the display module 231 comprises: judging the pixel point of the input display image, and if the pixel point is on the first display area 2311, using the first LUT to color the initial gray scale of the pixel point; and using the second LUT to color the initial gray scale of the display image of the second display area of the display module 231 comprises: judging the pixel point of the input display image, and if the pixel point of the input image is on the second display area 2312, using the second LUT to color the initial gray scale of the pixel point.

[0215] In some embodiments, the first display area and the second display area do not overlap, and the display image of the display module 231 is completely divided by the first display area and the second display area.

[0216] In some embodiments, the brightness adjustment method further comprises: detecting the brightness value of the display side of the display module 231; determining the brightness change of the display side of the display module 231 according to the brightness value of the display side of the display module, and adjusting the brightness of each gray scale of the display module 231 if the brightness change of the display side of the display module 231 is greater than a first threshold value.

[0217] In some embodiments, K(j) is the result of rounding the actual calculated value on the right side of the equation (1-1) to the first, second, or third decimal place.

[0218] In some embodiments, the brightness adjustment method further includes: collecting a brightness value of an environment in which the display module 231 is located; and adjusting the actual displayed brightness of the display module 231 according to the brightness value of the environment in which the display module 231 is located.

[0219] Some embodiments of the present disclosure provide a computer-readable storage medium (for example, a non-transitory computer-readable storage medium) having stored computer program instructions, which, when executed on a computer (for example, a display device), cause the computer to perform the brightness adjustment method of the display device according to any one of the above-described embodiments.

[0220] Exemplarily, the computer-readable storage medium described above can include, but is not limited to, a magnetic storage device (for example, a hard disk, a floppy disk, or a magnetic tape, etc.), an optical disc (for example, a CD (Compact Disk), a DVD (Digital Versatile Disk), etc.), a smart card, and a flash memory device (for example, an EPROM (Erasable Programmable Read-Only Memory), a card, a stick, or a key drive, etc.). The various computer-readable storage media described in the present disclosure can represent one or more devices and / or other machine-readable storage media for storing information. The term "machine-readable storage medium" can include, but is not limited to, a wireless channel and various other media capable of storing, containing, and / or carrying instructions and / or data.

[0221] Some embodiments of the present disclosure also provide a computer program product, for example, stored on a non-transitory computer-readable storage medium. The computer program product includes computer program instructions, which, when executed on a computer (for example, a display device), cause the computer to perform the brightness adjustment method of the display device according to any one of the above-described embodiments.

[0222] Some embodiments of the present disclosure also provide a computer program. When the computer program is executed on a computer (for example, a display device), the computer program causes the computer to perform the brightness adjustment method of the display device according to any one of the above-described embodiments.

[0223] The computer readable storage medium, the computer program product and the computer program have the same beneficial effects as the display device and the brightness adjustment method of some embodiments described above, and will not be repeated here.

[0224] The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto, any person skilled in the art can think of changes or replacements within the technical range disclosed by the present disclosure, which should be covered within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A display device, comprising: an input device configured to acquire an initial gray scale of a display picture; a processor configured to tone the initial gray scale of the display picture by using a first display data lookup table (LUT); an output device including a display module, and the output device is configured to output a toned display picture, the toned display picture satisfying a DICOM GSDF standard, and a contrast response value of the toned display picture being less than or equal to 11 percent; wherein the first LUT includes at least one first LUT value, and the at least one first LUT value satisfies the following relationship: wherein, j=0, 1, 2, …, N-1, N=2 X T(j) is a first LUT value corresponding to the jth gray scale in the first LUT, L(j) is a second LUT value corresponding to the jth gray scale in the second LUT, and L min (j) is a third LUT value corresponding to the jth gray scale in the third LUT. max (j) is a luminance value of the jth gray scale obtained through the DICOM GSDF standard, K(j) is an intermediate value when calculating T(j), L min (j) is a minimum luminance value of the display module, L max (j) is a maximum luminance value of the display module, j is a gray scale value of the first LUT at the jth gray scale, j max is a maximum gray scale value of the first LUT, X is a bit number that the processor can adjust, X' is a bit number of the display module, and a is a correction coefficient.

2. The display device according to claim 1, wherein a value range of the correction coefficient a is 2.225-2.

245.

3. The display device according to claim 1, wherein a value range of the correction coefficient a is 2.230-2.

240.

4. The display device according to claim 1, wherein the value of the correction coefficient a is 2.

235.

5. The display device according to claim 1, wherein a bit number available to the processor is greater than or equal to a bit number of the display module.

6. The display device of claim 5, wherein, the bit number available to the processor is 10, and the bit number of the display module is 8 or 10. 7.The display device of claim 1, further comprising: a signal converter configured to change a bit number of the toned display picture when the bit number of the toned display picture is inconsistent with a bit number of the display module, so that the bit number of the toned display picture is equal to the bit number of the display module. 8.The display device of claim 1, further comprising: a gray scale converter configured to change a bit number of an input display picture when the bit number of the input display picture is inconsistent with a bit number available to the processor, so that the bit number of the input display picture is equal to the bit number available to the processor. 9.The display device of any one of claims 1-8, wherein the processor is further configured to tone the initial gray scale of the display picture by using a second LUT, and the second LUT is different from the first LUT.

10. The display device of claim 9, wherein, the second LUT makes the toned display picture satisfy a GAMMA curve. 11.The display device of claim 9, wherein the processor is further configured to switch the first LUT and the second LUT, and tone the initial gray scale of the display picture by using the first LUT or the second LUT. 12.The display device of claim 9, wherein the processor is configured to tone the initial gray scale of a display picture of a first display area of the display module by using the first LUT, and tone the initial gray scale of a display picture of a second display area of the display module by using the second LUT.

13. The display device of claim 12, wherein, the first display area and the second display area do not overlap, and a display picture of the display module is completely divided by the first display area and the second display area. 14.The display device of claim 1, further comprising: a brightness sensing device configured to detect a brightness value of a display side of the display module. The processor is further configured to determine a brightness change of the display module display side according to the brightness value of the display module display side, and adjust the actual display brightness of the display module if the brightness change of the display module display side is not within a first threshold range.

15. The display device of claim 1, further comprising: a brightness acquisition device coupled to the processor and configured to acquire a brightness value of an environment in which the display module display side is located; The processor is further configured to adjust the actual display brightness of the display module according to the brightness value of the environment in which the display module display side is located.

16. The display device of claim 14 or 15, wherein The processor is configured to adjust a duty cycle of pulse width modulation (PWM) of the light emitting element corresponding to each gray scale of the display module.

17. The display device of any one of claims 1-8, wherein, K(j) is a result of rounding off the actual calculated value on the right side of the equal sign of formula (1-1), and the rounding off operation occurs at the first, second or third digit after the decimal point of the actual calculated value on the right side of the equal sign of formula (1-1).

18. A brightness adjustment method of a display device, comprising: obtaining an initial gray scale of a display picture; adjusting the color of the initial gray scale of the display picture by using a first display data lookup table (LUT); outputting the adjusted display picture, wherein the adjusted display picture meets the DICOM GSDF standard, and the contrast response value of the adjusted display picture is less than or equal to 11 percent; The first LUT includes at least one first LUT value, and the at least one first LUT value satisfies the following relationship: wherein, j=0, 1, 2, …, N-1, N=2 X T(j) is a first LUT value corresponding to the jth gray scale in the first LUT, L(j) is a second LUT value corresponding to the jth gray scale in the second LUT, and L min (j) is a third LUT value corresponding to the jth gray scale in the third LUT. max (j) is a luminance value of the jth gray scale obtained by the DICOM GSDF standard, K(j) is an intermediate value when calculating T(j), L min (j) is a minimum luminance value of the display module, L max (j) is a maximum luminance value of the display module, j is a gray scale value of the first LUT at the jth gray scale, j max is a maximum gray scale value of the first LUT, X is a bit number that the processor can adjust, X' is a bit number of the display module, and a is a correction coefficient.

19. The method of claim 18, further comprising: switching the first LUT and a second LUT; adjusting the color of the initial gray scale of the display picture by using the first LUT or the second LUT, wherein the second LUT makes the adjusted picture meet a GAMMA curve.

20. The method of claim 18, wherein, K(j) is a result of rounding off the actual calculated value on the right side of the equal sign of formula (1-1), and the rounding off operation occurs at the first, second or third digit after the decimal point of the actual calculated value on the right side of the equal sign of formula (1-1).

Images