CN115985901A

CN115985901A - Light-emitting substrate, optical compensation method thereof and related equipment

Info

Publication number: CN115985901A
Application number: CN202310004686.0A
Authority: CN
Inventors: 金美灵; 高博; 田超; 胡国锋; 陈振彰; 张谦; 刘晨凯; 钱学海; 刘小舟; 孙元浩; 张宝新
Original assignee: BOE Technology Group Co Ltd; BOE Jingxin Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; BOE Jingxin Technology Co Ltd
Priority date: 2023-01-03
Filing date: 2023-01-03
Publication date: 2023-04-18

Abstract

The disclosure provides a light emitting substrate, an optical compensation method thereof and related equipment. The light-emitting substrate comprises a plurality of light-emitting units arranged in an array manner and at least one temperature measuring unit arranged on one side of at least one light-emitting unit, wherein the temperature measuring unit is configured to detect the temperature of the light-emitting substrate so as to optically compensate the light-emitting unit corresponding to the position of the temperature measuring unit according to the temperature.

Description

Light-emitting substrate, optical compensation method thereof and related equipment

Technical Field

The present disclosure relates to the field of display technologies, and in particular, to a light-emitting substrate, an optical compensation method thereof, and a related device.

Background

A Micro light emitting diode (Micro LED) generally refers to a Micro LED chip with a size reduced to a size within 100 micrometers based on a conventional Micro LED chip structure, and red, green and blue Micro LEDs are arranged on a Thin Film Transistor (TFT) or a Complementary Metal Oxide Semiconductor (CMOS) according to a certain rule, so as to form a Micro device capable of realizing full-color display.

The display has the advantages of independent light emitting control, high brightness, low power consumption, ultrahigh resolution, color saturation and the like, can realize flexible and transparent display, and is just the next generation core product in the display field because the Micro-LED uses inorganic materials, has simple structure and excellent service life and reliability.

However, the inventors of the present disclosure found that the light emitting performance of the Micro LEDs varies with temperature, resulting in different light emitting effects of the Micro LEDs driven with the same parameters when the temperature is different, thereby possibly causing color shift.

Disclosure of Invention

Embodiments of the present disclosure provide a light emitting substrate, an optical compensation method thereof, and a related apparatus, so as to solve or partially solve the above problems.

In a first aspect of the present disclosure, a light emitting substrate is provided, which includes a plurality of light emitting units arranged in an array and at least one temperature measuring unit disposed on one side of at least one of the light emitting units, where the temperature measuring unit is configured to detect a temperature of the light emitting substrate so as to optically compensate the light emitting unit corresponding to a position where the temperature measuring unit is located according to the temperature.

In a second aspect of the present disclosure, there is provided a method for optical compensation of a light emitting substrate including a plurality of light emitting cells arranged in an array, the method comprising:

acquiring the temperature of a target position of the light-emitting substrate and a target optical parameter of a target light-emitting unit corresponding to the target position;

determining a target electrical parameter of the target light-emitting unit according to the target optical parameter;

determining the current optical parameters of the target light-emitting unit according to the target electrical parameters and the temperature;

determining a compensation parameter of the target light-emitting unit according to the current optical parameter and the target optical parameter;

and optically compensating the target light-emitting unit according to the compensation parameter.

In a third aspect of the present disclosure, there is provided an optical compensation apparatus for a light emitting substrate, the light emitting substrate including a plurality of light emitting cells arranged in an array, the apparatus including:

an acquisition module, configured to acquire a temperature of a target position of the light-emitting substrate and a target optical parameter of a target light-emitting unit corresponding to the target position;

the calculation module is used for determining the electrical parameters of the target light-emitting unit according to the target optical parameters; determining the current optical parameters of the target light-emitting unit according to the electrical parameters and the temperature; determining a compensation parameter of the target light-emitting unit according to the current optical parameter and the target optical parameter;

and the compensation module is used for carrying out optical compensation on the target light-emitting unit according to the compensation parameter.

In a fourth aspect of the present disclosure, there is provided a display device including:

the light-emitting substrate according to the first aspect; and

a control module coupled with the light emitting substrate and provided with the optical compensation device as described in the third aspect.

In a fifth aspect of the present disclosure, a computer device is provided, including:

the light-emitting substrate comprises a plurality of light-emitting units arranged in an array;

one or more processors, memory; and

one or more programs;

wherein the one or more programs are stored in the memory and executed by the one or more processors, the programs including instructions for performing the method according to the second aspect.

A sixth aspect of the disclosure provides a non-transitory computer readable storage medium containing a computer program which, when executed by one or more processors, causes the processors to perform the method of the second aspect.

A seventh aspect of the disclosure provides a computer program product comprising a computer readable storage medium having stored thereon instructions that, when executed, cause at least one central processor unit of a computing device to perform the method according to the second aspect.

According to the light-emitting substrate, the optical compensation method and the related equipment, the temperature of the light-emitting substrate is detected so as to optically compensate the light-emitting unit corresponding to the position of the temperature measuring unit according to the temperature, so that the light-emitting substrate can be optically compensated according to the change of the temperature, and the light-emitting effect is improved.

Drawings

In order to clearly illustrate the technical solutions of the present disclosure or related technologies, the drawings used in the embodiments or related technologies description will be briefly introduced below, and obviously, the drawings in the following description are only embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1A shows the spectral variation curves of white LEDs at different temperatures.

Fig. 1B shows the wavelength of the green micro-leds as a function of current.

Fig. 2A shows a schematic structural diagram of an exemplary light emitting substrate provided by an embodiment of the present disclosure.

Fig. 2B illustrates a schematic top-view structure of an exemplary light emitting substrate according to an embodiment of the present disclosure.

Fig. 2C illustrates a schematic top view structure of another exemplary light emitting substrate according to an embodiment of the present disclosure.

Fig. 2D illustrates a schematic top view structure of yet another exemplary light emitting substrate according to an embodiment of the present disclosure.

Fig. 3A illustrates a flow diagram of an exemplary method provided by an embodiment of the present disclosure.

Fig. 3B illustrates a flow diagram of another exemplary method provided by an embodiment of the present disclosure.

Fig. 3C illustrates a flow diagram of yet another exemplary method provided by an embodiment of the present disclosure.

Fig. 4 illustrates a schematic diagram of an exemplary apparatus provided by an embodiment of the present disclosure.

Fig. 5A illustrates a schematic block diagram of an exemplary display device provided in an embodiment of the present disclosure.

Fig. 5B illustrates a schematic structural diagram of an exemplary display device provided by an embodiment of the present disclosure.

Fig. 5C illustrates a schematic block diagram of another exemplary display device provided in an embodiment of the present disclosure.

Fig. 5D illustrates an internal structure diagram of an exemplary display driver chip according to an embodiment of the present disclosure.

Fig. 6 shows a hardware structure diagram of an exemplary computer device provided by the embodiment of the present disclosure.

Detailed Description

For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.

It is to be noted that technical terms or scientific terms used in the embodiments of the present disclosure should have a general meaning as understood by one having ordinary skill in the art to which the present disclosure belongs, unless otherwise defined. The use of "first," "second," and similar terms in the embodiments of the disclosure is not intended to indicate any order, quantity, or importance, but rather to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item preceding the word comprises the element or item listed after the word and its equivalent, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

When the light-emitting substrate works, due to the fact that display contents are changed, the structure positions are different, heat dissipation speed is possibly different, and therefore the local temperature of the light-emitting substrate is possibly different. Due to the different temperatures, the light emitting units at different positions of the light emitting substrate have different light emitting properties, for example, different color temperatures. Fig. 1A shows the spectral change of a white LED at different temperatures. As can be seen from fig. 1A, as the temperature increases, the LED spectrum is red-shifted, i.e., in the visible band, the spectral lines of the spectrum are shifted toward the red end (the side of the spectrum corresponding to the wavelength of red light) by a certain distance, i.e., the wavelength is longer and the frequency is lower. This phenomenon finally results in poor uniformity of the light-emitting substrate, and is more noticeable particularly when a white screen is displayed, and the phenomenon is manifested in that some portions are reddish and some portions are bluish. This problem is particularly pronounced in some embodiments when Chip On Glass (COG) technology is used, where the temperature conduction of the light emitting substrate is faster. The cross-grid problem is currently a major issue for COG substrates.

Further, when a Micro light emitting diode (Micro LED) is driven with a small current, the center of gravity wavelength of the Micro LED becomes smaller as the current increases. Therefore, when the gray scale is controlled by changing the current density under the low gray scale driving, color shift is easily generated in images of different gray scales. Taking the green micro LED as an example, as shown in FIG. 1B, when a small current is applied (for example, the current density is 5A/cm) ² Hereinafter), the wavelength of the green micro-leds becomes smaller with the increase of the current, resulting in the higher gray scale, the higher the required current density, the smaller the wavelength of the center of gravity, the more blue the green light is outputted, and thus the color shift is generated.

In summary, the characteristics of the LED itself cause display unevenness and color shift at different temperatures and different current densities, which seriously affect the light emitting effect of the light emitting substrate.

In view of this, an embodiment of the present disclosure provides a light-emitting substrate, including a plurality of light-emitting units arranged in an array and at least one temperature measurement unit disposed on one side of at least one of the light-emitting units, where the temperature measurement unit is configured to detect a temperature of the light-emitting substrate to optically compensate the light-emitting unit corresponding to a position where the temperature measurement unit is located according to the temperature, so that the light-emitting substrate can optically compensate according to a change in the temperature, thereby improving a light-emitting effect.

Fig. 2A illustrates a partial structural schematic of an exemplary light emitting substrate 200 according to an embodiment of the present disclosure.

As shown in fig. 2A, the light-emitting base plate 200 may include a substrate base plate 202, and the light-emitting unit 204 and the temperature measuring unit 206 may be disposed on the substrate base plate 202. In some embodiments, the light emitting unit 204 may be a Light Emitting Diode (LED), a sub-millimeter light emitting diode (Mini LED), or a Micro light emitting diode (Micro LED). In some embodiments, the light emitting substrate 200 may be a display substrate, and the light emitting unit 204 may be a sub-pixel (or sub-pixel) of the display substrate. As an alternative embodiment, the sub-pixels may be Micro LEDs, so that the display substrate may have advantages of independent light emission control, high brightness, low power consumption, ultra-high resolution, color saturation, and the like. Alternatively, the thermometric unit 206 may be a temperature sensor.

Fig. 2B illustrates a schematic top view of an exemplary light emitting substrate 200 according to an embodiment of the present disclosure.

As shown in fig. 2B, the light emitting substrate 200 may include a plurality of light emitting cells 204 arranged in an array. As an alternative embodiment, the light emitting substrate 200 may be a display substrate, and may further include a plurality of pixel units including at least one of the light emitting units 204. As shown in fig. 2B, one pixel unit may include three light emitting units, which further include a red light emitting unit 204A, a green light emitting unit 204B and a blue light emitting unit 204C, so that one pixel unit may further form full-color light, thereby completing the display of the display substrate.

In some embodiments, as shown in fig. 2B, the light-emitting substrate 200 may further include at least one temperature measurement unit 206 disposed on one side of at least one of the light-emitting units 204, and the temperature measurement unit 206 is configured to detect a temperature of the light-emitting substrate 200 to optically compensate the light-emitting unit 204 corresponding to a position of the temperature measurement unit 206 according to the temperature, so that the light-emitting substrate 200 may optically compensate according to a change in the temperature, thereby improving a light-emitting effect.

In some cases, there may be a certain regularity in the temperature distribution of the light-emitting substrate 200 in the operating state, for example, the temperature changes are more severe in some regions and less severe in other regions, and therefore, in some embodiments, the temperature measurement unit 206 may be arranged according to the temperature distribution of the light-emitting substrate 200 in the operating state. As an alternative embodiment, as shown in fig. 2B, the light emitting substrate 200 includes a first region 202A located in the middle and a second region 202B disposed around the first region 202A, and considering that the first region 202A in the middle is insensitive to temperature changes and the second region 202B around is more sensitive to temperature changes, the distribution density of the temperature measurement unit 206 in the second region 202B may be greater than that in the first region 202A. In other words, as shown in FIG. 2B, the thermometric units 206 are more densely distributed in the second area 202B, and more sparsely distributed in the first area 202A. Therefore, on one hand, the temperature of the temperature sensitive area can be more accurately detected, and on the other hand, fewer temperature measuring units 206 are arranged in the temperature insensitive area, so that the cost can be saved, and the structure can be simplified.

In some embodiments, the temperature of the light-emitting substrate may be simulated in advance to obtain a temperature distribution model of the light-emitting substrate, and then the temperature measurement unit 206 is set based on the temperature distribution model, so that the balance between accurate temperature measurement and the reduction of the number of devices can be more reasonably realized.

Fig. 2C illustrates a schematic top view of another exemplary light emitting substrate 200 according to an embodiment of the present disclosure.

As shown in fig. 2C, the light-emitting substrate 200 may be divided into a plurality of regions (the dotted lines are dividing lines), and one or a group of temperature measuring units may be disposed in each region, in other words, the temperature measuring units correspond to the regions one by one. Thus, the temperature measurement units 206 are uniformly arranged in the block areas of the light-emitting substrate 200, so that the number of the temperature measurement units is reduced, the cost is reduced, and the structure is simplified on the basis of ensuring the temperature measurement.

Fig. 2D shows a schematic top view of another exemplary light emitting substrate 200 according to an embodiment of the present disclosure.

As shown in fig. 2D, the thermometric units 206 may be disposed in one-to-one correspondence with the pixel units, in other words, when the light-emitting substrate 200 is a display substrate, one thermometric unit 206 is disposed for each pixel, so that the test temperature is more accurate, and optical compensation can be performed based on the temperature collected in real time in units of pixels. It is understood that when the light-emitting substrate 200 is used as a backlight source in a backlight module of a liquid crystal display panel, the temperature measuring units 206 may be disposed in one-to-one correspondence with the light-emitting units 204, so that optical compensation may be performed based on the temperature collected in real time in units of the light-emitting units 204.

In the foregoing embodiments, the temperature measuring unit 206 may be a separately disposed device, and in some embodiments, for the sake of simplifying the structure, the temperature measuring unit 206 may be considered to be integrated with other devices. As shown in fig. 2A to 2D, the light-emitting substrate 200 may further include a driving unit 208 (e.g., an LED driving chip) for driving the light-emitting unit 204, and the temperature measuring unit 206 is integrated inside the driving unit 208, so that two functions are simultaneously implemented in the same device, the structure can be further simplified, and the detection of the temperature is ensured. As an alternative embodiment, a driving chip with a temperature measurement function may be used as the driving unit 208, so that two functions can be simultaneously performed.

It can be seen from the above embodiments that, according to the light-emitting substrate provided by the embodiments of the present disclosure, the temperature of the light-emitting substrate can be monitored by the temperature measurement unit, and then the temperature can be used for performing optical compensation, so that the light-emitting effect is improved.

The embodiment of the present disclosure further provides an optical compensation method for a light emitting substrate, which is used for performing optical compensation on the light emitting substrate to improve a light emitting effect.

For a pixel unit, the calculation formula of the gray scale value of the red, green and blue sub-pixels is as follows:

wherein, in an ideal state, L0=0, L255 is the maximum luminance, L _R255 Maximum brightness of red light, L _G255 Maximum brightness of green light, L _B255 The maximum brightness of blue light, gamma is a Gamma value, and k, m and n are the current gray levels of the red, green and blue sub-pixels.

The three primary colors can synthesize all colors including monochromatic light. Since the spectrum of the white light is not equal to the brightness of the light in each wavelength band, taking the example of mixing the three primary colors into the white light, the brightness of the light of the three primary colors is different when the different light to be matched is obtained. Assume that a certain color can be expressed as: f = R (R) + G (G) + B (B), and (R) =1lm, (G) =4.5907lm, (B) =0.0601lm represent the unit amounts of the three primary colors of red, green, and blue that produce a mixed color in the CIE1931-RGB system; i.e. F = R +4.5907g +0.0601b, where R, G, B are the mixing ratio of the colors, when R = G = B, standard white light can be obtained.

The color coordinates (chromaticity coordinates) are the coordinates of the color. The color coordinates are usually used, and in the chromaticity diagram, the horizontal axis is x and the vertical axis is y. With the color coordinates, a point on the chromaticity diagram can be determined which accurately represents the emitted color. Let the color coordinates of red, green and blue lights be (x) _R ，y _R )，(x _G ，y _G )，(x _B ，y _B ) By calculation, the relationship between the color coordinates (x, y) and R, G, B, γ is as follows:

the thermal model parameters of the Micro LEDs obtained by extraction from the test using the Micro LEDs are shown in table 1 below.

TABLE 1Micro LED thermal model parameters

The spectral intensity I can be obtained according to the thermal model parameters of the Micro LED ₀₁ Spectral peak intensity I ₀₂ And temperature T _j The relationship of (c):

I ₀₁ ＝0.7642×(-0.005696×T _j +1.142)

I ₀₂ ＝1.066×(-0.009176×T _j +1.221)

from the spectral intensities, optical data such as luminance, color shift, etc. can be calculated.

To calculate the color coordinates, the tristimulus values of the colors need to be obtained first, as follows:

wherein, the lambda is the wavelength, the range can be 380-780 nm,

in function of color stimulus, i.e. the light energy entering the human eye which produces a color sensation>

Is the spectral tristimulus value of the CIE specified standard colorimetric observations and k is the normalization factor.

The calculation formula of (c) is as follows:

where τ (λ) is the spectral transmittance of the object and S (λ) is the relative spectral power distribution of the illumination source, both of which can be calculated based on the spectral parameters calculated by the foregoing equations.

The Y value of the selected standard illuminant is adjusted to 100, and the normalization factor k can be obtained by the following formula:

after the tristimulus values XYZ are calculated, the color coordinates can be found based on the following formula:

by combining the above calculation formulas, it can be known that, based on Micro LED characteristics and product design, color coordinates (x, y) are different at different current densities and temperatures, and can be characterized as:

it can be seen that the color coordinates of a light emitting cell with a gray scale of k is a function of current density and temperature.

Fig. 3A illustrates a flow diagram of an exemplary method 300 provided by an embodiment of the present disclosure.

The method 300 may be applied to any embodiment or arrangement and combination of embodiments of the light emitting substrate 200, as shown in fig. 3A, and the method 300 may further include the following steps.

In step 302, a temperature of a target position of the light-emitting substrate and a target optical parameter of a target light-emitting unit corresponding to the target position are acquired.

As shown in fig. 2B, the temperature measuring unit 206 can measure the temperature of the light emitting substrate at the position where the temperature measuring unit is disposed and transmit the measured temperature to an external control circuit via corresponding wires for calculation. Alternatively, when the temperature measuring unit 206 is a temperature sensor, the temperature sensor may generate an electrical parameter related to temperature to be transmitted to the external control circuit, and the temperature data is calculated by the external control circuit.

The target light-emitting unit corresponding to the target position can be determined according to the arrangement rule of the temperature measuring units. For example, taking fig. 2B as an example, the corresponding relationship between the temperature measuring unit and the light emitting unit can be determined according to the distance between the temperature measuring unit and the light emitting unit. For example, the distance between the light-emitting unit and the neighboring temperature measurement units around the light-emitting unit may be calculated, and the temperature measurement unit closest to the light-emitting unit may be selected to correspond to the light-emitting unit on the entire light-emitting substrate, so that the light-emitting unit may correspond to one temperature measurement unit, and then the light-emitting unit may be optically compensated based on the temperature data measured by the temperature measurement unit.

After determining the target lighting unit corresponding to the target position, the target optical parameters of the target lighting unit, that is, the optical parameters that the target lighting unit needs to achieve in an ideal state, may be further determined. As an alternative embodiment, the target optical parameter may be determined from display data of a display device to which the light-emitting substrate belongs. Alternatively, the target optical parameters may be target color coordinates and target gray scales of the target light emitting unit. Because the picture display of the pixels can be realized through the R, G and B gray scale proportion of each pixel, the target color coordinate and the target gray scale of the pixel can be obtained from a driving chip of the display device.

In step 304, a target electrical parameter of the target light-emitting unit is determined according to the target optical parameter.

When the light emitting substrate is driven, a target electrical parameter to be provided to the target light emitting unit may be determined according to a target optical parameter thereof, and ideally, the target electrical parameter is identical to an actual electrical parameter.

Alternatively, the target current density of the target light emitting unit may be calculated according to the target gray scale as the target electrical parameter. The relationship between the gray scale and the current density is related to information such as the characteristics of the LED and the pitch (pitch) of the product, and can be calculated by combining the known characteristics of the LED with the pitch of the product. In some embodiments, the test may be performed in advance, a table of relationship between gray scale and current density is stored, and then the target current density is obtained by table lookup.

In step 306, a compensation parameter of the target light emitting unit is determined according to the target electrical parameter and the temperature. Then, in step 308, the target light-emitting unit is optically compensated according to the compensation parameter.

In some embodiments, determining a compensation parameter for the target light emitting cell based on the target electrical parameter and the temperature comprises: determining the current optical parameters of the target light-emitting unit according to the target electrical parameters and the temperature; and determining a compensation parameter of the target light-emitting unit according to the current optical parameter and the target optical parameter.

As an alternative embodiment, the current optical parameter of the target light emitting unit may be determined from the target electrical parameter and the temperature by means of a look-up table.

For example, color coordinate data tests of different temperatures and different current densities may be performed in advance, and a table of correspondence between different temperatures, different current densities, and color coordinates may be obtained and stored, as shown in table 2.

TABLE 2 Compensation watch

And finding the current optical parameters, namely color coordinates, of the target light-emitting unit from the table 2 according to the target electrical parameters and the temperature in a table look-up manner.

After the current optical parameter and the target optical parameter are known, a compensation parameter may be calculated based on the difference between the two. For example, a current density increment of the target light-emitting unit is calculated based on a difference between the present optical parameter and the target optical parameter, and then optical compensation is performed based on the current density increment, for example, the current density increment is superimposed on the present current density of the target light-emitting unit and then supplied to the target light-emitting unit, thereby completing the optical compensation.

In some embodiments, the compensation parameter may also be determined by means of a table lookup. Thus, determining the compensation parameter from the target optical parameter and the temperature comprises: based on the target optical parameter and the temperature, a corresponding compensation parameter is looked up in a preset look-up table (e.g., table 2).

For example, since the target color coordinates of the target light-emitting unit are known, the current density corresponding to the target color coordinates can be found from table 2 according to the target color coordinates and the current temperature as the compensation parameter, that is, the current density corresponding to the target color coordinates in table 2 is directly provided to the target light-emitting unit, so as to complete the optical compensation.

In some embodiments, in order to minimize the calculation amount, a preset threshold may be set for the difference between the optical parameters, and then the difference between the current optical parameter and the target optical parameter is compared with the preset threshold, and when the difference exceeds the preset threshold, the optical compensation is performed, so that the calculation amount required by the optical compensation can be reduced. The preset threshold may be set as needed, for example, a difference value that is not easy to affect the light emitting effect is selected as the preset threshold according to the test result.

Therefore, in particular, the step of determining a compensation parameter of the target light-emitting unit according to the current optical parameter and the target optical parameter may further comprise:

determining whether the difference value between the current optical parameter and the target optical parameter is greater than a preset threshold value;

in response to determining that the difference between the current optical parameter and the target optical parameter is greater than a preset threshold, determining the compensation parameter according to the target optical parameter and the temperature; or

In response to determining that the difference between the current optical parameter and the target optical parameter is less than or equal to a preset threshold, not optically compensating the target light-emitting unit.

In some embodiments, determining a compensation parameter of the target light emitting unit according to the target electrical parameter and the temperature may include: determining whether the target electrical parameter is greater than a preset parameter threshold and whether the temperature is greater than a preset temperature threshold; in response to determining that the target electrical parameter is greater than a preset parameter threshold and the temperature is greater than a preset temperature threshold, determining the compensation parameter based on the target optical parameter and the temperature; or, in response to determining that the target electrical parameter is less than a preset parameter threshold or the temperature is less than a preset temperature threshold, not optically compensating the target light-emitting unit.

In the display field, the RGB values of a display are not simply linear but power functions, the exponent of the function is called the Gamma value, which is generally 2.2, and the scaling process is called Gamma correction.

Let the color coordinates of red, green and blue light be (x) _R ，y _R )，(x _G ，y _G )，(x _B ，y _B ) The relationship between the color coordinates (x, y) and R, G, B, γ is calculated as follows:

therefore, in this embodiment, the Gamma value can be adjusted without compensating the current density, and the color coordinates can also be adjusted.

Firstly, color coordinate data at different temperatures and current densities can be tested in advance and stored.

Then, according to the color coordinate offset data of the light-emitting substrate 200, which is tested in advance and changes with the temperature and the current density, the preset temperature and current density threshold values required for reaching the target color coordinate, and the corresponding optimal Gamma values and reference currents thereof at different temperatures and within the current density threshold value range are determined. The current density threshold value corresponds to the optimal Gamma value corresponding to the current density and the reference current thereof, and one or more groups can be provided. And the optimal Gamma values for the current density range after the one or more sets exceed the current density threshold value may be prestored. It can be understood that when the pre-stored data is a plurality of sets, the optimal Gamma values corresponding to different current density ranges are different, that is, when the current density is in different current density ranges, the corresponding optimal Gamma values are different.

Then, the temperature of the corresponding target light emitting unit may be obtained from the temperature measuring unit, and the driving current of the target light emitting unit may be obtained from the display data (similarly, the data of the current may also be obtained by the display driving IC).

And then, judging whether the temperature and the current density exceed a preset temperature threshold value and a preset current density threshold value, if not, using the current Gamma value and the reference current thereof to realize driving, and then displaying normally.

If the temperature and the current density are judged to exceed the preset temperature threshold value and the preset current density threshold value, the optimal Gamma value corresponding to the current density range can be taken as a compensation parameter, and then the optimal driving current is obtained based on the compensation parameter, so that the optimal display is realized.

In some embodiments, the foregoing steps of testing the color coordinate data at different temperatures and current densities and determining the preset temperature and current density threshold required for reaching the target color coordinate, and the corresponding optimal Gamma value and reference current thereof within the range of the current density threshold at different temperatures according to the color coordinate offset data of the light-emitting substrate 200 tested in advance, which varies with the temperature and the current density, may be performed in real time, so as to improve the refresh rate of the calculated frequency and the Gamma value. Namely testing the color coordinate offset data of the light-emitting substrate changing along with the display time in real time; according to the color coordinate offset data, calculating the optimal Gamma value which can compensate the color coordinate offset and drive the display panel to display and the reference current thereof in real time; and then, the optimal Gamma value obtained by calculation and the reference current thereof are provided for a driving circuit in real time, so that the real-time compensation of the color coordinate offset of the display panel is realized. The refresh rate of this embodiment is improved compared to the previous embodiments and can be 1 frame (60 minutes of a second) to 1 minute.

Compared with the present embodiment, the refresh frequency of the foregoing embodiment is greater than 1 minute, but the refresh is too fast, which results in too long operating time, and at the same time, the temperature change of the panel in a short time is not so great, and the human eye does not recognize the display deviation caused by the temperature and current density change, so that the refresh can be selected to be in 15 minutes or half an hour.

It can be seen from the foregoing embodiments that, in the optical compensation method for a light-emitting substrate provided in the embodiments of the present disclosure, the current density of the corresponding pixel is obtained through displaying the gray scale, the temperature of the pixel point is obtained through monitoring, the current color coordinate of the pixel point is obtained through real-time calculation using the color coordinate algorithm of the embodiments of the present disclosure, and whether the current color coordinate reaches the threshold affecting the display is determined by comparing the current color coordinate with the target information, and the Micro LED display panel is compensated and corrected according to the determination result, so that the display deviation of the display panel caused by the change of the temperature and the current density at different gray scales can be compensated, and the display effect of the display panel is optimized.

It should be noted that the method of the embodiments of the present disclosure may be executed by a single device, such as a computer or a server. The method of the embodiment can also be applied to a distributed scene and is completed by the mutual cooperation of a plurality of devices. In such a distributed scenario, one of the devices may only perform one or more steps of the method of the embodiments of the present disclosure, and the devices may interact with each other to complete the method.

It should be noted that the above describes some embodiments of the disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments described above and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.

Fig. 3B illustrates a flow diagram of another exemplary method 310 provided by an embodiment of the present disclosure.

The method 310 may be applied to any embodiment or arrangement and combination of embodiments of the light emitting substrate 200, as shown in fig. 3B, and the method 310 may further include the following steps.

In step 312, driving data of the light emitting substrate 200 is acquired. Alternatively, when the light emitting substrate 200 is a display panel, display data may be acquired to obtain driving data of the light emitting substrate 200.

Target optical parameters of the light emitting cells 204 of the light emitting substrate 200, such as target color coordinates and target gray scales, may be included in the driving data.

In step 314, the temperature of the target position of the light-emitting substrate 200 is acquired. Alternatively, the temperature data may be acquired by the temperature measurement unit 206 as the temperature of a target position, which is associated with the set position of the temperature measurement unit 206. When acquiring the temperature of the target position, the target optical parameter of the target light-emitting unit corresponding to the target position may be determined according to the target optical parameter acquired in the previous step.

In step 316, a target electrical parameter of the target light-emitting unit is determined according to the target optical parameter. For example, a target current density of the target light emitting cell is calculated according to the target gray scale.

In step 318, the current optical parameters of the target light-emitting unit are determined according to the target electrical parameters and the temperature. Alternatively, the target current density and the current color coordinate corresponding to the temperature, that is, the actual color coordinate corresponding to the target current density at the current temperature, may be looked up from a preset lookup table.

In step 320, a compensation parameter of the target light-emitting unit is determined according to the current optical parameter and the target optical parameter. Optionally, the current color coordinate and the target color coordinate are compared, a difference between the current color coordinate and the target color coordinate is calculated, and if the difference exceeds a threshold, the corrected current density is searched for based on the target color coordinate and the temperature according to a preset lookup table.

In step 322, the target light-emitting unit is optically compensated according to the compensation parameter. Optionally, the target light-emitting unit is driven according to the corrected current density found in the foregoing step, so as to correct color shift and obtain a better display effect.

Fig. 3C illustrates a flow diagram of yet another exemplary method 330 provided by embodiments of the present disclosure.

The method 330 can be applied to any embodiment or arrangement and combination of embodiments of the light-emitting substrate 200, as shown in fig. 3C, and the method 330 can further include the following steps.

At step 332, the color coordinates and color coordinate shift data of the light emitting cells at different temperatures and different current densities are tested.

In step 334, a preset current density threshold is determined according to the color coordinates and the color coordinate offset data of the light emitting unit at different temperatures and different current densities.

At step 336, the corresponding optimal Gamma value is determined based on the color coordinates at different temperatures and within different current density ranges.

At step 338, one or more sets of optimal Gamma values corresponding to different temperatures and different current density ranges after exceeding the threshold are pre-stored.

In step 340, a current temperature of the target position of the light-emitting substrate is obtained.

In step 342, driving data of the light emitting substrate 200 is acquired. Alternatively, when the light emitting substrate 200 is a display panel, display data may be acquired to obtain driving data of the light emitting substrate 200. In this way, the target optical parameter of the target light-emitting unit corresponding to the target position can be acquired. A target electrical parameter, e.g. a target current density, of the target light-emitting unit may then be determined from the target optical parameter.

In step 344, it is determined whether the target current density is greater than a predetermined parameter threshold and the current temperature is greater than a predetermined temperature threshold. If yes, go to step 346, if no, go to step 350.

In step 346, the temperature and current density ranges corresponding to the current temperature and the target current density are retrieved, and then the corresponding optimal Gamma value is determined according to the ranges of the current temperature and the target current density.

In step 348, the driving current of the target light emitting cell of the light emitting substrate is obtained according to the optimal Gamma value.

In step 350, the light emitting substrate is driven using the present Gamma value and its reference current.

Thus, the optical compensation of the light-emitting substrate is completed, so that the color cast is corrected, and a better display effect is obtained.

The embodiment of the disclosure also provides an optical compensation device of the light-emitting substrate. Fig. 4 illustrates a schematic diagram of an exemplary apparatus 400 provided by an embodiment of the present disclosure. As shown in fig. 4, the apparatus 400 may be used to implement the method 300, and may further include the following modules.

An obtaining module 402, configured to obtain a temperature of a target position of the light-emitting substrate and a target optical parameter of a target light-emitting unit corresponding to the target position;

a calculating module 404, configured to determine an electrical parameter of the target light-emitting unit according to the target optical parameter; determining the current optical parameters of the target light-emitting unit according to the electrical parameters and the temperature; determining a compensation parameter of the target light-emitting unit according to the current optical parameter and the target optical parameter;

a compensation module 406, configured to perform optical compensation on the target light-emitting unit according to the compensation parameter.

According to the optical compensation device for the light-emitting substrate, the temperature of the light-emitting substrate is detected so that the light-emitting unit corresponding to the position of the temperature measuring unit can be optically compensated according to the temperature, so that the light-emitting substrate can be optically compensated according to the change of the temperature, and the light-emitting effect is improved.

For convenience of description, the above devices are described as being divided into various modules by functions, and are described separately. Of course, the functionality of the various modules may be implemented in the same one or more pieces of software and/or hardware in practicing the present disclosure.

The apparatus of the foregoing embodiment is used to implement the corresponding method 500 in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiment, which are not described herein again.

The embodiment of the present disclosure also provides a display device, which may include any one or any arrangement and combination of the foregoing light-emitting substrates 200, and may have corresponding technical effects. Alternatively, the light-emitting substrate 200 may be a display substrate in a display device, or may be a backlight source in a backlight module of the display device.

It is understood that the display device is a product having an image display function, and may be, for example: display, television, billboard, digital photo frame, laser printer with display function, telephone, mobile phone, personal Digital Assistant (PDA), digital camera, camcorder, viewfinder, navigator, vehicle, large-area wall, home appliance, information inquiry device (e.g. business inquiry device, monitor, etc. of the departments of e-government affairs, bank, hospital, electric power, etc.).

Fig. 5A illustrates a schematic diagram of a display device 500 provided by an embodiment of the present disclosure.

As shown in fig. 5A, the display device 500 may include a light emitting substrate 200 and a control module coupled to the light emitting substrate 200, the control module being configured to provide an electrical signal to the light emitting substrate 200. In some embodiments, when the light emitting substrate 200 provides a backlight source for the display device 500, the control module is configured to drive the light emitting substrate 200 by using a Local Dimming (Local Dimming) method, so that a better display effect can be obtained on the premise of lower cost.

In some embodiments, as shown in fig. 5A, the control module may further include a control motherboard 502 and a display driver chip 504. The display driving chip 504 may be disposed on the flexible circuit board 212 connected to the fan-out region 210 of the light emitting substrate 200 for implementing display driving, and the control main board 502 may be connected to the other end of the flexible circuit board 212 for providing a peripheral circuit, as shown in fig. 5B.

In some embodiments, as shown in fig. 5A, an optical compensation device 400 may be disposed in the control module for implementing optical compensation to the light emitting substrate.

The optical compensation device 400 may be an algorithm module integrated in a processor (e.g., a microprocessor MCU) of the control motherboard 502, or may be a separate chip. When the optical compensation device 400 is a separate chip, it can also be a separate chip or a combination of multiple separate chips. When the optical compensation apparatus 400 is implemented as a plurality of independent chips, the plurality of independent chips may further include three independent chips respectively used for implementing the obtaining module 402, the calculating module 404, and the compensating module 406 of the optical compensation apparatus 400. As an alternative embodiment, as shown in fig. 5B, the control main board may include a processor MCU and a color shift correction chip, and the color shift correction chip may further include the optical compensation apparatus 400; as shown in fig. 5B, the color shift correction chip is coupled to the processor and the light emitting substrate 200 respectively.

The color cast correction chip is configured to: receiving temperature information fed back by a temperature measuring unit 206 on the light-emitting substrate 200, and determining a compensation parameter according to the temperature information;

the processor configured to: receiving the compensation parameter and optically compensating the light emitting unit of the light emitting substrate 200 according to the compensation parameter. Alternatively, the processor may convert the compensation parameter into a driving signal to be provided to the display driving chip 504, thereby implementing optical compensation when driving the light emitting unit.

Optionally, the color shift correction chip includes one or more independent chips.

In some embodiments, the color shift correction chip may be disposed on the control main board 502. In this embodiment, the optical compensation device 400 can be customized as an independent color shift correction chip and placed on the control main board 502, so that the optical compensation function can be conveniently integrated for the display device, and the manufacturing process can be simplified.

As an alternative embodiment, as shown in fig. 5C, the optical compensation device 400 may be integrated in the display driving chip 504. Thus, integrating the optical compensation device 400 inside the display drive IC504 can make the structure of the display device simpler.

Fig. 5D shows an internal structural schematic diagram of an exemplary display driver chip 504 according to an embodiment of the disclosure.

As shown in fig. 5D, the display driving chip 504 may further include an optical compensation device 400, a timing control, a serial peripheral interface SPI, a LOGIC I/O BUFFER (LOGIC I/O BUFFER), a row control signal module, and a data signal module. The optical compensation device 400 may generate compensation DATA according to the temperature DATA collected by the temperature measurement unit 206, and then provide the compensation DATA to the DATA signal module, where the compensation DATA is converted into a DATA signal DATA by the DATA signal module and provided to the light-emitting substrate 200.

It is understood that other electrical components or elements may be included in the display device 500 in addition to those mentioned in the previous embodiments. As shown in fig. 5A, the display device 500 may further include a video source providing display data, a power supply for powering the display device 500. A power management chip (PMIC) may be further disposed in the control motherboard 502 for converting a voltage provided by a power supply into a power signal PWR to be provided to the light emitting substrate 200 and the display driving chip 504. A Microprocessor (MCU) for implementing processing functions may also be disposed in the control motherboard 502. The control motherboard 502 may communicate with the light-emitting substrate 200 through a Serial Peripheral Interface (SPI).

As can be seen from the foregoing embodiments, the display device provided in the embodiments of the present disclosure can optimize the display effect by performing color shift compensation and correction.

The display device provided by the embodiment of the disclosure can compensate the display device for display unevenness and color cast caused by current density change at different temperatures and different gray scales aiming at the problems of display unevenness and color cast caused by the characteristics of the MicroLED, so that the display effect of the display device is optimized.

The embodiment of the present disclosure further provides a computer device for implementing the method 300. Fig. 6 shows a hardware structure diagram of an exemplary computer device 600 provided by the embodiments of the present disclosure.

As shown in fig. 6, the computer device 600 may include: a processor 602, a memory 604, a network module 606, a peripheral interface 608, and a bus 610. The processor 602, memory 604, network module 606, and peripheral interface 608 are communicatively coupled to each other within the computer device 600 via bus 610.

The processor 602 may be a Central Processing Unit (CPU), an image processor, a neural Network Processor (NPU), a Microcontroller (MCU), a programmable logic device, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits. The processor 602 may be used to perform functions related to the techniques described in this disclosure. In some embodiments, processor 602 may also include multiple processors integrated into a single logic component. For example, as shown in FIG. 6, the processor 602 may include a plurality of processors 602a, 602b, and 602c.

The memory 604 may be configured to store data (e.g., instructions, computer code, etc.). As shown in fig. 6, the data stored by the memory 604 may include program instructions (e.g., for implementing the method 300 of embodiments of the present disclosure) as well as data to be processed (e.g., the memory may store configuration files for other modules, etc.). The processor 602 may also access the memory 604 to store program instructions and data and execute the program instructions to operate on the data to be processed. Memory 604 may include volatile memory devices or nonvolatile memory devices. In some embodiments, the memory 604 may include Random Access Memory (RAM), read Only Memory (ROM), optical disks, magnetic disks, hard disks, solid State Disks (SSDs), flash memory, memory sticks, and the like.

The network interface 606 may be configured to provide communications with other external devices to the computer device 600 via a network. The network may be any wired or wireless network capable of transmitting and receiving data. For example, the network may be a wired network, a local wireless network (e.g., bluetooth, wiFi, near Field Communication (NFC), etc.), a cellular network, the internet, or a combination of the above. It is to be understood that the type of network is not limited to the specific examples described above.

The peripheral interface 608 may be configured to connect the computer apparatus 600 with one or more peripheral devices to enable input and output of information. For example, the peripheral devices may include input devices such as keyboards, mice, touch pads, touch screens, microphones, various sensors, and output devices such as displays, speakers, vibrators, indicator lights, and the like.

The bus 610 may be configured to transfer information between various components of the computer device 600, such as the processor 602, the memory 604, the network interface 606, and the peripheral interface 608, such as internal buses (e.g., processor-memory buses), external buses (USB ports, PCI-E buses), and so forth.

It should be noted that although the architecture of the computer device 600 described above only shows the processor 602, the memory 604, the network interface 606, the peripheral interface 608, and the bus 610, in a specific implementation, the architecture of the computer device 600 may also include other components necessary for normal operation. Moreover, those skilled in the art will appreciate that the architecture of the computer device 600 described above may also include only the components necessary to implement the embodiments of the present disclosure, and need not include all of the components shown in the figures.

Based on the same inventive concept, the present disclosure also provides a non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the method 300 according to any of the above embodiments, corresponding to any of the above-described embodiment methods.

Computer-readable media, including both permanent and non-permanent, removable and non-removable media, for storing information may be implemented in any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device.

The computer instructions stored in the storage medium of the foregoing embodiment are used to enable the computer to execute the method 300 according to any embodiment, and have the beneficial effects of the corresponding method embodiment, which are not described in detail herein.

The present disclosure also provides a computer program product comprising a computer program, corresponding to any of the embodiment methods 300 described above, based on the same inventive concept. In some embodiments, the computer program is executable by one or more processors to cause the processors to perform the method 300. The processor executing the corresponding step may be the corresponding executing agent corresponding to the steps in the embodiments of the method 300.

The computer program product of the foregoing embodiment is used for enabling a processor to execute the method 300 according to any one of the foregoing embodiments, and has the advantages of the corresponding method embodiments, which are not described herein again.

Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the concept of the present disclosure, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present disclosure as described above, which are not provided in detail for the sake of brevity.

Additionally, well-known power/ground connections to the micro-driver circuit chips and other components may or may not be shown in the provided figures for simplicity of illustration and discussion, and so as not to obscure the embodiments of the disclosure. Further, devices may be shown in block diagram form in order to avoid obscuring embodiments of the disclosure, and also in view of the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the embodiments of the disclosure are to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the disclosure, it should be apparent to one skilled in the art that the embodiments of the disclosure can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.

While the present disclosure has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description. The disclosed embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalents, improvements, and the like that may be made within the spirit and principles of the embodiments of the disclosure are intended to be included within the scope of the disclosure.

Claims

1. The light-emitting substrate comprises a plurality of light-emitting units arranged in an array mode and at least one temperature measuring unit arranged on one side of at least one light-emitting unit, wherein the temperature measuring unit is configured to detect the temperature of the light-emitting substrate so as to optically compensate the light-emitting unit corresponding to the position of the temperature measuring unit according to the temperature.

2. The light-emitting substrate according to claim 1, wherein the at least one thermometric unit is arranged according to a temperature distribution of the light-emitting substrate in an operating state.

3. The light-emitting substrate of claim 2, wherein the light-emitting substrate comprises a first region located in the middle and a second region disposed around the first region, and the distribution density of the at least one thermometric unit in the second region is greater than that in the first region.

4. The light-emitting substrate according to claim 1, wherein the light-emitting substrate is divided into a plurality of regions, and the temperature measuring units correspond to the regions one to one; or alternatively

The light-emitting substrate is a display panel, the display panel comprises a plurality of pixel units, each pixel unit comprises at least one light-emitting unit, and the temperature measuring units correspond to the pixel units one to one.

5. The light-emitting substrate according to claim 1, wherein the light-emitting substrate further comprises a driving unit for driving the light-emitting unit, and the temperature measuring unit is integrated inside the driving unit.

6. A method of optical compensation of a light-emitting substrate comprising a plurality of light-emitting cells arranged in an array, the method comprising:

determining a compensation parameter of the target light-emitting unit according to the target electrical parameter and the temperature;

7. The method of claim 6, wherein determining a compensation parameter for the target light-emitting unit based on the target electrical parameter and the temperature comprises:

and determining a compensation parameter of the target light-emitting unit according to the current optical parameter and the target optical parameter.

8. The method of claim 7, wherein determining compensation parameters for the target lighting unit based on the current optical parameters and the target optical parameters comprises:

in response to determining that the difference between the current optical parameter and the target optical parameter is greater than a preset threshold, determining the compensation parameter based on the target optical parameter and the temperature.

9. The method of claim 7, wherein determining the compensation parameter as a function of the target optical parameter and the temperature comprises:

and searching a corresponding compensation parameter in a preset lookup table according to the target optical parameter and the temperature.

10. The method of claim 6, wherein determining a compensation parameter for the target light-emitting unit based on the target electrical parameter and the temperature comprises:

determining whether the target electrical parameter is greater than a preset parameter threshold and whether the temperature is greater than a preset temperature threshold;

in response to determining that the target electrical parameter is greater than a preset parameter threshold and the temperature is greater than a preset temperature threshold, determining the compensation parameter based on the target optical parameter and the temperature.

11. An optical compensation device of a light emitting substrate including a plurality of light emitting cells arranged in an array, the device comprising:

12. A display device, comprising:

the light-emitting substrate according to any one of claims 1 to 5; and

a control module coupled to the light emitting substrate and provided with the optical compensation apparatus of claim 11.

13. The display device of claim 12, wherein the control module comprises a control main board on which the optical compensation device is disposed; or alternatively

The control module comprises a display driving chip, and the optical compensation device is integrated in the display driving chip.

14. The display device of claim 13, wherein the control motherboard comprises a processor and a color shift correction chip, the color shift correction chip comprising the optical compensation device; the color cast correction chip is respectively coupled with the processor and the light-emitting substrate;

the color cast correction chip is configured to: receiving temperature information fed back by a temperature measuring unit on the light-emitting substrate, and determining a compensation parameter according to the temperature information;

the processor configured to: receiving the compensation parameter and carrying out optical compensation on a light-emitting unit of the light-emitting substrate according to the compensation parameter;

wherein, the color cast correction chip comprises one or more independent chips.

15. A computer device, comprising:

one or more processors, memory; and

one or more programs;

wherein the one or more programs are stored in the memory and executed by the one or more processors, the programs comprising instructions for performing the method of any of claims 6-10.

16. A non-transitory computer-readable storage medium containing a computer program which, when executed by one or more processors, causes the processors to perform the method of any one of claims 6-10.

17. A computer program product comprising a computer-readable storage medium having stored thereon instructions that, when executed, cause at least one central processor unit of a computing device to perform the method according to any one of claims 6-10.