Display device, display method and display panel

Abstract

The invention provides a display device, a display method and a display panel. The display device comprises the display panel and a processor. The display panel comprises a plurality of pixel units and a temperature sensor module; the temperature sensor module is arranged corresponding to a fingerprint detection area arranged on the display panel and is used for monitoring a first environment temperature of the fingerprint detection area; each pixel unit comprises a plurality of sub-pixels; and the processor is used for querying a preset brightness compensation table based on the first environment temperature to obtain a target brightness compensation coefficient corresponding to the sub-pixel in the compensation temperature interval corresponding to the first environment temperature so as to perform gamma compensation on each sub-pixel in the fingerprint detection area. The environment temperature of the fingerprint detection area is monitored in real time, and the brightness compensation coefficient is dynamically adjusted to perform gamma compensation on each sub-pixel in the fingerprint detection area, so that the problem of inconsistent brightness and chrominance of light spots caused by temperature change is solved, and the fingerprint identification accuracy and the user experience are improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display device, a display method, and a display panel. Background Art

[0002] Currently, most mobile electronic devices on the market (such as mobile phones and tablets) use light-sensing fingerprint unlocking technology, which requires high brightness and color consistency of the light spot in the fingerprint recognition area of ​​the screen. While existing technologies have been developed to improve the brightness consistency of the fingerprint recognition area under different background brightness conditions, these solutions fail to address the problem of inconsistent light spot brightness and color caused by ambient temperature fluctuations.

[0003] Due to the temperature characteristics of the light-emitting device materials in display panels, the brightness and chromaticity of the light-emitting devices vary significantly under different ambient temperatures, especially low temperatures. Specifically, at low temperatures, the brightness decreases and a color shift occurs, causing the light spot to appear reddish. This temperature-induced brightness and chromaticity change can cause the brightness and chromaticity of the light spot in the fingerprint recognition area to exceed the normal range required for fingerprint unlocking, resulting in longer fingerprint recognition response times or even failure, seriously affecting the user experience.

[0004] Therefore, how to effectively ensure the consistency of the brightness and color of the light spot in the fingerprint recognition area at different ambient temperatures is a problem that the field has consistently worked to solve. Summary of the Invention

[0005] The embodiments of the present application provide a display device, a display method, and a display panel to solve the technical problem of inconsistent brightness and chromaticity of light spots caused by changes in ambient temperature, and have the advantages of improving the consistency of brightness and chromaticity of light spots in the fingerprint recognition area and enhancing user experience.

[0006] An embodiment of the present application provides a display device, including:

[0007] a display panel comprising a plurality of pixel units and a temperature sensor module; the temperature sensor module being disposed corresponding to a fingerprint detection area disposed on the display panel and configured to monitor a first ambient temperature of the fingerprint detection area; each pixel unit comprising a plurality of sub-pixels, each of the sub-pixels comprising a light-emitting device and a pixel circuit;

[0008] A processor, connected to the display panel, is configured to query a preset brightness compensation table based on the first ambient temperature to obtain a target brightness compensation coefficient corresponding to the sub-pixel within a compensation temperature range corresponding to the first ambient temperature, so as to perform gamma compensation on each sub-pixel located in the fingerprint detection area; the brightness compensation table includes brightness compensation coefficients corresponding to different compensation temperature ranges.

[0009] The present application also provides a display method, which is applied to the display device described above. The method includes:

[0010] Based on the first ambient temperature of the fingerprint detection area monitored by the temperature sensor module, a preset brightness compensation table is queried to obtain a target brightness compensation coefficient corresponding to the sub-pixel in the compensation temperature range corresponding to the first ambient temperature, so as to perform gamma compensation on each sub-pixel located in the fingerprint detection area; the brightness compensation table includes brightness compensation coefficients corresponding to different compensation temperature ranges.

[0011] An embodiment of the present application also provides a display panel, comprising a plurality of pixel units and a temperature sensor module; the temperature sensor module is arranged corresponding to a fingerprint detection area set on the display panel, and is used to monitor a first ambient temperature of the fingerprint detection area; each of the pixel units includes a plurality of sub-pixels, and the sub-pixels include a light-emitting device and a pixel circuit; a preset brightness compensation table is queried based on the first ambient temperature to obtain a target brightness compensation coefficient corresponding to the sub-pixel in a compensation temperature range corresponding to the first ambient temperature, so as to perform gamma compensation on each sub-pixel located in the fingerprint detection area; the brightness compensation table includes brightness compensation coefficients corresponding to different compensation temperature ranges.

[0012] In summary, the display device, display method, and display panel provided by this application address the issue of inconsistent brightness and chromaticity of the light spot within the fingerprint detection area due to temperature variations by monitoring the ambient temperature of the fingerprint detection area in real time and dynamically adjusting the brightness compensation coefficient to perform gamma compensation on each sub-pixel within the fingerprint detection area. This approach improves fingerprint recognition accuracy and user experience. Specifically, a temperature sensor module accurately monitors the first ambient temperature of the fingerprint detection area. Based on this temperature, a processor queries a preset brightness compensation table to obtain the target brightness compensation coefficients for the sub-pixels within the corresponding compensation temperature range, and then performs gamma compensation on each sub-pixel within the fingerprint detection area. This effectively addresses the prior art issue of inconsistent brightness and chromaticity of the light spot within the fingerprint recognition area caused by reduced brightness and color shift of the display panel's light-emitting devices due to ambient temperature variations, particularly in low-temperature environments. This avoids extended fingerprint recognition response time or recognition failures caused by brightness and chromaticity variations outside the normal range, significantly improving the stability and success rate of fingerprint recognition, and significantly enhancing the user experience, providing users with a more reliable and convenient fingerprint unlocking service experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present application is further described below with reference to the accompanying drawings. It should be noted that the drawings described below are only used to illustrate some embodiments of the present application, and those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0014] Figure 1 A schematic diagram of a display device provided in an embodiment of the present application.

[0015] Figure 2 A schematic diagram of a display panel provided in an embodiment of the present application.

[0016] Figure 3 A schematic diagram of the temperature sensor module structure provided in an embodiment of the present application.

[0017] Figure 4 This is another schematic diagram of a display device provided in an embodiment of the present application.

[0018] Figure 5 Schematic diagram of an application scenario of the display device provided in an embodiment of the present application.

[0019] Figure 6 Schematic diagram of the light spot chromaticity horizontal coordinate coefficient before and after adjustment in the embodiment of the present application.

[0020] Figure 7 Schematic diagram of the light spot chromaticity ordinate coefficient before and after adjustment in the embodiment of the present application.

[0021] Figure 8 Schematic diagram of the light spot brightness coefficient before and after adjustment in the embodiment of the present application. DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0023] In the description of this application, the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are merely used to distinguish different technical features. The term "plurality" and similar words mean two or more, unless otherwise expressly limited. The embodiments of this application may be combined with each other.

[0024] The present application provides a display device, which includes but is not limited to the following embodiments and combinations of the following embodiments.

[0025] In some embodiments, combined Figure 1 and Figure 2 As shown, Figure 1 A schematic diagram of a display device provided in an embodiment of the present application; Figure 2Schematic diagram of a display panel provided in an embodiment of the present application; the display panel provided in an embodiment of the present application may be, for example, an organic light emitting diode (OLED) display panel. Of course, the display panel may also be a Mini-LED display panel or a Micro-LED display panel. The display panel may include a source driver circuit, a gate driver circuit, a timing controller, a light controller, a power management chip, a substrate, a data line for transmitting a data signal DATA, a scan line for transmitting a scan signal SCAN, a power line for transmitting a voltage VDD at the positive end of the power line or a voltage VSS at the negative end of the power line, a light control signal line for transmitting a light control signal EM, a pixel array, an encapsulation layer, a polarizer, a color filter, etc.

[0026] The substrate may be, for example, a glass substrate, a flexible substrate (e.g., a polyimide substrate), etc. The pixel array is composed of a plurality of pixel units arranged in rows and columns, forming a plurality of pixel rows arranged along the row direction and a plurality of pixel columns arranged along the column direction, each pixel row and each pixel column includes a plurality of pixel units, each pixel unit includes a plurality of sub-pixels, and the sub-pixels include light-emitting devices and pixel circuits. For ease of description, pixel rows and pixel columns may also be referred to as "rows" and "columns" hereinafter. Taking the display panel as an OLED display panel as an example, the pixel unit may include an organic light-emitting device and a pixel driving circuit. The pixel driving circuit may include a driving transistor, which is used to control the brightness of the corresponding organic light-emitting device in the display panel. In an actual pixel unit, the driving transistor may include but is not limited to a thin film transistor (TFT) of low temperature polycrystalline silicon (LTPS) and a metal oxide semiconductor. The TFT may adopt a dual-gate structure, and the organic light-emitting device is electrically connected to the first electrode or the second electrode of the TFT. Organic light-emitting devices may include a light-emitting layer, an electron transport layer, a hole transport layer, a cathode and an anode, etc. Different organic materials can emit light of different wavelengths to achieve full-color display. The encapsulation layer includes an organic / inorganic alternating multi-layer structure. The gate driver circuit (GOA, Gate driver On Array) is mainly used to scan and drive the pixel rows. For example, the GOA circuit may include cascaded gate driver units, wherein each level of gate driver unit corresponds to controlling one or more pixel rows to achieve the gating of the pixel units. In some embodiments, the GOA may adopt unilateral drive or bilateral drive for multiple pixel rows, wherein the unilateral drive may be to arrange the gate driver unit only on one side (such as the left or right side), and drive the multiple pixel rows by scanning row by row in a cascade manner. Bilateral drive may be to arrange the driver units on both the left and right sides of the multiple pixel rows, and drive the multiple pixel rows by scanning row by row through the cooperation of both sides. The source driver circuit is used to provide data signals to the pixel units. The timing controller is used to receive external input image data and synchronization signals, and generate the signals required by the gate driver circuit and the source driver circuit. The power management chip is used to provide the required operating voltage for each part of the display panel. It should be noted that, Figure 2 This is an exemplary schematic diagram, and the connection relationship of the components shown is only used to explain the functional logical relationship of the display panel, rather than to limit the actual physical structure.

[0027] In one embodiment, Figure 1As shown, the display device 100 includes a display panel and a processor. The display panel includes multiple pixel units and a temperature sensor module 11. The temperature sensor module 11 is provided corresponding to a fingerprint detection area 12 provided on the display panel and is used to monitor a first ambient temperature of the fingerprint detection area 12. Each pixel unit includes multiple sub-pixels, each of which includes a light-emitting device and a pixel circuit.

[0028] The processor is connected to the display panel and is used to query a preset brightness compensation table based on the first ambient temperature to obtain a target brightness compensation coefficient corresponding to the sub-pixel in the compensation temperature range corresponding to the first ambient temperature, so as to perform gamma compensation on each sub-pixel located in the fingerprint detection area; the brightness compensation table includes brightness compensation coefficients corresponding to different compensation temperature ranges.

[0029] The processor can be determined based on actual circumstances, and this is not limited here. As an example, the processor can be an application processor (AP). The fingerprint detection area 12 can be the area corresponding to the fingerprint hole provided in the display panel. The fingerprint hole can be understood as the through-hole area of ​​the flexible printed circuit board (FPC). A temperature sensor module is added to the through-hole area of ​​the FPC to sense the ambient temperature. The through-hole area is located on the back of the display panel. The fingerprint detection area can be set based on the light spot range or an area equivalent to the light spot range. The light spot can refer to the array of light spots formed by micro-light-emitting units (such as OLED pixels or independent light sources) in the fingerprint detection area under the display panel. When a finger presses the screen, the light spot can emit light of a specific wavelength, which penetrates the screen glass cover and illuminates the fingerprint, thereby achieving fingerprint detection. By way of example only, the fingerprint detection area referred to in this embodiment can be the light spot area corresponding to the light spot or the area corresponding to the light spot range. The specific determination can be based on actual circumstances.

[0030] The temperature sensor module can be a temperature-sensing component integrated into the display panel. Specifically, it can be implemented using a combination of a thermistor and an analog-to-digital conversion circuit, where changes in resistance reflect the ambient temperature. A pixel unit can be the smallest light-emitting unit of a display panel. Specifically, it can be composed of red, green, and blue sub-pixels, each of which contains an independently driven light-emitting device and pixel circuit. A brightness compensation table can be a data set that stores the mapping relationship between temperature and compensation coefficients. Specifically, it can be established by experimentally testing the brightness deviation of each sub-pixel at different temperatures. Gamma compensation can be a driving method that performs nonlinear correction on the input signal. Specifically, it can be achieved by adjusting the parameters of the voltage-brightness curve.

[0031] Specifically, the temperature sensor module collects temperature data from the fingerprint detection area in real time, and the processor maps the temperature values ​​to preset compensation intervals. For example, when the temperature range of -20°C to 0°C is detected, the corresponding red sub-pixel compensation coefficients R1, G1, and B1 are used. When the temperature range of -10°C to 0°C is detected, the corresponding red sub-pixel compensation coefficients R2, G2, and B2 are used. When the temperature range of 0°C to 10°C is detected, the corresponding red sub-pixel compensation coefficients R3, G3, and B3 are used. When the temperature range of 10°C to 20°C is detected, the corresponding red sub-pixel compensation coefficients R4, G4, and B4 are used. The compensation coefficients are applied to the gamma voltage of each sub-pixel, compensating for luminous brightness attenuation by changing the amplitude of the drive signal. Because red attenuation is significant at low temperatures, the compensation coefficients for the red sub-pixels are set larger to eliminate color shift. This application introduces a temperature perception and dynamic compensation mechanism to establish differentiated compensation strategies for different color sub-pixels. For example, considering that the lack of compensation for red sub-pixels at low temperatures will cause the light spot to turn red, this application effectively maintains the balance of the brightness of the three primary colors by dividing the temperature intervals and setting independent coefficients. In this way, this application solves the problems of brightness attenuation and color shift of fingerprint light spots in low temperature environments, and stabilizes the brightness and color of the light spot within the working range of the fingerprint recognition module. Through temperature-adaptive gamma compensation, the consistency of the light spot color is ensured at different ambient temperatures, avoiding unlocking failures caused by color shift, and improving the user experience in low temperature scenarios.

[0032] In one embodiment, Figure 3 This is a schematic diagram of the temperature sensor module structure provided in an embodiment of the present application. Figure 3 As shown, the temperature sensor module 11 includes a first resistor R1, a second resistor R2, a capacitor C1 and an analog-to-digital converter; the first end of the first resistor R1 is used to access the input current control signal VCC, and the second end of the first resistor R1 is connected to the first end of the second resistor R2; the first end of the second resistor R2 is connected to the ground; the first end of the capacitor C1 is connected to the first end of the second resistor R2, and the second end of the capacitor C1 is connected to the second end of the second resistor R2; the second end of the first resistor R1 is connected to the first end of the analog-to-digital converter; the second end of the analog-to-digital converter is connected to the processor; wherein, the resistance value of the second resistor R2 changes with the ambient temperature corresponding to the fingerprint detection area.

[0033] The analog-to-digital converter is used to obtain the resistance value of the second resistor R2, determine the first ambient temperature according to the resistance value of the second resistor R2, and transmit the first ambient temperature to the processor.

[0034] The second resistor R2 can be a resistor device whose resistance changes with temperature, and can be implemented specifically by a thermistor or a metal film resistor. Its resistance change is linearly or nonlinearly related to temperature, and the temperature change is converted into a voltage signal through a voltage divider circuit.

[0035] An analog-to-digital converter (ADC) can be an integrated circuit that converts an analog voltage signal into a digital signal. Specifically, it can be implemented using a successive approximation converter or an integral converter, and the corresponding temperature value is calculated by quantizing the voltage value.

[0036] The capacitor C1 can be an energy storage element used for filtering, and can be specifically implemented by a ceramic capacitor or an electrolytic capacitor, which eliminates high-frequency noise interference in the circuit through the charging and discharging process.

[0037] Specifically, the input current control signal VCC flows through the first resistor R1 and the second resistor R2 to form a voltage divider circuit. The resistance of the second resistor R2 changes with the ambient temperature, causing the voltage at the voltage divider point to change. The capacitor filters the voltage at the voltage divider point and inputs it into the analog-to-digital converter. The analog-to-digital converter converts the voltage signal into a digital signal, and calculates the current ambient temperature value based on the pre-stored resistance-temperature correspondence, and finally transmits the temperature data to the processor. In other words, the resistor R1 and the thermistor R2 form a series voltage divider circuit, and the resistance ratio is equal to the voltage ratio. By looking up the resistance value of the thermistor corresponding to the temperature, the current ambient temperature value is obtained, and the temperature data is transmitted to the processor. This realizes the integration of the temperature detection function with the display panel, avoiding the external temperature sensor from occupying additional space.

[0038] This application embeds the temperature detection function into the display driver circuit by reusing the resistor network and signal processing unit on the display panel, reducing the number of components and circuit complexity. This allows real-time monitoring of temperature changes in the fingerprint detection area and converts the temperature signal into a processable electrical signal through the principle of resistor voltage division, providing accurate ambient temperature data for subsequent brightness compensation, thereby solving the problem of spot brightness and chromaticity deviation caused by color shift of the light-emitting device in low-temperature environments.

[0039] In one embodiment, different compensation temperature intervals are divided according to the material properties of the display panel and the light-emitting properties of the light-emitting device.

[0040] Among them, the material properties of the screen body can be physical properties such as thermal expansion coefficient and transmittance change of the material constituting the display panel substrate or packaging layer when the temperature changes. Specifically, it can be achieved by using glass, polyimide or flexible polymer materials. These materials may deform or their optical properties may fluctuate at different temperatures, affecting the brightness and color consistency of the light spot in the display area.

[0041] The luminous characteristics of a light-emitting device can be expressed by the current-brightness response curve, luminous efficiency attenuation trend, and wavelength shift degree of the light-emitting device at different temperatures. Specifically, it can be achieved by using organic light-emitting diodes or quantum dot light-emitting devices. Such devices may experience brightness reduction or color coordinate shift in low-temperature environments, causing the light spot color to deviate from the target range.

[0042] Specifically, differences in the thermal expansion coefficients of screen materials can cause slight deformations in the spacing between pixel units when the temperature changes, thereby affecting the focusing effect of the light spot; and the luminous efficiency of the light-emitting device exhibits nonlinear decay as the temperature decreases, with different color sub-pixels having different attenuation slopes. By experimentally measuring the deformation and transmittance change data of the screen material at different temperatures, combined with the brightness output curve and color coordinate offset of the light-emitting device at the corresponding temperature, the temperature range can be divided into multiple intervals with similar material deformation characteristics and luminous attenuation laws. For example, in the range of -20°C to -10°C, the shrinkage rate of the screen material and the efficiency decay rate of the light-emitting device both show steep changes, so this interval is separately divided into a compensation temperature interval and matched with the corresponding brightness compensation coefficient.

[0043] As an example, different compensation temperature ranges can be divided into multiple compensation temperature ranges such as -20~-10℃, -10~0℃, 0~10℃, 10~20℃, and 20~30℃ according to the material properties of the display panel and the luminous properties of the light-emitting device.

[0044] This application establishes a multi-dimensional temperature interval division model by integrating the temperature response patterns of material properties and luminescence characteristics. This allows the compensation parameters to better align with actual physical change trends, thereby improving the ability to control the consistency of light spot brightness and chromaticity. In this way, the boundaries of the compensation temperature intervals can be dynamically adjusted to address the combined effects of screen material deformation and light-emitting device color shift at different temperatures, ensuring that the compensation coefficients within each interval accurately match the temperature response characteristics of the material and device. This solves the problem of reddening and insufficient brightness in the fingerprint detection area in low-temperature environments, and improves the success rate and response speed of fingerprint unlocking.

[0045] In one embodiment, the multiple sub-pixels in each pixel unit include red sub-pixels, green sub-pixels and blue sub-pixels, and the red sub-pixels, green sub-pixels and blue sub-pixels respectively include corresponding light-emitting devices and pixel circuits; wherein, the compensation temperature intervals corresponding to sub-pixels of different colors can be divided differently.

[0046] For example, in one embodiment, the red sub-pixel may be a sub-pixel unit using a red light emitting material, specifically, it may be implemented using aluminum indium gallium phosphide material, and its light emitting wavelength range is, for example, 620-750 nanometers. The green sub-pixel may be a sub-pixel unit using a green light emitting material, specifically, it may be implemented using gallium nitride material, and its light emitting wavelength range is, for example, 495-570 nanometers. The blue sub-pixel may be a sub-pixel unit using a blue light emitting material, specifically, it may be implemented using indium gallium nitride material, and its light emitting wavelength range is, for example, 450-495 nanometers. Different ways of dividing the compensation temperature interval can be to divide the temperature range into different interval segments according to the differences in the temperature characteristics of the light emitting materials of sub-pixels of different colors.

[0047] Specifically, in the fingerprint detection area of ​​the display panel, the temperature sensor module monitors the ambient temperature in real time and transmits it to the processor. The processor matches the corresponding compensation temperature intervals for the red, green, and blue sub-pixels according to the pre-established brightness compensation table. Due to differences in the temperature drift characteristics of different luminescent materials, for example, the brightness attenuation of red luminescent materials at low temperatures may be greater than that of blue materials, so it is necessary to set independent temperature interval division standards for each color sub-pixel. When it is detected that the current temperature is in a specific compensation interval corresponding to a certain sub-pixel, the processor calls the gamma compensation coefficient corresponding to the interval to perform brightness compensation on the corresponding color sub-pixel in the fingerprint detection area, thereby eliminating the chromaticity deviation caused by temperature changes.

[0048] By establishing a color-separated temperature compensation mechanism, this application can more accurately match the actual temperature response characteristics of each color sub-pixel. For example, in low-temperature environments, a higher frequency compensation interval is implemented for the red sub-pixel, thereby specifically suppressing the reddening of the light spot. This effectively solves the problem of fingerprint light spot color shift caused by the difference in brightness attenuation of different color sub-pixels in low-temperature environments, ensuring that the light spot chromaticity in the fingerprint detection area is always within the preset range, significantly improving the success rate of fingerprint recognition in low-temperature environments.

[0049] In one embodiment, the processor is further configured to:

[0050] Obtain the actual light spot brightness and chromaticity corresponding to the fingerprint detection area at different ambient temperatures, and determine the deviation parameters between the actual light spot brightness and chromaticity and the target light spot brightness and chromaticity;

[0051] Iteratively optimizing the gamma compensation coefficient of each sub-pixel within the fingerprint detection area according to the deviation parameter until the value of the deviation parameter reaches a target threshold, and determining the optimized gamma compensation coefficient of each sub-pixel as the corresponding target brightness compensation coefficient;

[0052] Determine a brightness compensation coefficient corresponding to each compensation temperature interval based on each ambient temperature and the corresponding target brightness compensation coefficient;

[0053] A brightness compensation table is established according to each compensation temperature range and the corresponding brightness compensation coefficient.

[0054] Among them, the deviation parameter can be an indicator of the difference between the actual measurement value and the target value. Specifically, it can be implemented by weighted calculation of the brightness difference value and the chromaticity coordinate offset, and is used to quantify the degree of deviation of the brightness and chromaticity of the light spot. Iterative optimization can be a cyclic process of adjusting the compensation coefficient multiple times and re-evaluating the deviation parameter. Specifically, it can be implemented by a gradient descent algorithm or a genetic algorithm to gradually approach the optimal compensation parameter. The target threshold can be the maximum error range allowed by the deviation parameter. Specifically, it can be set to the boundary value of the allowable fluctuation range of the brightness and chromaticity of the light spot, and is used to determine whether the compensation coefficient meets the accuracy requirements. The compensation temperature range can be to divide the continuous temperature range into multiple discrete segments. Specifically, it can be divided according to intervals of every 5°C or every 10°C to establish a mapping relationship between temperature and compensation coefficient.

[0055] Specifically, the processor first collects brightness and chromaticity data from the fingerprint detection area at multiple preset temperature points and calculates the deviation parameters from the preset target values. It then adjusts the gamma compensation coefficients of the red, green, and blue sub-pixels, remeasures the brightness and chromaticity of the light spot, and calculates the updated deviation parameters. This process is repeated, with each iteration adjusting the compensation coefficient based on the direction of the deviation change until the deviation parameter is reduced to the target threshold range. Finally, the optimized compensation coefficient is associated with the corresponding temperature, and a brightness compensation table is generated according to the temperature range division rules.

[0056] As just an example, the brightness compensation table can be understood with reference to the following Table 1, which is a schematic brightness compensation table.

[0057] Table 1

[0058]

[0059]

[0060] By establishing a mapping relationship between temperature ranges and dynamically optimized compensation coefficients, this application can automatically match the optimal compensation parameters for different temperatures, solving the problem of brightness and chromaticity misalignment caused by color deviation of light-emitting devices in low-temperature environments. This achieves accurate compensation of the brightness and chromaticity of the light spot in the fingerprint detection area under different ambient temperatures, effectively eliminating the brightness attenuation and chromaticity shift caused by temperature changes, ensuring the operational stability of the fingerprint recognition module in different usage scenarios, and improving the unlocking success rate and user experience.

[0061] In one embodiment, the brightness compensation coefficient includes a first brightness compensation coefficient, a second brightness compensation coefficient, and a third brightness compensation coefficient; the first brightness compensation coefficient represents the gamma value compensation coefficient corresponding to the red sub-pixel; the second brightness compensation coefficient represents the gamma value compensation coefficient corresponding to the green sub-pixel; the third brightness compensation coefficient represents the gamma value compensation coefficient corresponding to the blue sub-pixel; each compensation temperature interval corresponds to a first brightness compensation coefficient, a second brightness compensation coefficient, and a third brightness compensation coefficient.

[0062] Specifically, after the temperature sensor module detects the ambient temperature of the fingerprint detection area, the processor matches the corresponding compensation temperature interval based on the temperature value and extracts the independent compensation coefficients for the red, green, and blue sub-pixels from the brightness compensation table. For example, when the ambient temperature is in the range of -20°C to -10°C, the first brightness compensation coefficient of the red sub-pixel can be set to 1.147 times the reference value, the second brightness compensation coefficient of the green sub-pixel is set to 1.151 times the reference value, and the third brightness compensation coefficient of the blue sub-pixel is set to 1.149 times the reference value. By independently storing and calling the compensation coefficients of the three sub-pixels, it is possible to accurately compensate for the temperature characteristics differences of light-emitting devices of different colors, avoiding the color coordinate offset problem caused by unified compensation in traditional solutions.

[0063] This application establishes a three-channel independent compensation mechanism to match the compensation amount of each sub-pixel with its actual temperature response characteristics, effectively solving the problem of insufficient or over-compensation of monochromatic components in composite white light. In this way, the brightness compensation ratio of red, green, and blue sub-pixels when the temperature changes can be accurately controlled to eliminate the color deviation of mixed light spots caused by differences in material temperature characteristics. In a low-temperature environment, the red sub-pixel obtains a higher-intensity driving signal through an independent compensation coefficient to compensate for the rapid attenuation of its luminous efficiency; the blue sub-pixel adjusts the driving timing through a specific compensation coefficient to suppress the color coordinate offset. This ensures that the light spot in the fingerprint detection area maintains stable brightness and standard chromaticity within the temperature range of -20°C to 30°C, so that the signal-to-noise ratio of the optical fingerprint sensor is always kept above the recognition threshold.

[0064] In one embodiment, Figure 4 Another schematic diagram of a display device provided in an embodiment of the present application; Figure 4 As shown; the display device also includes a memory; the memory is connected to the processor;

[0065] A memory is used to store the brightness compensation table.

[0066] The processor is further configured to determine a target compensation temperature interval in which the first ambient temperature is located based on the brightness compensation table, and determine a target brightness compensation coefficient corresponding to the first ambient temperature from the brightness compensation table based on the target compensation temperature interval.

[0067] The memory may be a hardware module with data storage capabilities, specifically implemented as a flash memory chip or embedded storage unit, and is used to persistently store pre-established brightness compensation table data, preventing the processor from recalculating compensation parameters each time the temperature changes. The memory can be determined based on actual circumstances and is not limited herein. As an example, the memory may be flash memory or non-volatile memory, used to store data and programs, ensuring that the information is not lost even after the device loses power.

[0068] The brightness compensation table can be a data structure containing the mapping relationship between temperature intervals and brightness compensation coefficients. It can be implemented in the form of a two-dimensional array or a hash table. Each temperature interval corresponds to a set of compensation coefficients for red, green, and blue sub-pixels, so that the processor can quickly match the compensation value corresponding to the current temperature by looking up the table.

[0069] The target compensation temperature range can be a temperature range divided according to the material characteristics of the display panel, and can be defined in the form of a closed interval or an open interval, such as -20℃ to -10℃, -10℃ to 0℃, 0℃ to 10℃, 10℃ to 20℃, 20℃ to 30℃, etc. The interval division can reduce the interference of temperature fluctuations on the selection of the compensation coefficient.

[0070] Specifically, the memory and the processor form a data access link. When the temperature sensor module detects the real-time temperature of the fingerprint detection area, the processor compares the temperature value with the temperature interval preset in the brightness compensation table to determine the range of the temperature, and then extracts the red, green, and blue sub-pixel brightness compensation coefficients corresponding to the interval. For example, when the detected temperature is -8°C, the processor matches the -10°C to 0°C interval and calls the red compensation coefficient R, green compensation coefficient G, and blue compensation coefficient B stored in the interval to adjust the gamma value of the three-color sub-pixels respectively. The data pre-storage capability of the memory avoids the processing delay caused by the real-time calculation of the compensation coefficient, while ensuring that the brightness and color of the light spot meet the fingerprint recognition requirements in a low-temperature environment.

[0071] This application uses a pre-stored compensation parameter table for each temperature range, combined with temperature detection and a table lookup mechanism, to achieve automatic adaptation of the compensation coefficient, significantly reducing the deviation in light spot brightness and chromaticity caused by temperature changes. This allows for rapid call-up of the corresponding brightness compensation coefficient based on the real-time temperature, effectively suppressing the brightness attenuation and color shift caused by low temperatures. This ensures that the light spot brightness and chromaticity in the fingerprint detection area remain stable at different temperatures, thereby improving the success rate and response speed of fingerprint unlocking.

[0072] In one embodiment, Figure 4As shown; the display device also includes a display interface controller (DIC, DisplayInterface Controller); the display interface controller is connected to the processor and the display panel respectively.

[0073] The processor is further configured to write the target brightness compensation coefficient into the display interface controller.

[0074] The display interface controller is configured to: store reference gamma values ​​corresponding to the red sub-pixels, the green sub-pixels, and the blue sub-pixels in the fingerprint detection area at a second ambient temperature; and determine compensated target gamma values ​​corresponding to the red sub-pixels, the green sub-pixels, and the blue sub-pixels based on a target brightness compensation coefficient and the corresponding reference gamma value, so as to drive the display panel for display.

[0075] The display interface controller is a module used to convert and control display data formats. It can be implemented as an integrated circuit chip, such as one integrated into the display driver circuit. Its function is to convert processed gamma compensation parameters into drive signals, ensuring that brightness adjustment instructions are accurately transmitted to the display panel.

[0076] The reference gamma value can be a pre-calibrated sub-pixel brightness reference parameter at a specific ambient temperature, which can be obtained through laboratory testing. Its role is to provide a reference for brightness compensation at different temperatures, making the compensation process traceable.

[0077] The target gamma value can be the sub-pixel drive parameter adjusted by the brightness compensation coefficient, which can be achieved through multiplication or table lookup. Its function is to dynamically correct the brightness deviation caused by temperature changes, so that the brightness and color of the light spot output by the display panel remain stable.

[0078] Specifically, the display interface controller stores the reference gamma values ​​of the red, green, and blue sub-pixels at the second ambient temperature, which reference values ​​generally correspond to the calibration data under normal temperature conditions. After the processor determines the target brightness compensation coefficient based on the currently detected first ambient temperature, the coefficient is written to the display interface controller. The display interface controller calculates the target brightness compensation coefficient and the reference gamma value, such as multiplying the two or fusing them through a preset algorithm to generate a compensated target gamma value. The target gamma value is then converted into a driving voltage signal and applied to the pixel circuits of the red, green, and blue sub-pixels, respectively, to adjust the luminous brightness of each sub-pixel. In this way, even when the temperature change causes the characteristics of the light-emitting device to shift, the brightness and chromaticity of the light spot output by the display panel can still be maintained within the range required for fingerprint unlocking.

[0079] This application uses a color-separation compensation mechanism to store and independently adjust the reference gamma value for each color sub-pixel, thereby simultaneously correcting brightness attenuation and color coordinate offset. Furthermore, the collaborative work of the display interface controller and the processor enables real-time updates of the compensation parameters, avoiding the drawback of traditional fixed compensation tables that are unable to adapt to dynamic temperature changes. This effectively addresses the issues of reduced brightness and color shift in the fingerprint detection area under low-temperature conditions, suppressing the excessive light emission of the red sub-pixel and compensating for the brightness attenuation of the green and blue sub-pixels, thereby maintaining an overall balance in the brightness and color of the light spot. This ensures that the light spot parameters required for fingerprint unlocking are always within the acceptable range of the recognition algorithm under different ambient temperatures, significantly reducing the unlocking failure rate and improving the user experience.

[0080] As an example, Figure 5 Schematic diagram of the application scenario of the display device provided in the embodiment of the present application. The fingerprint detection area can be the area corresponding to the fingerprint hole opened in the display panel. The fingerprint hole can be understood as the FPC hole area. By adding a temperature sensor module to the FPC hole area to sense the ambient temperature, the hole area is on the back of the display panel to achieve coefficient compensation of the gamma values ​​of the red, green and blue sub-pixels of the light spot in different temperature ranges, so that the brightness and chromaticity of the fingerprint hole light spot can meet the unlocking threshold requirements at different ambient temperatures, thereby significantly improving the fingerprint recognition speed and success rate. Specifically, under normal temperature conditions (taking 25°C as an example), the reference gamma values ​​of the red, green and blue sub-pixels in the light spot area of ​​the screen panel are selected. Then, by changing the ambient temperature, the screen temperature is adjusted, and the deviation of the actual light spot brightness (Lv) and chromaticity (X, Y) from the target value is measured. The chromaticity (X, Y) can be understood as CIE color coordinates. The horizontal coordinate of the CIE color can be recorded as CIE X, and the vertical coordinate of the CIE color can be recorded as CIEY. Figure 6 、 Figure 7 、 Figure 8 To understand, Figure 6 Schematic diagram of the light spot chromaticity abscissa coefficient before and after adjustment in the embodiment of the present application; Figure 7 Schematic diagram of the light spot chromaticity ordinate coefficient before and after adjustment in the embodiment of the present application; Figure 8 Schematic diagram of the spot brightness coefficient before and after adjustment in the embodiment of this application. Figure 6 In the chart, the black line represents CIEX before coefficient adjustment; the gray line represents CIEX after coefficient adjustment. Figure 7 In the figure, the black line represents CIEY before coefficient adjustment; the gray line represents CIEY after coefficient adjustment. Figure 8 In the figure, the black line represents the Lv before coefficient adjustment; the gray line represents the Lv after coefficient adjustment. The gamma compensation coefficients of the R / G / B sub-pixels are optimized iteratively until the brightness and chromaticity of the light spot reach the target threshold. Figure 6 、 Figure 7、 Figure 8 The medium gray line is drawn, and the compensation coefficient corresponding to each temperature range is recorded. The gamma compensation coefficients corresponding to different temperature ranges are formed into a data set, which serves as the data set for the light spot gamma target brightness compensation coefficients for each temperature range in the display temperature range group. This data set is stored in flash memory. The temperature sensor monitors the screen temperature in real time, and the AP calls the gamma compensation coefficient for the corresponding temperature range. The compensation coefficient is multiplied by the reference gamma value, and the register parameters are updated to dynamically adjust the light spot brightness and color.

[0081] In order to better illustrate the above-mentioned display device, the present application further provides a display method, which is applied to the above-mentioned display device, and the method includes:

[0082] Based on the first ambient temperature of the fingerprint detection area monitored by the temperature sensor module, a preset brightness compensation table is queried to obtain the target brightness compensation coefficient corresponding to the sub-pixel in the compensation temperature range corresponding to the first ambient temperature, so as to perform gamma compensation on each sub-pixel located in the fingerprint detection area; the brightness compensation table includes brightness compensation coefficients corresponding to different compensation temperature ranges.

[0083] Among them, the temperature sensor module can be a component used to collect the ambient temperature of the fingerprint detection area in real time. Specifically, it can be implemented by using a thermistor combined with an analog-to-digital conversion circuit, and the temperature difference is reflected by the change in the resistance value. The brightness compensation table can be a data set of pre-established mapping relationships between temperature intervals and compensation coefficients. Specifically, it can be implemented by experimentally calibrating the brightness deviation of sub-pixels at different temperatures and fitting the compensation parameters, which is used to quickly match the compensation strategy corresponding to the current temperature. The compensation temperature interval can be a classification method that divides the continuous temperature range into multiple discrete segments. Specifically, it can be divided non-uniformly according to the material characteristics of the light-emitting device and the trend of color change. For example, more dense intervals are set in the low temperature segment to improve compensation accuracy. Gamma compensation can be an operation to correct the display brightness by adjusting the relationship between the driving voltage and the brightness response curve. Specifically, it can be implemented by dynamically modifying the gamma register parameters using a lookup table method or interpolation method to offset the brightness attenuation and color shift caused by temperature.

[0084] Specifically, when the temperature of the fingerprint detection area changes, the temperature sensor module collects the current ambient temperature data in real time. The processor matches the temperature value with the preset brightness compensation table to determine the compensation temperature range. According to the brightness compensation coefficient corresponding to the range, the gamma values ​​of the red, green, and blue sub-pixels are dynamically adjusted. For example, when the temperature is detected to be in the range of -10°C to 0°C, the blue sub-pixel compensation coefficient corresponding to the range is called to compensate for the blue light brightness attenuation and color coordinate shift caused by low temperature by increasing the slope of the gamma curve of the blue sub-pixel driving voltage.

[0085] In some embodiments, the temperature sensor module can be integrated into the display panel's border area and connected to the processor via metal traces. A brightness compensation table can be stored in the device's non-volatile memory, with the starting values ​​for each interval and the corresponding compensation coefficients for the three primary colors arranged in ascending order by temperature. Gamma compensation can be performed during each frame refresh, with the compensated gamma parameters written to the driver chip via the display interface controller.

[0086] By establishing a temperature-compensation coefficient mapping relationship, this method achieves dual correction for both light spot brightness attenuation and color shift in low-temperature environments, resolving fingerprint recognition failures caused by material temperature characteristics. This effectively maintains brightness and color consistency in the fingerprint detection area under varying temperature conditions, preventing unlocking delays or failures caused by low temperatures. By dynamically adjusting the gamma compensation parameters of each sub-pixel, both brightness drop and color shift are simultaneously corrected, ensuring that the light spot characteristics remain within the fingerprint recognition module's operating threshold, improving unlocking success rates and user experience.

[0087] In one embodiment, the method further comprises:

[0088] Obtain the actual light spot brightness and chromaticity corresponding to the fingerprint detection area at different ambient temperatures, and determine the deviation parameters between the actual light spot brightness and chromaticity and the target light spot brightness and chromaticity;

[0089] Iteratively optimize the gamma compensation coefficient of each sub-pixel in the fingerprint detection area according to the deviation parameter until the value of the deviation parameter reaches the target threshold, and then determine the optimized gamma compensation coefficient of each sub-pixel as the corresponding target brightness compensation coefficient;

[0090] Determine a brightness compensation coefficient corresponding to each compensation temperature interval based on each ambient temperature and the corresponding target brightness compensation coefficient;

[0091] A brightness compensation table is established according to each compensation temperature range and the corresponding brightness compensation coefficient.

[0092] The deviation parameter can be the degree of difference between the brightness and colorimetric data of the actual light spot and the preset target value. Specifically, a colorimeter can be used to measure the color coordinates and brightness value of the actual light spot, and the deviation can be quantified by calculating the mean square error between the actual light spot and the target value to evaluate the effectiveness of the current compensation coefficient. Iterative optimization can be to adjust the gamma compensation coefficient multiple times through a gradient descent algorithm, and re-measure the deviation parameter after each adjustment until the parameter converges to within a preset threshold range to ensure that the compensated light spot meets the optical standard. The compensation temperature range can be a temperature range divided according to the thermal expansion coefficient of the display panel material and the temperature drift characteristics of the light-emitting device. For example, -20°C to 30°C can be divided into intervals of 10°C, and each interval corresponds to an independent compensation parameter combination.

[0093] Specifically, before the display device leaves the factory, a temperature control chamber is used to simulate different ambient temperatures, and optical measurement equipment is used to collect the brightness and chromaticity data of the light spot in the fingerprint detection area. When the color coordinate offset of the actual light spot is detected to exceed 0.01 or the brightness fluctuation exceeds 10%, the processor automatically adjusts the gamma voltage compensation value of the red, green, and blue sub-pixels. After multiple iterations, the optimized compensation coefficient is obtained to reduce the deviation parameter to less than 0.01. Ultimately, the optimization results of different temperature ranges are integrated into a brightness compensation table. During device operation, this table automatically calls the corresponding compensation parameters by querying the current ambient temperature, achieving temperature-adaptive light spot correction.

[0094] By establishing a mapping relationship between temperature and compensation coefficients, this application can simultaneously eliminate brightness attenuation and color coordinate shift, solving the problem of fingerprint recognition failure caused by reddish light spots and insufficient brightness in low-temperature environments. In this way, the consistency of the brightness and color of the light spot in the fingerprint detection area is maintained at different ambient temperatures, effectively avoiding fingerprint recognition timeouts or failures caused by temperature changes, and ensuring that the display device can output a light spot pattern that meets optical standards within the range of -20°C to 30°C.

[0095] The details of the display method can be found in the above embodiments and will not be repeated here.

[0096] The present application also provides a display panel that can be combined with Figure 1 It is understood that the display panel includes multiple pixel units and a temperature sensor module 11; the temperature sensor module 11 is set corresponding to the fingerprint detection area 12 set on the display panel, and is used to monitor the first ambient temperature of the fingerprint detection area 12; each pixel unit includes multiple sub-pixels, and the sub-pixels include light-emitting devices and pixel circuits; based on the first ambient temperature, a preset brightness compensation table is queried to obtain the target brightness compensation coefficient corresponding to the sub-pixel in the compensation temperature range corresponding to the first ambient temperature, so as to perform gamma compensation on each sub-pixel located in the fingerprint detection area; the brightness compensation table includes brightness compensation coefficients corresponding to different compensation temperature ranges.

[0097] Among them, the fingerprint detection area 12 can be the area corresponding to the fingerprint hole opened in the display panel. The fingerprint hole can be understood as the hole area of ​​the flexible printed circuit board (FPC hole area). By adding a temperature sensor module in the FPC hole area to sense the ambient temperature, the hole area is on the back of the display panel. The fingerprint detection area can be set according to the light spot range, or it can be an area equivalent to the light spot range. Among them, the light spot can refer to the array of light spots formed by micro-light-emitting units (such as OLED pixels or independent light sources) in the fingerprint detection area under the display panel screen. When the finger presses the screen, the light spot can emit light of a specific wavelength, penetrate the screen glass cover and illuminate the fingerprint, thereby realizing fingerprint detection. As an example only, the fingerprint detection area mentioned in this embodiment can be the light spot area corresponding to the light spot or the area corresponding to the light spot range, which can be determined according to actual conditions.

[0098] The temperature sensor module can be a temperature-sensing component integrated into the display panel. Specifically, it can be implemented using a combination of a thermistor and an analog-to-digital conversion circuit, where changes in resistance reflect the ambient temperature. A pixel unit can be the smallest light-emitting unit of a display panel. Specifically, it can be composed of red, green, and blue sub-pixels, each of which contains an independently driven light-emitting device and pixel circuit. A brightness compensation table can be a data set that stores the mapping relationship between temperature and compensation coefficients. Specifically, it can be established by experimentally testing the brightness deviation of each sub-pixel at different temperatures. Gamma compensation can be a driving method that performs nonlinear correction on the input signal. Specifically, it can be achieved by adjusting the parameters of the voltage-brightness curve.

[0099] Specifically, the temperature sensor module collects temperature data from the fingerprint detection area in real time, and the processor maps the temperature values ​​to preset compensation intervals. For example, when the temperature range of -20°C to 0°C is detected, the corresponding red sub-pixel compensation coefficients R1, G1, and B1 are used. When the temperature range of -10°C to 0°C is detected, the corresponding red sub-pixel compensation coefficients R2, G2, and B2 are used. When the temperature range of 0°C to 10°C is detected, the corresponding red sub-pixel compensation coefficients R3, G3, and B3 are used. When the temperature range of 10°C to 20°C is detected, the corresponding red sub-pixel compensation coefficients R4, G4, and B4 are used. The compensation coefficients are applied to the gamma voltage of each sub-pixel, compensating for luminous brightness attenuation by changing the amplitude of the drive signal. Because red attenuation is significant at low temperatures, the compensation coefficients for the red sub-pixels are set larger to eliminate color shift. This application introduces a temperature perception and dynamic compensation mechanism to establish differentiated compensation strategies for different color sub-pixels. For example, considering that the lack of compensation for red sub-pixels at low temperatures will cause the light spot to turn red, this application effectively maintains the balance of the brightness of the three primary colors by dividing the temperature intervals and setting independent coefficients. In this way, this application solves the problems of brightness attenuation and color shift of fingerprint light spots in low temperature environments, and stabilizes the brightness and color of the light spot within the working range of the fingerprint recognition module. Through temperature-adaptive gamma compensation, the consistency of the light spot color is ensured at different ambient temperatures, avoiding unlocking failures caused by color shift, and improving the user experience in low temperature scenarios.

[0100] In one embodiment, Figure 3 As shown, the temperature sensor module 11 includes a first resistor R1, a second resistor R2, a capacitor C1 and an analog-to-digital converter; the first end of the first resistor R1 is used to access the input current control signal VCC, and the second end of the first resistor R1 is connected to the first end of the second resistor R2; the first end of the second resistor R2 is connected to the ground; the first end of the capacitor C1 is connected to the first end of the second resistor R2, and the second end of the capacitor C1 is connected to the second end of the second resistor R2; the second end of the first resistor R1 is connected to the first end of the analog-to-digital converter; the second end of the analog-to-digital converter is connected to the processor; wherein, the resistance value of the second resistor R2 changes with the ambient temperature corresponding to the fingerprint detection area; the resistance value of the second resistor is used to determine the first ambient temperature.

[0101] The second resistor R2 can be a resistor device whose resistance changes with temperature, and can be implemented specifically by a thermistor or a metal film resistor. Its resistance change is linearly or nonlinearly related to temperature, and the temperature change is converted into a voltage signal through a voltage divider circuit.

[0102] The analog-to-digital converter can be an integrated circuit that converts an analog voltage signal into a digital signal. Specifically, it can be implemented using a successive approximation converter or an integral converter, and the corresponding temperature value is calculated by quantizing the voltage value.

[0103] The capacitor C1 can be an energy storage element used for filtering, and can be specifically implemented by a ceramic capacitor or an electrolytic capacitor, which eliminates high-frequency noise interference in the circuit through the charging and discharging process.

[0104] Specifically, the input current control signal VCC flows through the first resistor R1 and the second resistor R2 to form a voltage divider circuit. The resistance of the second resistor R2 changes with the ambient temperature, causing the voltage at the voltage divider point to change. The capacitor filters the voltage at the voltage divider point and inputs it into the analog-to-digital converter. The analog-to-digital converter converts the voltage signal into a digital signal, and calculates the current ambient temperature value based on the pre-stored resistance-temperature correspondence, and finally transmits the temperature data to the processor. In other words, the resistor R1 and the thermistor R2 form a series voltage divider circuit, and the resistance ratio is equal to the voltage ratio. By looking up the resistance value of the thermistor corresponding to the temperature, the current ambient temperature value is obtained, and the temperature data is transmitted to the processor. This realizes the integration of the temperature detection function with the display panel, avoiding the external temperature sensor from occupying additional space.

[0105] This application embeds the temperature detection function into the display driver circuit by reusing the resistor network and signal processing unit on the display panel, reducing the number of components and circuit complexity. This allows real-time monitoring of temperature changes in the fingerprint detection area and converts the temperature signal into a processable electrical signal through the principle of resistor voltage division, providing accurate ambient temperature data for subsequent brightness compensation, thereby solving the problem of spot brightness and chromaticity deviation caused by color shift of the light-emitting device in low-temperature environments.

[0106] In one embodiment, the different compensation temperature intervals are divided according to the material properties of the screen of the display panel and the light-emitting properties of the light-emitting device.

[0107] Among them, the material properties of the screen body can be physical properties such as thermal expansion coefficient and transmittance change of the material constituting the display panel substrate or packaging layer when the temperature changes. Specifically, it can be achieved by using glass, polyimide or flexible polymer materials. These materials may deform or their optical properties may fluctuate at different temperatures, affecting the brightness and color consistency of the light spot in the display area.

[0108] The luminous characteristics of a light-emitting device can be expressed by the current-brightness response curve, luminous efficiency attenuation trend, and wavelength shift degree of the light-emitting device at different temperatures. Specifically, it can be achieved by using organic light-emitting diodes or quantum dot light-emitting devices. Such devices may experience brightness reduction or color coordinate shift in low-temperature environments, causing the light spot color to deviate from the target range.

[0109] Specifically, differences in the thermal expansion coefficients of screen materials can cause slight deformations in the spacing between pixel units when the temperature changes, thereby affecting the focusing effect of the light spot; and the luminous efficiency of the light-emitting device exhibits nonlinear decay as the temperature decreases, with different color sub-pixels having different attenuation slopes. By experimentally measuring the deformation and transmittance change data of the screen material at different temperatures, combined with the brightness output curve and color coordinate offset of the light-emitting device at the corresponding temperature, the temperature range can be divided into multiple intervals with similar material deformation characteristics and luminous attenuation laws. For example, in the range of -20°C to -10°C, the shrinkage rate of the screen material and the efficiency decay rate of the light-emitting device both show steep changes, so this interval is separately divided into a compensation temperature interval and matched with the corresponding brightness compensation coefficient.

[0110] As an example, different compensation temperature ranges can be divided into multiple compensation temperature ranges such as -20~-10℃, -10~0℃, 0~10℃, 10~20℃, and 20~30℃ according to the material properties of the display panel and the luminous properties of the light-emitting device.

[0111] This application establishes a multi-dimensional temperature interval division model by integrating the temperature response patterns of material properties and luminescence characteristics. This allows the compensation parameters to better align with actual physical change trends, thereby improving the ability to control the consistency of light spot brightness and chromaticity. In this way, the boundaries of the compensation temperature intervals can be dynamically adjusted to address the combined effects of screen material deformation and light-emitting device color shift at different temperatures, ensuring that the compensation coefficients within each interval accurately match the temperature response characteristics of the material and device. This solves the problem of reddening and insufficient brightness in the fingerprint detection area in low-temperature environments, and improves the success rate and response speed of fingerprint unlocking.

[0112] In one embodiment, the multiple sub-pixels in each of the pixel units include a red sub-pixel, a green sub-pixel and a blue sub-pixel, and the red sub-pixel, the green sub-pixel and the blue sub-pixel respectively include corresponding light-emitting devices and pixel circuits; wherein the compensation temperature intervals corresponding to sub-pixels of different colors are divided differently.

[0113] For example, in one embodiment, the red sub-pixel may be a sub-pixel unit using a red light emitting material, specifically, it may be implemented using aluminum indium gallium phosphide material, and its light emitting wavelength range is, for example, 620-750 nanometers. The green sub-pixel may be a sub-pixel unit using a green light emitting material, specifically, it may be implemented using gallium nitride material, and its light emitting wavelength range is, for example, 495-570 nanometers. The blue sub-pixel may be a sub-pixel unit using a blue light emitting material, specifically, it may be implemented using indium gallium nitride material, and its light emitting wavelength range is, for example, 450-495 nanometers. Different ways of dividing the compensation temperature interval can be to divide the temperature range into different interval segments according to the differences in the temperature characteristics of the light emitting materials of sub-pixels of different colors.

[0114] Specifically, in the fingerprint detection area of ​​the display panel, the temperature sensor module monitors the ambient temperature in real time and transmits it to the processor. The processor matches the corresponding compensation temperature intervals for the red, green, and blue sub-pixels according to the pre-established brightness compensation table. Due to differences in the temperature drift characteristics of different luminescent materials, for example, the brightness attenuation of red luminescent materials at low temperatures may be greater than that of blue materials, so it is necessary to set independent temperature interval division standards for each color sub-pixel. When it is detected that the current temperature is in a specific compensation interval corresponding to a certain sub-pixel, the processor calls the gamma compensation coefficient corresponding to the interval to perform brightness compensation on the corresponding color sub-pixel in the fingerprint detection area, thereby eliminating the chromaticity deviation caused by temperature changes.

[0115] By establishing a color-separated temperature compensation mechanism, this application can more accurately match the actual temperature response characteristics of each color sub-pixel. For example, in low-temperature environments, a higher frequency compensation interval is implemented for the red sub-pixel, thereby specifically suppressing the reddening of the light spot. This effectively solves the problem of fingerprint light spot color shift caused by the difference in brightness attenuation of different color sub-pixels in low-temperature environments, ensuring that the light spot chromaticity in the fingerprint detection area is always within the preset range, significantly improving the success rate of fingerprint recognition in low-temperature environments.

[0116] The details of the display panel can be found in the above embodiments and will not be repeated here.

[0117] The above is a detailed introduction to the display device, display method and display panel provided in the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A display device, characterized in that: include: A display panel, the display panel comprising a plurality of pixel units and a temperature sensor module; The temperature sensor module is provided corresponding to the fingerprint detection area provided on the display panel, and is used to monitor the first ambient temperature of the fingerprint detection area; each of the pixel units includes a plurality of sub-pixels, and the sub-pixels include a light-emitting device and a pixel circuit; A processor, connected to the display panel, is configured to query a preset brightness compensation table based on the first ambient temperature to obtain a target brightness compensation coefficient corresponding to the sub-pixel within a compensation temperature range corresponding to the first ambient temperature, so as to perform gamma compensation on each sub-pixel located in the fingerprint detection area; the brightness compensation table includes brightness compensation coefficients corresponding to different compensation temperature ranges.

2. The display device according to claim 1, wherein The temperature sensor module includes a first resistor, a second resistor, a capacitor, and an analog-to-digital converter; the first end of the first resistor is used to receive an input current control signal, the second end of the first resistor is connected to the first end of the second resistor; the first end of the second resistor is connected to the ground; the first end of the capacitor is connected to the first end of the second resistor, and the second end of the capacitor is connected to the second end of the second resistor; the second end of the first resistor is connected to the first end of the analog-to-digital converter; the second end of the analog-to-digital converter is connected to the processor; wherein the resistance value of the second resistor changes with the ambient temperature corresponding to the fingerprint detection area; The analog-to-digital converter is used to obtain the resistance value of the second resistor, determine the first ambient temperature according to the resistance value of the second resistor, and transmit the first ambient temperature to the processor.

3. The display device according to claim 1, wherein The multiple sub-pixels in each pixel unit include a red sub-pixel, a green sub-pixel and a blue sub-pixel, and the red sub-pixel, the green sub-pixel and the blue sub-pixel respectively include corresponding light-emitting devices and pixel circuits; wherein the compensation temperature intervals corresponding to sub-pixels of different colors are divided differently.

4. The display device according to claim 3, wherein: The processor is further configured to: Obtaining actual light spot brightness and chromaticity corresponding to the fingerprint detection area at different ambient temperatures, and determining deviation parameters between the actual light spot brightness and chromaticity and the target light spot brightness and chromaticity; Iteratively optimizing the gamma compensation coefficient of each sub-pixel in the fingerprint detection area according to the deviation parameter until the value of the deviation parameter reaches a target threshold, and determining the optimized gamma compensation coefficient of each sub-pixel as the corresponding target brightness compensation coefficient; Determining a brightness compensation coefficient corresponding to each compensation temperature interval based on each of the ambient temperatures and the corresponding target brightness compensation coefficient; The brightness compensation table is established according to each compensation temperature interval and the corresponding brightness compensation coefficient.

5. The display device according to claim 4, wherein: The brightness compensation coefficient includes a first brightness compensation coefficient, a second brightness compensation coefficient, and a third brightness compensation coefficient; the first brightness compensation coefficient represents the gamma value compensation coefficient corresponding to the red sub-pixel; The second brightness compensation coefficient represents a gamma value compensation coefficient corresponding to the green sub-pixel; The third brightness compensation coefficient represents the gamma value compensation coefficient corresponding to the blue sub-pixel; each compensation temperature interval corresponds to one first brightness compensation coefficient, one second brightness compensation coefficient, and one third brightness compensation coefficient.

6. The display device according to claim 5, wherein: The display device further includes a memory; the memory is connected to the processor; The memory is used to store the brightness compensation table; The processor is further configured to determine a target compensation temperature interval in which the first ambient temperature is located based on the brightness compensation table, and determine a target brightness compensation coefficient corresponding to the first ambient temperature from the brightness compensation table based on the target compensation temperature interval.

7. The display device according to any one of claims 1 to 6, characterized in that: The display device further includes a display interface controller; the display interface controller is connected to the processor and the display panel respectively; The processor is further configured to write the target brightness compensation coefficient into the display interface controller; The display interface controller is configured to store reference gamma values ​​corresponding to the red sub-pixel, the green sub-pixel, and the blue sub-pixel, respectively, within the fingerprint detection area at a second ambient temperature; The compensated target gamma values ​​corresponding to the red sub-pixel, the green sub-pixel, and the blue sub-pixel are determined based on the target brightness compensation coefficient and the corresponding reference gamma value, so as to drive the display panel for display.

8. A display method, characterized in that: Applied to the display device according to any one of claims 1 to 7, the method comprises: Based on the first ambient temperature of the fingerprint detection area monitored by the temperature sensor module, a preset brightness compensation table is queried to obtain a target brightness compensation coefficient corresponding to each sub-pixel in the fingerprint detection area within a compensation temperature range corresponding to the first ambient temperature, so as to perform gamma compensation on each sub-pixel located in the fingerprint detection area; the brightness compensation table includes brightness compensation coefficients corresponding to different compensation temperature ranges.

9. The display method according to claim 8, characterized in that: The method further comprises: Obtaining actual light spot brightness and chromaticity corresponding to the fingerprint detection area at different ambient temperatures, and determining deviation parameters between the actual light spot brightness and chromaticity and the target light spot brightness and chromaticity; Iteratively optimizing the gamma compensation coefficient of each sub-pixel in the fingerprint detection area according to the deviation parameter until the value of the deviation parameter reaches a target threshold, and determining the optimized gamma compensation coefficient of each sub-pixel as the corresponding target brightness compensation coefficient; Determining a brightness compensation coefficient corresponding to each compensation temperature interval based on each of the ambient temperatures and the corresponding target brightness compensation coefficient; The brightness compensation table is established according to each compensation temperature interval and the corresponding brightness compensation coefficient.

10. A display panel, characterized in that: The device comprises a plurality of pixel units and a temperature sensor module; the temperature sensor module is arranged corresponding to the fingerprint detection area set on the display panel, and is used to monitor the first ambient temperature of the fingerprint detection area; each of the pixel units comprises a plurality of sub-pixels, and the sub-pixels include a light-emitting device and a pixel circuit; A preset brightness compensation table is queried based on the first ambient temperature to obtain a target brightness compensation coefficient corresponding to the sub-pixel in the compensation temperature range corresponding to the first ambient temperature, so as to perform gamma compensation on each sub-pixel located in the fingerprint detection area; the brightness compensation table includes brightness compensation coefficients corresponding to different compensation temperature ranges.

11. The display panel according to claim 10, wherein: The temperature sensor module includes a first resistor, a second resistor, a capacitor and an analog-to-digital converter; the first end of the first resistor is used to access the control signal of the input current, and the second end of the first resistor is connected to the first end of the second resistor; the first end of the second resistor is connected to the ground; the first end of the capacitor is connected to the first end of the second resistor, and the second end of the capacitor is connected to the second end of the second resistor; the second end of the first resistor is connected to the first end of the analog-to-digital converter; wherein the resistance value of the second resistor changes with the ambient temperature corresponding to the fingerprint detection area; the resistance value of the second resistor is used to determine the first ambient temperature.

12. The display panel according to claim 10, wherein: The multiple sub-pixels in each pixel unit include a red sub-pixel, a green sub-pixel and a blue sub-pixel, and the red sub-pixel, the green sub-pixel and the blue sub-pixel respectively include corresponding light-emitting devices and pixel circuits; wherein the compensation temperature intervals corresponding to sub-pixels of different colors are divided differently.

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