Display device

Abstract

Embodiments of the present application relate to a display device, comprising: a color temperature sensing module; a frame; a display screen, the display screen being provided with a light transmission area for allowing ambient light to be incident on the color temperature sensing module, the display screen being assembled to the frame and a gap being formed between the display screen and the frame; and a proximity light module, the proximity light module being arranged corresponding to the gap. The display device can reduce the size of the opening of the light transmission area, thereby suppressing the recess problem of the opening to the soft screen structure. By moving the proximity light module away from the display area of the display screen, the signal quantity and sensitivity of the proximity light module are improved, and the problem of the light source of the proximity light module affecting the flash point of the display screen is solved. At the same time, by placing the color temperature sensing module under the light transmission area of the display screen, the size of the opening of the light transmission area can be greatly reduced, thereby reducing the influence of the light leakage of the display screen on the sensing result of the color temperature sensing module, so that the color temperature sensing module can accurately detect the brightness and color temperature of the ambient light, and then adjust the display color temperature of the display screen.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display device. Background Technology

[0002] With the continuous development of display technology, people have increasingly higher requirements for the display quality of display devices. For example, people hope that display devices can accurately adjust the display state according to environmental conditions, so that the display device can be clearly viewed in various scenarios. However, the current technology's optical sensing modules are not set up reasonably enough to accurately detect environmental conditions, resulting in insufficient accuracy in adjusting the display state. Summary of the Invention

[0003] Therefore, it is necessary to provide a display device that can accurately detect environmental conditions and adjust the display status in order to address the above-mentioned technical problems.

[0004] This application provides a display device, including:

[0005] Color temperature sensing module;

[0006] Frame;

[0007] A display screen, wherein the display screen has a light-transmitting area for allowing ambient light to enter the color temperature sensing module, the display screen is mounted on the frame, and a gap is formed between the display screen and the frame; and

[0008] Approaching the optical module, the gap is set accordingly.

[0009] The aforementioned display device, by separating the color temperature sensing module from the proximity light module, allows the proximity light module to be placed in the gap between the display screen and the frame, thereby reducing the opening size of the light-transmitting area and suppressing the indentation problem of the opening on the flexible screen structure. Furthermore, by moving the proximity light module away from the display area, both the signal strength and sensitivity of the proximity light module are improved, and the problem of the proximity light module's light source affecting the display screen's flickering is solved. This allows the proximity light module to accurately detect whether the display device is near a human body and turn off the display screen when appropriate. Simultaneously, by placing the color temperature sensing module under the light-transmitting area of ​​the display screen, the opening size of the light-transmitting area can be significantly reduced, thereby minimizing the impact of light leakage from the display screen on the sensing results of the color temperature sensing module. This allows the color temperature sensing module to accurately detect the brightness and color temperature of the ambient light and adjust the display screen's color temperature accordingly. Therefore, the display device of this embodiment can accurately detect environmental conditions and adjust the display state of the screen. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the structure of a display device according to one embodiment;

[0012] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the display device.

[0013] Figure 3 This is a schematic diagram showing a PWM dimming mode according to one embodiment;

[0014] Figure 4 This is a schematic diagram of the black frame and the light-transmitting area in one embodiment;

[0015] Figure 5 This is a schematic diagram of the structure of a color temperature sensing module according to one embodiment;

[0016] Figure 6 This is a first schematic diagram of an ambient light incident on a color temperature sensing module in one direction, according to an embodiment.

[0017] Figure 7 for Figure 6 A second schematic diagram of the ambient light incident on the color temperature sensing module in one direction according to the embodiment;

[0018] Figure 8 for Figure 6 A third schematic diagram of the ambient light incident on the color temperature sensing module in one direction according to the embodiment;

[0019] Figure 9 This is a schematic diagram of an ambient light incident color temperature sensing module in another direction, according to one embodiment.

[0020] Figure 10 A control flowchart of a color temperature sensing module according to one embodiment;

[0021] Figure 11 This is a schematic diagram of the PWM signals for the high-brightness and low-brightness regions in one embodiment.

[0022] Component designation explanation:

[0023] Color temperature sensing module: 100; Color temperature sensing unit: 110; Frame: 200; Display screen: 300; Light-transmitting area: 310; Proximity light module: 400; Light source: 410; Proximity light sensor: 420; Cover glass: 500. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0025] It is understood that the terms "first," "second," etc., used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first direction may be referred to as a second direction, and similarly, a second direction may be referred to as a first direction.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. "Several" means at least one, such as one, two, etc., unless otherwise explicitly specified.

[0027] This application provides a display device. Figure 1 This is a schematic diagram of the structure of a display device according to one embodiment. Figure 2 for Figure 1 The schematic diagram of the cross-sectional structure of the display device shown is in the cross-sectional direction. Figure 1 The direction of the dotted line, in conjunction with reference Figure 1 and Figure 2 The display device includes a color temperature sensing module 100, a frame 200, a display screen 300, and a proximity light module 400. A cover glass 500 can be installed on the frame 200 to protect the display screen 300 and the color temperature sensing module 100 and proximity light module 400 located below the display screen 300.

[0028] The color temperature sensing module 100 may include a color temperature sensor and a signal processing circuit (not shown) connected to the color temperature sensor. The color temperature sensor typically includes multiple color temperature channels, such as R, G, B, and Clear channels. These channels can generate photoelectric reactions to red, green, blue, and visible light in ambient light, respectively, and output corresponding response values. The signal processing circuit converts the response values ​​from analog signals to digital signals and transmits the converted signals to the controller, enabling the controller to obtain the illuminance values ​​of each color in the ambient light, thereby obtaining the color temperature of the ambient light. Currently, the color temperature and automatic backlight of the display screen 300 can be adjusted using the sensing results of the color temperature sensing module 100. Specifically, when the ambient light color temperature is low, the display color of the display screen 300 can be adjusted to be warmer to prevent glare and protect the eyes; when the ambient light color temperature is high, the display color of the display screen 300 can be adjusted to be cooler to achieve a vibrant display effect. When the ambient light sensitivity value is high, the backlight level of the display screen 300 can be increased to make the content displayed on the display screen 300 clearer; when the ambient light sensitivity value is low, the backlight level of the display screen 300 can be decreased to make the display screen 300 less glaring in dark environments.

[0029] The proximity light module 400 includes a light source 410 and a proximity light sensor 420. The light source 410 emits detection light, and the proximity light sensor 420 receives the reflected light from obstacles. Based on the numerical relationship between the intensity of the detection light and the intensity of the reflected light, the controller can determine whether obstacles such as human bodies exist within the detection range. The light source 410 can be an infrared light source. For example, when a user makes or receives a phone call through the display device, the infrared light source emits infrared energy, and the proximity light sensor 420 obtains the magnitude of the energy reflected from the face to determine whether the user has brought the display device close to their face, thereby automatically turning the screen on and off.

[0030] In related technologies, a dual-structure color temperature sensor and proximity sensor are typically used, receiving light signals through the same light-transmitting area. However, due to the larger size of the dual-structure, a larger light-transmitting area is required, which poses a risk of screen denting for flexible screen structures. Moreover, an excessively large light-transmitting area can also cause light leakage from the screen itself, generating more noise that shines onto the color temperature sensing module, resulting in inaccurate calculated light and color temperature information.

[0031] Therefore, this application embodiment adopts a novel under-display color temperature scheme. The display screen 300 is provided with a light-transmitting area 310, which is used to allow ambient light to enter the color temperature sensing module 100. The shape of the light-transmitting area 310 may be, but is not limited to, rectangular. The display screen 300 is mounted on the frame 200, and a gap is formed between the display screen 300 and the frame 200. The proximity light module 400 corresponds to the gap between the display screen 300 and the frame 200. Specifically, the frame 200 includes a border and a bottom plate, and the proximity light module 400 corresponds to the gap between the display screen 300 and the border. Compared to a scheme where the two-in-one structure is entirely under the screen, this embodiment can significantly reduce the area of ​​the light-transmitting area 310, thereby suppressing the light leakage effect of the display screen 300. Furthermore, compared to a scheme where the two-in-one structure is entirely under the screen, this embodiment has lower requirements for the width of the gap, thus effectively reducing the black border between the display screen 300 and the frame 200, making it more suitable for full-screen applications. Alternatively, the color temperature sensor of the color temperature sensing module 100 may be placed in the light-transmitting area 310, and the signal processing circuit of the color temperature sensing module 100 may be placed outside the light-transmitting area 310, thereby reducing the area of ​​the light-transmitting area 310.

[0032] In this embodiment, by separating the color temperature sensing module 100 from the proximity light module 400, the proximity light module 400 can be positioned at the gap between the display screen 300 and the frame 200, thereby reducing the opening size of the light-transmitting area 310 and suppressing the indentation problem of the light-transmitting area 310 opening on the flexible screen structure. Furthermore, by moving the proximity light module 400 away from the display area of ​​the display screen 300, both the signal strength and sensitivity of the proximity light module 400 are improved, and the flickering problem caused by the light source 410 of the proximity light module 400 affecting the display screen 300 is solved. This allows the proximity light module 400 to accurately detect whether the display device is close to a human body and, when appropriate, turn off the display screen 300. Meanwhile, by placing the color temperature sensing module 100 under the light-transmitting area 310 of the display screen 300, the opening size of the light-transmitting area 310 can be significantly reduced, thereby minimizing the impact of light leakage from the display screen 300 on the sensing results of the color temperature sensing module 100. This allows the color temperature sensing module 100 to accurately detect the brightness and color temperature of the ambient light, and thus adjust the display color temperature of the display screen 300. Therefore, the display device of this embodiment can accurately detect environmental conditions and adjust the display state of the display screen 300 accordingly.

[0033] In one embodiment, the display adjusts its brightness using PWM (Pulse Width Modulation), and a color temperature sensing module is used to collect ambient light when each pixel in the light-transmitting area displays a black frame. Specifically, PWM dimming mode refers to the method of changing the brightness of the display 300 based on the alternation of its on and off states. In other words, in PWM dimming mode, the display 300 does not emit light continuously when it is on, but rather switches between being on and off continuously, so that the human eye perceives the actual brightness of the display 300 as the required display brightness. Specifically, the longer the screen is off, the lower the perceived brightness of the display 300. The shorter the screen is off, the higher the perceived brightness of the display 300.

[0034] Figure 3 This is a schematic diagram of a PWM dimming mode according to one embodiment. When the display screen in PWM dimming mode is photographed at an extremely fast shutter speed, the following can be obtained: Figure 3 The diagram shows a display where some pixels are lit, while the rest are off. The lighting and ignition of pixels are controlled by a PWM signal, and each pixel receives slightly different PWM signals at any given time, resulting in the observed effect. Figure 3 The image shows stripes, with the position of the black stripes shifting over time. Specifically, pixels in the black stripe area can be understood as currently receiving a low-level PWM signal; these pixels do not emit light, resulting in a black frame. Pixels in the remaining area can be understood as currently receiving a high-level PWM signal; these pixels emit light, and the brightness corresponds to the image to be displayed. It should be noted that... Figure 3 The number of stripes shown is for illustrative purposes only and is not intended to limit the scope of protection of this application. In this embodiment, during the integration time of the color temperature sensing module, each pixel in the light-transmitting area of ​​the display screen is kept as a black frame, so that the light-sensing data collected by the color temperature sensing module is almost unaffected by light leakage from the display screen, thereby improving the accuracy of the color temperature sensing results.

[0035] In one embodiment, the first dimension of the light-transmitting area 310 in the first direction is positively correlated with the display refresh rate of the display screen 300 and also positively correlated with the second dimension of the display screen 300 in the first direction. The first direction refers to the refresh direction of the display screen 300. Specifically, taking the example where the scan lines of the display screen 300 extend along the row direction and the data lines extend along the column direction, the refresh direction of the display screen 300 refers to the column direction. For ease of explanation, the row direction will be referred to as the X-direction and the column direction as the Y-direction below. Therefore, the timing of black frames in each area of ​​the display screen can be determined based on the display refresh rate and the second dimension of the display screen in the first direction, thereby setting the light-transmitting area accordingly. Specifically, the higher the display refresh rate and the faster the refresh speed, the larger the first dimension of the light-transmitting area needs to be to ensure sufficient ambient light is incident on the color temperature sensing module during the black frame time. Moreover, since the width of the black frame is positively correlated with the second dimension of the display screen, the larger the second dimension, the larger the first dimension of the light-transmitting area can be. It is understandable that some displays currently have variable refresh rates. For these displays, to ensure that the color temperature sensing module can always collect sufficient light data, the light-transmitting area needs to be set based on the display's highest refresh rate. For example, if the display's highest refresh rate is 120Hz, but it can be displayed at 60Hz or 15Hz in some cases, the first size of the light-transmitting area still needs to be calculated using 120Hz as the display refresh rate. In this embodiment, based on the display's inherent second size and highest display refresh rate, the first size of the light-transmitting area can be accurately adjusted. This minimizes the size of the light-transmitting area while ensuring that the color temperature sensing module can collect sufficient light data, thus suppressing the display's camber problem.

[0036] In one embodiment, the first dimension satisfies the following formula:

[0037] First preset duration

[0038] Where L1 is the first size, L2 is the second size, f is the display refresh rate, and the first preset duration is determined based on the black frame width of the display and the sensitivity of the color temperature sensing module. Specifically, Figure 4 This is a schematic diagram of the black frame and the light-transmitting area in one embodiment, with reference to... Figure 4 L2*f can be understood as the speed at which the black frame travels along the Y direction. Since L1 is the first dimension of the light-transmitting area, therefore... This can be understood as the time it takes for the black frame to travel along the Y-axis through the light-transmitting area, measured in seconds. The time it takes for the black frame to travel along the Y-axis through the light-transmitting area can also be expressed as... Furthermore, since the sensitivity of the color temperature sensing module determines the integration time and time margin of light sensing, the sensitivity of the color temperature sensing module must be taken into account when designing the light-transmitting area. Specifically, the integration time of the color temperature sensing module is negatively correlated with its sensitivity; that is, the higher the sensitivity of the color temperature sensing module, the shorter the required integration time. The time margin is related to the integration time; specifically, it is positively correlated with the integration time of the color temperature sensing module. The longer the integration time required by the color temperature sensing module, the longer the time margin needs to be set. For example, if the integration time required by the color temperature sensing module is 50μs, the time margin can be set at a 1:1 ratio of 50μs to ensure that the color temperature sensing module can collect sufficient light-sensing data. It can be understood that the width of the black frame should not be less than the sum of the time it takes for the black frame to travel through the first dimension of the light-transmitting area, the integration time of the color temperature sensing module, and the time margin, thereby ensuring that the pixels in the light-transmitting area always display a black frame when the color temperature sensing module collects light-sensing data.

[0039] In one embodiment, the first preset duration can be: black frame width - integral time of the color temperature sensing module - time margin. As explained above, if the display refresh rate is adjustable, the black frame width here needs to be calculated based on the minimum black frame width of the display. Further, the black frame width of the display is related to the display's PWM refresh rate; specifically, the black frame width is determined jointly based on the display's PWM refresh rate and black frame duty cycle. For example, with a display PWM refresh rate of 1920Hz and a black frame duty cycle of 32.6%, the corresponding black frame width is 167μs. Therefore, combining the integral time and time margin of the color temperature sensing module, both being 50μs, the first preset duration can be determined as 167-50-50=67μs. Correspondingly, taking a second size of 160mm for the display device and a maximum display refresh rate of 120Hz as an example, the first size needs to be set to no more than 1.29mm. Considering a tolerance of approximately ±0.2mm, for example, the first size can be designed to be 1mm. In this embodiment, by comprehensively considering the minimum black frame width of the display screen and the sensitivity of the color temperature sensing module, the first preset duration can be determined more accurately, thereby determining the upper limit of the first size of the light-transmitting area, and thus setting the light-transmitting area more accurately. In actual setting, the first size of the light-transmitting area can be designed to be larger than the size of the color temperature sensing module in the first direction. This ensures that all light passing through the light-transmitting area can be incident on the color temperature sensing module, and also reduces the impact of assembly tolerances on the light sensing results.

[0040] In one embodiment, the first dimension is 0.4 mm to 1 mm. Assuming the first dimension L1 is designed to be 0.4 mm to 1 mm with a tolerance of ±0.2 mm, the time it takes for the black frame to travel through the light-transmitting area of ​​the first dimension 0.4 mm is... The time it takes for the black frame to travel through the first 1mm of the light-transmitting area is With an integration time and time margin of 50μs for the color temperature sensing module, the corresponding minimum black frame width is 131.25μs to 162.5μs. These parameter settings can adapt to most display scenarios for color temperature sensing.

[0041] Figure 5 This is a schematic diagram of the structure of a color temperature sensing module 100 according to one embodiment, with reference to... Figure 5 In one embodiment, the color temperature sensing module 100 includes two color temperature sensing units 110. Each color temperature sensing unit 110 includes a plurality of color temperature channels arranged along a second direction. Figure 5 In the illustrated embodiment, a color temperature sensing unit 110 includes four color temperature channels, namely R, G, B, and Clear. Two color temperature sensing units 110 are arranged symmetrically along an axis, with the axis of symmetry extending along a first direction. The first direction is the refresh direction of the display screen 300, and the second direction is perpendicular to the first direction. In some examples, a color temperature sensing unit 110 may include multiple color temperature channels of the same color; this embodiment does not impose such a limitation.

[0042] Figure 6 This is a first schematic diagram of an ambient light incident on a color temperature sensing module according to an embodiment. Figure 6 The observation direction is perpendicular to the display surface of the screen. It is understandable that, in one example, this is done in conjunction with a reference... Figure 6 and Figure 7 If the ambient light source is from, for example Figure 6 and Figure 7 If the incident light is incident in the direction shown, then the effect on each color temperature channel is consistent. Specifically, the incident light can be directly incident on the color temperature sensing module 100, or it can be incident on the color temperature sensing module 100 at an angle. Figure 7 for Figure 6 A second schematic diagram of the ambient light incident on the color temperature sensing module in one direction according to the embodiment. Figure 7 The observation direction is parallel to the display surface of the screen, reference. Figure 7 Direct light refers to the incident light being parallel to the target plane, which is the plane where the first direction is located and the thickness direction of the display screen is located, and is perpendicular to the light-receiving surface of the color temperature sensing module 100. Figure 8 for Figure 6 A third schematic diagram of the ambient light incident on the color temperature sensing module along one direction in the embodiment. Figure 8 The observation direction is also parallel to the display surface of the screen. In another example, combined with a reference... Figure 6 and Figure 8Angled incidence refers to incident light whose incident direction is parallel to the target plane and has a non-zero angle with the light-receiving surface of the color temperature sensing module 100. This non-zero angle can be θ. If the light intensity is A when the incident light is direct, then the light intensity when incident at an angle is A*cosθ. If the ambient light source is from... Figure 9 The incident light is incident in the direction shown, meaning there is a non-zero angle between the incident light and the target plane. Assuming the ambient light is incident from the left, taking the blue channel as an example, the blue channel of the left color temperature sensing unit 110 is closer to the ambient light source and receives a larger light intensity, while the blue channel of the right color temperature sensing unit 110 is farther from the ambient light source and receives a smaller light intensity. Compensation can be made based on the light sensing data of the two blue channels, thereby suppressing the influence of the incident angle of the ambient light on the sensing results and improving the accuracy of the color temperature sensing module 100.

[0043] In one embodiment, the color temperature sensing module 100 further includes an analog-to-digital converter (ADC). The ADC is connected to the color temperature channels of the same color in each color temperature sensing unit 110, and is used to accumulate and convert the response values ​​of multiple color temperature channels of the same color. Multiple ADCs are used, each connected to a different color temperature channel. That is, if the color temperature sensing module 100 is used to sense the color temperature of four colors, with two color temperature channels corresponding to each color, then four ADCs can be configured: two red color temperature channels connected to the first ADC, two green color temperature channels connected to the second ADC, two blue color temperature channels connected to the fourth ADC, and two Clear color temperature channels connected to the fourth ADC. In this embodiment, the accumulation of response values ​​is achieved through circuit connections, which is simple and can achieve the required compensation effect, effectively improving the sensing accuracy of the color temperature sensing module 100 for ambient light sources with various incident angles.

[0044] In one embodiment, the display device further includes a diffusion film disposed on the light transmission path of the color temperature sensing module 100. Specifically, the diffusion film can cover the light-transmitting area 310 of the display screen 300 or the surface of the color temperature sensing module 100. When ambient light passes through the diffusion film, which uses PET as a substrate or the like, it passes through a medium with a different refractive index, causing numerous refractions, reflections, and scattering phenomena, thereby correcting the light into a uniform surface light source to achieve the effect of optical diffusion. It is understood that in related technologies, since the color temperature sensing module 100 and the proximity light module 400 are integrated, the diffusion film will severely affect the amount of infrared proximity signal, thus making it impossible to achieve the effect of uniform light using a diffusion film in related technologies. However, in this embodiment, based on the separately configured color temperature sensing module 100 and proximity light module 400, the proximity light module 400 can be avoided only on the light transmission path of the color temperature sensing module 100. This further suppresses the problem of inconsistent proportional shift of the sensing results of each color temperature channel with the change of angle without affecting the signal quantity of the proximity light module 400.

[0045] In one embodiment, the color temperature sensing module 100 is configured with an external clock interface for transmitting a synchronization clock signal. The color temperature sensing module 100 determines the period for collecting ambient light based on the synchronization clock signal, and the display screen 300 refreshes the displayed image based on the synchronization clock signal. It is understood that the color temperature sensing scheme in this application, which performs color temperature sensing while displaying a black frame in the light-transmitting area 310, relies on a stable and accurate clock signal. If the clock of the color temperature sensing module 100 is not synchronized with the clock of the display screen 300, it is possible that the light-transmitting area 310 is already displaying a non-black frame while the color temperature sensing module 100 is still collecting data, resulting in the color temperature sensing module 100 being affected by light leakage from the display screen 300. Therefore, the operation of the color temperature sensing module 100 needs to be synchronized with the refresh of the display screen 300 to improve the accuracy of color temperature sensing. The internal clock of the color temperature sensing module 100 is typically an RC clock, which generally only guarantees an error within ±3%, while the external clock is typically a crystal oscillator, whose error can be controlled within 100ppm. In this embodiment, the color temperature sensing module 100 directly uses the external clock signal as its clock signal source; that is, the color temperature sensing module 100 uses the same clock as the display screen 300, thereby achieving clock alignment and synchronization.

[0046] In one embodiment, the color temperature sensing module 100 includes an internal clock and is configured with an external clock interface for transmitting a synchronization clock signal. The color temperature sensing module 100 calibrates its internal clock based on the synchronization clock signal and determines the period for collecting ambient light based on the internal clock signal output by the internal clock. The display screen 300 refreshes the displayed image based on the synchronization clock signal. It is understood that if the color temperature sensing module 100 directly uses the external clock signal as its clock signal source, it needs to continuously receive signals from the external clock interface. If the external clock interface experiences a brief disconnection, the color temperature sensing module 100 may be unable to collect data in a timely manner. Therefore, this embodiment can use the external clock signal to calibrate the internal RC clock while simultaneously calling the internal RC clock, thereby reducing errors caused by clock drift.

[0047] In one embodiment, the display device further includes a controller. The controller is connected to the color temperature sensing module 100 to control the color temperature sensing module 100 to collect ambient light at appropriate times. Figure 10 Here is a control flowchart of a color temperature sensing module according to one embodiment, with reference to Figure 10 The controller is configured to perform the following steps: Step 1002, based on determining that the current PWM refresh rate of the display screen 300 is less than or equal to a preset refresh rate threshold, obtain the current display brightness of the display screen 300. Step 1004, based on determining that the display brightness is greater than a first brightness threshold, determine a first integral time period according to the display brightness, and control the color temperature sensing module 100 to sense within the first integral time period having a second preset duration to obtain the color temperature of the ambient light. Specifically, the brightness of each pixel located in the light-transmitting area within the first integral time period is less than or equal to a second brightness threshold, and the second brightness threshold is less than the first brightness threshold. Figure 11 This is a schematic diagram of the PWM signals for the high-brightness and low-brightness regions in one embodiment, with reference to... Figure 11 The black frame duty cycle of a display screen in the high-brightness range differs from that in the actual high-brightness range. Currently, the black frame duty cycle of common displays in the high-brightness range is typically 18.7%, meaning that the black frame width accounts for 18.7% of the total width of the display screen in the first direction. The high-brightness range can be determined based on the specific design of the display screen. For example, a range with a display brightness greater than 135 nits can be defined as the high-brightness range, and a range with a display brightness no greater than 135 nits can be defined as the low-brightness range. It is understood that the first brightness threshold can also be 165 nits, 200 nits, etc., and this embodiment does not limit it. The first brightness threshold refers to the brightness used to distinguish whether it is in the high-brightness range, such as the aforementioned 135 nits. The second brightness threshold can be 0 nits.

[0048] Table 1 shows the black frame widths corresponding to multiple PWM refresh rates. Referring to Table 1, for a light-transmitting area with a first size of 0.4mm, for a display with a PWM refresh rate of 1440Hz, the aforementioned black frame algorithm can be used to calculate the light sensitivity and color temperature values ​​across the entire brightness range. Specifically, when the display brightness is greater than the first brightness threshold, for example, greater than 135 nits, for a light-transmitting area with a first size of 0.4mm, the time it takes for the black frame to travel through the light-transmitting area is approximately 31μs. Therefore, the sum of the time reserved for the color temperature sensing module and the time margin is only 98μs. Thus, only a small integration time and time margin can be set, for example, setting the second preset duration to 50μs.

[0049] Table 1. Black Frame Width Corresponding to Multiple PWM Refresh Rates

[0050] Highlighted area low brightness range 1440Hz An 18.7% black frame duty cycle corresponds to a 129μs black frame width. A 32.6% black frame duty cycle corresponds to a 224μs black frame width. 1920Hz An 18.7% black frame duty cycle corresponds to a 96.6μs black frame width. A 32.6% black frame duty cycle corresponds to a 167μs black frame width.

[0051] Furthermore, for displays with a PWM refresh rate of 1920Hz, a black frame algorithm can be used in the low brightness range, while a dual-integral algorithm or a screenshot algorithm can be used to calculate the light sensitivity and color temperature values ​​in the high brightness range. Specifically, referring to Table 1, for displays with a PWM refresh rate of 1920Hz, when the display brightness is too high, the corresponding black frame width is only 96.6μs. If the minimum integration time supported by the color temperature sensing module is 50μs, and the corresponding time margin needs to be set to 50μs, then the sum of the two is greater than the black frame width of 96.6μs, making data acquisition impossible. Therefore, other algorithms are needed to calculate the light sensitivity and color temperature values ​​to avoid errors in the light sensitivity data. Therefore, compared to the light-transmitting area setting method in related technologies, this embodiment can adapt to displays with high PWM refresh rates to a certain extent, and adjust the size of the light-transmitting area and the data acquisition method according to the PWM refresh rate of the display, thereby greatly expanding the application scenarios.

[0052] In one embodiment, the controller is further configured to control the color temperature sensing module to sense within a second integral time period having a third preset duration, based on determining that the display brightness is less than or equal to a first brightness threshold. Specifically, the brightness of each pixel located in the light-transmitting area is less than or equal to the second brightness threshold during the second integral time period, and the third preset duration is longer than the second preset duration. Specifically, when the display brightness is less than or equal to the first brightness threshold, for example, less than 135 nits, for a light-transmitting area with a first size of 0.4 mm, the time it takes for a black frame to pass through the light-transmitting area is approximately 31 μs. Referring to Table 1, the sum of the time reserved for the color temperature sensing module and the time margin is 224 - 31 = 193 μs, allowing for a larger integration time and time margin to be set, for example, setting the second preset duration to 100 μs. Therefore, for displays with low PWM refresh rates, the first size of the light-transmitting area of ​​the display is sufficient to ensure that the black frame width has enough margin. This allows for a longer integration time to be selected for the color temperature sensing module than in the current solution, thereby improving the sensitivity and signal-to-noise ratio of the color temperature sensing module and obtaining more accurate light and color temperature values.

[0053] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above embodiments merely illustrate several implementation methods of the embodiments of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the embodiments of this application, and these all fall within the protection scope of the embodiments of this application. Therefore, the protection scope of the patent for the embodiments of this application should be determined by the appended claims.

Claims

1. A display device, characterized in that, include: Color temperature sensing module; Frame; The display screen adjusts its brightness using pulse width modulation. The display screen has a light-transmitting area for allowing ambient light to enter the color temperature sensing module. The first size of the light-transmitting area in a first direction is positively correlated with the display refresh rate of the display screen and positively correlated with the second size of the display screen in the first direction, where the first direction is the refresh direction of the display screen. The display screen is mounted on the frame, the frame including a frame and a base plate; and The proximity light module is separate from the color temperature sensing module and is positioned to correspond to the gap between the display screen and the frame. The color temperature sensing module is used to collect ambient light when each pixel in the light-transmitting area displays a black frame.

2. The display device according to claim 1, characterized in that, The first dimension satisfies the following formula: Wherein, L1 is the first size, L2 is the second size, f is the display refresh rate of the display screen, and the first preset duration is determined based on the black frame width of the display screen and the sensitivity of the color temperature sensing module.

3. The display device according to claim 2, characterized in that, The first preset duration satisfies the following formula: First preset duration = black frame width - integral time of color temperature sensing module - time margin; The black frame width is determined based on the PWM refresh rate and black frame duty cycle of the display screen. The integration time of the color temperature sensing module is negatively correlated with the sensitivity of the color temperature sensing module, and the time margin is positively correlated with the integration time.

4. The display device according to claim 1, characterized in that, The first dimension is 0.4 mm to 1 mm.

5. The display device according to any one of claims 1 to 4, characterized in that, The color temperature sensing module includes two color temperature sensing units, each of which includes multiple color temperature channels arranged along a second direction. The two color temperature sensing units are arranged symmetrically along an axis, and the axis of symmetry extends along a first direction. Wherein, the first direction is the refresh direction of the display screen, and the second direction is perpendicular to the first direction.

6. The display device according to claim 5, characterized in that, The color temperature sensing module also includes: An analog-to-digital converter is connected to the color temperature channel of the same color in each of the color temperature sensing units, and is used to accumulate and convert the response values ​​of multiple color temperature channels of the same color into analog-to-digital signals. The number of analog-to-digital converters is multiple, and each analog-to-digital converter is connected to a color temperature channel of a different color.

7. The display device according to claim 5, characterized in that, Also includes: A diffusion film is disposed on the light transmission path of the color temperature sensing module.

8. The display device according to any one of claims 1 to 4, characterized in that, The color temperature sensing module is equipped with an external clock interface, which is used to transmit a synchronization clock signal. The color temperature sensing module is used to determine the time period for collecting ambient light based on the synchronization clock signal, and the display screen is used to refresh the displayed image based on the synchronization clock signal.

9. The display device according to any one of claims 1 to 4, characterized in that, The color temperature sensing module includes an internal clock and is configured with an external clock interface for transmitting a synchronization clock signal. The color temperature sensing module is used to calibrate the internal clock according to the synchronization clock signal and determine the time period for collecting ambient light according to the internal clock signal output by the internal clock. The display screen is used to refresh the displayed image according to the synchronization clock signal.

10. The display device according to any one of claims 1 to 4, characterized in that, Also includes: A controller is connected to the color temperature sensing module. The controller is configured to obtain the current display brightness of the display screen based on determining that the current PWM refresh rate of the display screen is less than or equal to a preset refresh rate threshold. Based on the determination that the display brightness is greater than a first brightness threshold, a first integration period is determined according to the display brightness, and the color temperature sensing module is controlled to sense within the first integration period with a second preset duration to obtain the color temperature of the ambient light. Wherein, the brightness of each pixel located in the light-transmitting area during the first integration period is less than or equal to a second brightness threshold, and the second brightness threshold is less than the first brightness threshold.

11. The display device according to claim 10, characterized in that, The controller is also configured to control the color temperature sensing module to perform sensing within a second integral time period having a third preset duration based on determining that the display brightness is less than or equal to the first brightness threshold. Wherein, the brightness of each pixel located in the light-transmitting area during the second integration period is less than or equal to the second brightness threshold, and the third preset duration is longer than the second preset duration.

12. The display device according to claim 10, characterized in that, The first brightness threshold is 135 nits, and the second brightness threshold is 0 nits.

13. The display device according to claim 1, characterized in that, The proximity light module includes: A light source used to emit detection light; A proximity light sensor is used to receive the reflected light from the obstacle after the detection light is reflected back.

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