Display color temperature and brightness self-adjusting system based on ambient light perception

Abstract

The invention provides a display color temperature and brightness self-adjusting system based on ambient light perception. The ambient light sensing module integrates a brightness sensor and a color temperature sensor, covers a wide-range brightness and color temperature acquisition range, and is matched with a multi-region sampling unit and an anti-shielding detection unit, so that misjudgment caused by single-direction light source interference and sensor shielding is effectively avoided, and the accuracy and stability of ambient light parameter acquisition are ensured; the data filtering unit eliminates the influence of instantaneous fluctuation through mean filtering processing, and provides reliable input for an adjustment algorithm; the brightness mapping sub-algorithm, the color temperature mapping sub-algorithm and the collaborative optimization sub-algorithm are adopted, parameter calculation is carried out based on a CIE1931 standard chromaticity system and a CIE1976LAB color space, dynamic adaptation of the brightness and the color temperature is achieved, the coupling problem of the brightness and the color temperature is solved, the consistency of the perceived brightness under different color temperatures is ensured through synchronous correction of the brightness, and the quality of the color temperature is improved. The problem that vision is too bright under the warm color temperature or brightness is insufficient under the cold color temperature is solved, and visual fatigue is remarkably reduced.

Description

Technical Field

[0001] This invention relates to the field of display color temperature and brightness self-adjustment technology, and more specifically, to a display color temperature and brightness self-adjustment system based on ambient light sensing. Background Technology

[0002] With the development of display technology, monitors have become the core equipment for people's daily work, study and entertainment. However, the color temperature and brightness adjustment of traditional monitors mostly rely on manual operation by users or are based on fixed preset modes (such as "day / night mode"), which cannot adapt to dynamically changing ambient light conditions in real time. In different ambient light scenarios (such as direct sunlight, low light environments, or indoor lighting with significant color temperature differences), fixed display parameters may lead to a decline in visual experience. For example, insufficient brightness under strong light will cause the image to be blurry, while excessive brightness or color temperature under low light can easily cause visual fatigue, and long-term use may even affect eye health. In addition, some self-adjustment solutions in existing technologies only adjust brightness or color temperature individually, without achieving synergistic optimization of both, making it difficult to balance display performance and eye protection needs. Therefore, we have made improvements and proposed a display color temperature and brightness self-adjustment system based on ambient light perception. Summary of the Invention

[0003] This invention provides a display color temperature and brightness self-adjustment system based on ambient light perception. The ambient light perception module includes a brightness sensor and a color temperature sensor, which are used to collect the brightness and color temperature values ​​of ambient light in real time and output digital signals to the control processing module. Control processing module: Built-in storage unit and adjustment algorithm, the adjustment algorithm includes brightness mapping sub-algorithm, color temperature mapping algorithm and collaborative optimization sub-algorithm, used to receive digital signals from ambient light sensing module, calculate target color temperature and brightness parameters in combination with CIE1931 standard colorimetric system, and generate control commands; Display driver module: includes a backlight driver unit and a color temperature adjustment unit. After receiving instructions from the control processing module, the display driver module adjusts the color temperature and brightness of the display.

[0004] As a preferred technical solution of this application, the backlight driving unit is connected to the control processing module through a PWM signal. After receiving the target display brightness command output by the control processing module, it controls the luminous intensity of the display backlight by adjusting the duty cycle of the PWM signal to achieve brightness adjustment. The color temperature adjustment unit is connected to the control processing module via an I2C bus. After receiving the target display color temperature command output by the control module, it sends a control signal to the color temperature control chip of the display panel to adjust the light emission ratio of the RGB sub-pixels in the display panel, thereby achieving color temperature adjustment.

[0005] As a preferred technical solution of this application, it also includes a user interaction module, which includes physical buttons and a software interaction interface. The physical buttons include at least an "on / off" button and a "mode switch" button.

[0006] As a preferred technical solution of this application, the luminance mapping sub-algorithm is specifically as follows: Establish a non-linear mapping relationship between ambient light luminance value Le and target luminance value Ld of the display, satisfying the formula: Wherein, Lmin is the minimum brightness threshold, Lmax is the maximum brightness threshold, and Le,max is the upper limit of ambient light brightness; When the ambient light level is below the preset lower limit, the night mode is triggered, which forcibly limits the display brightness to 10-30 cd / m²; when the ambient light level is above the preset upper limit, the bright light mode is triggered, which increases the brightness to 80%-100% of the maximum threshold.

[0007] As a preferred technical solution of this application, the color temperature mapping sub-algorithm is specifically as follows: Based on the ambient light color temperature (Te) and time information, the target color temperature (Td) is dynamically calculated: If the time is during the daytime (6:00-18:00) and Te≥5000K, then Td=Te×0.9±500K, in the range of 5000K-6500K; If the time is during the nighttime period (18:00-6:00), or Te < 3000K, then Td = 2700K + (Te - 1800K) × 0.3, with a range of 2700K-3500K.

[0008] As a preferred technical solution of this application, the collaborative optimization sub-algorithm is used to solve the coupling problem between color temperature and brightness, including: When adjusting the color temperature, the brightness value is corrected simultaneously. Based on the luminance parameters in the CIE1976LAB color space, ensure the consistency of perceived brightness of the display under different color temperatures.

[0009] As a preferred technical solution of this application, the ambient light sensing module further includes: Anti-obstruction detection unit: It uses an infrared distance sensor to determine whether the sensor is obstructed. If the obstruction lasts for more than 3 seconds, it will automatically switch to the default parameters and issue a prompt. Multi-area sampling unit: includes several distributed sensors facing the front, top and sides of the screen respectively, and takes the weighted average of the data from multiple areas as the ambient light input.

[0010] As a preferred technical solution of this application, the user interaction module further includes: Mode memory module: Stores at least 3 sets of user-defined modes. Each mode contains an independent brightness curve, color temperature curve and sensitivity parameters. Users can switch between modes using shortcut keys. Adjustment Preview Window: The OSD menu displays the current ambient light parameters and the simulated effect after adjustment in real time. Ambient light parameters include brightness / Lux and color temperature / K. The simulated effect includes a split-screen comparison of the display differences between the original parameters and the target parameters.

[0011] As a preferred technical solution of this application, it also includes a power management module, which is connected to an external power interface.

[0012] As a preferred technical solution of this application, the control processing module also has a built-in data filtering unit, which is used to perform mean filtering on the collected data transmitted by the ambient light sensing module; the window length of the mean filtering is set to 3-5 sampling periods.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: In the scheme of this application: 1. The ambient light sensing module of this application integrates a brightness sensor and a color temperature sensor, covering a wide range of brightness and color temperature acquisition. Combined with a multi-area sampling unit and an anti-occlusion detection unit, it effectively avoids interference from a single-direction light source and misjudgments caused by sensor occlusion, ensuring the accuracy and stability of ambient light parameter acquisition. The data filtering unit eliminates the influence of instantaneous fluctuations through mean filtering, providing reliable input for the adjustment algorithm. 2. This application employs a luminance mapping sub-algorithm, a color temperature mapping sub-algorithm, and a collaborative optimization sub-algorithm. Based on the CIE1931 standard colorimetric system and the CIE1976LAB color space, parameter calculations are performed. This achieves dynamic adaptation of luminance and color temperature while resolving the coupling problem between the two. By synchronously correcting luminance, it ensures consistent perceived luminance under different color temperatures, avoiding the problem of excessive brightness under warm color temperatures or insufficient luminance under cool color temperatures, and significantly reducing visual fatigue. Attached Figure Description

[0014] Figure 1 A schematic diagram of the display color temperature and brightness self-adjustment system based on ambient light sensing provided in this application; Figure 2 A flowchart illustrating the usage of the ambient light-sensing-based display color temperature and brightness self-adjustment system provided in this application. Detailed Implementation

[0015] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0016] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the embodiments of the present invention can be combined with each other.

[0017] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0018] For an example, please refer to... Figures 1-2 A display color temperature and brightness self-adjustment system based on ambient light sensing, comprising: Ambient light sensing module: The ambient light sensing module includes a brightness sensor (selected from photodiode, CMOS image sensor or silicon-based photovoltaic cell) and a color temperature sensor (selected from multi-channel spectral sensor or RGB color sensor) to collect the brightness value (measurement range 0.1-100000 Lux) and color temperature value (measurement range 1800K-20000K) of ambient light in real time, and output digital signals to the control processing module; Control processing module: It adopts ARM Cortex-M series microprocessor or FPGA chip, with built-in storage unit (capacity not less than 64KB) and adjustment algorithm. The adjustment algorithm includes brightness mapping sub-algorithm, color temperature mapping sub-algorithm and collaborative optimization sub-algorithm. It is used to receive digital signals from ambient light sensing module, calculate target color temperature and brightness parameters in combination with CIE1931 standard color system, and generate control commands. Display driver module: Includes backlight driver unit and color temperature adjustment unit. After receiving instructions from the control processing module, the display driver module adjusts the color temperature and brightness of the display.

[0019] Furthermore, the backlight driving unit is connected to the control processing module via a PWM signal. After receiving the target display brightness command output by the control processing module, it controls the backlight intensity of the display by adjusting the duty cycle of the PWM signal (adjustment range 0-100%) to achieve brightness adjustment. The color temperature adjustment unit is connected to the control processing module via the I2C bus. After receiving the target display color temperature command output by the control module, it sends a control signal to the color temperature control chip of the display panel to adjust the light emission ratio of the RGB sub-pixels in the display panel, thereby achieving color temperature adjustment.

[0020] Furthermore, the user interaction module includes physical buttons and a software interface. The physical buttons include at least an "on / off" button and a "mode switch" button.

[0021] Furthermore, the luminance mapper algorithm is as follows: Establish a non-linear mapping relationship between ambient light luminance value (Le) and target luminance value of the display (Ld), satisfying the formula: Wherein, Lmin is the minimum brightness threshold (5-20 cd / m²), Lmax is the maximum brightness threshold (200-1000 cd / m²), Le,max is the upper limit of ambient light brightness (50000-100000 Lux); k is the adjustment coefficient (range 0.8-1.2), used to adapt to the light emission characteristics of different types of displays (such as LCD, OLED), fine-tune the steepness of the nonlinear mapping curve, and ensure the consistency of adjustment feel across different devices; Le is the real-time ambient light brightness value (unit: Lux) collected by the ambient light sensing module, with a value range of 0.1-100000 Lux; When the ambient light level is below the preset lower limit (e.g., <10 Lux), night mode is triggered, forcibly limiting the monitor brightness to 10-30 cd / m²; when the ambient light level is above the preset upper limit (e.g., >50000 Lux), high-brightness mode is triggered, increasing the brightness to 80%-100% of the maximum threshold. Furthermore, the color temperature mapper algorithm is as follows: The target color temperature (Td) is dynamically calculated based on the ambient light color temperature (Te) and time information (obtained via the computer's clock module): If the time is during the daytime (6:00-18:00) and Te≥5000K, then Td=Te×0.9±500K, in the range of 5000K-6500K; If the time is during the nighttime period (18:00-6:00), or Te < 3000K, then Td = 2700K + (Te - 1800K) × 0.3, with a range of 2700K-3500K.

[0022] Furthermore, a collaborative optimization sub-algorithm is used to address the coupling problem between color temperature and brightness, including: When adjusting the color temperature, the brightness value is corrected simultaneously. For example, when switching from a cool color temperature (6500K) to a warm color temperature (3000K), if the original brightness is 300cd / m², the brightness is automatically reduced to 250-280cd / m² to compensate for the increase in visual perceived brightness under a warm color temperature. Based on the lightness (L) in the CIE1976LAB color space The parameters are set to ensure consistent perceived brightness of the display under different color temperatures, with a deviation range of ≤±5%.

[0023] Furthermore, the ambient light sensing module also includes: Anti-obstruction detection unit: It uses an infrared distance sensor to determine whether the sensor is obstructed. If the obstruction lasts for more than 3 seconds, it will automatically switch to the default parameters (such as brightness 200cd / m², color temperature 4500K) and issue a prompt. Multi-area sampling unit: includes several distributed sensors facing the front, top and sides of the screen respectively, and takes the weighted average of data from multiple areas as the ambient light input to avoid misjudgment caused by a single-direction light source (such as direct light from a desk lamp).

[0024] Furthermore, the user interaction module also includes: Mode memory module: Stores at least 3 sets of user-defined modes (such as "reading mode", "game mode" and "night mode"). Each mode contains an independent brightness curve, color temperature curve and sensitivity parameters, which users can switch through shortcut keys; Adjustment Preview Window: The OSD menu displays the current ambient light parameters and the simulated effect after adjustment in real time. Ambient light parameters include brightness / Lux and color temperature / K. The simulated effect includes a split-screen comparison of the display differences between the original parameters and the target parameters.

[0025] Furthermore, it also includes a power management module, which connects to an external power interface to provide voltage to the ambient light sensing module, control processing module, and display driver module.

[0026] Furthermore, the control processing module also has a built-in data filtering unit, which is used to perform mean filtering on the collected data transmitted by the ambient light sensing module. The window length for mean filtering is set to 3-5 sampling periods to eliminate the deviation in the collected data caused by instantaneous fluctuations in ambient light and to ensure the stability of the target display parameter calculation.

[0027] During use, the ambient light sensing module collects the brightness value (measurement range 0.1-100000 Lux) and color temperature value (measurement range 1800K-20000K) of the ambient light in real time and outputs digital signals. The control processing module receives the digital signal output by the ambient light sensing module, first performs mean filtering on the collected data through the data filtering unit (the window length is set to 3-5 sampling periods), and then calculates the target color temperature and brightness parameters by combining the CIE1931 standard color system and the built-in adjustment algorithm to generate control commands. The display driver module receives control commands from the control processing module and adjusts the brightness and color temperature of the display through the backlight driver unit and the color temperature adjustment unit, respectively. The backlight driver unit controls the backlight intensity of the display by adjusting the duty cycle of the PWM signal (adjustment range 0-100%). The color temperature adjustment unit sends control signals to the color temperature control chip of the display panel to adjust the light emission ratio of the RGB sub-pixels in the display panel.

[0028] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] Obviously, the embodiments described above are merely some embodiments of the present invention, not all embodiments. The accompanying drawings show preferred embodiments of the present invention, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms; rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this invention.

Claims

1. A display color temperature and brightness self-adjustment system based on ambient light sensing, characterized in that, include: Ambient light sensing module: The ambient light sensing module includes a brightness sensor and a color temperature sensor, which are used to collect the brightness and color temperature values ​​of ambient light in real time and output digital signals to the control processing module. Control processing module: Built-in storage unit and adjustment algorithm, the adjustment algorithm includes brightness mapping sub-algorithm, color temperature mapping algorithm and collaborative optimization sub-algorithm, used to receive digital signals from ambient light sensing module, calculate target color temperature and brightness parameters in combination with CIE1931 standard colorimetric system, and generate control commands; Display driver module: includes a backlight driver unit and a color temperature adjustment unit. After receiving instructions from the control processing module, the display driver module adjusts the color temperature and brightness of the display.

2. The display color temperature and brightness self-adjustment system based on ambient light perception according to claim 1, characterized in that, The backlight driving unit is connected to the control processing module via a PWM signal. After receiving the target display brightness command output by the control processing module, it controls the luminous intensity of the display backlight by adjusting the duty cycle of the PWM signal to achieve brightness adjustment. The color temperature adjustment unit is connected to the control processing module via an I2C bus. After receiving the target display color temperature command output by the control module, it sends a control signal to the color temperature control chip of the display panel to adjust the light emission ratio of the RGB sub-pixels in the display panel, thereby achieving color temperature adjustment.

3. The display color temperature and brightness self-adjustment system based on ambient light perception according to claim 1, characterized in that, It also includes a user interaction module, which consists of physical buttons and a software interface. The physical buttons include at least an "on / off" button and a "mode switch" button.

4. The display color temperature and brightness self-adjustment system based on ambient light perception according to claim 1, characterized in that, The brightness mapping sub-algorithm is specifically as follows: Establish a non-linear mapping relationship between ambient light luminance value Le and target luminance value Ld of the display, satisfying the formula: Wherein, Lmin is the minimum brightness threshold, Lmax is the maximum brightness threshold, and Le,max is the upper limit of ambient light brightness; When the ambient light level is below the preset lower limit, the night mode is triggered, which forcibly limits the display brightness to 10-30 cd / m²; when the ambient light level is above the preset upper limit, the bright light mode is triggered, which increases the brightness to 80%-100% of the maximum threshold.

5. The display color temperature and brightness self-adjustment system based on ambient light perception according to claim 1, characterized in that, The color temperature mapping sub-algorithm is specifically as follows: Based on the ambient light color temperature (Te) and time information, the target color temperature (Td) is dynamically calculated: If the time is during the daytime (6:00-18:00) and Te≥5000K, then Td=Te×0.9±500K, in the range of 5000K-6500K; If the time is during the nighttime period (18:00-6:00), or Te < 3000K, then Td = 2700K + (Te - 1800K) × 0.3, with a range of 2700K-3500K.

6. The display color temperature and brightness self-adjustment system based on ambient light perception according to claim 1, characterized in that, The collaborative optimization sub-algorithm is used to solve the coupling problem between color temperature and brightness, including: When adjusting the color temperature, the brightness value is corrected simultaneously. Based on the luminance parameters in the CIE1976LAB color space, ensure the consistency of perceived brightness of the display under different color temperatures.

7. The display color temperature and brightness self-adjustment system based on ambient light perception according to claim 1, characterized in that, The ambient light sensing module also includes: Anti-obstruction detection unit: It uses an infrared distance sensor to determine whether the sensor is obstructed. If the obstruction lasts for more than 3 seconds, it will automatically switch to the default parameters and issue a prompt. Multi-area sampling unit: includes several distributed sensors facing the front, top and sides of the screen respectively, and takes the weighted average of the data from multiple areas as the ambient light input.

8. The display color temperature and brightness self-adjustment system based on ambient light perception according to claim 3, characterized in that, The user interaction module also includes: Mode memory module: Stores at least 3 sets of user-defined modes. Each mode contains an independent brightness curve, color temperature curve and sensitivity parameters. Users can switch between modes using shortcut keys. Adjustment Preview Window: The OSD menu displays the current ambient light parameters and the simulated effect after adjustment in real time. Ambient light parameters include brightness / Lux and color temperature / K. The simulated effect includes a split-screen comparison of the display differences between the original parameters and the target parameters.

9. The display color temperature and brightness self-adjustment system based on ambient light perception according to claim 1, characterized in that, It also includes a power management module, which is connected to an external power interface.

10. The display color temperature and brightness self-adjustment system based on ambient light perception according to claim 1, characterized in that, The control processing module also has a built-in data filtering unit, which is used to perform mean filtering on the collected data transmitted by the ambient light sensing module; the window length of the mean filtering is set to 3-5 sampling periods.

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