TW201351389A - Method and electronic apparatus for adaptively adjusting screen brightness according to ambient light - Google Patents

Abstract

A method and an electronic apparatus for adaptively adjusting screen brightness according to ambient light are provided. In the method, an illumination section of a light sensor corresponding to a current brightness of a screen is obtained, in which a range of the illumination that the light sensor detects the ambient light is divided into a plurality of illumination sections which are respectively corresponding to a plurality of screen brightness. Next, the light sensor is used to detect an illumination of current ambient light and compared with the obtained illumination section, so as to accordingly adjust the screen brightness. When the illumination exceeds an upper limit of the illumination section by more than a present value, a current brightness of the screen is adjusted to a first target brightness in a level higher than a current level. When the illumination exceeds a lower limit of the illumination section by more than the present value, the current brightness of the screen is adjusted to a second target brightness in a level lower than the current level.

Description

Method for adjusting screen brightness according to environmental light source adaptability and electronic equipment Set

The present invention relates to a method and a device for adjusting the brightness of a screen, and more particularly to a method and an electronic device for adjusting the brightness of a screen according to changes in ambient light source and user operation.

Portable electronic devices such as mobile phones and tablet computers are often equipped with Ambient Light Sensors (ALS) to adjust the brightness of the device screen in time according to changes in ambient light sources. The purpose of this technology is to allow the user to view a screen of appropriate brightness under different ambient light sources.

1(a) to (c) are schematic diagrams showing the adjustment of the brightness of a screen according to an ambient light source. 1(a) to (c), the brightness of the screen 122 of the mobile device 12 changes significantly as the relative position between the user's mobile device 12 and the ambient light source 14 is different. However, in the environment of the same ambient light source, the relative position or angle between the angle at which the user's eye 16 views the screen 122 and the angle of the light of the ambient light source 14 is constantly changing, causing the light sensor 124 to sense the value of the ambient light source 14. The variability is too large, and the brightness of the screen 122 is adjusted too dark. Such adjustments often cause user confusion and may therefore turn off automatic adjustment of the screen brightness.

When a portable electronic device is used with a light sensor, the brightness of the screen is generally changed according to the amount of change of the ambient light source detected by the light sensor, but the design may change the position and angle of the screen continuously by the user. Make The illuminance value received by the light sensor is constantly changing, and the brightness of the screen is indirectly changed. If the illuminance value is just at the boundary of the two illuminance intervals defined by the device, the slight difference in illuminance value will cause the brightness of the screen to alternate between the two levels, resulting in a situation of flickering and dimming, which will result in the use of The discomfort of the eyes.

In view of this, the present invention provides a method and an electronic device for adjusting the brightness of a screen according to the adaptability of an ambient light source, which can adjust the brightness of the screen according to the change of the ambient light source, and avoid the situation that the screen is flickering and dimming.

The invention provides a method for adjusting the brightness of a screen according to the adaptability of an ambient light source, and is suitable for an electronic device including a photo sensor and a screen. The method is to obtain an illuminance interval of the photo sensor corresponding to the current brightness value of the screen, wherein the photo sensor detects the external illuminance value and the numerical range is divided into consecutive illuminance intervals, and the illuminance intervals respectively correspond to For multiple screen brightness values. Then, the photosensor is used to detect the current external illuminance value, and compared with the obtained illuminance interval, the screen brightness value is adjusted accordingly. Wherein, when the illuminance value is higher than the upper limit of the illuminance interval by a preset value, the current brightness value of the screen is adjusted to the first target brightness value of the higher first order; and when the illuminance value is lower than the lower limit of the illuminance interval, the preset is lower. At the time of the value, the current brightness value of the screen is adjusted to the second target brightness value of the lower first order.

In an embodiment of the invention, the method for adjusting the brightness of the screen further comprises recording a value range of each illumination interval and a corresponding screen brightness value in a look-up table (LUT).

In an embodiment of the invention, the step of adjusting the screen brightness value of the screen includes querying the lookup table to find a screen brightness value higher than the current brightness value as the first target brightness value, or finding the current brightness value. The lower first order brightness value is used as the second target brightness value.

In an embodiment of the present invention, the comparing the illuminance value and the illuminance interval, according to the step of adjusting the screen brightness value of the screen, further comprises: when the illuminance value falls below the upper limit of the illuminance interval plus the preset value and the illuminance interval Maintain the original screen brightness value when the limit value is subtracted from the preset value range.

In an embodiment of the present invention, when the illuminance value is higher than the upper limit of the illuminance interval by a preset value, the method for adjusting the brightness of the screen further includes detecting the illuminance of the external light by using the photo sensor every predetermined time. a value, determining whether the illuminance values are higher than the upper limit of the illuminance interval by a preset value, and accumulating the number of illuminance values higher than the upper limit of the illuminance interval by a preset value, and when the accumulated number exceeds the threshold value , adjust the current brightness value of the screen to the first target brightness value of the first higher order.

In an embodiment of the present invention, when the illuminance value is lower than the lower limit of the illuminance interval by a preset value, the method for adjusting the brightness of the screen further includes detecting the illuminance value of the external light by using the photo sensor every predetermined time. , determining whether the illuminance values are lower than the lower limit of the illuminance interval by a preset value, and accumulating the number of illuminance values lower than the lower limit of the illuminance interval by a preset value, and when the accumulated number exceeds the threshold value, the screen is displayed The current brightness value is adjusted to the second target brightness value of the lower first order.

In an embodiment of the invention, after the step of adjusting the screen brightness value of the screen, the method for adjusting the brightness of the screen further comprises spacing a predetermined time. After the interval, the photo sensor is used again to detect the external illuminance value, and the illuminance value comparison and the screen brightness value adjustment step are re-executed.

The invention provides an electronic device comprising a screen, a light sensor, a storage medium and a controller. The photo sensor is configured to detect an external illuminance value, wherein the photo sensor detects the illuminance value and the numerical range is divided into consecutive illuminance intervals, and the illuminance intervals respectively correspond to multiple screens of the screen. Brightness value. The storage medium is used to store a lookup table, and the value range of each illumination interval and the corresponding screen brightness value are recorded in the lookup table. The controller is connected to the screen, the light sensor and the storage medium, and is used to obtain the illuminance interval corresponding to the current brightness value of the screen and the illuminance value detected by the light sensor, and compare the illuminance value and the illuminance interval. To adjust the screen brightness value of the screen. Wherein, when the illuminance value is higher than the upper limit of the illuminance interval by a preset value, the controller adjusts the current brightness value of the screen to the first target brightness value of the first order; when the illuminance value is lower than the lower limit of the illuminance interval, the preset is lower than the preset value. At the time of the value, the controller adjusts the current brightness value of the screen to the second target brightness value of the lower first order.

In an embodiment of the present invention, the controller queries the lookup table in the storage medium to find a screen brightness value higher than the current brightness value as the first target brightness value, or finds that the current brightness value is lower than the current brightness value. The first-order screen brightness value is used as the second target brightness value.

In an embodiment of the present invention, the controller maintains the screen when the illuminance value falls within the upper limit of the illuminance interval plus the preset value and the lower limit of the illuminance interval minus the preset value. The original screen brightness value.

In an embodiment of the invention, the controller is further scheduled every other time. The time receiving photo sensor detects the external illuminance value, and accumulates the number of illuminance values higher than the upper limit of the illuminance interval by a preset value, and when the accumulated number exceeds a threshold, the current brightness of the screen is The value is adjusted to the first target luminance value of the first order.

In an embodiment of the present invention, the controller receives the illuminance value of the external light sensor every other predetermined time, and accumulates the number of illuminance values lower than the lower limit value of the illuminance interval by a preset value, When the accumulated number exceeds a threshold, the current brightness value of the screen is adjusted to the second target brightness value of the lower first order.

In an embodiment of the invention, the controller further detects the ambient light value by using the light sensor every predetermined time, and re-measures the illumination value and adjusts the brightness value of the screen.

Based on the above, the method and the electronic device for adapting the brightness of the screen according to the environmental light source of the present invention divide the numerical range of the light illuminance value detected by the light sensor into a continuous plurality of illuminance intervals, and determine the current illuminance value. In the illuminance interval, the range of the illuminance interval is expanded, and only when the illuminance value exceeds the expanded range, the screen brightness is adjusted to be higher or lower by one step. In this way, it is possible to avoid the slight change of the ambient light source causing the screen to flicker and dim.

The above described features and advantages of the present invention will be more apparent from the following description.

In order to solve the problem, the screen is slightly changed due to slight changes in the ambient light source. In the dark case, the present invention divides the numerical range of the illuminance value detected by the photo sensor into a plurality of illuminance intervals, and when determining whether the illuminance interval in which the illuminance value is changed, the illuminance used as the judgment basis is used. The range of the interval is increased to avoid the problem that the brightness caused by the variability of the illuminance value often changes under the same ambient light source.

FIG. 2 is a block diagram of an electronic device according to an embodiment of the invention. Referring to FIG. 2, the electronic device 20 of the embodiment is, for example, a mobile phone, a tablet computer, a notebook computer, etc., and is adapted to provide a user to operate under different ambient light sources. The electronic device 20 includes a screen 22, a photo sensor 24, a storage medium 26 and a controller 28, the functions of which are as follows:

The screen 22 is, for example, a liquid crystal display (LCD), a Light-Emitting Diode (LED) display, a Field Emission Display (FED), or other types of displays for displaying electronic The screen output by the device 20 is provided for viewing by the user.

The light sensor 24 is, for example, an Ambient Light Sensor (ALS), which is disposed on the same side of the screen 24, for example, to detect the illuminance value of the ambient light source in front of the screen 24. The numerical range of the light sensor 24 for detecting the illuminance value is divided into a plurality of consecutive illuminance intervals, and the illuminance intervals respectively correspond to the plurality of screen brightness values of the screen 22 .

The storage medium 26 is, for example, a storage device such as a hard disk or a memory for storing a lookup table. For example, the range of values for each illuminance interval and the corresponding screen brightness value are recorded in this lookup table.

The controller 28 is, for example, a central processing unit (CPU), or other programmable general purpose or special purpose microprocessor (Microprocessor), digital signal processor (DSP), programmable Controllers, Application Specific Integrated Circuits (ASICs), Programmable Logic Devices (PLDs), or other similar devices, or combinations of these devices, with the screen 22, the light sensor 24 The storage medium 26 is connected, and the brightness of the screen 22 can be adaptively adjusted according to the illuminance value detected by the photo sensor 24. The following is a detailed description of an embodiment.

FIG. 3 illustrates a method for adjusting brightness of a screen according to an environment light source according to an embodiment of the invention. Referring to FIG. 3, the screen brightness adjustment method of the present embodiment is applied to the electronic device 20 of FIG. 2, and the detailed steps of the method are described below with the components in FIG. 2:

First, the illuminance section of the photo sensor 24 corresponding to the current luminance value of the screen 22 is obtained by the controller 28 (step S302). The current brightness value of the screen 22 is adjusted according to the illuminance value detected by the photo sensor 24 last time or the illuminance interval where the illuminance value is located, and therefore corresponds to the illuminance value or the illuminance interval. For example, it will be recorded in the storage medium 26, and can be accessed by the controller 28 to compare with the subsequently detected illuminance values to determine whether to perform the brightness adjustment of the screen 22.

Next, the controller 28 detects the current external illuminance value by using the photo sensor 24 (step S304). In one embodiment, the photo sensor 24 detects the illuminance value of the ambient light source, for example, every predetermined time and provides it to the controller 28. In another embodiment, the photo sensor 24 can also The illuminance value is activated and detected according to the control of the controller 28, and the controller 28 sends a control signal to the photo sensor 42 by, for example, when the user presses the power button or other button of the electronic device 20. The light sensor 42 is controlled to detect the illuminance value.

After the controller 28 obtains the current illuminance value, the illuminance value is compared with the illuminance interval, and the screen brightness value of the screen 22 is adjusted accordingly. In detail, the controller 28 determines, for example, whether the illuminance value is higher than the upper limit of the illuminance interval by a predetermined value (step S306). If the controller 28 determines that the illuminance value is higher than the upper limit of the illuminance interval by the preset value, the current brightness value of the screen 22 is adjusted to the first target brightness value of the higher first order (step S308).

On the other hand, if the controller 28 determines that the illuminance value is not higher than the upper limit of the illuminance interval by the preset value, it is further determined whether the illuminance value is lower than the lower limit of the illuminance interval by the preset value (step S310). If the controller 28 determines that the illuminance value is lower than the lower limit of the illuminance interval by the preset value, the current brightness value of the screen 22 is adjusted to the second target brightness value of the lower first order (step S312). On the other hand, if the controller 28 determines that the illuminance value is not lower than the lower limit of the illuminance interval, the illuminance value is the upper limit of the illuminance interval plus the preset value and the lower limit of the illuminance interval minus the pre-predetermined value. Set the value within the range of values. At this time, the controller 28 maintains the screen 22 at the original screen brightness value (step S314).

It should be noted that after adjusting the brightness value of the screen 24, the controller 28 also continuously receives the illuminance value detected by the photo sensor 22 every predetermined time, or controls the photo sensor 22 to detect every predetermined time. Measure the illuminance value, And the above comparison of the illuminance value and the adjustment step of the brightness value of the screen are performed again, thereby achieving the effect of adaptively adjusting the brightness of the screen.

By the above method, the influence of the illumination variation of the ambient light source on the brightness of the screen can be minimized, thereby solving the problem of flickering and dimming, and providing a more comfortable viewing environment for the user.

It should be noted that, in the above embodiment, the illuminance value is used as a basis for determining whether the illuminance interval is changed and whether the brightness of the screen is adjusted. In another embodiment, multiple consecutive illuminance values or units may be used. A plurality of discontinuous illuminance values are used as a basis for judging whether the illuminance interval is changed, thereby providing a more objective criterion and more in line with the actual change of the ambient light source. The following is a detailed description of an embodiment.

FIG. 4 illustrates a method for adjusting brightness of a screen according to an environmental light source according to an embodiment of the invention. Referring to FIG. 4, the screen brightness adjustment method of the present embodiment is applied to the electronic device 20 of FIG. 2, and the detailed steps of the method are described below with the components in FIG. 2:

First, the illuminance section of the photo sensor 24 corresponding to the current luminance value of the screen 22 is obtained by the controller 28 (step S402). Next, the controller 28 detects the current external illuminance value by using the photo sensor 24 (step S404). After the controller 28 obtains the current illuminance value, the illuminance value is compared with the illuminance interval, and the screen brightness value of the screen 22 is adjusted accordingly. For example, the controller 28 determines whether the illuminance value is higher than the upper limit of the illuminance interval by a preset value (step S406), and determines whether the illuminance value is lower than the lower limit of the illuminance interval by the preset value (step S408). The implementations of the foregoing steps S402 to S408 are the same as or similar to the steps S302 to S308 in the foregoing embodiment, and thus the details thereof are not described herein again.

Different from the foregoing embodiment, when the controller 28 of the embodiment determines that the illuminance value is higher than the upper limit value of the illuminance interval, the controller 28 further accumulates the upper limit of the illuminance interval higher than the preset value. The number of illuminance values, and determines whether the number exceeds a threshold (step S410). When the accumulated number exceeds the threshold value, the controller 28 adjusts the current brightness value of the screen 22 to the first target brightness value of the first higher order (step S412).

In contrast, when determining that the illuminance value is lower than the lower limit of the illuminance interval by the preset value, the controller 28 further accumulates the number of the plurality of illuminance values lower than the lower limit of the illuminance interval by the preset value, and determines the number. Whether it exceeds a threshold (step S414). When the accumulated number exceeds the threshold value, the controller 28 adjusts the current brightness value of the screen 22 to the second target brightness value of the lower first order (step S416).

Finally, if the controller 28 determines that the illuminance value is not lower than the lower limit of the illuminance interval by a preset value, that is, the illuminance value falls below the illuminance interval and the preset value and the illuminance interval are lower than the lower limit. Set the value within the range of values. At this time, the controller 28 maintains the screen 22 at the original screen brightness value (step S418).

By the above method, the controller 28 adjusts the brightness of the screen 22 only when the ambient light source is excessively large and continuous, thereby avoiding misjudgment caused by slight changes in the position or angle of the screen under the same ambient light source, thereby solving the problem. Clear and dark problems, but can provide users with a more comfortable The viewing environment.

In summary, the method and the electronic device for adapting the brightness of the screen according to the ambient light source adaptively expand the range of the illuminance interval in which the illuminance value is determined, and when the illuminance value falls outside the range one or more times, Only increase or decrease the brightness of the screen by one step, so as to avoid slight fluctuations in the ambient light source, which can provide a more comfortable viewing environment for the user.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

12‧‧‧Mobile devices

122, 22‧‧‧ screen

124, 24‧‧‧Light sensor

14‧‧‧Environmental light source

16‧‧‧ eyes

20‧‧‧Electronic devices

26‧‧‧Storage media

28‧‧‧ Controller

S302~S314‧‧‧ method steps for adapting the brightness of the screen according to the ambient light source according to an embodiment of the invention

S402~S418‧‧‧ method steps for adjusting the brightness of the screen according to the environment light source according to an embodiment of the present invention

1(a) to (c) are schematic diagrams showing the adjustment of the brightness of a screen according to an ambient light source.

FIG. 2 is a block diagram of an electronic device according to an embodiment of the invention.

FIG. 3 illustrates a method for adjusting brightness of a screen according to an environment light source according to an embodiment of the invention.

FIG. 4 illustrates a method for adjusting brightness of a screen according to an environmental light source according to an embodiment of the invention.

S302~S314‧‧‧ method steps for adapting the brightness of the screen according to the ambient light source according to an embodiment of the invention

Claims (13)

A method for adjusting brightness of a screen according to an ambient light source adaptability is applicable to an electronic device including a light sensor and a screen, the method comprising the steps of: obtaining the light sensor corresponding to a current brightness value of one of the screens An illuminance interval, wherein a range of values of the illuminance value detected by the photo sensor is divided into a plurality of consecutive illuminance intervals, and the illuminance intervals respectively correspond to a plurality of screen brightness values; The detector detects the current illuminance value of the outside world; compares the illuminance value with the illuminance interval, and adjusts a screen brightness value of the screen; when the illuminance value is higher than a upper limit value of the illuminance interval by a preset value Adjusting a current brightness value of the screen to a first target brightness value of a higher first order; and adjusting the current brightness value of the screen when the illuminance value is lower than the lower limit value of the illuminance interval by the preset value A second target brightness value of the lower order. The method for adjusting the brightness of the screen according to the ambient light source according to the first aspect of the patent application includes: recording the numerical range of each of the illumination intervals and the corresponding brightness value of the screen in a look-up table (Look-Up Table, LUT). The method for adjusting the brightness of the screen according to the ambient light source according to the second aspect of the patent application, wherein the step of adjusting the brightness value of the screen of the screen comprises: Querying the lookup table to find a screen brightness value higher than the current brightness value as the first target brightness value, or finding a screen brightness value lower than the current brightness value as the second target brightness value . The method for adjusting the brightness of the screen according to the ambient light source according to the first aspect of the patent application, wherein comparing the illuminance value and the illuminance interval, the step of adjusting the brightness value of the screen according to the method further comprises: when the illuminance value is When the upper limit value of the illumination interval is added to the preset value and the lower limit value of the illumination interval minus the value range of the preset value, the original screen brightness value of the screen is maintained. The method for adjusting the brightness of the screen according to the ambient light source according to the first aspect of the patent application, wherein when the illuminance value is higher than the upper limit value of the illuminance interval, the method further includes: a predetermined time, using the photo sensor to detect an external illuminance value, and determining whether the illuminance values are higher than the upper limit value of the illuminance interval; the cumulative ratio is the upper limit value of the illuminance interval a number of the illuminance values higher than the preset value; and when the accumulated number exceeds a threshold value, adjusting the current brightness value of the screen to the first target brightness value of the first order. The method for adjusting the brightness of the screen according to the ambient light source according to the first aspect of the patent application, wherein when the illuminance value is lower than the lower limit value of the illuminance interval, the method further comprises: every other one The predetermined time, the light sensor is used to detect the ambient light value, and it is determined whether the light value is lower than the lower limit of the illumination interval. And outputting the preset value; accumulating a number of the illuminance values lower than the lower limit value of the illuminance interval by the preset value; and adjusting the current brightness of the screen when the accumulated number exceeds a threshold value The value is the second target luminance value of the lower first order. The method for adjusting the brightness of the screen according to the ambient light source according to the first aspect of the patent application, wherein after the step of adjusting the brightness value of the screen of the screen, the method further comprises: reusing the light after the predetermined time interval The sensor detects the illuminance value of the outside world, and re-measures the illuminance value and the adjustment step of the brightness value of the screen. An electronic device includes: a screen; a light sensor that detects an external illuminance value, wherein the photo sensor detects a range of values of the illuminance value as a continuous plurality of illuminance intervals, and the The illumination intervals respectively correspond to the plurality of screen brightness values of the screen; a storage medium stores a lookup table, wherein the lookup table records the numerical range of each of the illumination intervals and the corresponding screen brightness value; and a controller, Connecting the screen, the light sensor and the storage medium, obtaining an illuminance interval corresponding to a current brightness value of the screen and the illuminance value detected by the light sensor, and comparing the illuminance value and the illuminance interval Adjusting the screen brightness value of the screen, wherein the illuminance value is higher than the upper limit value of the illuminance interval by a preset Adjusting a current brightness value of the screen to a first target brightness value of a higher first order; and adjusting the current brightness value of the screen when the illuminance value is lower than the lower limit value of the illuminance interval by the preset value A second target brightness value that is lower than the first order. The electronic device of claim 8, wherein the controller comprises querying the lookup table in the storage medium to find a screen brightness value higher than the current brightness value as the first target brightness value, Or find a screen brightness value that is one step lower than the current brightness value as the second target brightness value. The electronic device of claim 8, wherein the controller further reduces the illuminance value by the upper limit value of the illuminance interval plus the preset value and the lower limit value of the illuminance interval. The original screen brightness value of the screen is maintained when the value range of the preset value is within the range. The electronic device of claim 8, wherein the controller receives the photometric value of the external light sensor every other predetermined time and accumulates the upper limit value of the illumination interval higher than the upper limit value of the illumination interval. a predetermined number of the illuminance values, and when the accumulated number exceeds a threshold, adjusting the current brightness value of the screen to the first target brightness value of the first order. The electronic device of claim 8, wherein the controller receives the light sensor to detect an external illuminance value every other predetermined time, and accumulates the lower limit than the lower limit of the illuminance interval. Set a number of the illuminance values of the value, and when the accumulated number exceeds a threshold And adjusting the current brightness value of the screen to the second target brightness value of the first order. The electronic device of claim 8, wherein the controller uses the photo sensor to detect an external illuminance value every other predetermined time, and re-measures the illuminance value and adjusts the brightness value of the screen. .