TWI502576B - Electronic apparatus and method for controlling brightness for a display - Google Patents

Description

Electronic device and display brightness control method

The present invention relates to an electronic device and display brightness control method, and more particularly to a display brightness control method according to ambient brightness.

The feature of the mobile phone is that it allows the user to carry it with him or her, so the use environment includes a darker room and a brighter outdoor. Outdoors, the display of the mobile phone may not be clear because the surrounding environment is too bright.

The user interface of the general mobile phone has the function of allowing the user to adjust the brightness of the display, but the power consumption of the high brightness display is much larger than that of the general brightness display, and the use environment of the mobile phone is not always bright. When the user sets the display to a high brightness in a bright environment and later enters a relatively dark environment, the high brightness of the display causes unnecessary high power consumption and shortens the use time of the mobile phone.

The invention provides an electronic device and a display brightness control method, which can automatically adjust the brightness of the display according to the ambient brightness, so as to balance the image visibility of the display. And the power saving needs of electronic devices.

The electronic device of the present invention includes a display, a photo sensor, and a controller. The display shows an image. The light sensor measures the ambient brightness accepted by the display. The controller is coupled to the display and the light sensor. The hardware brightness range of the display is divided into segments, the first segment including the hardware minimum brightness of the display, and the last segment including the highest hardware brightness of the display. The controller limits the display brightness of the display to one of the plurality of sections according to the ambient brightness, and the controller allows the user of the electronic device to set the display brightness only when the display brightness is limited to the first section.

The display brightness control method of the present invention is performed by the above electronic device, comprising the steps of: measuring the ambient brightness accepted by the display, wherein the hard brightness range of the display is divided into a plurality of segments, and the first segment includes the hardware of the display Minimum brightness, the last segment includes the highest brightness of the display hardware; the display brightness of the display is limited to one of the plurality of segments according to the ambient brightness; and the electronic is allowed only when the display brightness is limited to the first segment The user of the device sets the display brightness.

The above-mentioned electronic device and display brightness control method can automatically improve the visibility of the image of the display in a high-brightness environment, and can also automatically reduce the display brightness of the display in a low-brightness environment to reduce power consumption.

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

100‧‧‧Electronic devices

110‧‧‧ display

120‧‧‧Light sensor

130‧‧‧ Controller

210~250‧‧‧ method steps

300, 400‧‧‧ hardware brightness range of the display

310, 320, 410, 422, 424‧‧‧ sections of the hardware brightness range of the display

1 is a schematic diagram of an electronic device in accordance with an embodiment of the present invention.

2 is a flow chart of a method for controlling brightness of a display according to an embodiment of the invention.

3 is a schematic diagram of a hardware brightness range of a display in accordance with an embodiment of the present invention.

4 is a schematic diagram of a hardware brightness range of a display in accordance with another embodiment of the present invention.

1 is a schematic diagram of an electronic device 100 in accordance with an embodiment of the present invention. The electronic device 100 can be any electronic device including a display, such as a smart phone, a personal digital assistant (PDA), a digital camera, a tablet computer, a notebook computer, a desktop computer, a computer monitor, a television, And so on. The electronic device 100 includes a display 110, a light sensor 120, and a controller 130. The display 110 is used to display an image. The light sensor 120 is used to measure the ambient brightness V _AB accepted by the display 110. The controller 130 is coupled to the display 110 and the photo sensor 120. The controller 130 can adjust the display brightness V _{D of the} display 110 according to the ambient brightness V _AB and limit the range of the display brightness V _D .

2 is a flow chart of a method for controlling brightness of a display according to an embodiment of the invention. The method of FIG. 2 can be performed by electronic device 100. At step 210, photosensor 120 measures ambient brightness V _AB accepted by display 110. At step 220, the controller 130 checks if the ambient brightness V _AB is less than a preset value T ₁ . When the ambient brightness V _{AB is} less than the preset value T ₁ , the controller 130 limits the display brightness V _{D of the} display 110 to the low brightness section in step 230. When the ambient brightness V _{AB is} greater than or equal to the preset value T ₁ , the controller 130 limits the display brightness V _{D of the} display 110 to the high brightness section at step 240.

3 and 4 illustrate two examples of steps 230 and 240. 3 is a schematic diagram of a hardware brightness range 300 of display 110, in accordance with an embodiment of the present invention. The hardware brightness range 300 covers the minimum and maximum brightness that can be achieved by the hardware of the display 110. In the hardware brightness range 300, the left side indicates that the brightness is low, and the right side indicates that the brightness is high, so the leftmost side of the hardware brightness range 300 is the hardware minimum brightness of the display 110, and the rightmost side of the hardware brightness range 300 is the display 110. The highest brightness of the hardware. As shown in FIG. 3, the hardware brightness range 300 of display 110 is divided into two segments 310 and 320. Segment 310 includes the lowest hardware brightness of display 110, while segment 320 includes the highest hardware brightness of display 110. The brightness of section 320 is higher than section 310.

When the ambient brightness V _{AB is} less than the preset value T ₁ , the low brightness segment of step 230 is the segment 310. In this case, the controller 130 allows the user of the electronic device 100 to set the display brightness V _{D of the} display 110 in the section 310, and the controller 130 limits the display brightness V _D to the section 310. That is, the user cannot set the display brightness V _D to exceed the section 310.

When the ambient brightness V _{AB is} greater than or equal to the preset value T ₁ , the high brightness segment of step 240 is the segment 320. In this case, the controller 130 limits the display brightness V _D to the section 320, and the controller 130 does not allow the user of the electronic device 100 to set the display brightness V _{D of the} display 110 by itself. The controller 130 can set the display brightness V _D according to the ambient brightness V _AB in the section 320 such that the display brightness V _D is proportional to the ambient brightness V _AB .

In summary, when the ambient brightness V _{AB is} low, the user can arbitrarily set the display brightness V _D in the section 310, but the user cannot set the display brightness V _D to the higher brightness section 320. At this time, the display brightness V _D that the user can set cannot reach the highest brightness of the display 110. When the ambient brightness V _{AB is} high, the controller 130 opens the higher brightness section 320. The display brightness V _D at this time is not allowed to be set by the user, but is automatically set by the controller 130 according to the ambient brightness V _AB . At this time, the display brightness V _D can reach the highest brightness of the display 110.

4 is a schematic illustration of a hardware brightness range 400 of display 110 in accordance with another embodiment of the present invention. In the hardware brightness range 400, the left side indicates lower brightness and the right side indicates higher brightness, so the leftmost side of the hard brightness range 400 is the hardest minimum brightness of the display 110, and the far right is the hardest highest brightness of the display 110. The hardware brightness range 400 is divided into three segments 410, 422, and 424. Where segment 410 includes the lowest hardware brightness of display 110 and segment 424 includes the highest hardware brightness of display 110. The brightness of section 422 is higher than section 410, and the brightness of section 424 is higher than section 422.

When the ambient brightness V _{AB is} less than the preset value T ₁ , the low brightness segment of step 230 is the segment 410. In this case, the controller 130 allows the user of the electronic device 100 to set the display brightness V _{D of the} display 110 in the section 410, and the controller 130 limits the display brightness V _D to the section 410. That is, the user cannot set the display brightness V _D beyond the section 410.

When the ambient brightness V _{AB is} greater than or equal to the preset value T1 and less than another preset value T _1.1 , the high brightness segment of step 240 is the segment 422. In this case, the controller 130 limits the display brightness V _D to the section 422, and the controller 130 does not allow the user of the electronic device 100 to set the display brightness V _{D of the} display 110 by itself. The controller 130 can set the display brightness V _D according to the ambient brightness V _AB in the section 422 such that the display brightness V _D is proportional to the ambient brightness V _AB .

When the ambient brightness V _{AB is} greater than the preset value T _1.1 , the high brightness segment of step 240 is the segment 424. In this case, the controller 130 limits the display brightness V _D to the section 424, and the controller 130 does not allow the user of the electronic device 100 to set the display brightness V _{D of the} display 110 by itself. The controller 130 can set the display brightness V _D in the section 424 according to the ambient brightness V _AB such that the display brightness V _D is proportional to the ambient brightness V _AB .

In summary, when the ambient brightness V _{AB is} low, the user can arbitrarily set the display brightness V _D in the section 410, but the user cannot set the display brightness V _D to the higher brightness sections 422 and 424. The display brightness V _D that the user can set at this time cannot reach the highest brightness of the display 110. When the ambient brightness V _{AB is} high, the controller 130 opens the higher brightness section 422 or / and 424. The display brightness V _D at this time does not allow the user to set it himself, but is controlled by the controller 130 according to the ambient brightness V _{AB .} The setting is automatically set, and the display brightness V _D at this time can reach the highest brightness of the display 110. That is, the controller 130 only in the display luminance is limited to V _D section 410 allows a user to set the display luminance when V _D, the user is not allowed in the other sections set display brightness V _D.

The embodiment of FIG. 3 has only one high luminance section 320, and the embodiment of FIG. 4 has two high luminance sections 422 and 424. The invention does not limit the number of high brightness segments. Therefore, in other embodiments of the invention, there may be more high brightness segments.

Returning to Figure 2, after steps 230 and 240, controller 130 may check in step 245 whether ambient brightness V _AB is greater than another preset value T ₂ . If the ambient brightness V _{AB is} less than or equal to the preset value T ₂ , the flow ends here. If the ambient brightness V _{AB is} greater than the preset value T ₂ , the controller 130 adjusts at least one characteristic parameter of the image displayed by the display 110 according to the ambient brightness V _AB in step 250 to improve the image visibility of the display 110. The above characteristic parameters may include one or more of brightness, contrast, saturation, clarity, and sharpness of the above image. Each of the above characteristic parameters can be set to be proportional to the ambient brightness V _AB . Since the relationship between the feature parameter and the ambient brightness V _AB can be predefined, the controller 130 can obtain the value of the above characteristic parameter according to the ambient brightness V _{AB by} calculation or table lookup.

The preset value T ₂ may be one of preset values for dividing the display brightness section, or another independent preset value. For example, in the embodiment of FIG. 3, the preset value T ₂ may be equal to the preset value T ₁ , or less than the preset value T ₁ , or greater than the preset value T ₁ .

Similarly, in the embodiment of FIG. 4, the preset value T ₂ may be equal to the preset value T ₁ or T _1.1 , or less than the preset value T ₁ , or between T ₁ and T _1.1 , or greater than the preset value. T _1.1 . If the preset value T _{2 is} set to T ₁ , the feature parameter adjustment is initiated only when the display brightness V _{D of the} display 110 enters the section 422. If the preset value T _{2 is} set to T _1.1 , the feature parameter adjustment is initiated only when the display brightness V _{D of the} display 110 enters the section 424. If the preset value T _{2 is} set to be smaller than the preset value T ₁ , when the ambient brightness V _{AB is} increased, the feature parameter adjustment is started first, and then the high brightness section 422 or / and 424 is opened. If the preset value T _{2 is} set between the preset values T ₁ and T _1.1 , when the ambient brightness V _AB increases, the high-brightness section 422 is first opened, and then the feature parameter adjustment is started. If the preset value T _{2 is} set to be greater than the preset value T _1.1 , when the ambient brightness V _{AB is} increased, the high-brightness section 422 is first opened, and then the high-brightness section 424 is opened, and then the feature parameter adjustment is started.

In the method flow of FIG. 2, the controller 130 executes steps 210-240 and then performs steps 245-250. That is, the controller 130 first decides which brightness section the display brightness V _{D is} limited to, and then checks if the above-described characteristic parameter is adjusted. In another embodiment, the order of execution of steps 210-240 and steps 245-250 can be interchanged. That is, the controller 130 may first check whether the above characteristic parameter is adjusted, and then decide which brightness segment to limit the display brightness V _D to. Alternatively, in another embodiment, steps 245 and 250 may be omitted.

In summary, the present invention provides an electronic device and a display brightness control method, which can automatically adjust the brightness of the display according to the ambient brightness. In a low-light environment, the present invention automatically limits the upper limit of the brightness of the display to avoid excessively high brightness of the display by the user, resulting in unnecessary power consumption. In a high-brightness environment, the present invention can automatically open a higher display brightness range and automatically increase the display brightness of the display, and automatically adjust the image's characteristic parameters to improve the visibility of the screen image of the display of the electronic device. Therefore, the present invention can take into account the image visibility of the display of the electronic device And the power saving needs of electronic devices.

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

210~250‧‧‧ method steps

Claims (16)

An electronic device comprising: a display for displaying an image; a light sensor for measuring ambient brightness received by the display; and a controller coupled to the display and the light sensor, wherein the display is hard The body brightness range is divided into a plurality of segments, a first one of the plurality of segments includes a hardware minimum brightness of the display, and a last one of the plurality of segments includes a hardware maximum brightness of the display The controller limits the display brightness of the display to one of the plurality of segments according to the ambient brightness, and the controller allows the use of the electronic device only when the display brightness is limited to the first segment Set the display brightness. The electronic device of claim 1, wherein when the ambient brightness is less than a first preset value, the controller limits the display brightness to the first segment; when the ambient brightness is greater than or equal to The first predetermined value, the controller limits the display brightness to one of the remaining plurality of segments, and sets the display brightness such that the display brightness is proportional to the ambient brightness. The electronic device of claim 1, wherein the controller adjusts at least one characteristic parameter of the image according to the ambient brightness. The electronic device of claim 3, wherein the at least one characteristic parameter comprises at least one of brightness, contrast, vividness, sharpness, and sharpness of the image. An electronic device according to claim 3, wherein each of the above The parameters are all proportional to the brightness of the environment. The electronic device of claim 3, wherein the controller adjusts the at least one characteristic parameter according to the ambient brightness only when the ambient brightness is greater than a second predetermined value. The electronic device of claim 6, wherein the controller first determines which display segment to limit the display brightness to, and then checks whether the at least one feature parameter is adjusted. The electronic device of claim 6, wherein the controller first checks whether the at least one characteristic parameter is adjusted, and then determines which of the above segments to limit the display brightness to. A display brightness control method is performed by an electronic device, the electronic device includes a display, the display displays an image, and the display brightness control method comprises: measuring an ambient brightness received by the display, wherein the display has a hardware brightness range Dividing into a plurality of segments, a first segment of the plurality of segments comprising a hardware minimum brightness of the display, a last one of the plurality of segments comprising a hardware maximum brightness of the display; Ambient brightness limits the display brightness of the display to one of the plurality of segments; and allows the user of the electronic device to set the display brightness only when the display brightness is limited to the first segment. The brightness control method of the display as described in claim 9 of the patent application, The method includes: limiting the display brightness to the first segment when the ambient brightness is less than a first preset value; and limiting the display brightness to when the ambient brightness is greater than or equal to the first preset value And one of the remaining plurality of segments, and setting the display brightness such that the display brightness is proportional to the ambient brightness. The display brightness control method of claim 9, further comprising: adjusting at least one characteristic parameter of the image according to the ambient brightness. The display brightness control method of claim 11, wherein the at least one characteristic parameter includes at least one of brightness, contrast, vividness, sharpness, and sharpness of the image. The display brightness control method of claim 11, wherein each of the above characteristic parameters is proportional to the ambient brightness. The display brightness control method of claim 11, further comprising: adjusting the at least one characteristic parameter according to the ambient brightness only when the ambient brightness is greater than a second preset value. The display brightness control method of claim 14, further comprising: first determining which display segment is to be limited to, and then checking whether the at least one feature parameter is adjusted. The display brightness control method of claim 14, further comprising: first checking whether the at least one characteristic parameter is adjusted, and then determining which of the above segments is limited to the display brightness.