TWI392359B - Electronic apparatus and method for controlling backlight of the same - Google Patents

Description

Electronic device and background light control method thereof

The present invention relates to an electronic device, and more particularly to an electronic device capable of controlling display brightness of background light and a method of controlling the backlight thereof.

A variety of electronic devices, such as cell phones, personal digital assistants (PDAs), audio/video players, etc., usually have a display for displaying relevant information to the user.

Generally, in these electronic devices, the power consumption of the display screen is relatively large. Therefore, in order to save power consumption and prolong the use time of the electronic device after one charge, people often set the display screen to a timed off mode. For example, in the working state, if a message input by the user is detected, the display is kept on for a period of time; if the user does not detect the operation of the electronic device within the predetermined time, the display will be displayed. The screen is turned off and the display is turned on again until the user's operation message is received again.

Light Emitting Diodes (LEDs) are commonly used in electronic devices as a background light source for display screens. However, when viewing the display screen in the sun, since the luminance of the light-emitting diode is too small compared to the brightness of the sunlight, there may be a case where the image displayed on the display screen is dark and the user cannot see the screen content.

In view of this, it is necessary to provide an electronic device having sufficient display brightness.

In addition, it is also necessary to provide a backlight control method that can provide an electronic device with sufficient display brightness.

An electronic device comprising a display screen for displaying a message to a user, the display screen comprising a display panel and a backlight system; the backlight system comprising: a self-light source and a light collecting device, the collecting device is configured to collect ambient light, the set The ambient light collected by the optical device and the light emitted by the self-light source are integrated into the backlight of the display screen; the electronic device further includes: a light detecting device for detecting the brightness of the ambient light and generating a brightness detecting signal; a light control device, configured to send a background light control signal to the backlight system according to the brightness detection signal, to adjust the light source according to the ambient light collected by the light collection device, thereby adjusting the ambient light in the background light provided by the backlight system The proportion of light emitted by its own light source.

A backlight control method for an electronic device, comprising: collecting ambient light; introducing the collected ambient light into a backlight system of the electronic device; detecting brightness of the ambient light to generate a brightness detection signal; adjusting the brightness according to the brightness detection signal The light source further adjusts the ratio of ambient light in the background light of the electronic device to light emitted by the own light source.

Using the above-mentioned electronic device and its backlight control method, by collecting ambient light as a supplement of the light emitted by the self-light source, and collecting the collected environment Light acts as the backlight of the electronic device, so that when the brightness of the ambient light is high, the display brightness of the display screen can also be increased to a level equivalent to the ambient light brightness, providing sufficient display brightness.

Please refer to FIG. 1 , which is a schematic structural diagram of an electronic device according to a preferred embodiment. The electronic device 100 includes a display screen 102, a display driving device 104, a light detecting device 108, a central processing unit 110, and a backlight control device 112.

The display screen 102 is configured to output a display message of the electronic device 100 to the user, and the display message includes multimedia messages such as text, pictures, audio/video, and operation information of the user.

The display screen 102 includes a display panel 122 and a backlight system 124. The display panel 122 is configured to control the opening and closing of each pixel point according to the driving signal, so that the background light emitted by the backlight system 124 is selectively passed through the respective pixel points, thereby forming a display image.

The backlight system 124 includes a light collecting device 132 and a self light source 134. The light collecting means 132 is used to collect ambient light from the outside, and the collected ambient light is used as a supplement to the light emitted by the self-light source 134 in the backlight system 124. The backlight system 124 integrates the ambient light collected by the light collecting device 132 with the light emitted by the self-light source 134 to form a background light of the display screen 102.

The display driving device 104 is configured to convert a message to be displayed to the user by the electronic device 100 into a display driving signal, and provide the display driving signal to the display panel 1022 of the display screen 102, so that the display screen 102 can be used according to the display driving signal. Reproduce the message to be displayed.

The light detecting device 106 is configured to detect the brightness of the ambient light and generate a brightness detecting signal, which is transmitted to the central processing unit 108.

The central processing unit 108 is configured to generate a background light compensation command according to the brightness detection signal transmitted by the light detecting device 106 to determine whether the ambient light collected by the light collecting device 132 is used in the backlight system 124 to compensate the light emitted by the light source 134. And the proportion of compensation, etc. The central processing unit 108 is further configured to provide the display driving device 104 with a message to be displayed on the display screen 102 by the electronic device 100, the message being converted by the display driving device 104 into a display driving signal.

The backlight control device 110 is configured to send a backlight control signal according to the backlight compensation command generated by the central processing unit 108, where the backlight control signal is used to control the backlight provided by the backlight system 124 of the display screen 102. The ratio of the light emitted by the light source 134 to the ambient light collected by the light collecting means 132.

The brightness of the ambient light collected by the light collecting means 132 varies with changes in external light. The backlight system 124 can adjust the ratio of the light emitted by the light source 134 to the ambient light collected by the light collecting device 132 by adjusting the brightness of the light source 134 therein. As shown in Table 1: As shown in Table 1, when the brightness of the ambient light is high, the brightness of the light source 134 in the backlight system 124 can be lowered, so that the proportion of the ambient light in the background light is increased, and the light emitted by the light source 134 is increased. The proportion of the background light is reduced; when the brightness of the ambient light is low, the brightness of the light source 134 in the backlight system 124 can be increased, so that the proportion of the light emitted by the light source 134 in the background light is increased. This adjustment mode can dynamically adjust the luminance of the light source 134 according to the ambient brightness, and thus the utilization efficiency of the self-light source 134 in the backlight system 124 can be improved.

In other embodiments, the backlight system 124 can also adjust the light emitted by the light source 34 and the ambient light collected by the light collecting device 132 by adjusting the amount of light that the light emitted by the light source 134 is integrated into the background light. The proportion of the background light of 102, for example, by means of grating adjustment.

By the above adjustment, the light emitted by the self-light source 134 of the electronic device 100 can be added to the ambient light collected by the light collecting device 132 as the backlight of the display screen 102 to ensure the display screen in any environment. The brightness of the backlight provided by the backlight system 124 of 102 is not lower than the ambient brightness, so that the problem of low brightness of the display screen does not occur.

2 is a schematic structural view of a display screen 102 according to a preferred embodiment. The display screen 102 includes a display panel 122 and a backlight system 124. The backlight system 124 includes a self-light source 134, a lighting panel 524, and a light guide. Plate 526, diffusion plate 528, and the like.

The self-light source 134 is used to provide a portion of the background light required for display of the display screen. The self-light source 134 may be a Cold Cathode Fluorescent Lamp (CCFL) or a Light Emitting Diode (LED).

The lighting panel 524 is used to collect ambient light, and the collected ambient light is supplemented by the light emitted by the self-light source 134 and integrated with the light emitted by the self-light source 134 to provide the background required for the display of the display screen 102. Light. The lighting panel 524 can be used as a preferred embodiment of the light collecting device 132 shown in FIG.

The light guide plate 526 is configured to uniformly diffuse the light emitted by the light source 134 and the ambient light beam collected by the lighting plate 524 to the back area of the display panel 122 such that the light beams are distributed in a panel shape behind the display panel 122 to become a surface light source.

The diffuser plate 528 is used to diffusely reflect the panel-shaped light converted by the light guide plate 526 such that the brightness of the background light remains uniform throughout the area behind the display panel 122.

As shown in FIG. 3, it is a schematic structural view of the central processing unit 108 shown in FIG. The central processing unit 108 includes an image signal subunit 210 and a compensation signal subunit 220. The image signal sub-unit 210 is configured to provide the display driving device 104 with a message to be displayed on the display screen 102. The message is converted by the display driving device 104 into a display driving signal and sent to the display panel 122 of the display screen 102. The compensation signal sub-unit 220 is configured to generate a background light compensation command according to the brightness detection signal transmitted by the light detecting device 106, and The background light compensation command is sent to the backlight control device 110.

The image signal subunit 210 includes an image signal generation module 212 and an image signal transmission module 214. The image signal generating module 212 is configured to generate an image signal to be displayed, and the image signal is sent to the display driving device 104 by the image signal sending module 214.

The compensation signal sub-unit 220 includes a signal receiving module 222, a correspondence relationship table 224, an inquiry module 226, and a compensation command transmitting module 228.

The signal receiving module 222 is configured to receive the brightness detecting signal transmitted by the light detecting device 106 and forward the brightness detecting signal to the query module 226.

The corresponding relationship table 224 stores a preset background light compensation ratio corresponding to the brightness of the ambient light. According to the query command sent by the query module 226, the correspondence table 224 returns a corresponding query result to the query module 226, the query. The result indicates the background light compensation ratio corresponding to the brightness of the ambient light.

The query module 226 is configured to send a query instruction to the correspondence table 224 according to the received brightness detection signal to query the correspondence relationship table 224 for the background light compensation ratio corresponding to the brightness of the ambient light. After the corresponding relationship table 224 returns the corresponding query result according to the query instruction, the query module 226 generates a corresponding background light compensation command according to the query result, and transmits the background light compensation command to the compensation command sending module 228.

The compensation command sending module 228 is configured to send the background light compensation command generated by the query module 224 to the backlight control device 110, so that the backlight control device 110 sends the background to the backlight system 124 of the display screen 102 according to the backlight compensation command. Light control signal to control the backlight system of display screen 102 The ratio of the light emitted by the self-light source 134 to the ambient light collected by the light collecting means 132 in the background light provided by 124.

As shown in FIG. 4, it is a schematic diagram showing the relationship between the ambient brightness of a preferred embodiment and the proportion of light emitted by the self-light source 134 in the backlight provided in the backlight system 124 of the display screen 102. In the background light of the display screen 102, the ratio of the ambient light to the light emitted by the self-light source 134 exhibits a tendency to decelerate. However, as a whole, the brightness of the background light of the display screen 102 always increases as the brightness of the ambient light increases to ensure that a display image of sufficient brightness can be obtained in various natural light environments.

When the ambient brightness is high, the brightness of the light emitted by the self-light source 134 in the backlight system 124 is much less than the brightness of the ambient light. At this time, in the background light provided by the backlight system 124, the proportion of light emitted by the self-light source 134 is small, and the majority of the ambient light collected by the light collecting device 132 is occupied. The higher the ambient brightness, the smaller the proportion of light emitted by the self-light source 134; when the ambient brightness is high to a certain extent, the ambient light collected by the light collecting device 132 may be used directly as the background. Light.

When the ambient brightness is low, the brightness of the light emitted by the self-light source 134 in the backlight system 124 is comparable to the brightness of the ambient light. At this time, since the ambient light collected by the light collecting device 132 can provide a limited brightness, the proportion of the light emitted by the light source 134 must be increased to enable the brightness of the background light of the display screen 102 to be sufficiently distinguishable by the user. When in a dark environment, since the brightness of the ambient light is near zero, almost all of the backlight of the display screen 102 needs to be provided by its own light source 134.

As shown in FIG. 5, it is a flowchart of a method for controlling backlight of an electronic device according to a preferred embodiment. The flow of the background light control method will be described below with reference to the configuration of the electronic device shown in FIGS. 1 and 3.

Step 402: After the system initialization is completed, the backlight control device 110 sends an initial backlight control signal to set the background light of the display screen 102 as the initial brightness.

Step 404, the light detecting device 106 detects the brightness of the ambient light, generates a brightness detecting signal, and sends the brightness detecting signal to the signal receiving module 222 of the central processing unit 108.

Step 406, the signal receiving module 222 receives the brightness detection signal, and forwards the brightness detection signal to the query module 226.

In step 408, the query module 226 sends a corresponding query command to the correspondence table 224 according to the received brightness detection signal to query the background light compensation ratio corresponding to the brightness of the ambient light.

In step 410, the correspondence table 224 returns a corresponding query result to the query module 226 in response to the query instruction, and the query result indicates the background light compensation ratio corresponding to the brightness of the ambient light.

Step 412: The query module 226 generates a corresponding background light compensation command according to the query result, and sends the background light compensation command to the compensation command sending module 228.

In step 414, the compensation command sending module 228 sends the background light compensation command sent by the query module 226 to the backlight control device 110.

Step 416, the backlight control device 110 according to the background light compensation command A corresponding backlight control signal is generated and transmitted to the backlight system 124 of the display screen 102.

At step 418, the light collecting device 132 of the backlight system 124 collects ambient light. The light collecting means 132 may be in the form of a lighting panel 524 as shown in FIG.

In step 420, the light collecting device 132 introduces the collected ambient light into the background light provided by the backlight system 124.

Step 422: After receiving the background light control signal, the backlight system 124 controls the ratio of the light emitted by the light source 134 and the ambient light collected by the light collecting device 132 in the background light provided by the backlight system 124 according to the background light control signal.

In step 422, the backlight system 124 of the display screen 102 can adjust the ratio by adjusting the brightness of the light emitted by the self-light source 134: when the brightness of the ambient light is high, the brightness of the light source 134 can be lowered. Therefore, the proportion of ambient light in the background light is increased, and the proportion of the light emitted by the self-light source 134 in the background light is decreased; when the brightness of the ambient light is low, the illumination of the self-light source 134 in the backlight system 1024 can be The brightness is increased so that the proportion of light emitted by the self-light source 134 in the background light is increased.

In other embodiments, the backlight system 124 can also adjust the light emitted by the light source 134 and the ambient light collected by the light collecting device 132 by adjusting the amount of light that the light emitted by the light source 134 is integrated into the background light. The proportion of the background light of 102, for example, by means of grating adjustment.

By using the above electronic device and its background light control method, the ambient light of the outside world can be dynamically used as compensation, and the self-light source in the backlight system is solved. Insufficient brightness under strong lighting conditions. In addition, the electronic device and the background light control method thereof use the light detecting device to detect the brightness of the ambient light, and instantly adjust the brightness of the self-light source in the backlight system of the electronic device, and reduce the light emission of the self-light source when the brightness of the ambient light is high. Brightness saves power.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above is only a preferred embodiment of the present invention, and those skilled in the art will be able to include the equivalent modifications or variations in the spirit of the present invention.

100‧‧‧Electronic equipment

102‧‧‧ display

104‧‧‧Display drive

108‧‧‧Light detector

110‧‧‧Central Processing Unit

112‧‧‧Backlight control device

122‧‧‧ display panel

124‧‧‧Backlight system

132‧‧‧Light collecting device

134‧‧‧Self source

524‧‧‧Lighting board

526‧‧‧Light guide plate

528‧‧‧Diffuser

210‧‧‧Image Signal Subunit

220‧‧‧compensation signal subunit

212‧‧‧Image Signal Generation Module

214‧‧‧Image signal sending module

222‧‧‧Signal receiving module

224‧‧‧ correspondence table

226‧‧‧Query Module

228‧‧‧Compensation Command Sending Module

402~422‧‧‧Backlight control method flow

FIG. 1 is a schematic structural view of an electronic device according to a preferred embodiment.

2 is a schematic structural view of a display screen according to a preferred embodiment.

3 is a schematic structural view of a central processing unit of a preferred embodiment.

4 is a schematic diagram showing the relationship between the ambient brightness of a preferred embodiment and the proportion of light emitted by the self-light source in the backlight system of the display screen.

FIG. 5 is a flow chart of a method for controlling backlight of a display screen of an electronic device according to a preferred embodiment.

100‧‧‧Electronic equipment

102‧‧‧ display

104‧‧‧Display drive

108‧‧‧Light detector

110‧‧‧Central Processing Unit

112‧‧‧Backlight control device

122‧‧‧ display panel

124‧‧‧Backlight system

132‧‧‧Light collecting device

134‧‧‧Self source

Claims (10)

An electronic device comprising a display screen for displaying a message to a user, the display screen comprising a display panel and a backlight system; wherein the backlight system comprises: a self-light source and a light collecting device, the collecting device is used for collecting an environment Light, the ambient light collected by the light collecting device and the light emitted by the self light source are integrated into the backlight of the display screen; the electronic device further comprises: a light detecting device for detecting the brightness of the ambient light and generating the brightness a detection signal; a backlight control device, configured to send a backlight control signal to the backlight system according to the brightness detection signal, to adjust the light source according to the ambient light collected by the light collection device, thereby adjusting the backlight provided by the backlight system The ratio of ambient light to light emitted by its own source. The electronic device of claim 1, wherein the electronic device further comprises a central processing unit, the central processing unit comprising: an image signal sub-module for providing the display panel with a message to be displayed; The signal subunit is configured to receive the brightness detection signal, and issue a background light compensation command according to the brightness detection signal; the background light control device sends the background light control signal according to the background light compensation command. The electronic device of claim 1, wherein the electronic device further comprises a correspondence table and a query module; wherein the correspondence table stores ambient light in the background light corresponding to the brightness of the ambient light. a ratio of the light emitted by the light source; the query module is configured to send a query instruction to the correspondence table according to the brightness detection signal; the correspondence table returns a query result to the query module according to the query instruction, where the query result indicates In the background The ratio of ambient light in the light to the light emitted by its own source. The electronic device of claim 1, wherein the backlight system of the display screen adjusts the ratio of the ambient light in the backlight of the display screen to the light emitted by the light source by adjusting the brightness of the light source of the display. . The electronic device of claim 1, wherein: the backlight system of the display screen adjusts the ambient light and the self-light source in the background light of the display screen by adjusting the amount of light emitted by the self-light source into the background light. The proportion of light emitted. A backlight control method for an electronic device, comprising: collecting ambient light; introducing the collected ambient light into a backlight system of the electronic device; detecting brightness of the ambient light to generate a brightness detection signal; adjusting the brightness according to the brightness detection signal The light source further adjusts the ratio of ambient light in the background light of the electronic device to light emitted by the own light source. The background light control method of the electronic device of claim 6, wherein the method further comprises: receiving the brightness detection signal; issuing a query instruction according to the brightness detection signal to query the ratio corresponding to the brightness of the environment; The result of the query includes the ratio of the ambient light in the background light of the electronic device to the light emitted by the self-light source; and the ambient light in the background light of the electronic device and the light emitted by the self-light source are adjusted according to the query result. proportion. The background light control method of the electronic device of claim 7, wherein the method further comprises: emitting a backlight compensation command according to the query result; A background light control signal is generated according to the background light compensation command to adjust a ratio of ambient light in the backlight of the electronic device to light emitted by the light source. The backlight control method for an electronic device according to claim 6, wherein the method further comprises: adjusting a brightness of the light source of the self-light source to adjust ambient light in the backlight of the electronic device and light emitted by the light source of the electronic device; proportion. The backlight control method of the electronic device of claim 6, wherein the method further comprises: adjusting the amount of light emitted by the self-light source into the background light to adjust ambient light in the backlight of the electronic device The proportion of light emitted by the light source.