WO2009074106A1

WO2009074106A1 - Method, device and terminal for regulating brightness of lcd on terminal equipment

Info

Publication number: WO2009074106A1
Application number: PCT/CN2008/073346
Authority: WO
Inventors: Shuxin Zhou
Original assignee: Shenzhen Huawei Communication Technologies Co., Ltd.
Priority date: 2007-12-07
Filing date: 2008-12-05
Publication date: 2009-06-18
Also published as: CN101183517A

Abstract

There are a method for regulating brightness of LCD on a terminal equipment and a device for regulating brightness of LCD on a terminal equipment. The said method involves gaining a pre-preserved duty ratio value corresponding to an application mode to be switched to based on switching information of the application mode of the terminal equipment, generating a pulse width modulating PWM signal with the duty ratio value, adjusting the current of a power supply circuit of a LCD that is to be switched to the application mode using the said PWM signal, thus changing the brightness of the LCD.

Description

Method, device, and terminal for adjusting brightness of liquid crystal display on terminal device. The present application claims to be submitted to the Chinese Patent Office on December 7, 2007, the application number is 200710195951.9, and the invention is entitled "Method and device for adjusting the brightness of the liquid crystal display on the terminal device. The priority of the Chinese Patent Application, the entire disclosure of which is incorporated herein by reference. Technical field

The present invention relates to the field of electronic technologies, and in particular, to a method, device and terminal for realizing automatic adjustment of brightness of a liquid crystal display on a terminal device. Background technique

Currently, on various communication terminal devices such as mobile, a (LCD, Liquid Crystal Display) display screen is generally used for displaying information such as data. However, for such a terminal device with an LCD display, the LCD will account for a considerable proportion of the total power consumption (referred to as "power consumption"). Therefore, as the functions of the terminal devices become more and more powerful, the corresponding power consumption is also increasing, how to reduce power consumption, especially how to extend the device usage time under limited battery capacity on the mobile terminal, called each An important topic for equipment manufacturers to study.

A method disclosed in the prior art that can reduce the power consumption of the LCD by manually adjusting the brightness of the LCD is: For an LCD display that can provide different application modes for the user to select, the user can manually set the LCD according to different application modes currently used. The brightness value corresponding to the screen. For example, if you want to read the text, because the background of the text is usually white and bright solid color, and the color is relatively simple, you can set the brightness of the LCD to the bottom, so that browsing the text for a long time can not only save power, but also Can alleviate visual fatigue.

However, during the research, the inventors found that at least the following problems exist in the prior art: Since the brightness of the adjustment LCD in the prior art can only be manually adjusted by the user, once the brightness is adjusted to a certain extent, for the subsequent whole The process will work at this brightness. Especially for terminal devices with multiple LCDs connected at the same time, all LCDs will work under this brightness after manual adjustment. Thus, if the application mode of each LCD is different, it cannot be selected according to the actual application of the LCD. Brightness. At this time, the flexibility of multiple LCDs is poor. At the same time, when the application mode is switched during use, the corresponding brightness needs to be manually adjusted again, so the use is less convenient. Summary of the invention

Embodiments of the present invention provide a method, a device, and a terminal for adjusting the brightness of an LCD on a terminal device, which can adaptively adjust the screen brightness of the LCD according to different applications, thereby achieving the purpose of reducing LCD power consumption and saving power.

A method for adjusting brightness of a liquid crystal display on a terminal device according to an embodiment of the present invention includes:

Obtaining a duty value corresponding to the pre-stored application mode to be switched according to the switching information of the terminal device application mode;

Generating a pulse width modulated PWM signal having the duty cycle value;

The P medical signal is used to adjust the current of the power supply circuit of the liquid crystal display of the terminal device to change the brightness of the liquid crystal display.

An embodiment of the present invention further provides an apparatus for adjusting brightness of a liquid crystal display on a terminal device, including:

At least one application module is respectively configured to provide a corresponding application mode for the liquid crystal display, and when switching to the corresponding application mode, outputting a duty value corresponding to the application mode;

a brightness control module, configured to acquire a duty cycle value issued by the application module, generate and output a PWM signal having the duty cycle value;

And a power management module, configured to supply power to the liquid crystal display, and adjust a current of the power supply circuit of the liquid crystal display by using a PWM signal from the brightness control module to change the brightness of the liquid crystal display.

An embodiment of the present invention further provides a terminal, including a device for adjusting brightness of a liquid crystal display, where the device includes:

At least one application module, configured to provide a corresponding application mode for the liquid crystal display, and output a duty ratio corresponding to the application mode when switching to the corresponding application mode; and a brightness control module, configured to acquire Applying a duty cycle value issued by the module, generating and outputting a PWM signal having the duty ratio value;

And a power management module, configured to supply power to the liquid crystal display, and adjust a current of the power supply circuit of the liquid crystal display by using a PWM signal from the brightness control module of the liquid crystal display to change the brightness of the liquid crystal display. In the embodiment of the present invention, when the application mode is switched, the average current of the power supply circuit of the LCD can be automatically adjusted according to the duty ratio corresponding to the application module, and the brightness of the LCD is adjusted by changing the current of the power supply, thereby achieving intelligent adjustment. Effect. At the same time, due to the timely switching, not only the different application modes can achieve the best display effect in time, the eyes are protected, and especially for the terminal devices connected with multiple LCDs at the same time, since the brightness can be independently adjusted, the terminal device is greatly reduced. The power consumption saves the power of the device and thus achieves an extended device life.

DRAWINGS

1 is a flow chart of a method in an embodiment of the present invention;

2 is a schematic block diagram of another method in an embodiment of the present invention;

3 is a schematic block diagram showing the structure of a device in an embodiment of the present invention;

4 is a schematic block diagram showing the structure of another device in an embodiment of the present invention;

FIG. 5 is a schematic block diagram showing the structure of a terminal according to an embodiment of the present invention; FIG.

FIG. 6 is a schematic block diagram showing another structure of a terminal according to an embodiment of the present invention. detailed description

The specific embodiments of the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The method for adjusting the brightness of the LCD on the terminal device provided by the embodiment of the present invention can adjust the current of the power supply of the LCD corresponding to the application mode to a specified value when switching to different application modes, thereby changing the brightness of the LCD.

As shown in FIG. 1 , a flow chart of a method for adjusting brightness of an LCD according to an embodiment of the present invention, before performing the method embodiment, pre-storing duty values of various application modes. The application mode includes: various application modes such as text reading, video playing, and picture browsing. Different duty cycle values for various application modes can be set and saved according to the application requirements of different application modes and the comfort level of the eye. For example, for text mode, set the duty value in this mode to 90%. The duty value can be set as the system default value before leaving the factory, or can be set by the user according to actual needs. Usually, the application mode is set in the application module, and one application module corresponds to one application mode. The method for adjusting the brightness of the LCD includes:

S101: When an application mode is used, starting an application module where the application mode is located, where the application module acquires a pre-stored duty ratio corresponding to an application mode to be switched, and then The LCD brightness control module transmits a call request message including a duty value corresponding to the application mode. The duty cycle value of the application mode can be directly set and saved in the corresponding application module, or in other control systems in the terminal device.

S102: The LCD brightness control module generates a pulse width adjustment PWM signal having the duty ratio according to the duty ratio value in the call request message.

S103: Adjust the average current of the power supply circuit output of the LCD to be switched to the application mode by using the PWM signal, and adjust the brightness of the LCD by changing the average current of the power supply.

The specific method for adjusting the average current output by the power supply circuit according to the duty ratio is: first generating a PWM (pulse width adjustment) signal having the duty value according to the duty value, and then using the The PWM signal is adjusted to the average current of the power supply circuit that supplies power to the LCD according to the formula i=I*R. Wherein, the i represents the average current, the I represents a peak current of a power supply circuit of an LCD to be applied in the application mode, and the R represents a duty ratio of the PWM signal.

In addition, when the duty value of each application mode is set and saved in another control system in the terminal device, the application mode sent by the application module to the LCD brightness control module in the above S101 may no longer include the application mode corresponding to the application mode. The duty cycle value, but the identifier that contains the application mode. In the above S102, the LCD brightness control module may directly obtain the duty value from a memory that stores a duty value of the application mode according to the received application mode specified in the call request message.

Based on the above technical solution, another embodiment of the present invention further discloses another method for adjusting the brightness of the LCD. The method is based on the manner shown in FIG. 1 above, when the LCD brightness control module adjusts the average current of the LCD. Before, it can also judge whether the received duty value is the duty value of the current PWM signal, and then adjust accordingly according to the judgment result. As shown in FIG. 2, it is a schematic block diagram of another method embodiment of the present invention. The method for adjusting the brightness of the LCD includes:

S201: When an application mode is used, starting an application module where the application mode is located, the application module acquires a pre-stored duty ratio corresponding to an application mode to be switched, and then sends the included to the LCD brightness control module. The application mode corresponds to the call request message of the duty value. Wherein, the duty value of the application mode can be preset and saved in the corresponding application module, or In other control systems in the terminal equipment.

S202: The LCD brightness control module determines whether the duty value in the request message is a duty value of a currently used PWM signal of an LCD to be switched to the application mode, and if yes, ends the process; otherwise, Go to S203.

S203: The LCD brightness control module generates a pulse width adjustment PWM signal having the duty ratio according to a duty value in the request message.

S204: Adjust the average current output by the power supply circuit of the LCD by using the PWM signal, and adjust the brightness of the LCD by changing the average current of the power supply.

In addition, the determining operation described in the above S202 may be performed by the judgment execution module having the judgment function on the terminal device, in addition to being executed by the LCD brightness control module. If the other execution module is executed, the judgment execution module instructs the LCD brightness control module to execute the S203 when the duty ratio value in the request message is not equal to the duty value of the current PWM signal. .

In addition, when the duty ratio value of each application mode is set and saved in another control system in the terminal device, the application mode sent by the application module to the LCD brightness control module in the above S201 may no longer include the corresponding application mode. The duty cycle value, but the identifier that contains the application mode. In the above S203, the LCD brightness control module may directly obtain the duty value from a memory that stores the duty value of the application mode according to the received application mode specified in the call request message, and then according to the The obtained duty ratio value performs a subsequent determination action.

In the above embodiment, when the application mode is switched, the average current of the power supply circuit of the LCD can be adjusted according to the duty ratio corresponding to the application module, and the brightness of the LCD is changed by changing the magnitude of the current supplied by the power. Therefore, the embodiment of the present invention can automatically request the LCD brightness adjustment module to change the supply current according to the specified duty ratio each time the application module is switched, thereby achieving intelligence. The effect of the adjustment. At the same time, because of the ability to switch in time, different application modes have different brightness to achieve the best display effect, and can protect the eyes.

Moreover, since the embodiment of the present invention adjusts the brightness of the LCD by adjusting the supply current of the LCD, and each LCD has its own independent supply current, when a plurality of LCDs are simultaneously connected to one terminal device, Different LCDs independently set their respective brightnesses. Therefore, especially for a plurality of LCDs, the power consumption of the terminal device can be reduced more, and the power of the device can be saved to achieve an effect of prolonging the use time of the device.

Based on the foregoing technical solution, the embodiment of the present invention further discloses a device for adjusting the brightness of the LCD on the terminal device, as shown in FIG. 3, which is a structure of an apparatus for adjusting the brightness of the LCD on the terminal device according to an embodiment of the present invention. Block diagram, the device includes: at least one application module 301, LCD brightness control module 302. In addition, at least one LCD 304 and an LCD Power Management Module (PMIC) 303 for providing power to the LCD 304 are included on the terminal device where the device is located. among them,

The application module 301 is used to provide various application modes for the LCD, such as text reading, video playback, picture browsing, and the like. An application module 301 corresponds to an application mode. Different duty cycle values for various application modes can be set according to the application requirements of different application modes and the comfort level of the eye. The duty cycle values of the respective application modes can be directly set and saved in the respective application modules 301.

When the application mode is to be switched, the application module 301 corresponding to the application mode is activated, and the application module 301 is configured to send the duty ratio corresponding to the application mode to the LCD brightness control module 302. Specifically, the call request message including the duty ratio corresponding to the application module 301 may be transmitted, and the manner of transmitting the duty value is not limited thereto. The LCD brightness control module 302 is configured to acquire a duty value sent by the application module 301. For example, when the duty value is sent by the call request message, the duty value may be obtained from the message after receiving the call request message, and then generated according to the duty value. The PWM signal of the duty cycle value is sent to the PMIC 303 corresponding to the LCD 304 of the application module 301 to be used. The PMIC 303 adjusts the average current output by the power supply circuit of the LCD 304 according to the formula i=I*R using the PWM signal to change the brightness of the LCD 304 by changing the average current. In addition, the embodiment of the present invention further discloses another device for adjusting the brightness of the LCD on the terminal device. The device embodiment is further capable of adjusting the LCD 304 at the LCD brightness control module 302 based on the device shown in FIG. Before the average current, it is first determined whether the received duty value is the duty value of the current PWM signal of the LCD 304, and then correspondingly adjusted according to the judgment result. FIG. 4 is a schematic structural block diagram of another apparatus according to another embodiment of the present invention. The apparatus further includes:

The determining execution module 305 is configured to receive the duty value after the application module 301 sends the duty ratio corresponding to the application module 301, and determine whether the duty value is related to the current PWM signal of the LCD 304. The ratio is the same, if the same, the current adjustment procedure is terminated; otherwise, the LCD brightness control module 302 is instructed to generate a PWM signal having the duty value according to the duty value, and then perform the pairing by the PWM signal. The brightness adjustment of the LCD 304.

The specific method for adjusting the output average current of the PMIC 303 is the same as that of the foregoing embodiments, and is not described here.

The application module 301 described in the foregoing apparatus shown in FIG. 3 and FIG. 4 may specifically include: a duty ratio storage unit (not shown) for holding a duty ratio value corresponding to the corresponding application mode; a message unit (not shown) for generating a call request message including a duty value saved by the duty cycle storage unit when switching an application mode, and outputting the call request message to the LCD The brightness control module 302 is configured to obtain, by the LCD brightness control module 302, the duty cycle value from the call request message.

In addition, the application module 301 is not limited to transmitting the duty ratio value to the LCD brightness control module 302 by using the call request message as described in the apparatus shown in FIG. 3 and FIG. 4 above. The duty cycle value is sent to the LCD brightness control module 302 by other messages or in other forms, for example.

In addition, the judgment execution module 305 in the above device embodiment may also be integrated on the LCD brightness control module 302. Moreover, the various modules described in the above device embodiments may exist separately from each other, but may also be integrated in whole or in part in one of the control chips on the terminal device.

In the foregoing device embodiment, the LCD brightness control module 302 can automatically pre-store the account module 301 corresponding to the application mode, each time the application module 301 is switched. The null ratio adjusts the magnitude of the output average current of the PMIC 303 corresponding to the LCD 304, thereby changing the brightness of the LCD 304. Therefore, it plays the role of intelligent adjustment. At the same time, since it is possible to switch in time, and different LCDs can be switched independently of each other, the terminal device which is connected to a plurality of LCDs at the same time not only saves energy consumption of the terminal device but also protects the eyes.

In addition, the embodiment of the invention further discloses a terminal having a function of adjusting the brightness of the LCD, and the terminal can automatically adjust the brightness of the LCD to the brightness required by the current application mode to achieve the effect of intelligent adjustment, thereby being better protected. At the same time of vision, it can also reduce the power consumption of the terminal in time. As shown in FIG. 5, it is a schematic block diagram of a structure of a terminal according to an embodiment of the present invention, where the terminal includes a device 501 for adjusting brightness of an LCD, and at least one LCD 502, where

The device 501 for adjusting the brightness of the LCD specifically includes at least one application module 5011, an LCD brightness control module 5012, and a PMIC 5013 for supplying power to the LCD 502. The application module 5011 is configured to provide an application mode corresponding to the module, such as text reading, video playback, and picture browsing, for the LCD. An application module 5011 corresponds to an application mode. Different duty cycle values for various application modes can be set according to the application requirements of different application modes and the comfort level of the eye. The duty cycle values for each application mode can be directly set and saved in their respective application modules 5011.

When the application mode is to be switched, the application module 5011 corresponding to the application mode is activated, and the application module 5011 is configured to send the duty ratio corresponding to the application mode to the LCD brightness control module 5012. Specifically, the call request message including the duty ratio value corresponding to the application module 5011 may be sent, and the manner of transmitting the duty ratio value is not limited thereto.

The LCD brightness control module 5012 is configured to acquire a duty value sent by the application module 5011. For example, when the duty value is sent by the call request message, the duty value may be obtained from the message after receiving the call request message, and then generated according to the duty value. The PWM signal of the duty cycle value is sent to the PMIC 5013 corresponding to the LCD 502 of the application module 5011 to be used. The PMIC 5013 uses the PWM signal to adjust an average current output by the power supply circuit of the LCD 502 to change the brightness of the LCD 502 by changing the average current. The specific method for adjusting the average current output by the power supply circuit by the PWM signal is the same as that of the foregoing method embodiment, and details are not described herein again. In addition, the embodiment of the present invention further discloses another terminal having a function of adjusting the brightness of the LCD. The terminal embodiment is further capable of adjusting the average current of the LCD 502 at the LCD brightness control module 5012 based on the terminal shown in FIG. 5 above. Before, it is first determined whether the received duty value is the duty value of the current PWM signal of the LCD 502, and then correspondingly adjusted according to the judgment result. As shown in FIG. 6 , it is a schematic block diagram of another terminal of the present invention. The terminal 501 of the terminal for adjusting the brightness of the LCD in the terminal further includes:

The determining execution module 5014 is configured to receive the duty value after the application module 5011 sends the duty ratio corresponding to the application module 5011, and determine whether the duty value is related to the current PWM signal of the LCD 502. The ratio is the same, if the same, the current adjustment procedure is terminated; otherwise, the LCD brightness control module 5012 is instructed to generate a PWM signal having the duty value according to the duty value, and then perform the pairing by the PWM signal. The brightness adjustment of the LCD 502. The specific method for adjusting the average output current of the PMIC 5013 is the same as that of the foregoing embodiments, and is not described here.

The application module 5011 described in the terminal shown in FIG. 5 and FIG. 6 may specifically include: a duty ratio storage unit (not shown) for saving a duty value corresponding to the corresponding application mode; a message unit (not shown) for generating a call request message including a duty value saved by the duty cycle storage unit when switching an application mode, and outputting the call request message to the LCD The brightness control module 5012 is configured to obtain, by the LCD brightness control module 5012, the duty cycle value from the call request message.

In addition, the application module 5011 is not limited to the duty value reported by the call request message sent to the LCD brightness control module 5012 as described in the terminal shown in FIG. 5 and FIG. 6 above. The duty cycle value is sent to the LCD brightness control module 5012 by other messages or in other forms, for example.

In addition, the judgment execution module 5014 in the above terminal embodiment may also be integrated on the LCD brightness control module 5012. Moreover, the various modules in the terminal provided by the above embodiments may not only exist separately from each other, but may also be integrated in whole or in part in one of the control chips on the terminal.

In the foregoing terminal embodiment, the LCD brightness control module 5012 can automatically save in advance according to the application module 5011 corresponding to the application mode, each time the application module 5011 is switched. The duty ratio value adjusts the magnitude of the output average current of the PMIC 5013 corresponding to the LCD 502, thereby changing the brightness of the LCD 502. Therefore, it plays the role of intelligent adjustment. At the same time, since it is possible to switch in time, and different LCDs can be switched independently of each other, the terminal device which is connected to a plurality of LCDs at the same time not only saves energy consumption of the terminal device but also protects the eyes.

The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, ie may be located One place, or it can be distributed to multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the objectives of the embodiment. Those of ordinary skill in the art can understand and implement without undue creative work.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is a better implementation. the way. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product, which may be stored in a storage medium such as a ROM/RAM or a disk. , an optical disk, etc., includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described in various embodiments of the present invention or portions of the embodiments.

The embodiments of the present invention described above are not intended to limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

Rights request

A method for adjusting brightness of a liquid crystal display on a terminal device, the method comprising:

Generating a pulse width modulated PWM signal having the duty cycle value;

The PWM signal is used to adjust the current of the power supply circuit of the liquid crystal display of the terminal device to change the brightness of the liquid crystal display.

2. The method of adjusting the brightness of a liquid crystal display according to claim 1, wherein the obtaining the duty ratio corresponding to the application mode to be switched to comprises:

Receiving a call request message including a duty ratio value corresponding to the application mode to be switched to;

The duty cycle value is extracted from the call request message.

The method of adjusting the brightness of the liquid crystal display according to claim 1, wherein the adjusting the current of the power supply circuit by using the PWM signal comprises:

Multiplying the duty value of the PWM signal by the peak current of the power supply circuit to obtain an average current of the power supply circuit.

The method of adjusting the brightness of a liquid crystal display according to claim 1 or 2, wherein before the generating the PWM signal of the duty ratio, the method further comprises:

Determining whether the duty ratio value is a duty value of a PWM signal currently used by the liquid crystal display of the terminal device, and if so, ending the current adjustment process; otherwise, performing the operation of generating the PWM signal of the duty ratio.

5. A device for adjusting brightness of a liquid crystal display on a terminal device, the device comprising:

a power management module for providing power to the liquid crystal display and using the brightness control The PWM signal of the module adjusts the current of the power supply circuit of the liquid crystal display to change the brightness of the liquid crystal display.

The adjusting device according to claim 5, wherein the application module comprises: a duty ratio storage unit, configured to save a duty value corresponding to an application mode;

And a request message unit, configured to: when switching the application mode, acquire a duty value corresponding to the application mode from the duty cycle storage unit, generate a call request message including the duty value, and A call request message is sent to the brightness control module.

The apparatus according to claim 5, wherein the apparatus further comprises: a judgment execution module, configured to determine whether the duty ratio is related to the liquid crystal according to a duty value issued by the application module The duty value of the current PWM signal of the display is the same. When the determination is not the same, the brightness control module is instructed to perform the operation of generating the P medical signal of the duty value.

8. A terminal, comprising: means for adjusting brightness of a liquid crystal display, said means comprising:

At least one application module is respectively configured to provide a corresponding application mode for the liquid crystal display, and when switching to the corresponding application mode, output a duty value corresponding to the application mode;

And a power management module, configured to supply power to the liquid crystal display, and adjust a current of the power supply circuit of the liquid crystal display by using a PWM signal from the brightness control module of the liquid crystal display to change the brightness of the liquid crystal display.

The terminal according to claim 8, wherein the application module comprises: a duty ratio storage unit, configured to save a duty ratio value corresponding to an application mode;

The terminal according to claim 8, wherein the device further comprises: a judgment execution module, configured to determine, according to a duty value issued by the application module, whether the duty value is related to the liquid crystal display The duty values of the current PWM signals are the same. When the determination is not the same, the brightness control module is instructed to perform the operation of generating the P medical signal of the duty value.