TWI407395B - Portable electronic device can dynamically adjusting back light and method of adjusting back light - Google Patents

Abstract

A method of dynamically adjusting back light includes the following steps. Providing a portable electronic device including an image sensor, a signal processor a back light module and a back light module controller, connected electronically together. The image sensor senses a light from outside, and forms it into an image. The image is sent to the signal processor by the image sensor. The signal processor determines the needed back light intensity, and sends an instruction to the back module controller. The back module controller controls the back light intensity provided by the back light module based on the received instruction. A portable electronic device with low cost and convenience is also disclosed.

Description

Portable electronic device capable of dynamically adjusting backlight and method for adjusting backlight thereof

The invention relates to a portable electronic device capable of dynamically adjusting a backlight and a method for adjusting the backlight thereof, in particular to a portable electronic device capable of dynamically adjusting a backlight by using an image sensing module and a method for dynamically adjusting the backlight.

With the development of multimedia technology, portable electronic devices with digital cameras and camera functions are increasingly favored by consumers. The popularity of mobile phones and notebook computers is particularly prominent. Typically, users use a mobile phone or laptop in different lighting conditions. If the backlight intensity of a mobile phone or laptop is kept constant and is not dynamically adjusted due to changes in external light intensity, in some cases, the user may feel uncomfortable with the backlight intensity of the mobile phone or notebook. It also wastes resources due to unnecessary light power consumption.

Therefore, on some portable electronic devices, a photometric sensor is configured. The photometric sensor adjusts the backlight intensity of the portable electronic device according to the detected brightness, thereby reducing the power consumption and making the user more comfortable to use the portable device.

However, the use of a photometric sensor in a portable electronic device usually requires a sense of luminosity. The space provided by the device is not in line with the trend of light, thin, short and small portable electronic devices. At the same time, since the digital camera or camera of the portable electronic device itself can also detect the brightness, the use of the photometric sensor inevitably increases the cost of the portable electronic device.

In view of this, it is necessary to provide a method of dynamically adjusting the backlight using a camera module.

In addition, it is necessary to provide a portable electronic device that dynamically adjusts the backlight using a camera module.

A portable electronic device capable of dynamically adjusting a backlight comprises an image sensing module electrically connected, a signal processing module, a backlight module and a backlight adjusting module. The image sensing module is configured to sense light of an external environment, form an image signal, and send the optical image signal to the signal processing module. The signal processing module is configured to determine a required backlight brightness according to the received optical image signal, and send an instruction to the backlight adjustment module. The backlight adjustment module is configured to control the brightness of the backlight provided by the backlight module according to the command sent by the signal processing module.

A method for dynamically adjusting a backlight, the method comprising the steps of: providing a portable electronic device, comprising: an image sensing module electrically connected, a signal processing module, a backlight module, and a backlight adjusting module. The image sensing module senses the light of the external environment, forms an optical image signal, and sends the optical image signal to the signal processing module. The signal processing module determines the required backlight brightness based on the received information and sends an instruction to the backlight adjustment module. The backlight adjustment module controls the backlight brightness provided by the backlight module according to the command sent by the signal processing module.

Compared with the prior art, the method for dynamically adjusting the backlight and the portable electronic device of the present invention can eliminate the photometric sensor used in the prior art, and dynamically adjust the image sensing device inherent to the portable electronic device. The effect of backlighting greatly improves the convenience of use, while saving product cost and reducing the size of portable electronic devices.

10‧‧‧Portable electronic device

12‧‧‧Image Sensing Module

14‧‧‧Signal Processing Module

18‧‧‧Backlight adjustment module

16‧‧‧Backlight module

FIG. 1 is a functional block diagram of a portable electronic device capable of dynamically adjusting backlight according to a preferred embodiment of the present invention.

2 is a flow chart of a method for dynamically adjusting a backlight according to a preferred embodiment of the present invention.

Referring to FIG. 1 , a portable electronic device 10 capable of dynamically adjusting backlights according to a preferred embodiment of the present invention includes an image sensing module 12 , a signal processing module 14 , a backlight module 16 , and a backlight adjustment electrically connected to each other. Module 18. The image sensing module 12 can be used to sense the light from the external environment, and the optical image signal is transmitted to the signal processing module 14; the signal processing module 14 is configured to process the optical image signal from the image sensing module 12. The backlight module 16 is used to provide backlighting for the portable electronic device 10; the backlight adjustment module 18 is used to turn on or off the backlight module 16 and control the backlight module 16 to provide backlight strength.

Please refer to FIG. 2 further. FIG. 2 is a flow chart of dynamically adjusting the backlight of the portable electronic device 10 in use. In step 20, the user sets whether the backlight needs to be dynamically adjusted according to actual needs. If not required, the process of dynamically adjusting the backlight ends. If necessary, the image sensing module 12 senses the light from the external environment to form an optical image signal, and sends the optical image signal to the signal processing module 14. step In step 22, the signal processing module 14 converts the received optical image signal from the analog signal into a digital signal, and calculates the optical image signal corresponding to YUV (also known as YCrCb, which is a color coding method adopted by the European television system. Where Y represents brightness; U and V represent chromaticity) the Y value of the color space, and the Y value is the gray value of the optical image signal, from which the brightness of the ambient light is known. The signal processing module 14 determines the backlight brightness required by the backlight module 16 according to the Y value, and sends an instruction to the backlight adjustment module 18. In step 23, the backlight adjustment module 18 performs the adjustment of the backlight of the backlight module 16 according to the instruction sent by the signal processing module 14. In step 24, the user sets whether it is necessary to stop the dynamic adjustment of the backlight as needed. If it is necessary to stop, the process of dynamically adjusting the backlight ends; if it is not necessary to stop, return to step 21.

For example, in the case of a mobile phone using a TFT (Thin Film Transistor) screen, if a fixed screen brightness is used, the higher the ambient brightness, the less clear the screen will be; and the lower the ambient brightness, the screen will be It will be clearer, but it may be too glaring. When the backlight is to be dynamically adjusted, the image sensing module 12 of the built-in camera module of the mobile phone first senses external light to form an optical image signal, and transmits the optical image signal to the signal processing module 14. The signal processing module 14 derives the current ambient brightness Y value based on the optical image signal received from the image sensing module 12. The signal processing module 14 determines the required backlight brightness based on the ambient brightness Y value and sends an instruction to the backlight adjustment module 18. The backlight adjustment module 18 dynamically adjusts the intensity of the backlight provided by the backlight module 16 according to the command sent by the signal processing module 14, so that the backlight brightness of the mobile phone screen increases when the ambient brightness is high, so that the user can more The screen is clearly visible; when the ambient brightness is low, the brightness of the mobile phone screen is reduced, so that it is not glaring and saves power. In addition, if the mobile phone keypad uses a backlight module 16, can also set the brightness of the keyboard backlight module by dynamically adjusting the backlight intensity.

In order to avoid the user's inconvenience when the ambient brightness changes too little, the backlight intensity change frequency is too high. You can use the interval value grouping for different environments, divide the ambient brightness Y value into multiple groups, and store the group in the signal. Processing module 14. The ambient brightness Y value is within a certain interval, corresponding to a certain backlight intensity. In addition, if the signal processing module 14 does not have the function of calculating the Y value, the hue conversion can be performed, and the RGB (Red-Green-Blue) color space is converted into the YUV space to obtain the Y value, so the signal processing module 14 can The Y value is not obtained by direct calculation.

It can be understood that the portable electronic device to which the present invention is applicable may be a mobile phone having a camera module, a portable digital device such as a PDA (Personal Digital Assistant), a camera or a notebook computer.

The portable electronic device capable of dynamically adjusting the backlight and the method for dynamically adjusting the backlight according to the present invention can eliminate the photometric sensor used in the prior art, and dynamically adjust the image sensing module 12 inherent to the portable electronic device. The effect of backlighting greatly improves the convenience of use, while also saving product cost and reducing the size of the portable electronic device.

Claims (6)

A method for dynamically adjusting a backlight includes the following steps: (a) providing a portable electronic device, comprising: an image sensing module electrically connected, a signal processing module, a backlight module, and a backlight adjustment mode In the group, the signal processing module stores a group of complex Y values grouped by interval values, and Y values in different Y value groups correspond to different backlight brightnesses, and all Y values in each Y value group correspond to The same backlight brightness; (b) the image sensing module senses the light of the external environment, forms an optical image signal, and transmits the optical image signal to the signal processing module; (c) the signal processing module according to the received light The image signal obtains a corresponding Y value, and determines the required backlight brightness according to the Y value group in which the Y value is located, and sends an instruction to the backlight adjustment module; and (d) the backlight adjustment module sends the signal according to the signal processing module. The backlight adjustment module performs dynamic adjustment of the backlight of the backlight module; wherein, when the ambient brightness increases, the backlight adjustment module increases the backlight brightness of the backlight module; when the ambient brightness decreases, the backlight adjustment module decreases Description The optical module according to the backlight luminance. The method for dynamically adjusting the backlight according to claim 1, wherein in the step (c), the signal processing module calculates the Y value of the YUV color space of the optical image signal according to the received optical image signal, according to which The Y value determines the required backlight brightness and sends an instruction to the backlight adjustment module. The method for dynamically adjusting the backlight according to the first aspect of the patent application, wherein in the step (c), the signal processing module performs the hue conversion on the acquired optical image signal by the RGB color. The space is converted to the YUV space to obtain a Y value, and the required backlight brightness is determined according to the Y value, and an instruction is sent to the backlight adjustment module. A portable electronic device includes: an image sensing module; a signal processing module, wherein the signal processing module stores a group of complex Y values grouped by interval values, and Y in different Y value groups The values correspond to different backlight brightnesses, and all Y values in each Y value group correspond to the same backlight brightness; a backlight module for providing backlight to the portable electronic device; and a backlight adjustment module; The image sensing module is configured to sense light of an external environment, form an optical image signal, and send the optical image signal to the signal processing module; the signal processing module is configured to obtain a light signal according to the received light image Corresponding Y value, and determining the required backlight brightness according to the Y value group in which the Y value is located, and sending an instruction to the backlight adjustment module; the backlight adjustment module is configured to control the backlight mode according to the instruction sent by the signal processing module The backlight adjustment module increases the backlight brightness of the backlight module when the ambient brightness increases; and the backlight adjustment module reduces the backlight backlight of the backlight module when the ambient brightness decreases. . The portable electronic device of claim 4, wherein the signal processing module calculates the Y value of the YUV color space of the optical image signal according to the received optical image signal, and determines the required value according to the Y value. Backlight brightness and send commands to the backlight adjustment module. The portable electronic device of claim 4, wherein the signal processing module performs hue conversion on the acquired optical image signal, and converts the RGB color space into the YUV space to obtain a Y value, and determines the Y value according to the Y value. Required backlight brightness and adjust the mode to the backlight The group sends an instruction.