TWI476749B - Electronic device with backlight control and control method thereof - Google Patents

Description

Electronic device with backlight control and control method thereof

The invention relates to an electronic device and a control method thereof, in particular to an electronic device with backlight control and a control method thereof.

Nowadays, more and more electronic devices include a display unit and a touch input unit. The display unit displays digital content, and the touch input unit can display a plurality of function table items, and the user operates the content displayed by the display unit by selecting a function table item in the touch input unit. For example, the menu item includes a direction key, a numeric key, etc., the user can select the direction key to control the movement of the currently displayed content, and the digital key can be selected to input the corresponding number. However, when an existing electronic device displays a function item, it usually turns on the backlight of the entire touch input unit. However, in some cases, a part of the function item displayed in the touch input unit is independent of the content currently displayed by the display unit, and therefore, the display area point corresponding to the function item in the touch input unit that is not related to the content currently displayed by the display unit Bright, it is bound to increase the power consumption of the electronic device.

In view of this, the present invention provides an electronic device with backlight control and a control method thereof.

The backlight controlled electronic device comprises a memory, a processing unit and a display unit. The electronic device further includes an input unit, the input unit is divided into at least two display areas, each display area displays a functional type of function item, and each display area corresponds to an LED backlight module; the memory is used for Storing a display content-function table item correspondence table and a function table item-LED backlight module correspondence table, wherein the display content-function table item correspondence table records a function table corresponding to each type of content displayed by the display unit Item function type, the LED backlight module correspondence table records the LED backlight module of the input unit corresponding to each function type function item; the processing unit includes: a function table item control module, And determining, according to the content currently displayed by the display unit and the display content-function table item correspondence table, a function item function type corresponding to the content currently displayed by the display unit; an LED determining module, configured to use the determined function table The function type of the item and the function table item-LED backlight module correspondence table determine an LED backlight module of the input unit corresponding to the determined function item function type; and An LED driving control module is configured to send a driving control signal after the LED determining module determines the LED backlight module; and the electronic device further includes an LED driving circuit for driving according to the LED driving control module The control signal turns on the LED backlight module of the input unit determined.

The backlight control method is applied to an electronic device including a display unit and an input unit, the input unit includes at least two display areas, each display area displays a function type of a function item, and each display area corresponds to an LED. a backlight module, the method comprising the steps of: determining a function item function type corresponding to the content currently displayed by the display unit; determining an LED backlight module of the input unit corresponding to the determined function item function type; and determining The LED backlight module sends a drive control signal to turn on the determined LED backlight module.

The electronic device with backlight control and the control method thereof according to the invention selectively turn on the LED backlight module of the input unit according to the content currently displayed by the display unit, so as to realize the partition lighting of the input unit and reduce the power consumption of the input unit.

Referring to FIGS. 1 and 2 , the electronic device 1 includes a display unit 10 and an input unit 20 . The display unit 10 can display digital content, and the input unit 20 can display a function table item, such as a flip-up and a scroll-down function item as shown in FIG. 2, and the user can control some or all of the function items displayed on the input unit 20. The content currently displayed on the display unit 10. In the embodiment, the input unit 20 is a touch screen and is divided into a plurality of display areas, each of which corresponds to an LED (light emitting diode) backlight module, and the function table displayed by the input unit 20 Items are classified by function type, and function items corresponding to the same function type are displayed in the same display area. In the present embodiment, the input unit 20 is divided into three display areas 22, 24, 26, which respectively correspond to the LED backlight modules 220, 240, 260, wherein the display area 22 displays text. The function table items corresponding to the function type are edited, such as letters and numbers, the display area 24 displays the function table items of the direction control function type, and the display area 26 displays the function table items corresponding to the picture editing function type. In addition, when the selected function item further includes the next layer function item, the corresponding display area displays the lower layer function item of the selected function item. For example, when the letter function item is selected, the display area 22 displays the A~B function table items under the letter function table item. Preferably, the input unit 20 can also display upper and lower reels, left and right reels, and operate the reels to move the function items displayed on the input unit 20. In particular, when the electronic device 1 can execute more function items and cannot be completely displayed on the input unit 20, the input unit 20 hides some of the function items, and the scrolls can be displayed to be hidden. Menu item.

The electronic device 1 further includes a memory 30. The memory 30 stores a display content-function table item correspondence table (hereinafter referred to as correspondence table 1) and a function table item-LED backlight module correspondence table (hereinafter referred to as correspondence table 2). The functional item function type corresponding to each type of display content displayed on the display unit 10 is recorded in the corresponding table 1. Corresponding to Table 2, the LED backlight module corresponding to each function type of the function table item is recorded. Each type of display content may correspond to a function type item of one function type, or may also correspond to a function item item of multiple function types. Each functional type of function item corresponds to an LED backlight module. The electronic device 1 determines the function type of the function item corresponding to the currently displayed content according to the content currently displayed by the display unit 10 and the corresponding table 1 , and determines the current display of the display unit 10 according to the determined function item function type and the corresponding table 2 The LED backlight module corresponding to the function type of the function item corresponding to the content is used to turn on the corresponding LED backlight module, so that the function table item corresponding to the content currently displayed by the display unit 10 is in a visible state.

Corresponding to Table 1

Corresponding to Table 2

The electronic device 1 further includes a processing unit 40 and an LED driving circuit 50.

The processing unit 40 includes a function item control module 41, an LED determination module 42 and an LED drive control module 43.

The function item control module 41 is configured to determine a function item function type corresponding to the currently displayed content according to the content currently displayed by the display unit 10 and the correspondence table 1. The menu item control module 41 is further configured to control the content currently displayed by the input unit 20 in response to the user's operation on the input unit 20.

The LED determining module 42 is configured to determine, according to the function item function type determined by the function item control module 41 and the corresponding table 2, the LED backlight mode corresponding to the function item function type corresponding to the content currently displayed by the display unit 10. group. After the LED determining module 42 determines the LED backlight module corresponding to the function type of the function item corresponding to the content currently displayed by the display unit 10, the LED driving control module 43 sends an LED driving control signal to the LED driving circuit 50. , to determine the LED backlight module.

3 is a specific circuit diagram of the LED driving circuit 50 according to an embodiment of the present invention, including a power supply module 52, a conduction module 54 and a first connector 56. In the embodiment, the input unit 20 further includes a second connector 27 electrically connected to the first connector 56. The LED backlight modules 22, 24, 26 are electrically connected to the LED through the second connector 27. Drive circuit 50. In this embodiment, the LED backlight modules 22, 24, 26 are connected in parallel, and each of the LED backlight modules 22, 24, 26 includes three LEDs D connected in series, and each LED backlight module 22, 24 The drive current of 26 is 20 mA. In the embodiment, the first connector 56 and the second connector 27 are pluggable, so that the number of the LED backlight modules can be easily replaced as needed.

The power module 52 includes a power interface 520 and a control chip 522. The power interface 520 is for electrically connecting to a power source (not shown) to provide the electrical energy required by the LED driver circuit 50, which may be a battery, a utility adapter, or the like. The control chip 522 includes a voltage input terminal VIN, a ground terminal GND, a feedback terminal FB, and an output terminal OUT. The input terminal VIN is electrically connected to the power source 520. The feedback terminal FB is electrically connected to the conduction module 54 via a resistor R3. The output terminal OUT outputs a driving current according to the current value of the feedback terminal FB for driving the LED backlight modules 22, 24, 26 to emit light. The voltage value at the feedback terminal FB is a fixed value. In the present embodiment, the voltage value is VFB. The power supply module 52 also includes other electrical components, and the functions of the components are not the invention of the present invention, and the components are not described in detail herein.

In this embodiment, since the input unit 20 includes three LED backlight modules 22, 24, 26, the conduction module 54 correspondingly includes three conductive sub-modules 540, 542, and 544, and the three conductive sub-modules. The groups 540, 542, and 544 are electrically connected to the LED backlight modules 22, 24, 26 through the first connector 56 and the second connector 27, respectively. In this embodiment, each of the conductive sub-modules 540, 542, and 544 includes field effect transistors Q1 and Q2 and a resistor R1 connected in series between the first connector 56 and the ground. The drain of the field effect transistor Q1 is connected to the first connector 56, the source of the field effect transistor Q1 is connected to the drain of the field effect transistor Q2, and the source of the field effect transistor Q2 is grounded via the resistor R1. The schematic poles of the field effect transistors Q1 and Q2 of each of the conduction sub-modules 540, 542, and 544 are connected to each other to form a control signal input terminal S. The control signal input terminal S is electrically connected to the processing unit 40 for receiving the processing unit. The LED driving control module 43 of 40 drives the LED drive control signal. When one of the conduction sub-modules receives the LED driving control signal, the conduction sub-module is turned on, thereby electrically connecting the current loop of the LED backlight module electrically connected to the conduction sub-module.

The connection point d1 of the source of the potential transistor Q1 and the drain of the field effect transistor Q2 is electrically connected to the feedback terminal of the control chip 522 through the resistor R3 for generating a feedback signal to the control chip 522. End FB. Each of the conductive sub-modules further includes a resistor R2 electrically coupled between the source of the field effect transistor Q2 and the ground. The resistance of the resistor R2 is much larger than the resistance of the resistor R1.

When the LED driving control module 43 inputs the LED driving control signal to the signal input terminal S of the plurality of conducting sub-modules, when the field effect transistors Q1 and Q2 of the corresponding conducting sub-modules are turned on, the plurality of conducting sub-modules The set of resistors R1 are connected in parallel with each other between the resistor R3 and the ground. Since the resistance value of the resistor R2 is much larger than the resistance value of the resistor R1, the branch where the resistor R2 is located is equivalent to an open circuit, and the feedback terminal FB of the control wafer 522 and the resistor R3, the resistor R1 connected in parallel, and the ground point constitute a current path. Since the feedback terminal FB of the control chip 522 is at a constant voltage, the feedback terminal FB of the control chip 522 obtains a current value of VFB/(R3+R1/N), where N is a parallel resistance. Since the number of R1 is constant for VFB, R1, and R3, the current value differs depending on the number of resistors R1 connected in parallel. The output terminal OUT of the control chip 522 outputs a conduction current I to the LED backlight module corresponding to the conduction sub-module according to the current value of the feedback terminal FB. In this embodiment, the output current OUT of the control wafer 522 is output to the LED backlight module 22, 24, 26, and the conduction current I at the parallel connection point d4 is VFB/R, and the R value is located at the resistor R3 and the ground point. The resistance value of the conduction module 54 is the parallel value of the resistance R1 of all the conduction sub-modules that are turned on by receiving the LED driving control signal. For example, if only one control signal input terminal S of the conduction sub-module receives the control signal of the processing unit 40, the R=R1, when the control signal input terminal S of the two conduction sub-modules receives the processing unit 40 The control signal, the resistors R1 in the two conduction sub-modules are connected in parallel and connected between the resistor R3 and the ground point, so that R=R1/2.

After the field effect transistors Q1 and Q2 in the conduction sub-module are turned on, the negative terminal of the LED backlight module corresponding to the conduction sub-module is grounded through the conduction sub-module, so that the current loop of the LED backlight module is turned on. When the plurality of conductive sub-modules receive the control signals of the processing unit 40, a corresponding number of LED backlight modules are turned on. As described above, the output I of the control chip 522 is output to the parallel connection point d4 of the LED backlight modules 22, 24, 26, and the current I is VFB/R. When only one conduction sub-module receives the LED drive control signal, it is turned on. When R=R1, only one LED backlight module is turned on, and the current flowing to the LED backlight module is VFB/R1. When N conductive sub-modules receive the LED driving control signal, the current is turned on. The resistance R is R1/N, and the current flowing to the parallel connection point d4 is N*VFB/R1. At this time, corresponding to the N LED backlight modules being turned on, the current shunted to each LED backlight module is still VFB. /R1. Therefore, regardless of the number of currently turned on LED backlight modules, the current flowing through each LED backlight module is a constant value.

In this embodiment, the voltage value VFB at the feedback end FB is 0.2 volts, and the resistance value of R2 is 10 ohms, when only one conduction sub-module is turned on, for example, when the conduction sub-module 540 is turned on, the connection point d4 is The current I is 20 mA, and the driving current of the LED backlight module 22 reaches 20 mA, and the LED backlight module 22 emits light. When the two conduction sub-modules are turned on, for example, when the conduction sub-modules 540 and 542 are turned on, the current I at the connection point d4 is 40 mA, and the driving currents of the LED backlight modules 22 and 24 are 20 mA, and the LED backlight mode is 20 mA. Groups 22, 24 illuminate. When the three conduction sub-modules 540, 542, and 544 are turned on, the current I at the connection point d4 is 60 mA, and the driving current of the LED backlight modules 22, 24, and 26 is still 20 mA after being shunted, and the LED backlight module 22, 24, 26 normal light.

4 is a flow chart of a method for implementing backlight control of an electronic device according to an embodiment of the present invention.

In step S401, the function item control module 41 determines the function item function type corresponding to the current display content according to the content currently displayed by the display unit 10 and the correspondence table 1 stored in the memory 30.

In step S402, the LED determining module 42 determines the LED backlight module of the input unit 20 corresponding to the determined function item function type according to the determined function item function type and the corresponding table 2 stored in the memory 30.

Step S403, the LED driving control module 43 sends a driving control signal to the LED driving circuit according to the determined LED backlight module to turn on the determined LED backlight module.

1‧‧‧Electronic device

10‧‧‧Display unit

20‧‧‧ input unit

22, 24, 26‧‧‧ display area

220, 240, 260‧‧‧ LED backlight module

30‧‧‧ memory

40‧‧‧Processing unit

41‧‧‧Function Item Control Module

42‧‧‧LED determination module

43‧‧‧LED drive control module

50‧‧‧LED drive circuit

1 is a hardware structural diagram of an electronic device with backlight control according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing contents displayed by a display unit and an input unit of the electronic device of FIG. 1. FIG.

FIG. 3 is a specific circuit diagram of the LED driving circuit of FIG. 1.

4 is a flow chart of a method for backlight control in an embodiment of the present invention.

1‧‧‧Electronic device

10‧‧‧Display unit

20‧‧‧ input unit

22, 24, 26‧‧‧ display area

220, 240, 260‧‧‧ LED backlight module

30‧‧‧ memory

40‧‧‧Processing unit

41‧‧‧Function Item Control Module

42‧‧‧LED determination module

43‧‧‧LED drive control module

50‧‧‧LED drive circuit

Claims (6)

An electronic device with backlight control includes a memory, a processing unit and a display unit, and the improvement is as follows:
The method further includes an input unit, wherein the input unit is divided into at least two display areas, each display area displays a function type item of a function type, and each display area corresponds to an LED backlight module;
The memory is used for storing a display content-function table item correspondence table and a function table item-LED backlight module correspondence table, and the display content-function table item correspondence table records each type of content displayed by the display unit. Corresponding function item function type, the function table item-LED backlight module correspondence table records the LED backlight module of the input unit corresponding to the function item of each function type;
The processing unit includes:
a function item control module, configured to determine, according to the content currently displayed by the display unit and the display content-function table item correspondence table, a function item function type corresponding to the content currently displayed by the display unit;
An LED determining module, configured to determine, according to the determined function item function type and the function table item-LED backlight module correspondence table, an LED backlight module of the input unit corresponding to the determined function item function type; And an LED driving control module, configured to send a driving control signal after the LED determining module determines the LED backlight module; and further comprising an LED driving circuit, configured to send a driving control signal according to the LED driving control module Turning on the LED backlight module of the input unit determined. The electronic device with backlight control according to claim 1, wherein the input unit is a touch screen. The electronic device with backlight control according to claim 1, wherein the LED driving circuit comprises:
a power supply module for providing power required for the operation of the LED driving circuit; and a conducting module for controlling the input signal corresponding to the determined function item type according to the control signal sent by the LED driving control module LED backlight module. An electronic device with backlight control according to claim 3, wherein:
The power supply module includes a control chip, and the control chip includes a feedback end and an output end. The voltage value at the feedback end is a constant voltage value, and the output terminal outputs a driving current according to the current value at the feedback end. An LED backlight module that turns on the input unit; and the conductive module includes at least two conductive sub-modules, each conductive sub-module is electrically connected to an LED backlight module of the input unit, and each conductive sub-module The group includes a feedback resistor electrically connected to the feedback end of the control chip, and the parallel resistance value of the feedback resistor in the turned-on conduction sub-module and the voltage value at the feedback end determine the input unit The on current of the LED backlight module. A backlight control method is applied to an electronic device including a display unit and an input unit, the input unit includes at least two display areas, each display area displays a function type of a function item, and each display area Corresponding to an LED backlight module, the improvement is that the method comprises the steps of:
Determining a function item function type corresponding to the content currently displayed by the display unit;
Determining an LED backlight module of the input unit corresponding to the determined function item function type; and transmitting a driving control signal according to the determined LED backlight module to turn on the determined LED backlight module. The backlight control method of claim 5, wherein the input unit is a touch screen.