Screen brightness automatic switching method and device

Abstract

The invention relates to the technical field of screen brightness switching devices, in particular to an automatic screen brightness switching method and device, and the device comprises a control circuit, a switching circuit, a current limiting circuit and an LED lamp bead group. The number of the switch circuits is multiple, and the multiple switch circuits are connected with the control circuit. A plurality of current limiting circuits are provided, and the plurality of current limiting circuits are respectively connected with the control circuit; the number of the LED lamp bead sets is multiple, and each LED lamp bead set is connected with the corresponding switching circuit and the corresponding current limiting circuit. Different instructions are input to the control circuit, the control circuit outputs control signals to the corresponding switching circuits according to the instructions, the switching circuits open and lighten the corresponding LED lamp bead sets, and screen brightness adjustment is achieved; the brightness of the screen can be freely switched according to needs, and the applicability of the screen is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of screen brightness switching devices, and in particular to a method and device for automatically switching screen brightness. Background Art

[0002] The brightness of the display is determined by the backlight. Currently, there are two main types of display screens in terms of brightness: low brightness, such as a display screen with a maximum brightness of 250 nit, and high brightness, such as a display screen with a maximum brightness of 700 nit or higher. There are many ways to display a high-brightness display screen, such as increasing the backlight current and applying a brightness enhancement film.

[0003] In the design process of products using display screens, only normal brightness display screens or high brightness display screens can be selected. When the product uses normal brightness display screens, if you want to have the brightness of high brightness display screens, you can only replace it with a new high brightness display screen. The existing display screen cannot switch the screen brightness at will as needed, and has the problem of poor applicability. Summary of the invention

[0004] The purpose of the present invention is to provide a method and device for automatically switching screen brightness, which can arbitrarily switch the screen brightness to high or low brightness as needed, thereby improving applicability.

[0005] To achieve the above-mentioned purpose, in a first aspect, the present invention provides a device for automatically switching screen brightness, comprising a control circuit, a switch circuit, a current limiting circuit and an LED lamp bead group; There are multiple switch circuits, and the multiple switch circuits are respectively connected to the control circuit; there are multiple current limiting circuits, and the multiple current limiting circuits are respectively connected to the control circuit; there are multiple LED lamp bead groups, and each LED lamp bead group is respectively connected to each switch circuit and respectively connected to each current limiting circuit.

[0006] As a preferred technical solution, the control circuit includes a chip U1, a capacitor C1, a capacitor C2, a resistor R2, an inductor L1, a diode D10, a capacitor C3 and a capacitor C4; the ground pin of the chip U1 is grounded; one end of the capacitor C1 is connected to the power input pin of the chip U1, and the other end is grounded; one end of the capacitor C2 is connected to the power input pin of the chip U1, and the other end is grounded; one end of the resistor R2 is connected to the enable pin of the chip U1, and the other end is connected to the ground pin of the chip U1; one end of the inductor L1 is connected to the power input pin of the chip U1, and the other end is connected to the power output pin of the chip U1; the positive electrode of the diode D10 is connected to the inductor L1, and the negative electrode of the diode D10 is connected to the overvoltage protection pin of the chip U1; one end of the capacitor C3 is connected to the negative electrode of the diode D10, and the other end is grounded; one end of the capacitor C4 is connected to the capacitor C3, and the other end is grounded.

[0007] As a preferred technical solution, the LED lamp bead group is composed of LED lamp beads D1~Dn connected in series, where n is greater than or equal to 2.

[0008] As a preferred technical solution, the switch circuit includes a MOS tube Q1 and a resistor R7; the source of the MOS tube Q1 is connected to the capacitor C4, and the drain of the MOS tube Q1 is connected to the positive electrode of the LED lamp bead D1; one end of the resistor R7 is connected to the source of the MOS tube Q1, and the other end is connected to the gate of the MOS tube Q1.

[0009] As a preferred technical solution, the current limiting circuit includes a resistor R3 and a resistor R4; one end of the resistor R3 is connected to the feedback pin of the chip U1, and the other end is grounded; one end of the resistor R4 is connected to the resistor R3, and the other end is connected to the negative pole of the LED lamp bead Dn.

[0010] In a second aspect, the present invention further provides a method for automatically switching screen brightness, comprising: Input instructions to the control circuit; The control circuit outputs a control signal to the corresponding switch circuit according to the instruction. The switch circuit is turned on to light up the corresponding LED lamp bead group to achieve screen brightness adjustment.

[0011] Compared with the prior art, the beneficial effect of the present invention is that: the high and low brightness screen switching interface is displayed through the upper computer interface, and the brightness range controlled by the backlight brightness bar under different interfaces is inconsistent, for example, low brightness, the brightness bar 0-100% represents 0-250nit; high brightness, the brightness bar 0-100% represents 0-700nit. The significance of the screen switching different interfaces for the underlying circuit is to enable the control circuit, the control circuit outputs a control signal to the switch circuit, the switch circuit is turned on, and the LED lamp bead group as the backlight is lit. The more LED lamp bead groups there are, the brighter the screen is. For example, when the upper computer turns on the low brightness function, instruction 1 is a high level (high level enable), and the other instruction signals are all low levels. The control circuit opens switch 1 correspondingly, and the backlight of 1 LED lamp bead group is lit. The backlight of 1 LED lamp bead group can only achieve a maximum brightness value of 0-250nit. The function of the current limiting circuit is to protect the LED lamp bead group. The power supply power is large. When the screen is low brightness, the number of LED lamp bead groups working is small, and the current of each channel is relatively high. The subsequent circuit is protected by controlling the current. The present invention can freely set the screen brightness range, for example, by turning on instruction 1, 0-250nit is achieved, and by turning on instructions 1 and 2, 0-500nit is achieved. By changing the number of LED lamp beads used in the LED lamp bead group, unconventional brightness can be achieved. For example, the number of LED lamp beads in the first LED lamp bead group and the second LED lamp bead group is different, and the number of LED lamp beads in the second LED lamp bead group is half less. According to the above operation, by turning on instructions 1 and 2, 0-375nit can be achieved. In this way, it is necessary to change the current limiting circuit so that the first LED lamp bead group and the second LED lamp bead group can achieve different current inputs. Through the above method, the high and low brightness of the screen can be switched arbitrarily according to needs, and different brightness values ​​can be switched arbitrarily on a single screen. The integration is high, the development and maintenance of the screen itself are convenient, the loss of the product in the process of replacing the screen is reduced, and the applicability and operability of the screen are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of a screen brightness automatic switching device of the present invention.

[0013] Figure 2 It is a circuit diagram of the control circuit and the current limiting circuit of the present invention.

[0014] Figure 3 is a circuit diagram of a switching circuit of the present invention.

[0015] Figure 4 It is a circuit diagram of the LED lamp bead group of the present invention.

[0016] Figure 5 It is a flow chart of a method for automatically switching screen brightness of the present invention.

[0017] The meaning of each number in the figure is: 1-control circuit, 2-switch circuit, 3-current limiting circuit, 4-LED lamp bead group. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-Figure 4 In the first aspect, the present embodiment provides a device for automatically switching screen brightness, including a control circuit 1, a switch circuit 2, a current limiting circuit 3 and an LED lamp bead group 4; There are multiple switch circuits 2, and the multiple switch circuits 2 are connected to the control circuit 1 respectively; there are multiple current limiting circuits 3, and the multiple current limiting circuits 3 are connected to the control circuit 1 respectively; there are multiple LED lamp bead groups 4, and each LED lamp bead group 4 is connected to each switch circuit 2 and each current limiting circuit 3 respectively. The high and low brightness screen switching interface is displayed through the upper computer interface, and the brightness range controlled by the backlight brightness bar under different interfaces is inconsistent. For example, for low brightness, the brightness bar 0-100% represents 0-250nit; for high brightness, the brightness bar 0-100% represents 0-700nit. The significance of the screen switching different interfaces for the underlying circuit is to enable the control circuit 1, and the control circuit 1 outputs a control signal to the switch circuit 2. The switch circuit 2 is turned on to light up the LED lamp bead group 4 as the backlight. The more LED lamp bead groups 4, the brighter the screen. For example, when the host computer turns on the low brightness function, instruction 1 is high level (high level enabled), and the other instruction signals are all low level, the control circuit 1 correspondingly turns on the switch circuit 2, and the backlight of the LED lamp bead group 4 of one channel is lit, and the backlight of the LED lamp bead group 4 of one channel can only achieve a maximum brightness value of 0-250nit. The function of the current limiting circuit 3 is to protect the LED lamp bead group 4. The power supply power is large. When the screen is at low brightness, the number of LED lamp bead groups 4 working is small, and the current of each channel is relatively high, and the subsequent circuit is protected by controlling the current. The present invention can freely set the screen brightness range, for example, turn on instruction 1 to achieve 0-250nit, turn on instructions 1 and 2 to achieve 0-500nit. By changing the number of LED lamp beads used in the LED lamp bead group 4, unconventional brightness can be achieved. For example, the number of LED lamp beads in the first LED lamp bead group 4 and the second LED lamp bead group 4 is different, and the number of LED lamp beads in the second LED lamp bead group 4 is half less. According to the above operation, opening instructions 1 and 2 can achieve 0-375nit. In this way, it is necessary to change the current limiting circuit 3 so that the first LED lamp bead group 4 and the second LED lamp bead group 4 can achieve different current inputs. Through the above method, the high and low brightness of the screen can be switched arbitrarily as needed, and different brightness values ​​can be switched arbitrarily on a single screen. It has high integration, is convenient for the development and maintenance of the screen itself, reduces the loss of the product in the process of replacing the screen, and improves the applicability and operability of the screen.

[0020] In this embodiment, the control circuit includes a chip U1, a capacitor C1, a capacitor C2, a resistor R2, an inductor L1, a diode D10, a capacitor C3 and a capacitor C4; the ground pin of the chip U1 is grounded; one end of the capacitor C1 is connected to the power input pin of the chip U1, and the other end is grounded; one end of the capacitor C2 is connected to the power input pin of the chip U1, and the other end is grounded; one end of the resistor R2 is connected to the enable pin of the chip U1, and the other end is connected to the ground pin of the chip U1; one end of the inductor L1 is connected to the power input pin of the chip U1, and the other end is connected to the power output pin of the chip U1; the positive electrode of the diode D10 is connected to the inductor L1, and the negative electrode of the diode D10 is connected to the overvoltage protection pin of the chip U1; one end of the capacitor C3 is connected to the negative electrode of the diode D10, and the other end is grounded; one end of the capacitor C4 is connected to the capacitor C3, and the other end is grounded. One end of the capacitor C1 is connected to the power supply VCC. When the enable EN1 is at a low level, the chip U1 does not work. When the enable EN1 is at a high level, the chip U1 works, the power supply VCC is boosted through the chip U1, and the current is supplied to the switch circuit 2.

[0021] In this embodiment, the LED lamp bead group 4 is composed of LED lamp beads D1~Dn connected in series, where n is greater than or equal to 2. The positive pole of the LED lamp bead is connected to the negative pole of the adjacent LED lamp bead, the negative pole of LED1 is connected to the positive pole of LED lamp bead 2, and the negative pole of LED lamp bead 2 is connected to the positive pole of LED lamp bead 3. In this connection mode, until the negative pole of LED lamp bead n-1 is connected to the positive pole of LED lamp bead n, the number of n can be set according to demand, so that each LED lamp bead group 4 has a different number of LED lamp beads, thereby achieving a larger screen brightness adjustment range.

[0022] In this embodiment, the switch circuit 2 includes a MOS tube Q1 and a resistor R7; the source of the MOS tube Q1 is connected to the capacitor C4, and the drain of the MOS tube Q1 is connected to the positive electrode of the LED lamp bead D1; one end of the resistor R7 is connected to the source of the MOS tube Q1, and the other end is connected to the gate of the MOS tube Q1. When EN2 is a high-level signal, the MOS tube Q1 is turned off, and the current at the control circuit 1 end cannot reach the LED lamp bead group 4 at the rear end. When EN2 is a low-level signal, the MOS tube Q1 is turned on, and the current at the control circuit 1 end passes through the MOS tube Q1 to reach the LED lamp bead group 4, and the current flows through the LED lamp bead group 4 of the LED lamp beads D1~Dn, lighting the LED lamp beads D1~Dn.

[0023] In this embodiment, the current limiting circuit 3 includes a resistor R3 and a resistor R4; one end of the resistor R3 is connected to the feedback pin of the chip U1, and the other end is grounded; one end of the resistor R4 is connected to the resistor R3, and the other end is connected to the negative electrode of the LED lamp bead Dn. The resistor R3 and the resistor R4 are used as the current limiting circuit 3, and the current flowing through the LED lamp bead group 4 is changed by adjusting the resistance values ​​of the resistor R3 and the resistor R4.

[0024] The present invention discloses an automatic screen brightness switching device, wherein the chip U1 adopts a boost converter of model SY7201ABC, the chip U1 pin 1 is connected to the output end of the inductor L1, and is a power output pin; the chip pin 2 is connected to GND, and is a ground pin; the chip pin 3 is connected to resistors R3 and R4, and is a feedback pin, which receives resistor voltage feedback and is used to adjust the output current; the chip pin 4 is connected to the control end, and is an enable pin, which is used to control the start and shut down of the chip U1. The chip pin 5 is connected to the output power end, and is an overvoltage protection pin, which is used to detect whether the output voltage exceeds the protection range of the chip U1; the chip pin 6 is connected to the input end of the inductor L1, and is a power input pin. The high and low brightness screen switching interface is displayed through the upper computer interface, and the brightness range controlled by the backlight brightness bar in different interfaces is inconsistent. For example, for low brightness, the brightness bar 0-100% represents 0-250nit; for high brightness, the brightness bar 0-100% represents 0-700nit. The screen switches to different interfaces. The significance for the bottom circuit is to enable the control circuit 1. The control circuit 1 outputs a control signal to the switch circuit 2. The switch circuit 2 is turned on to light up the LED lamp bead group 4 as the backlight. The more LED lamp bead groups 4 there are, the brighter the screen is. For example, when the host computer turns on the low brightness function, when the enable EN1 is low, the chip U1 does not work. When the enable EN1 is high, the chip U1 works, the power supply VCC is boosted through the chip U1, and the current is given to the switch circuit 2; when EN2 is a high signal, the MOS tube Q1 is turned off, and the current at the control circuit 1 end cannot reach the LED lamp bead group 4 at the back end. When EN2 is a low signal, the MOS tube Q1 is turned on, and the current at the control circuit 1 end passes through the MOS tube Q1 to reach the LED lamp bead group 4. The current flows through the LED lamp bead group 4 of LED lamp beads D1~Dn, and the LED lamp beads D1~Dn are lit. By adjusting the resistance values ​​of the resistor R3 and the resistor R4, the current flowing through the LED lamp bead group 4 is changed. The power supply is relatively large. When the screen is at low brightness, the number of LED lamp bead groups 4 working is small, and the current of each path is relatively high. The subsequent circuit is protected by controlling the current. The present invention can freely set the screen brightness range. For example, by turning on instruction 1, 0-250nit is achieved, and by turning on instructions 1 and 2, 0-500nit is achieved. By changing the number of LED lamp beads used in the LED lamp bead group 4, unconventional brightness can be achieved. For example, the number of LED lamp beads in the first LED lamp bead group 4 and the second LED lamp bead group 4 is different, and the number of LED lamp beads in the second LED lamp bead group 4 is half less. According to the above operation, by turning on instructions 1 and 2, 0-375nit can be achieved. In this way, it is necessary to change the current limiting circuit 3 so that the first LED lamp bead group 4 and the second LED lamp bead group 4 can achieve different current inputs.Through the above method, the screen brightness can be switched arbitrarily according to needs, so that a single screen can switch different brightness values ​​arbitrarily. It has high integration, is convenient for the development and maintenance of the screen itself, reduces the loss of the product during the screen replacement process, and improves the applicability and operability of the screen.

[0025] See also Figure 5 In a second aspect, the present invention further provides a method for automatically switching screen brightness, comprising: S101 inputs instructions to the control circuit 1; S102 control circuit 1 outputs a control signal to the corresponding switch circuit 2 according to the instruction, and the switch circuit 2 is turned on to light up the corresponding LED lamp bead group 4 to achieve screen brightness adjustment.

[0026] In the embodiment of the present invention, the high and low brightness screen switching interface is displayed through the upper computer interface, and the brightness range controlled by the backlight brightness bar under different interfaces is inconsistent. For example, for low brightness, the brightness bar 0-100% represents 0-250nit; for high brightness, the brightness bar 0-100% represents 0-700nit. The significance of the screen switching different interfaces for the underlying circuit is to enable the control circuit 1, and the control circuit 1 outputs a control signal to the switch circuit 2. The switch circuit 2 is turned on to light up the LED lamp bead group 4 as the backlight. The more LED lamp bead groups 4, the brighter the screen. For example, when the upper computer turns on the low brightness function, instruction 1 is high level (high level enable), and the other instruction signals are all low level. The control circuit 1 corresponds to turning on switch 1, and the backlight of the LED lamp bead group 4 of 1 channel is lit. The backlight of the LED lamp bead group 4 of 1 channel can only achieve a maximum brightness value of 0-250nit. The function of the current limiting circuit 3 is to protect the LED lamp bead group 4. The power supply power is relatively large. When the screen is at low brightness, the number of LED lamp bead groups 4 working is small, and the current of each path is relatively high. The subsequent circuit is protected by controlling the current. The present invention can freely set the screen brightness range. For example, by turning on instruction 1, 0-250nit is achieved, and by turning on instructions 1 and 2, 0-500nit is achieved. By changing the number of LED lamp beads used in the LED lamp bead group 4, unconventional brightness can be achieved. For example, the number of LED lamp beads in the first LED lamp bead group 4 and the second LED lamp bead group 4 is different, and the number of LED lamp beads in the second LED lamp bead group 4 is half less. According to the above operation, by turning on instructions 1 and 2, 0-375nit can be achieved. In this way, it is necessary to change the current limiting circuit 3 so that the first LED lamp bead group 4 and the second LED lamp bead group 4 can achieve different current inputs. Through the above method, the screen brightness can be switched arbitrarily according to needs, so that a single screen can switch different brightness values ​​arbitrarily. It has high integration, is convenient for the development and maintenance of the screen itself, reduces the loss of the product during the screen replacement process, and improves the applicability and operability of the screen.

[0027] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only preferred examples of the present invention, and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A device for automatically switching screen brightness, characterized in that: It includes a control circuit, a switch circuit, a current limiting circuit and an LED lamp bead group; There are multiple switch circuits, and the multiple switch circuits are respectively connected to the control circuit; there are multiple current limiting circuits, and the multiple current limiting circuits are respectively connected to the control circuit; there are multiple LED lamp bead groups, and each LED lamp bead group is respectively connected to each switch circuit and respectively connected to each current limiting circuit.

2. A screen brightness automatic switching device as claimed in claim 1, characterized in that: The control circuit includes a chip U1, a capacitor C1, a capacitor C2, a resistor R2, an inductor L1, a diode D10, a capacitor C3 and a capacitor C4; the ground pin of the chip U1 is grounded; one end of the capacitor C1 is connected to the power input pin of the chip U1, and the other end is grounded; one end of the capacitor C2 is connected to the power input pin of the chip U1, and the other end is grounded; one end of the resistor R2 is connected to the enable pin of the chip U1, and the other end is connected to the ground pin of the chip U1; one end of the inductor L1 is connected to the power input pin of the chip U1, and the other end is connected to the power output pin of the chip U1; the positive electrode of the diode D10 is connected to the inductor L1, and the negative electrode of the diode D10 is connected to the overvoltage protection pin of the chip U1; one end of the capacitor C3 is connected to the negative electrode of the diode D10, and the other end is grounded; one end of the capacitor C4 is connected to the capacitor C3, and the other end is grounded.

3. A screen brightness automatic switching device as claimed in claim 2, characterized in that: The LED lamp bead group is composed of LED lamp beads D1~Dn connected in series, where n is greater than or equal to 2.

4. A screen brightness automatic switching device as claimed in claim 3, characterized in that: The switch circuit includes a MOS tube Q1 and a resistor R7; the source of the MOS tube Q1 is connected to the capacitor C4, and the drain of the MOS tube Q1 is connected to the positive electrode of the LED lamp bead D1; one end of the resistor R7 is connected to the source of the MOS tube Q1, and the other end is connected to the gate of the MOS tube Q1.

5. A screen brightness automatic switching device as claimed in claim 4, characterized in that: The current limiting circuit includes a resistor R3 and a resistor R4; one end of the resistor R3 is connected to the feedback pin of the chip U1, and the other end is grounded; one end of the resistor R4 is connected to the resistor R3, and the other end is connected to the negative electrode of the LED lamp bead Dn.

6. A method for automatically switching screen brightness, applied to a device for automatically switching screen brightness as claimed in any one of claims 1 to 5, characterized in that: include: Input instructions to the control circuit; The control circuit outputs a control signal to the corresponding switch circuit according to the instruction. The switch circuit is turned on to light up the corresponding LED lamp bead group to achieve screen brightness adjustment.

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