TWI700534B - Liquid crystal display with mechanism for detecting short circuit of light-emitting module - Google Patents

Abstract

The present invention relates to a liquid crystal display with a mechanism for detecting a short circuit of a light-emitting module. It is mainly provided with a short-circuit detection module between a light-emitting module and a driving device to form a power circuit; the short-circuit detection The module is electrically connected to the light emitting module and the driving device, and detects a set of current signals flowing through. The short-circuit detection module determines the power supply between the driving device and the light emitting module according to the set of current signals Whether a short-circuit condition occurs in the circuit is used to determine whether to implement a protection mechanism. By detecting the short-circuit of the light-emitting module in real time and executing the protection mechanism, the goal of improving safety is achieved.

Description

Liquid crystal display with mechanism for detecting short circuit of light-emitting module

The present invention relates to a liquid crystal display, in particular to a liquid crystal display with a mechanism for detecting the short circuit of a light-emitting module.

Liquid crystal displays are one of the commonly used displays, which are widely used in companies, government agencies, and even home life. The liquid crystal displays further include light-emitting modules. During the assembling process of the liquid crystal display, due to the complicated mechanism and circuit arrangement, the light-emitting module and the metal member are often contacted unexpectedly and short-circuited.

In the prior art, there is a conventional light-emitting module driving structure of a liquid crystal display. Please refer to FIG. 5, which includes a driving device 10 and a light-emitting module 20. Both ends of the light-emitting module 20 and the zone moving device 10 Electrically connected, the driving device 10 is used to provide an output current I _O to the light-emitting module 20, and receive an input current I _I returned by the light-emitting module 20, and at the same time determine whether or not according to the state of the input current I _I Increase the output current I _O. In the case of a short circuit, as shown in Figure 5, the leakage current I _L flows out of an unexpected short-circuit path, resulting in a decrease in the input current I _I , and when the magnitude of the decrease in the input current I _I is too large, the driving device 10 will increase the output current I _O to increase the amount of input current I _I. Excessive output current I _O will cause the fuse of the driving device 10 to blow and the output will be interrupted. As a result, the LCD is determined to have a short-circuit path. It needs further overhaul.

However, the driving structure of the light-emitting module of the liquid crystal display in the prior art is a high-current protection mechanism. Therefore, if the leakage current _{IL is} not enough to blow the fuse during the assembly stage, the short-circuit situation cannot be detected immediately by the high-current protection mechanism. , Causing the LCD to be misjudged as good and shipped. In addition to the fact that the liquid crystal display with a short-circuit condition may blow the fuse due to the increase of the leakage current I _L , so that the light-emitting module 20 cannot emit light normally, resulting in a poor user experience, it is more likely to have a leakage current I _L. Safety issues (for example: circuit damage, overheating and causing fire).

Therefore, the existing technology does need to provide a better improvement plan.

In view of the above-mentioned shortcomings of the prior art, the main purpose of the present invention is to provide a liquid crystal display with a mechanism for detecting the short circuit of the light-emitting module, which can not only detect the state of the power circuit of the liquid crystal display, but also implement a corresponding protection mechanism. This improves the safety of the LCD display.

The main technical means adopted to achieve the above objective is that the aforementioned liquid crystal display with a mechanism for detecting the short circuit of the light-emitting module includes: a light-emitting module; a driving device for driving the light-emitting module; and a short-circuit detection module , Electrically connected between the light-emitting module and the driving device to form a power circuit; wherein the short-circuit detection module detects a group of current signals flowing through the power circuit, and judges the group of current signals according to the group of current signals Whether a short-circuit state occurs in the power circuit to determine whether to implement a protection mechanism.

With the above structure, the liquid crystal display includes the driving device for driving the light-emitting module, and the short-circuit detection module is electrically connected between the light-emitting module and the driving device to form the power circuit, and the short-circuit detection The module is used to detect a set of current signals flowing through the power circuit, and determine whether the power circuit has the short-circuit state according to the set of current signals, to determine whether to implement the protection mechanism, thereby detecting the power of the LCD The state of the loop, and implement the corresponding protection mechanism to achieve the purpose of improving the safety of the LCD.

10: Drive

20: Light-emitting module

100: Drive

200: light emitting module

210: LED light emitting unit

300: Short circuit detection module

311: The first detection unit

312: second detection unit

313: Third Detection Unit

314: Fourth Detection Unit

315: Fifth Detection Unit

316: Sixth Detection Unit

320: Microcontroller

330: Protection Module

1000: LCD display

A1, A2, A3, A4, A5, A6: amplifier

S1, S2, S3, S4, S5, S6: sensors

I ₁ : first current

I ₂ : second current

I _I : Input current

I _O : output current

I _L , I _X , I _Y , I _Z : Leakage current

O1: The first output

O2: second output

O3: third output

O4: Fourth output

O5: Fifth output terminal

O6: sixth output

FIG. 1 is a block diagram of a first preferred embodiment of a liquid crystal display with a mechanism for detecting short circuit of light-emitting modules of the present invention.

2 is a block diagram of a second preferred embodiment of a liquid crystal display with a mechanism for detecting short circuit of light-emitting modules according to the present invention.

3 is a block diagram of a third preferred embodiment of a liquid crystal display with a mechanism for detecting short circuit of light-emitting modules according to the present invention.

4 is a block diagram of the structure of the fourth preferred embodiment of the liquid crystal display with a mechanism for detecting the short circuit of the light-emitting module of the present invention.

FIG. 5 is a driving structure of a light-emitting module of a conventional liquid crystal display in the prior art.

Regarding the first preferred embodiment of the liquid crystal display with the mechanism for detecting the short circuit of the light-emitting module of the present invention, please refer to FIG. 1, which includes a driving device 100, a light-emitting module 200, and a short-circuit detection module 300. The driving device 100 is used to generate a first current I ₁ and receive a second current I ₂ , and control the current value I ₁ of the first current according to the current value change of the second current I ₂ , and the first current I _{1 is} used to drive the light emitting module 200. The light emitting module 200 is driven to emit light by the first current I ₁ and outputs the second current I _2. The short circuit detection module 300 is electrically connected to the light emitting module 200 And a power circuit is formed between the driving device 100, and a set of current signals flowing through the power circuit is detected, and based on the set of current signals, it is determined whether the power circuit has a short-circuit state, so as to determine whether to implement a protection mechanism .

Regarding the second preferred embodiment of the present invention, please refer to FIG. 2. The main technical content of this preferred embodiment is roughly the same as that of the previous preferred embodiment, but the short-circuit detection module in this preferred embodiment The set 300 further includes a first detection unit 311, a second detection unit 312, and a microcontroller 320. The first detection unit 311 is electrically connected to the current output terminal of the driving device 100 and the light emitting module 200 Between one end of the drive device 100 is used to detect the current signal flowing into the light emitting module 200 from the driving device 100 and output a first current signal accordingly. The second detection unit 312 is electrically connected to the current of the driving device 100 Between the input end and the other end of the light-emitting module 200, it is used to detect the current signal flowing from the light-emitting module 200 into the driving device 100 and output a second current signal accordingly. The microcontroller 320 and the The first detection unit 311 and the second detection unit 312 are electrically connected to receive the first current signal and the second current signal, and perform processing operations on the first current signal and the second current signal to generate Corresponding drive state information, and determine whether the short-circuit state occurs according to the drive state information to determine whether to implement the protection mechanism; in the preferred embodiment, the light-emitting module 200 can emit light by one or multiple LEDs connected in series The unit 210 is composed.

In the preferred embodiment, the microcontroller 320 can be used to obtain the difference between the first current signal and the second current signal, and determine whether the difference (that is, the driving state information) is equal to or greater than one The preset threshold value. When the microcontroller 320 determines that the difference is greater than the preset threshold value, it means that the first detection unit 311 and the second detection unit 312 have an unexpected short-circuit state (as shown in FIG. 2 The marked leakage current I _X ), the microcontroller 320 will implement the protection mechanism.

Since a part of the current output by the light-emitting module 200 flows out through an unexpected short-circuit path to become the leakage current I _X (approximately equal to the difference), the second current signal is smaller than the leakage current I _X due to the leakage current I _X The first current signal, therefore, by detecting and judging the difference, it can be determined whether the short-circuit state occurs.

In this preferred embodiment, the first detection unit 311 further includes a sensor S1 and an amplifier A1, and the sensor S1 is connected to the current output terminal of the driving device 100 and the light emitting module. Between one end of the group 200, it is used to detect the current signal flowing into the light-emitting module 200 from the driving device 100, and the detected current signal is transmitted to the amplifier A1 for amplification, and is output by a first output of the amplifier A1 The terminal O1 outputs the first current signal. The second detection unit 312 has the same structure as the first detection unit 311, and includes a sensor S2, an amplifier A2 electrically connected to each other, and a second output terminal O2 for outputting the second current signal, Therefore, I will not repeat them below.

Regarding the third preferred embodiment of the present invention, please refer to FIG. 3. The main technical content of this preferred embodiment is roughly the same as that of the previous preferred embodiment, but the short-circuit detection module in this preferred embodiment 300 further includes a protection module 330 electrically connected to the microcontroller 320. When the microcontroller 320 executes the protection mechanism, the microcontroller 320 sends a control signal to the protection module 330 to enable the protection module The group 330 immediately releases the short-circuit state to avoid the safety problem caused by the leakage current I _X. In the present preferred embodiment, the protection module 330 can be implemented by components with warning functions such as warning lights, speakers, etc. The microcontroller 320 sends the control signal to the protection module 330 according to the driving state information In order to drive the protection module 330 to execute the protection mechanism, the protection module 330 will warn by means of light, flashing or warning sound effects. In this preferred embodiment, the protection module 330 may be implemented by a light-emitting module controller, which is used to control the light-emitting state of the light-emitting module 200 (for example, control the first Current I ₁ ), the microcontroller 320 sends the control signal to the protection module 330 according to the driving state information to drive the protection module 330 to execute the protection mechanism, and the protection module 330 enables the light emitting module 200 Warn by flashing or turning off. Thereby, the liquid crystal display 1000 of the present invention can issue a warning when there is a short circuit state, so the liquid crystal display 1000 can be repaired immediately. This action can not only release the short circuit state immediately before the leakage current I _{X is} too large, but also effectively avoid the leakage. Safety problems caused by excessive current I _X.

Regarding the fourth preferred embodiment of the present invention, please refer to FIG. 4. The main technical content of this preferred embodiment is roughly the same as that of the second preferred embodiment. However, in this preferred embodiment, the short-circuit detection The module 300 further includes a third detection unit 313, a fourth detection unit 314, a fifth detection unit 315, and a sixth detection unit 316. The number of detection units of the present invention can be adjusted according to requirements Adjustment, and the present invention is not limited to the number shown in the specification. The third detecting unit 313 and the fifth detecting unit 315 are connected in series between the first detecting unit 311 and one end of the light emitting module 200, the fourth detecting unit 314 and the sixth detecting unit 314 The unit 316 is connected in series between the second detecting unit 312 and the other end of the light emitting module 200, and the third output terminal O3 of the third detecting unit 313 and the fourth detecting unit 314 The output terminal O4, the fifth output terminal O5 of the fifth detection unit 315, and the sixth output terminal O6 of the sixth detection unit 316 are electrically connected to the microcontroller 320. The third detection unit 313, the The four detection unit 314, the fifth detection unit 315, and the sixth detection unit 316 are used to transmit the detected third current signal, fourth current signal, fifth current signal, and sixth current signal to the micro Controller 320. In this way, the short-circuit state of the liquid crystal display 1000 and the location where it occurs can be detected more precisely, so the short-circuit state can be quickly and accurately eliminated during maintenance.

For example, the microcontroller 320 can determine whether there is a leakage current I _Z between the first detection unit 311 and the third detection unit 313 by using the first current signal and the third current signal. The current loop; the microcontroller 320 can determine by the fourth current signal and the sixth current signal whether a leakage current I _Y occurs between the fourth detection unit 314 and the sixth detection unit 316 The current loop; the microcontroller 320 can determine whether there is a leakage current I _X between the fifth detection unit 315 and the sixth detection unit 316 by the fifth current signal and the sixth current signal的current loop.

In summary, the present invention is mainly based on the above-mentioned structure, and the short-circuit detection module 300 detects a set of current signals flowing through, and uses the set of current signals to determine whether the liquid crystal display 1000 is The state of the power supply circuit, and implement the corresponding protection mechanism to achieve the purpose of improving the safety of the LCD.

100: Drive

200: light emitting module

300: Short circuit detection module

1000: LCD display

I1: first current

I2: second current

Claims (7)

A liquid crystal display with a mechanism for detecting a short circuit of a light-emitting module includes: a light-emitting module; a driving device for driving the light-emitting module; and a short-circuit detection module electrically connected to the light-emitting module and the light-emitting module A power circuit is formed between the driving devices; wherein the short-circuit detection module detects a set of current signals flowing through the power circuit, and determines whether the power circuit has a short-circuit state according to the set of current signals to determine Whether to implement a protection mechanism, wherein the short-circuit detection module includes: a first detection unit electrically connected between the current output terminal of the driving device and one end of the light-emitting module for detecting the driving The device flows into the current signal of the light-emitting module and outputs a first current signal accordingly; a second detection unit is electrically connected between the current input end of the driving device and the other end of the light-emitting module for Detect the current signal flowing from the light-emitting module into the driving device, and output a second current signal accordingly; and a microcontroller, electrically connected to the first detection unit and the second detection unit, for Receive the first current signal and the second current signal, and determine whether the power circuit has the short-circuit state, to determine whether to implement the protection mechanism. The liquid crystal display according to claim 1, wherein the first detection unit or the second detection unit includes a sensor and an amplifier, and the sensor is electrically connected between the driving device and the light-emitting module , Used to sense the current signal flowing through and send it to the amplifier to output the first current signal or the second current signal. According to the liquid crystal display of claim 1, the short-circuit detection module further includes: A third detection unit is used to detect the current signal and output a third current signal to the microcontroller; a fourth detection unit is used to detect the current signal and output a fourth current signal to the microcontroller Microcontroller; a fifth detection unit for detecting current signals and outputting a fifth current signal to the microcontroller; and a sixth detection unit for detecting current signals and outputting a first Six current signals are sent to the microcontroller, wherein the third detecting unit is electrically connected between the first detecting unit and the fifth detecting unit, and the fourth detecting unit is electrically connected to the second detecting unit Unit and the sixth detecting unit, the fifth detecting unit is electrically connected between the third detecting unit and one end of the light-emitting module, and the sixth detecting unit is electrically connected to the fourth detecting Between the unit and the other end of the light-emitting module. According to the liquid crystal display according to claim 1, the short-circuit detection module further includes a protection module, which is electrically connected to the microcontroller. In the liquid crystal display according to claim 4, the protection module is a light-emitting module controller for controlling the light-emitting state of the light-emitting module. According to the liquid crystal display according to claim 4, the protective module is a warning light or a speaker. According to the liquid crystal display of claim 1, the light-emitting module includes one or more LED light-emitting units.

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