CN110197648B - Display device and driving method thereof - Google Patents
Display device and driving method thereof Download PDFInfo
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- CN110197648B CN110197648B CN201910432016.2A CN201910432016A CN110197648B CN 110197648 B CN110197648 B CN 110197648B CN 201910432016 A CN201910432016 A CN 201910432016A CN 110197648 B CN110197648 B CN 110197648B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
Abstract
The invention discloses a display device and a driving method thereof, and relates to the technical field of display. In the embodiment of the invention, the current temperature of the display device can be detected through the temperature detection module, and then the detection result is sent to the backlight control circuit, the backlight control circuit can judge whether the current temperature is greater than the preset temperature threshold value or not according to the detection result, if so, the display device is in a high-temperature state currently, so that a second temperature detection signal is sent to the driving mainboard, the driving mainboard controls the backlight driving circuit to apply voltage to the backlight source step by step, the interference of inrush is dispersed, the situation that the maximum current in the backlight source is greater than the self-protection current is avoided, the backlight source can still be normally lightened under the high-temperature condition, and the display function of the display device can still be realized under the high temperature condition.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display device and a driving method thereof.
Background
The lcd is a non-self-luminous device, and needs a backlight module to provide a backlight source to realize the display function. The backlight module generally includes a backlight driving circuit and a backlight source, and the driving main board can control the backlight driving circuit to supply voltage to the backlight source according to the requirements of customers, so as to light the backlight source, and to realize the display function by matching with the liquid crystal display panel.
In the lighting process of the backlight source (hereinafter referred to as the "power-on process"), the current in the backlight source is increased instantaneously due to the inrush current, and if the backlight source is started at normal temperature, the backlight source can be smoothly lighted because the maximum current in the backlight source is smaller than the set self-protection current. If the display is started at a high temperature, the maximum current of the backlight source is possibly larger than the self-protection current, so that the backlight source is self-protected and stops working, the backlight source cannot be lightened at the moment, and the display cannot realize the display function.
Therefore, in high-temperature startup, how to ensure normal lighting of the backlight source and ensure normal display function of the display is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The embodiment of the invention provides a display device and a driving method thereof, which are used for ensuring the normal lighting of a backlight source and the normal display function of a display under the condition of high temperature.
In a first aspect, an embodiment of the present invention provides a display device, including: the backlight driving circuit comprises a driving mainboard, a backlight driving circuit, a backlight control circuit, a backlight source and a temperature detection module;
the temperature detection module is electrically connected with the backlight control circuit and is used for:
acquiring the current temperature of the display device, and sending a first temperature detection signal to the backlight control circuit;
the backlight control circuit is also electrically connected with the driving main board and is used for:
judging whether the current temperature is greater than a preset temperature threshold value or not according to the first temperature detection signal;
if yes, sending a second temperature detection signal to the driving main board;
if not, sending a second diethyl temperature detection signal to the driving main board;
the backlight driving circuit is connected between the driving main board and the backlight source, and the driving main board is used for:
when the second temperature detection signal is received, controlling the backlight driving circuit to apply voltage to the backlight source step by step so that the total voltage applied to the backlight source is a preset voltage;
and when the second temperature detection signal is received, controlling the backlight driving circuit to directly apply the preset voltage to the backlight source.
In a second aspect, an embodiment of the present invention provides a driving method for a display device, where the display device is configured as the display device provided in the embodiment of the present invention, and the driving method includes:
the driving main board executes the following processes:
when a second temperature detection signal sent by a backlight control circuit is received, controlling a backlight driving circuit to apply voltage to a backlight source step by step so as to enable the total voltage applied to the backlight source to be a preset voltage;
when a second temperature detection signal sent by the backlight control circuit is received, the backlight driving circuit is controlled to directly apply the preset voltage to the backlight source;
wherein the second temperature detection signal is: the backlight control circuit judges a signal sent after the current temperature of the display device is greater than a preset temperature threshold value according to a first temperature detection signal sent by a temperature detection module, wherein the second temperature detection signal is as follows: the backlight control circuit judges that the current temperature of the display device is not greater than the signal sent after the preset temperature threshold value according to the first temperature detection signal sent by the temperature detection module, wherein the first temperature detection signal is as follows: and the temperature detection module acquires the current temperature of the display device and then sends the signal.
The invention has the following beneficial effects:
in the display device and the driving method thereof provided by the embodiment of the invention, the current temperature of the display device can be detected through the temperature detection module, and then the detection result is sent to the backlight control circuit, the backlight control circuit can judge whether the current temperature is greater than the preset temperature threshold value according to the detection result, if so, the display device is currently in a high-temperature state, and therefore, a second temperature detection signal is sent to the driving mainboard, so that the driving mainboard controls the backlight driving circuit to apply voltage to the backlight source step by step, the situation that the maximum current in the backlight source is greater than the self-protection current is avoided, and if not, the display device is not currently in the high-temperature state, and therefore, the second temperature detection signal is sent to the driving mainboard, so that the driving mainboard controls the backlight driving circuit to directly apply the preset voltage to the backlight source, and therefore, the backlight source can be normally lightened no matter whether the display device is in, and then guarantee that display device still can realize the display function under high temperature, can also protect the backlight simultaneously and avoid damaging.
Drawings
Fig. 1 is a schematic structural diagram of a display device provided in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a process for applying voltages to a backlight in stages according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a backlight control circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another backlight control circuit provided in the embodiment of the present invention;
fig. 5 is a schematic structural diagram of a connection relationship between a backlight source and a driving main board provided in the embodiment of the present invention;
fig. 6 is a schematic partial structure diagram of a backlight module according to an embodiment of the present invention;
FIG. 7 is a schematic view of a partial structure of another backlight module according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another display device provided in the embodiment of the present invention;
fig. 9 is a flowchart of a method of a backlight driving process according to an embodiment of the present invention.
The backlight module comprises a liquid crystal display panel 1, a backlight module 2, an array substrate 1a, an opposite substrate 1b, a liquid crystal 1C, a temperature detection module 10, a backlight control circuit 20, a driving main board 30, a backlight driving circuit 40, a backlight source 50, a flexible circuit board 53 and 60, a light-emitting element 51, a light guide plate 52, an iron frame 54, a D-comparator 11, a thermistor R0, a resistor C1, a first capacitor C2, a second capacitor C3, a third capacitor C4 and a fourth capacitor C4.
Detailed Description
A detailed description will be given below of a specific embodiment of a display device and a driving method thereof according to an embodiment of the present invention with reference to the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a display device, and a schematic structural diagram of the display device shown in fig. 1 may include: the driving circuit board 30, the backlight driving circuit 40, the backlight control circuit 20, the backlight source 50, and the temperature detecting module 10;
the temperature detection module 10 is electrically connected to the backlight control circuit 20, and is configured to:
collecting the current temperature of the display device, and sending a first temperature detection signal to the backlight control circuit 20;
the backlight control circuit 20 is also electrically connected to the driving main board 30 for:
judging whether the current temperature is greater than a preset temperature threshold value or not according to the first temperature detection signal;
if yes, sending a second temperature detection signal to the driving main board 30;
if not, sending a second temperature detection signal to the driving main board 30;
the backlight driving circuit 40 is connected between the driving main board 30 and the backlight source 50, and the driving main board 30 is configured to:
when receiving the second temperature detection signal, controlling the backlight driving circuit 40 to apply a voltage to the backlight 50 step by step so that the total voltage applied to the backlight 50 is a preset voltage;
and when receiving the second temperature detection signal, controlling the backlight driving circuit 40 to directly apply a preset voltage to the backlight source 50.
In the embodiment of the present invention, the temperature detection module 10 can detect the current temperature of the display device, and then send the detection result to the backlight control circuit 20, the backlight control circuit 20 can determine whether the current temperature is greater than the preset temperature threshold according to the detection result, if so, it indicates that the display device is currently in a high temperature state, so a second temperature detection signal is sent to the driving motherboard 30, so that the driving motherboard 30 controls the backlight driving circuit 40 to apply a voltage to the backlight source 50 step by step, and the situation that the maximum current in the backlight source 50 is greater than the self-protection current is avoided; if not, it indicates that the display device is not currently in a high temperature state, so that the second temperature detection signal is sent to the driving main board 30, so that the driving main board 30 controls the backlight driving circuit 40 to directly apply the preset voltage to the backlight source 50. Therefore, the backlight source 50 can be normally lightened no matter whether the display device is at a high temperature or not, and the display function of the display device can still be realized at the high temperature; meanwhile, under the condition of high temperature, the interference of inrush current is dispersed by applying voltage to the backlight source 50 step by step, so that the condition that the maximum current in the backlight source 50 is larger than the self-protection current can be avoided, and the backlight source 50 can be protected from being damaged.
Optionally, in the embodiment of the present invention, the driving main board 30 is specifically configured to:
when receiving the second temperature detection signal, controlling the backlight driving circuit 40 to apply a voltage to the backlight 50 for N times, so that the total voltage applied to the backlight 50 is a preset voltage; wherein the maximum current in the backlight 50 is not greater than a preset self-protection current each time a voltage is applied to the backlight 50, and N is an integer greater than 1.
That is, when the driving main board 30 receives the second temperature detection signal, it can be determined that the display device is currently in a high temperature state, so that in order to avoid that the maximum current in the backlight 50 is greater than the self-protection current due to the inrush current, the inrush current is dispersed, so that the backlight driving circuit 40 does not directly output the preset voltage to the backlight 50, but gradually applies the voltage, or applies the voltage in segments, and the interference of the inrush current is dispersed, thereby ensuring that the backlight 50 can be smoothly turned on.
The voltages applied to the backlight 50 in N times can be understood as intermediate voltages applied to the backlight 50 in N times, and the sum of the intermediate voltages applied in N times is the preset voltage, so that the luminance of the backlight 50 after the voltages are applied in N times is ensured to meet the luminance requirement, which is the same as the luminance of the backlight 50 after the voltages are directly applied to the backlight 50, and when the display requirement is met, whether the display device is at a high temperature currently can be ensured, and the backlight luminance provided by the backlight 50 is consistent, thereby being beneficial to improving the display stability.
Optionally, in the embodiment of the present invention, for the manner of applying the voltage step by step, the voltage applied to the backlight 50 each time may be different, or the current increase value in the backlight 50 is different after applying the voltage to the backlight 50 each time, so that the flexibility of driving the backlight 50 is improved, and the driving process may be designed according to actual needs to meet the requirements of various scenes.
Of course, in the embodiment of the present invention, for the way of applying the voltage step by step, the voltage applied to the backlight 50 each time may be the same, or the current increase value in the backlight 50 is the same after applying the voltage to the backlight 50 each time, so that it is convenient to control the voltage applied to the backlight 50 each time, and thus to control and operate the driving of the backlight 50.
Optionally, in the embodiment of the present invention, N may be 2, that is, a voltage is applied to the backlight 50 twice, and the current increase value in the backlight 50 is 0.3 to 0.8 times of the preset current each time the voltage is applied to the backlight 50; wherein, the preset current is: the current in backlight 50 is applied to backlight 50 at a preset voltage.
Of course, the specific value of N is not limited to 2, and may also be 3, 4, or 5, etc., and may be set according to factors such as the magnitude of inrush current, the magnitude of preset current, and the magnitude of self-protection current, etc., and is not limited herein, and the following example takes N as 2.
For example, as shown in the process diagram of applying voltage to the backlight 50 step by step in fig. 2, when N is 2, the voltage applied to the backlight for the first time is represented by V1 (V1 is not shown in the figure), the current in the backlight increases from zero to I1, the preset current is represented by I0, and I1 is smaller than I0. If Ix is used for representing the self-protection current, after the voltage is applied for the first time, even if inrush 1 current exists, the maximum current I2 in the backlight source is smaller than the self-protection current Ix when the voltage is applied for the first time, so that the self-protection process can not occur during the first time of voltage application, the voltage can be successfully applied to the backlight source, and the backlight source has certain current.
The voltage applied to the backlight for the second time is represented by V2 (not shown in the figure, V2), at this time, the current in the backlight increases from I1 to I0, after the voltage is applied for the second time, although inrush 2 current still exists, the maximum current I3 in the backlight still is smaller than the self-protection current Ix after the voltage is applied to the backlight for the second time, so that the self-protection process does not occur during the second time of applying the voltage, the voltage can be successfully applied to the backlight, the backlight can be smoothly lighted, and the brightness of the backlight meets the brightness requirement.
Further, in the embodiment of the present invention, when the voltage is applied to the backlight 50 in two times, the current increase value in the backlight 50 is 0.5 times the preset current each time the voltage is applied to the backlight 50.
Thus, by applying voltage to the backlight 50 twice, interference of inrush can be dispersed, and problems of complicated operation and long time consumption for lighting the backlight 50 due to more times of applying voltage step by step can be avoided. Moreover, the current increase value in the backlight 50 is 0.5 times of the preset current each time the voltage is applied to the backlight 50, which can simplify the control of the lighting process of the backlight 50, and reduce the operation and driving difficulty while improving the operation efficiency.
In specific implementation, in order to implement the function of the backlight driving circuit 40, in the embodiment of the present invention, as shown in the schematic structural diagram of the backlight control circuit 20 shown in fig. 3, when the backlight control circuit 20 includes a comparator D, the temperature detection module 10 may be connected between a first input terminal of the comparator D and the power signal terminal VCC, and specifically configured to: inputting a voltage signal representing the acquired current temperature to a first input end of a comparator D;
at this time, as shown in fig. 3, a second input terminal of the comparator D is electrically connected to the reference signal terminal Vref, and an output terminal of the comparator D is electrically connected to the driving main board 30 and the power signal terminal VCC, respectively, and the comparator D may be configured to:
judging whether the current temperature is greater than a preset temperature threshold value or not according to the magnitude relation between the voltage signal input by the first input end and the reference signal input by the second input end;
if yes, sending a second temperature detection signal to the driving main board 30;
if not, a second temperature detection signal is sent to the driving main board 30.
Here, the second temperature detection signal sent by the comparator D to the driving main board 30 may be a high level signal, and the second temperature detection signal may be a low level signal, or the second temperature detection signal may be a low level signal, and the second temperature detection signal may be a high level signal.
Taking the second temperature detection signal may be a high level signal, and the second temperature detection signal may be a low level signal as an example, if the voltage of the voltage signal input by the first input terminal of the comparator D is less than or equal to the voltage of the reference signal input by the second input terminal, the comparator D may output a low level signal at this time, which indicates that the current temperature is less than the preset temperature threshold, that is, the display device is not in a high temperature state at present. If the voltage of the voltage signal input by the first input end of the comparator D is greater than the voltage of the reference signal input by the second input end, the comparator D may output a high level signal at this time, which indicates that the current temperature is greater than the preset temperature threshold, i.e., the display device is currently in a high temperature state.
Of course, the specific form of the second temperature detection signal and the second temperature detection signal is not limited to the high-low level signal, and may be other signals capable of distinguishing the two signals, and is not limited herein.
The comparator D may be a comparator with a model LM339, but is not limited thereto, and all of the comparators are within the protection scope of the present invention as long as the comparator can realize the function of the comparator in the embodiment of the present invention.
Specifically, in order to realize the function of the temperature detection module 10, in the embodiment of the present invention, the temperature detection module 10 includes any one of a thermistor (11 shown in fig. 4), a thermal sensor (not shown), and a thermocouple (not shown).
For example, referring to fig. 4, the temperature detecting module 10 includes a thermistor (which may be represented by NTC in fig. 4), the resistance of the thermistor NTC changes when detecting that the temperature of the display device changes, and the second input of the two inputs of the comparator D inputs the reference signal, and the first input is electrically connected to the thermistor NTC, so that when the magnitude relationship between the two inputs changes due to the change of the resistance of the thermistor NTC, the comparator D can determine whether the current temperature is greater than the preset temperature threshold, and accordingly send a corresponding signal to the driving motherboard 30.
Specifically, when the temperature detecting module 10 includes a thermistor, the thermistor may be a positive temperature coefficient thermistor (denoted by PTC), and the resistance of the thermistor increases with the increase of the temperature.
For example, if in a non-high temperature state, the voltage input at the first input terminal of the comparator D is greater than the voltage of the reference signal input at the second input terminal, and a low level signal is output, which indicates that the current temperature is not greater than the preset temperature threshold, the resistance value of the thermistor increases with the increase of the temperature, and accordingly the divided voltage of the thermistor increases, so that the voltage input at the first input terminal of the comparator D gradually decreases until the voltage is less than or equal to the voltage of the reference signal, and the comparator D outputs a high level signal, which indicates that the current temperature is greater than the preset temperature threshold.
Of course, the thermistor may also be a negative temperature coefficient thermistor (NTC), which decreases with increasing temperature.
For example, if in a non-high temperature state, the voltage input by the first input terminal of the comparator D is less than the voltage of the reference signal input by the second input terminal, and a low level signal is output, which indicates that the current temperature is not greater than the preset temperature threshold, the resistance value of the thermistor decreases with the increase of the temperature, and correspondingly, the divided voltage of the thermistor decreases with the increase of the temperature, so that the voltage input by the first input terminal of the comparator D gradually increases until the voltage is greater than the voltage of the reference signal, and the comparator D outputs a high level signal, which indicates that the current temperature is greater than the preset temperature threshold.
Therefore, in practical cases, the type of thermistor used may be a positive temperature coefficient thermistor, or may also be a negative temperature coefficient thermistor, which may be selected and set according to practical cases, and is not limited herein.
Of course, when the temperature detecting module 10 includes any one of the thermal sensor and the thermocouple, the working process after the temperature detecting module is combined with the comparator D is similar to the working process after the thermistor NTC is combined with the comparator D, which can be referred to the above description specifically, and repeated parts are not described again.
Optionally, in order to ensure that the backlight control circuit 20 can work normally and effectively, in the embodiment of the present invention, as shown in the structure of the backlight control circuit 20 shown in fig. 4, the backlight control circuit 20 may further include: the circuit comprises a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4 and a resistor R0 with a fixed resistance value;
the first capacitor C1 and the fourth capacitor C4 are connected in parallel between the ground terminal GND and the power signal terminal VCC;
the second capacitor C2 and the third capacitor C3 are connected in parallel between the ground GND and the second input terminal of the comparator D;
the resistor R0 is connected between the power signal terminal VCC and the output terminal of the comparator D.
In fig. 4, the function of the resistor R0 can be understood as: the voltage dividing resistor prevents the signal output by the comparator D from damaging the driving main board 30, thereby achieving the purpose of protecting the driving main board 30.
The functions of the second capacitor C2 and the third capacitor C3 can be understood as follows: the stability of the potential of the second input terminal of the comparator D is maintained, and the influence of the fluctuation of the potential on the judgment result of whether the current temperature is greater than the preset temperature threshold is avoided, so that the backlight source 50 can be smoothly lighted.
The role of the first capacitor C1 and the fourth capacitor can be understood as: the stability of the potential of the output terminal of the comparator D is maintained to ensure that the comparator D can output a stable potential, so that the driving main board 30 can control the backlight driving circuit 40 according to the signal output by the comparator D.
Specifically, in the embodiment of the present invention, the first capacitor C1 and the second capacitor C2 have a first capacitance value, and the third capacitor C3 and the fourth capacitor C4 have a second capacitance value;
the first capacitance value may be greater than the second capacitance value.
For example, the first capacitance value may be 10 μ F and the second capacitance value may be 0.1 μ F. Of course, the first capacitance value and the second capacitance value are not limited to the above values, and may be other values set according to requirements, which are only illustrated here and are not limited specifically.
In specific implementation, in the embodiment of the present invention, as for the driving main board 30, a Field-Programmable Gate Array (FPGA) may be used to implement (as shown in fig. 4), and through an IIC interface between the FPGA and the backlight driving circuit 40, the driving main board 30 may send a backlight driving program to the backlight driving circuit 40, where the backlight driving program may be understood as a program in which the backlight driving circuit 40 applies a voltage to the backlight source 50 to light the backlight source 50, so as to implement driving control on the backlight source 50.
The driving main board 30 generally stores a correspondence relationship between a signal and a backlight driver in advance, and the driving main board 30 can select the corresponding backlight driver based on the signal transmitted from the backlight control circuit 20 to drive and control the backlight 50.
In specific implementation, in the embodiment of the present invention, when the display device further includes a flexible circuit board 60 electrically connected to the driving main board 30 and the backlight source 50, as shown in fig. 5, both the temperature detection module 10 and the backlight control circuit 20 may be disposed on the flexible circuit board 60, so as to avoid occupying a frame area of the display device, which is beneficial to implementing a narrow frame design of the display device.
Next, a process of driving the backlight 50 to emit light and lighting the backlight 50 with the configuration shown in fig. 4 will be described.
Referring to fig. 4, NTC represents a negative temperature coefficient thermistor, i.e., the higher the temperature, the smaller the resistance value; d represents a comparator, the signal provided by the power signal terminal is VCC, and the voltage of the power signal VCC is greater than the voltage of the reference signal Vref, and if in the normal temperature state, the resistance value of the thermistor NTC is so large that the voltage input at the first input terminal of the comparator D is less than the voltage of the reference signal input at the second input terminal.
If the display device is currently in a normal temperature state and drives the backlight source 50 to emit light, the resistance value of the thermistor NTC is kept stable, and the thermistor NTC is a negative temperature coefficient thermistor NTC, so that the resistance value at this time is large, the divided voltage is large, the voltage input by the first input end of the comparator D is smaller than the voltage of the reference signal input by the second input end, and then the comparator D outputs a low level signal, which indicates that the current temperature is smaller than the preset temperature threshold. The second capacitor C2 and the third capacitor C3 can maintain the stability of the signal input by the second input terminal of the comparator D, the first capacitor C1 and the fourth capacitor C4 can maintain the stability of the potential of the output terminal of the comparator D, so as to ensure that the comparator D can output a stable potential, and the resistor R0 can prevent the signal output by the comparator D from damaging the FPGA. When receiving the low level signal, the FPGA determines that the backlight source 50 should be driven to emit light by using a conventional backlight driving program according to the correspondence between the pre-stored signal and the backlight driving program, so as to control the backlight driving circuit 40 to directly apply a preset voltage to the backlight source 50 to light the backlight source 50.
If the temperature of the display device increases and the resistance of the thermistor NTC decreases, the voltage division of the thermistor NTC decreases, and if the backlight 50 is driven to emit light during the temperature increase of the display device, the following two situations occur:
case 1: the temperature of the display device is not increased so much, the thermistor NTC detects that the temperature change of the display device is not large, so that when the resistance value of the thermistor NTC is not large, the voltage input by the first input end of the comparator D is still smaller than the voltage of the reference signal input by the second input end, at this time, the comparator D still outputs a low level signal, which indicates that the current temperature is still smaller than the preset temperature threshold value, when the FPGA receives the low level signal, it is determined that the backlight source 50 should be driven to emit light by using the conventional backlight driving program according to the corresponding relationship between the pre-stored signal and the backlight driving program, so that the backlight driving circuit 40 is controlled to directly apply the preset voltage to the backlight source 50, and the backlight source 50 is lighted.
Case 2: when the temperature of the display device rises, the thermistor NTC detects that the temperature of the display device changes greatly, so that when the resistance value of the thermistor NTC also changes greatly, the voltage input by the first input end of the comparator D may be greater than the voltage of the reference signal input by the second input end, at this time, the comparator D outputs a high level signal, which indicates that the current temperature is greater than the preset temperature threshold, and when the FPGA receives the high level signal, it determines that the backlight source 50 should be driven to emit light by using the segmented backlight driving program according to the corresponding relationship between the pre-stored signal and the backlight driving program, so that the backlight driving circuit 40 is controlled to apply voltage to the backlight source 50 step by step, and the backlight source 50 is lit.
To explain one point, the backlight driving circuit according to the embodiment of the present invention includes: the driving circuit is electrically connected to the driving motherboard and configured to receive an indication signal sent by the driving motherboard and used for indicating a backlight driving program, and the driving circuit is connected between the driving chip and the backlight source and configured to drive the backlight source to emit light under the control of the driving chip. The driving circuit and the driving chip may be any structures known to those skilled in the art to implement the functions of the driving circuit and the driving chip, and are not limited herein.
Moreover, the backlight source mentioned in the embodiment of the present invention may be a side-in type backlight source, as shown in a schematic partial structure diagram of the backlight module shown in fig. 6, that is, a plurality of light emitting elements 51 (e.g., LEDs) are arranged side by side on a flexible circuit board 53 (the flexible circuit board 53 may be a flexible circuit board provided with a temperature detection module and a backlight control circuit), only one light emitting element 51 is shown in fig. 5, but it is not limited to include only one light emitting element 51, and a light guide plate 52 is disposed on a light emitting surface of the light emitting element 51, and is used for changing a propagation direction of light emitted by the light emitting element 51, so that the light can be uniformly emitted from the light emitting surface (as shown by.
Of course, the backlight source mentioned in the embodiment of the present invention may also be a direct-type backlight source, that is, a plurality of light emitting elements 51 (such as LEDs) are fabricated on a substrate to form an LED substrate (as shown in fig. 5, 51 represents a light emitting element, and the light emitting elements 51 are arranged in an array) and disposed in an iron frame 54 of the backlight module, as shown in the schematic view of a local structure of the backlight module shown in fig. 7, such a type of backlight source can implement regional dimming, improve the display contrast of the display device, and enable the display device to have a more excellent display effect. In addition, the thickness of the backlight module corresponding to the backlight source can be made thinner, and the thin design of the display device is facilitated.
In addition, the display device according to the embodiment of the present invention may be a liquid crystal display device, and as shown in fig. 8, the liquid crystal display device may include a liquid crystal display panel 1 and a backlight module 2, the liquid crystal display panel 1 is disposed on a light-emitting surface of the backlight module 2 (an arrow indicates a light-emitting direction of a backlight source emitted by the backlight module 2), and the backlight source provided by the backlight module 2 is utilized to enable the liquid crystal display panel 1 to display an image. The liquid crystal display panel 1 includes: the liquid crystal display panel comprises an array substrate 1a and an opposite substrate 1b which are oppositely arranged, and a liquid crystal 1c which is positioned between the array substrate 1a and the opposite substrate 1b, wherein a pixel electrode (not shown) is arranged on the array substrate 1a, a common electrode (not shown) can be arranged on the array substrate 1a, and can also be arranged on the opposite substrate 1b, and the liquid crystal 1c can be deflected to enable a backlight source to transmit through an electric field between the pixel electrode and the common electrode, so that the display function is realized.
Of course, the specific structure of the liquid crystal display panel may be any structure known to those skilled in the art, and is not limited herein.
Based on the same inventive concept, an embodiment of the present invention provides a driving method of a display device, where the display device has a structure similar to that of the display device provided in the embodiment of the present invention, and the driving method includes:
the driving main board executes the following processes:
when a second temperature detection signal sent by the backlight control circuit is received, controlling the backlight driving circuit to apply voltage to the backlight source step by step so as to enable the total voltage applied to the backlight source to be a preset voltage;
when a second temperature detection signal sent by the backlight control circuit is received, the backlight drive circuit is controlled to directly apply a preset voltage to the backlight source;
wherein the second temperature detection signal is: the backlight control circuit judges a signal sent after the current temperature of the display device is greater than a preset temperature threshold value according to a first temperature detection signal sent by the temperature detection module, and a second temperature detection signal is as follows: the backlight control circuit judges a signal sent after the current temperature of the display device is not greater than a preset temperature threshold value according to a first temperature detection signal sent by the temperature detection module, wherein the first temperature detection signal is as follows: and the temperature detection module acquires the current temperature of the display device and then sends the signal.
Next, a driving method of the display device will be described with reference to a flowchart of the driving method shown in fig. 9.
See the flow chart shown in fig. 9.
S901, a temperature detection module acquires the current temperature of a display device;
s902, the temperature detection module sends a first temperature detection signal for indicating the current temperature to the backlight control circuit;
s903, judging whether the current temperature is greater than a preset temperature threshold value by the backlight control circuit according to the received first temperature detection signal; if yes, go to step S904; if not, go to step S907;
s904, the backlight control circuit sends a first A temperature detection signal to the driving mainboard;
s905, the driving main board determines a backlight driving program corresponding to the received first A temperature detection signal and sends a first indication signal to a backlight driving circuit;
s906, the backlight driving circuit applies voltage to the backlight source step by step according to the received first indication signal so that the total voltage applied to the backlight source is a preset voltage;
s907, the backlight control circuit sends a first B temperature detection signal to the driving main board;
s908, the driving main board determines a backlight driving program corresponding to the received first B temperature detection signal and sends a second indication signal to a backlight driving circuit;
and S909, the backlight driving circuit directly applies preset voltage to the backlight source according to the received second indication signal.
The embodiment of the invention provides a display device and a driving method thereof, the current temperature of the display device can be detected through a temperature detection module, then the detection result is sent to a backlight control circuit, the backlight control circuit can judge whether the current temperature is greater than a preset temperature threshold value or not according to the detection result, if so, the display device is in a high-temperature state, a second temperature detection signal is sent to a driving mainboard, so that the driving mainboard controls the backlight driving circuit to apply voltage to a backlight source step by step, the situation that the maximum current in the backlight source is greater than the self-protection current is avoided, if not, the display device is not in the high-temperature state, the second temperature detection signal is sent to the driving mainboard, so that the driving mainboard controls the backlight driving circuit to directly apply the preset voltage to the backlight source, and therefore, the backlight source can be normally lightened no matter whether the display device is in the high-temperature state or not is ensured, and then guarantee that display device still can realize the display function under high temperature, can also protect the backlight simultaneously and avoid damaging.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A display device, comprising: the backlight driving circuit comprises a driving mainboard, a backlight driving circuit, a backlight control circuit, a backlight source and a temperature detection module;
the temperature detection module is electrically connected with the backlight control circuit and is used for:
when the backlight source is determined to be required to be lightened currently, acquiring the current temperature of the display device, and sending a first temperature detection signal to the backlight control circuit;
the backlight control circuit is also electrically connected with the driving main board and is used for:
judging whether the current temperature is greater than a preset temperature threshold value or not according to the first temperature detection signal;
if yes, sending a second temperature detection signal to the driving main board;
if not, sending a second diethyl temperature detection signal to the driving main board;
the backlight driving circuit is connected between the driving main board and the backlight source, and the driving main board is used for:
when the second temperature detection signal is received, controlling the backlight driving circuit to apply voltage to the backlight source step by step so that the total voltage applied to the backlight source is a preset voltage;
when the second temperature detection signal is received, controlling the backlight driving circuit to directly apply the preset voltage to the backlight source; the preset voltage is the voltage required when the backlight source is normally lightened.
2. The display device of claim 1,
the drive main board is specifically configured to:
when the second temperature detection signal is received, controlling the backlight driving circuit to apply voltage to the backlight source for N times so that the total voltage applied to the backlight source is a preset voltage; the maximum current in the backlight source is not more than the preset self-protection current when voltage is applied to the backlight source every time, and N is an integer more than 1.
3. The display device according to claim 2, wherein N is 2, and the current in the backlight increases by 0.3 to 0.8 times a preset current each time a voltage is applied to the backlight;
wherein the preset current is: and applying the preset voltage to the backlight source to obtain the current in the backlight source.
4. The display device of claim 3, wherein the current in the backlight increases by a value of 0.5 times the predetermined current each time a voltage is applied to the backlight.
5. The display device of claim 1, wherein the backlight control circuit comprises a comparator;
the temperature detection module is connected between the first input end of the comparator and the power signal end, and is specifically used for: inputting a voltage signal representing the acquired current temperature to a first input end of the comparator;
the second input end of the comparator is electrically connected with the reference signal end, the output end of the comparator is respectively electrically connected with the driving main board and the power signal end, and the comparator is used for:
judging whether the current temperature is greater than the preset temperature threshold value or not according to the magnitude relation between the voltage signal input by the first input end and the reference signal input by the second input end;
if so, sending the second temperature detection signal to the driving main board;
and if not, sending the second temperature detection signal to the driving main board.
6. The display device of claim 5, wherein the temperature detection module comprises any one of a thermistor, a thermal sensor, and a thermocouple.
7. The display device of claim 5, wherein the backlight control circuit further comprises: the circuit comprises a first capacitor, a second capacitor, a third capacitor, a fourth capacitor and a resistor with a fixed resistance value;
the first capacitor and the fourth capacitor are connected in parallel between a grounding end and the power signal end;
the second capacitor and the third capacitor are connected in parallel between the ground terminal and the second input end of the comparator;
the resistor is connected between the power supply signal end and the output end of the comparator.
8. The display device according to claim 7, wherein the first capacitor and the second capacitor have a first capacitance value, and the third capacitor and the fourth capacitor have a second capacitance value;
the first capacitance value is greater than the second capacitance value.
9. The display device according to claim 1, further comprising flexible wiring boards electrically connected to the driver main board and the backlight, respectively;
the temperature detection module and the backlight control circuit are both arranged on the flexible circuit board.
10. A driving method of a display device according to any one of claims 1 to 9, wherein the driving method comprises:
the driving main board executes the following processes:
when a second temperature detection signal sent by a backlight control circuit is received, controlling a backlight driving circuit to apply voltage to a backlight source step by step so as to enable the total voltage applied to the backlight source to be a preset voltage;
when a second temperature detection signal sent by the backlight control circuit is received, the backlight driving circuit is controlled to directly apply the preset voltage to the backlight source;
wherein the second temperature detection signal is: the backlight control circuit judges a signal sent after the current temperature of the display device is greater than a preset temperature threshold value according to a first temperature detection signal sent by a temperature detection module, wherein the second temperature detection signal is as follows: the backlight control circuit judges that the current temperature of the display device is not greater than the signal sent after the preset temperature threshold value according to the first temperature detection signal sent by the temperature detection module, wherein the first temperature detection signal is as follows: when the temperature detection module determines that the backlight source needs to be lightened currently, acquiring a signal sent after the current temperature of the display device; the preset voltage is the voltage required when the backlight source is normally lightened.
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