WO2019080206A1

WO2019080206A1 - Apparatus and method for controlling brightness of light-emitting diode light source

Info

Publication number: WO2019080206A1
Application number: PCT/CN2017/111201
Authority: WO
Inventors: 何怀亮
Original assignee: 惠科股份有限公司
Priority date: 2017-10-26
Filing date: 2017-11-15
Publication date: 2019-05-02
Also published as: CN107809822A

Abstract

Provided are an apparatus and method for controlling the brightness of a light-emitting diode light source. The brightness control apparatus comprises a device brightness detector (24), an ambient light brightness detector (25), a brightness setting unit (21), an adjustable current source (23) and a light-emitting diode current controller (22), wherein the device brightness detector (24) is used for acquiring a device brightness detection value corresponding to the brightness of a light-emitting diode light source; the ambient light brightness detector (25) is used for acquiring an ambient light brightness value; the brightness setting unit (21) provides a set brightness value to the light-emitting diode current controller (22); and the light-emitting diode current controller (22) compares the device brightness detection value with the set brightness value, so as to generate a control signal to control the adjustable current source (23) so same changes an operation drive current of the light-emitting diode light source.

Description

Luminance control device and method for LED light source

Technical field

[0001] The present application relates to an LED light source, and more particularly to a brightness control device and method for an LED source.

Background technique

[0002] The brightness control device of the prior art LED light source includes a light emitting diode current controller, an RC filter circuit, a current regulator, a resistor, a capacitor, and a diode.

[0003] The LED current controller generates a driving signal according to the voltage of the return voltage, and the RC filter circuit is configured to filter the driving signal, and send the filtered driving signal to the current regulator, and the current regulator according to the filtering The drive signal adjusts the operating drive current of the LED source.

[0004] Since the electrical characteristics of the light-emitting diode light source may be different due to the use of the turn-to-turn or temperature, the operating drive current through the light-emitting diode light source may change due to the use of the turn-off or temperature, resulting in a change in the brightness of the light-emitting diode light source, and now A technical brightness control device does not solve this problem.

[0005] Although there are methods in the prior art that use a comparison method to lock the operating drive current to a predetermined drive current, the LED source has a corresponding brightness. However, the brightness of the LED light source actually gives the human eye a variability due to other factors, such as ambient light, which may affect the human eye's perception of the same brightness. In addition, even with the same operational drive current, the LED source may have different brightness due to temperature and use. Furthermore, the brightness of the illumination device using the LED light source and the illumination source of the display device may cause differences in the brightness of the final transmission to the human eye due to the influence of other components in the middle. In other words, there is still room for improvement in prior art brightness control devices and methods.

technical problem

[0006] The technical problem to be solved by the present application is to provide a brightness control device for an LED light source to avoid brightness and set brightness values of the device due to factors such as the temperature of the LED source, the use of the daytime or components of the device, and the like. There is a big deviation.

[0007] A further technical problem to be solved by the present application is to provide a brightness control method for an LED light source to avoid factors such as temperature of the LED source, use of turns, or components of the device. The brightness of the device has a large deviation from the set brightness value.

Problem solution

Technical solution

[0008] Based on the foregoing objectives, an embodiment of the present application provides a brightness control device for an LED light source, wherein the brightness control device includes: a device brightness detector for acquiring a brightness corresponding to a brightness of the LED light source. a device brightness detection value; a brightness setting unit for providing a brightness setting value; an adjustable current source electrically connected to the LED light source for providing an operating driving current to the LED light source; and a LED current The controller is electrically connected to the device brightness detector, the brightness setting unit and the adjustable current source, for comparing the device brightness detection value with the brightness setting value, and generating a control signal Controlling the adjustable current source to change the operational drive current of the LED source.

[0009] Optionally, the brightness control device further includes: an ambient light brightness detector electrically connected to the light emitting diode current controller for detecting ambient light to obtain an ambient light brightness value; wherein the brightness light emitting diode The current controller further generates the control signal according to the ambient light brightness value to fine tune the operating drive current.

[0010] Optionally, the light emitting diode light source comprises at least one light emitting diode.

[0011] Optionally, the adjustable current source includes: a resistor; and a gate transistor, wherein a gate is configured to receive the control signal, and a drain thereof is configured to provide the operating drive current to the light emitting diode The light source, and its source are electrically conductive.

[0012] Optionally, the device brightness detection value is a brightness of the LED light source.

[0013] Optionally, after the difference between the device brightness detection value and the brightness setting value is out of range, generating a control signal to adjust an operation driving current, so that the device brightness detection value approaches the Brightness setting.

[0014] Optionally, the switching transistor is controlled to be turned on or off by the control signal to adjust the operating driving current.

[0015] Optionally, the device brightness detector and the ambient light brightness detector are light receiving diodes.

[0016] Based on the foregoing objectives, an embodiment of the present application provides a brightness control device for an LED light source, including: a device brightness detector, configured to acquire a device brightness detection value corresponding to a brightness of the LED light source. Brightness setting unit for providing brightness setting value; adjustable current source, electrical connection The LED light source is configured to provide an operation driving current to the LED light source; the LED current controller is electrically connected to the device brightness detector, the brightness setting unit, and the adjustable current source, And comparing the device brightness detection value and the brightness setting value, and generating a control signal to control the adjustable current source to change the operating driving current of the LED light source; the ambient light brightness detector, Electrically connecting the LED current controller to detect ambient light to obtain an ambient light brightness value; wherein the LED current controller generates the control signal according to the ambient light brightness value to fine tune the Operating the driving current; wherein the adjustable current source comprises: a resistor; and a switching transistor, the gate of the transistor is configured to receive the control signal, and a drain thereof is configured to provide the operating driving current to the LED light source And its source electrical resistance.

[0017] Based on the foregoing objectives, an embodiment of the present application provides a method for controlling brightness of an LED light source, including: receiving a brightness value of a device for setting a brightness value; and detecting a brightness value according to the brightness value of the device. Generating a control signal; changing an operational drive current according to the control signal; acquiring an ambient light luminance value; and fine-tuning the operational drive current according to the ambient light luminance value.

[0018] Optionally, the brightness setting value and the temperature detection value are received.

[0019] Optionally, the temperature detection value is obtained by detecting a temperature of the LED light source.

[0020] Optionally, obtaining a prediction model based on the depth learning algorithm, and determining, according to the brightness setting value and the temperature detection value, the brightness setting value corresponding to the light emitting diode light source according to the prediction model The operation drives a current.

[0021] Optionally, the brightness set value is received and the inter-turn count value is used.

[0022] Optionally, the using the inter-turn count value is obtained by counting the use of the LED light source.

[0023] Optionally, obtaining a prediction model based on a depth learning algorithm, and determining, according to the brightness setting value, the brightness setting value corresponding to the light emitting diode light source according to the brightness setting value and the using the daytime counting value. The operation of the drive current.

Advantageous effects of the invention

Beneficial effect

[0024] By adopting the above technical solutions, the embodiments of the present application have at least the following beneficial effects: The brightness control device and method of the LED light source provided by the embodiments of the present application are not due to the temperature of the LED light source, the use of the inter-turn or the components of the device. Influence, which causes the brightness of the device to be significantly different from the set brightness value. Poor. The present application further considers the influence of ambient light brightness to adjust the operating drive current of the LED light source, so that the display device or the illumination device can achieve the purpose of power saving and/or optional display (lighting) effect. Brief description of the drawing

DRAWINGS

1 is a block diagram of a brightness control device of an LED light source according to an embodiment of the present application.

2 is a flow chart of a method for controlling brightness of an LED light source according to an embodiment of the present application.

3 is a block diagram of a brightness control device of an LED light source according to another embodiment of the present application.

4 is a flow chart of a method for controlling brightness of an LED light source according to another embodiment of the present application.

5 is a block diagram of a brightness control device of an LED light source according to another embodiment of the present application.

6 is a flowchart of a method for controlling brightness of an LED light source according to another embodiment of the present application.

7 is a block diagram of a display device of an embodiment of the present application.

Embodiments of the invention

[0032] In the following description, numerous specific details are set forth It is apparent, however, that the various embodiments may be practiced without these specific details or one or more equivalent arrangements. In other instances, well-known structures and devices are shown in the block diagrams in order to avoid unnecessarily obscuring various embodiments.

[0033] The illustrated embodiments are to be understood as providing the details of the various details of the various embodiments. Therefore, various illustrated features, components, modules, layers, films, panels, regions, and/or aspects may be additionally combined, separated, and without departing from the disclosed embodiments. Swap and/or rearrange. In addition, the dimensions and relative sizes of layers, films, panels, regions and the like may be exaggerated in the drawings. When the embodiments can be implemented differently, the particular processing order can be performed in a different order than described. For example, two consecutively described processes may be performed substantially the same or in the reverse order of the described order. In addition, the same component symbols denote the same components.

[0034] Embodiments of the present application provide a brightness control device and method for an LED light source, which directly detects brightness of a device using an LED light source, and sets a device brightness detection value and a user-set setting. After comparing the brightness values, a control signal for changing the driving operation current of the LED light source is generated according to the comparison result, so that the brightness of the device is similar to the set brightness value, and not because of the light emitting diode The temperature of the tube light source, the use of the daytime or the components of the device, resulting in a large deviation of the brightness of the device from the set brightness value. Optionally, the brightness control device and method further consider the influence of the ambient light brightness, and adjust the operating drive current of the light emitting diode light source according to the ambient light brightness.

[0035] Briefly, the present application directly measures the existing brightness of the LED light source (or its device). If the user wants to set a certain brightness, according to whether the existing brightness of the LED light source is different from the set brightness. Whether it is out of range, directly adjust the operating drive current. Further, the application also finely adjusts the operating drive current according to the ambient light brightness, so that the final actual brightness is close to the set brightness, and the display device or the illumination device can achieve power saving and/or optional display (lighting) effect. the goal of.

Please refer to FIG. 1. FIG. 1 is a block diagram of a brightness control apparatus for an LED light source according to an embodiment of the present application.

The brightness control device 2 of the LED light source LS (including at least one light emitting diode, in this embodiment, a plurality of LEDs connected in series) includes a brightness setting unit 21, a light emitting diode current controller 22, an adjustable current source 23 and The device brightness detector 24 is electrically connected to the brightness setting unit 21, the adjustable current source 23 and the device brightness detector 24, and the adjustable current source 23 is electrically connected to the LED source LS.

[0037] The device brightness detector 24 may be, for example, a light receiving diode for acquiring a device brightness detection value corresponding to the brightness of the LED light source LS, and the device brightness detection value is a device using the LED light source LS. The brightness of the device is determined by the brightness of the LED light source LS if there is no other component. The brightness setting unit 21 is for operating by the user or automatically operated by the operating system to generate a brightness setting value, and will provide the brightness setting value to the light-emitting diode current controller 22.

The adjustable current source 23 is operative to provide an operational drive current to the LED source LS and is controlled by a control signal generated by the LED current controller 22 to adjust the operational drive current. The adjustable current source 23 can be implemented by the transistor M1 and the resistor R1, but the application is not limited thereto. The gate of the transistor M1 receives the control signal, and the source of the transistor M1 is electrically connected to the low voltage VSS through the resistor R1, and the two ends of the LED light source are electrically connected to the high voltage VDD and the drain of the bypass transistor M1, respectively. . By controlling the switching of the transistor M1, the operational driving current of the LED light source LS can be equivalently changed.

[0039] The LED current controller 22 compares the device brightness detection value with the brightness setting value to generate a control signal to control the adjustable current source 23 to change the operational driving current of the LED source LS. Further, hair The photodiode current controller 22 determines whether the difference between the device brightness detection value and the brightness setting value is out of range to further generate a control signal. When the difference between the device brightness detection value and the brightness setting value is not exceeded, the operation driving current is no longer increased or decreased; instead, the operating driving current is increased or decreased to increase or decrease the device detecting brightness value, thereby The device detects that the brightness value approaches the set brightness value.

[0040] In the embodiment of the present application, the influence of the ambient light brightness can be considered. Since the brightness of the ambient light is brighter, the human eye is less sensitive to changes in the brightness of the device. Therefore, the brightness detection value of the device can be adjusted to be lower than the set brightness value, but the device brightness detection value and the set brightness value are set. The difference between them is still out of scope. In addition, when the ambient light is dark, the human eye is sensitive to changes in the brightness of the device. Therefore, the device brightness detection value can be adjusted to be higher than the set brightness value, but the device brightness detection value and the set brightness value. The difference between them is still out of scope. Thus, the brightness control device 2 can achieve the purpose of power saving and/or optional display (illumination) effects.

[0041] In FIG. 2, the brightness control device 2 further includes an ambient light brightness detector 25, and the ambient light brightness detector 25 is electrically connected to the light emitting diode current controller 22, wherein the ambient light brightness detector 25 can be, for example, It is a light receiving diode. The LED current controller 22 can finely adjust the operation driving current according to the ambient light sample value obtained by the ambient light brightness detector 25, so that the device brightness detection value is adjusted to be higher or lower than the set brightness value, but the device brightness is The difference between the detected value and the set brightness value is still out of range.

[0042] Next, please refer to FIG. 2. FIG. 2 is a flow chart of a method for controlling brightness of an LED light source according to an embodiment of the present application. In step S31, the set brightness value device brightness detection value is received. Next, in step S32, a control signal is generated according to the set brightness value and the device brightness detection value. Thereafter, in step S33, the operation drive current is changed in accordance with the control signal. In addition, the brightness control method further includes acquiring an ambient light brightness value, and fine-tuning the operation drive current according to the ambient light brightness value.

[0043] The brightness control device and method of the LED light source of the foregoing embodiments may be such that the brightness of the device is similar to the set brightness value without being affected by the temperature of the LED light source, the use of the turn, or the components of the device. This causes the brightness of the device to deviate significantly from the set brightness value. In addition, the brightness control device and method more consider the influence of ambient light brightness, and adjust the operating drive current of the light emitting diode light source according to the ambient light brightness, so that the display device or the lighting device can achieve power saving and/or optional display ( Lighting) The purpose of the effect. [0044] Another embodiment of the present application provides a brightness control device and method for an LED light source, which uses a deep learning algorithm to train a prediction model, and thus based on the prediction model based on the brightness setting value and the temperature detection value, The operational drive current required for the LED source is accurately calculated, and a control signal is generated accordingly to control the operation of the drive current. In this way, the brightness of the LED light source can approach the brightness setting value without causing the brightness of the photodiode source to deviate from the brightness setting value due to the temperature change. In short, this application does not cause a large deviation between the brightness and brightness setting of the device due to the influence of the temperature of the LED light source.

[0045] Optionally, the present application further considers the influence of the ambient light brightness, and adjusts the operating driving current of the LED light source according to the ambient light brightness, so that the final actual brightness is close to the set brightness, and the display device or the lighting device Can achieve the purpose of power saving and / or better optional display (lighting) effect.

[0046] In addition, the foregoing deep learning algorithm may be implemented by a neural network-like algorithm or a support vector machine algorithm. Further, before the brightness control device leaves the factory, the prediction model is trained according to the training set, and then the brightness control device can calculate the operation required for the LED light source based on the temperature detection value and the brightness setting value based on the prediction model. Drive current. The foregoing training set is a plurality of known temperature detection values, a plurality of known brightness setting values, and a plurality of known operations corresponding to the brightness of the LED light source being equal to a plurality of known brightness setting values. Drive current. In the case of a neural network algorithm, the training set can be used to find the weights of the nodes of the neural network to train the prediction model.

Please refer to FIG. 3. FIG. 3 is a block diagram of a brightness control apparatus for an LED light source according to another embodiment of the present application. The brightness control device 4 of the LED light source LS (including at least one light emitting diode, in this embodiment, a plurality of LEDs connected in series) includes a brightness setting unit 41, a temperature detecting unit 42, a current controller 43, and an adjustable Current source 44. The current controller 43 is electrically connected to the brightness setting unit 41, the temperature detecting unit 42 and the adjustable current source 44, and the adjustable current source 34 is electrically connected to the LED source LS.

[0048] The temperature detecting unit 42 is configured to detect the temperature of the LED light source LS and generate a temperature detection value to the current controller 43. The brightness setting unit 41 is used to operate the user or to be automatically operated by the operating system to generate a brightness setting value, and to provide a brightness setting value to the current controller 43.

[0049] Since the temperature may change the electrical characteristics of the LED source LS, resulting in the same operation drive current at different temperatures, the brightness of the light emitted by the LED source LS is different, therefore, the present application uses a deep learning algorithm to find out Temperature and brightness setting values of nonlinear relationships and prediction of operating drive current Model. Based on the prediction model, the current controller 43 calculates an operation drive current that causes the luminance of the light emitted from the LED light source LS to be equal to the brightness setting value according to the brightness setting value and the temperature detection value.

[0050] Next, the current controller 43 generates a control signal according to the calculated operation drive current, so that the adjustable current source 44 supplies the calculated operational drive current to the LED light source LS. The adjustable current source 3 4 can be implemented by the transistor M1 and the resistor R1, but the application is not limited thereto. The gate of the transistor M1 receives the control signal, and the source of the transistor M1 is electrically connected to the low voltage VSS through the resistor R1, and the two ends of the LED light source are electrically connected to the high voltage VDD and the drain of the bypass transistor M1, respectively. . By controlling the switching of the transistor M1, the operational driving current of the LED light source LS can be changed equivalently.

[0051] In the embodiment of the present application, the influence of ambient light brightness can be considered. Since the brightness of the ambient light is brighter, the human eye is less sensitive to changes in the brightness of the device. Therefore, the brightness of the LED light source LS can be adjusted slightly lower than the brightness setting value. In addition, when the ambient light is dark, the human eye is sensitive to changes in the brightness of the device. Therefore, the brightness of the LED light source LS can be adjusted slightly higher than the brightness setting value. Thus, the brightness control device 3 can achieve the purpose of power saving and/or better display (lighting) effect.

[0052] In FIG. 3, the brightness control device 4 further includes an ambient light brightness detector 45, and the ambient light brightness detector 35 is electrically connected to the current controller 43, wherein the ambient light brightness detector 45 can be, for example, light. Receive diode. The current controller 43 can further fine-tune the operation driving current according to the ambient light brightness value obtained by the ambient lightness detector 45, so that the brightness of the light emitted by the LED light source is slightly higher than the brightness setting value.

Further, the current controller 43 calculates an operation driving current required for the X-ray light source LS based on the brightness setting value, the temperature detection value, and the ambient light brightness value based on the prediction model. Therefore, the training set includes a plurality of known temperature detection values, a plurality of known ambient light brightness values, a plurality of known brightness setting values, and a brightness of the LED light source that is slightly higher or slightly lower than A plurality of known operational drive currents corresponding to the known brightness settings of the pen. Alternatively, the current controller 43 is based on the prediction model, and after the operation drive current is calculated based on the brightness setting value and the temperature detection value, the operation drive current is finely adjusted according to the ambient light brightness value.

[0054] Next, please refer to FIG. 4. FIG. 4 is a method for controlling brightness of an LED light source according to another embodiment of the present application. Flow chart. In step S51, the brightness setting value and the temperature detection value are received, wherein the temperature detection value is obtained by detecting the temperature of the LED light source. Next, in step S52, a prediction model based on the depth learning algorithm is obtained, and based on the prediction model, an operation driving current corresponding to the brightness setting value of the light emitting diode light source is determined according to the brightness setting value and the temperature detection value. Thereafter, in step S53, a control signal is generated to change the operational drive current, thereby causing the LED light source to receive the aforementioned determined operational drive current. In addition, the brightness control method further includes acquiring an ambient light brightness value, and adjusting the operating drive current according to the ambient light brightness value.

[0055] The brightness control device and method of the LED light source of the foregoing embodiment can make the brightness and brightness setting values of the device similar, without causing the brightness and brightness setting of the device due to the influence of the temperature of the LED light source. There is a large deviation in the value. In addition, the brightness control device and method more consider the influence of ambient light brightness, and adjust the operating drive current of the light emitting diode light source according to the ambient light brightness, so that the display device or the lighting device can achieve power saving and/or better display ( Lighting) The purpose of the effect.

[0056] Another embodiment of the present application provides a brightness control apparatus and method for an LED light source, which uses a depth learning algorithm to train a prediction model, such that the prediction model is based on the brightness setting value and the use of the LED light source. The inter-count value can accurately calculate the operation drive current required for the LED light source, and accordingly generate a control signal to control the operation drive current. In this way, the brightness of the light-emitting diode light source can approach the brightness setting value, and the brightness of the photodiode light source does not deviate from the brightness setting value due to the influence of the use of the light-emitting diode light source. In short, this application does not cause a large deviation between the brightness and brightness setting of the device due to the influence of the use of the LED light source.

[0057] Optionally, the present application further considers the influence of the ambient light brightness and the temperature of the LED light source, and adjusts the operating driving current of the LED light source according to the ambient light brightness and the temperature detection value of the LED light source, so that the last The actual brightness is close to the set brightness and enables the display device or illumination device to achieve power saving and/or better display (lighting) effects.

[0058] In addition, the foregoing deep learning algorithm may be implemented by a neural network-like algorithm or a support vector machine algorithm. Further, before the brightness control device leaves the factory, the prediction model is trained according to the training set, and then the brightness control device can calculate the operation required for the LED light source based on the temperature detection value and the brightness setting value based on the prediction model. Drive current. The aforementioned training set is a plurality of known use of the dipmeter The value, a plurality of known brightness setting values, and the brightness of the LED source thereof are equal to a plurality of known known operating currents that correspond to the brightness setting values. In the case of a neural network algorithm, the training set can be used to find the weights of the nodes of the neural network to train the prediction model.

Please refer to FIG. 5. FIG. 5 is a block diagram of a brightness control apparatus for an LED light source according to another embodiment of the present application. The brightness control device 6 of the light-emitting diode light source LS (including at least one light-emitting diode, in this embodiment, a plurality of light-emitting diodes connected in series) includes a brightness setting unit 61, a metering unit 62, a current controller 63, and an adjustable current Source 64. The current controller 63 is electrically connected to the brightness setting unit 61, the metering unit 62 and the adjustable current source 64, and the adjustable current source 64 is electrically connected to the LED source LS.

[0060] The counting unit 62 is configured to count the use time of the LED light source LS, and generate a current controller 63 using the inter-turn count value. The brightness setting unit 61 is used to operate or hand over to the operating system to generate a brightness setting value, and to provide a brightness setting value to the current controller 63.

[0061] Since the use of the counting LED light source LS may change the electrical characteristics of the LED light source LS, resulting in the same operation driving current between different turns, the brightness of the light emitted by the LED light source LS is different, therefore, Apply to use a deep learning algorithm to find a predictive model of the use of the inter-turn, brightness setpoint, and operational drive current for nonlinear relationships. Based on the prediction model, the current controller 63 calculates an operation drive current for causing the luminance of the light emitted from the light-emitting diode light source LS to be equal to the brightness setting value based on the brightness setting value and the use of the day-to-day count value.

[0062] Next, the current controller 63 generates a control signal according to the calculated operation drive current, so that the adjustable current source 64 provides the calculated operational drive current to the LED light source LS. The adjustable current source 64 can be implemented by the transistor M1 and the resistor R1, but the application is not limited thereto. The gate of the transistor M1 receives the control signal, and the source of the transistor M1 is electrically connected to the low voltage VSS through the resistor R1, and the two ends of the LED light source are electrically connected to the high voltage VDD and the drain of the bypass transistor M1, respectively. . By controlling the switching of the transistor M1, the operational driving current of the LED light source LS can be changed equivalently.

[0063] In the embodiment of the present application, the influence of ambient light brightness can be considered. Since the brightness of the ambient light is brighter, the human eye is less sensitive to changes in the brightness of the device. Therefore, the brightness of the LED light source LS can be adjusted slightly lower than the brightness setting value. In addition, when the ambient light is dark, the human eye is sensitive to changes in the brightness of the device. Therefore, the brightness of the LED light source LS can be adjusted to the brightness setting value. Slightly higher. Thus, the brightness control device 6 can achieve the purpose of saving power and/or better display (lighting) effect.

[0064] In FIG. 5, the brightness control device 6 further includes an ambient light brightness detector 65, and the ambient light brightness detector 65 is electrically connected to the current controller 63, wherein the ambient light brightness detector 65 can be, for example, light. Receive diode. The current controller 63 can further fine-tune the operation driving current according to the ambient light brightness value obtained by the ambient lightness detector 65, so that the brightness of the light emitted by the LED light source is slightly higher than the brightness setting value.

Further, the current controller 63 calculates an operation driving current required for the xenon LED light source LS based on the brightness setting value, the diurnal count value, and the ambient light brightness value based on the prediction model. Therefore, the training set includes a plurality of known use of the diurnal count value, a plurality of known ambient light luminance values, a plurality of known luminance setting values, and a brightness of the LED light source that is slightly higher or slightly lower. A plurality of known operational drive currents corresponding to a plurality of known brightness settings. Alternatively, the current controller 63 is based on the prediction model, and after the operation drive current is calculated based on the brightness setting value and the inter-turn count value, the operation drive current is fine-tuned according to the ambient light brightness value.

[0066] In FIG. 5, the brightness control device 6 further includes a temperature detecting unit 66 electrically connected to the current controller 63. Since the temperature also affects the electrical characteristics of the LED light source LS, the present application detects the temperature of the LED light source LS by the temperature detecting unit 66, and considers the temperature detection value to calculate the operating drive current. Further, the current controller 63 may be based on the prediction model to calculate the operational drive current required for the x-ray source LS based on the brightness set value, the inter-turn count value, and the temperature detection value. Therefore, the training set includes a plurality of known use of the diurnal count value, a plurality of known temperature detection values, a plurality of known brightness setting values, and the brightness of the LED light source is equal to a plurality of known A plurality of known operational drive currents corresponding to the brightness set values.

[0067] Next, please refer to FIG. 6, which is a flowchart of a method for controlling brightness of an LED light source according to another embodiment of the present application. In step S71, the brightness setting value and the use of the daytime counting value are obtained, wherein the use of the daytime counting value is obtained by counting the use of the light source of the light emitting diode. Next, in step S72, a prediction model based on the depth learning algorithm is obtained, and based on the prediction model, an operation drive current for determining a brightness setting value corresponding to the light-emitting diode light source based on the brightness setting value and the day-to-day count value is used. Thereafter, in step S73, a control signal is generated to change the operation driving current, so that the LED light source receives the aforementioned determined operation. Drive current. In addition, the brightness control method further includes acquiring an ambient light brightness value and a temperature detection value of the LED light source, and adjusting the operation driving current according to the ambient light brightness value and the temperature detection value.

[0068] The brightness control device and method of the LED light source of the foregoing embodiments can make the brightness and brightness setting values of the device similar, without causing the brightness and brightness of the device due to the influence of the use of the LED light source. There is a large deviation in the set value. In addition, the brightness control device and method further consider the influence of the ambient light brightness and the temperature of the light emitting diode light source, and adjust the operating driving current of the light emitting diode light source according to the ambient light brightness and the detected temperature value, so as to make the display device or the lighting device Can achieve the purpose of power saving and / or better display (lighting) effect.

[0069] Finally, please refer to FIG. 7, FIG. 7 is a block diagram of a display device according to an embodiment of the present application. The display device 8 includes a backlight 81, a power supply 82, a liquid crystal panel 83, a drive circuit 84, and a brightness control device 85. The power supply 82 is electrically connected to the backlight 81, the liquid crystal panel 83, the driving circuit 84 and the brightness control device 85, the brightness control device 85 is electrically connected to the backlight 81, and the liquid crystal panel 83 is electrically connected to the driving circuit 84.

[0070] The power supply 82 is configured to supply power to the backlight 81, the liquid crystal panel 83, the driving circuit 84, and the brightness control device 85. The driving circuit 84 includes a gate driving circuit and a data driving circuit for selecting pixels in the liquid crystal panel 83 and transmitting the data signals to the selected pixels. The backlight 81 may be the aforementioned light emitting diode light source, and the brightness control device 85 may be the aforementioned brightness control device.

[0071] The content of the above multiple embodiments is at least one of the numerous embodiments of the present application, and the technical person in the technical field of the present application can understand the core concept of the present application after reading the above content, and The needs of the above embodiments are modified. In other words, the content of the above embodiments is not intended to limit the application, and the scope of the application is defined by the text of the claims.

Claims

Claim

[Aspect 1] A brightness control device for an LED light source, wherein the brightness control device comprises:

The device brightness detector obtains a device brightness detection value corresponding to the brightness of the LED light source;

a brightness setting unit that provides a brightness setting value;

Adjusting a current source electrically connected to the LED light source to provide an operating drive current to the LED light source;

a light-emitting diode current controller electrically connecting the device brightness detector, the brightness setting unit and the adjustable current source to compare the device brightness detection value and the brightness setting value, and generate A control signal is provided to control the adjustable current source to change the operational drive current of the LED source.

The brightness control device of the light-emitting diode light source according to claim 1, wherein the brightness control device further comprises:

An ambient light level detector is electrically connected to the LED current controller to detect ambient light and obtain an ambient light brightness value;

Wherein the LED current controller further generates the control signal according to the ambient light luminance value to fine tune the operation driving current.

[Claim 3] The brightness control device of the light emitting diode light source according to claim 1, wherein the light emitting diode light source comprises at least one light emitting diode.

[Claim 4] The brightness control device of the light emitting diode light source according to claim 1, wherein the adjustable current source comprises: a resistor;

The transistor is gated, the gate receiving the control signal, the drain providing the operational drive current to the LED source, and the source being electrically conductive.

[Claim 5] The brightness control device of the light emitting diode light source according to claim 1, wherein the device brightness detection value is a brightness of the light emitting diode light source.

[Claim 6] The brightness control device of the light emitting diode light source according to claim 1, wherein Wherein the difference between the device brightness detection value and the brightness setting value is out of range, a control signal is generated to adjust the operation driving current, so that the device brightness detection value approaches the brightness setting value.

A brightness control apparatus for an LED light source according to claim 4, wherein said switching transistor is controlled to be turned on or off by said control signal to adjust said operation driving current.

The brightness control device for an LED light source according to claim 2, wherein the device brightness detector and the ambient light level detector are light receiving diodes.

A brightness control device for an LED light source, characterized in that the brightness control device comprises:

a brightness setting unit that provides a brightness setting value;

a light-emitting diode current controller electrically connecting the device brightness detector, the brightness setting unit and the adjustable current source to compare the device brightness detection value and the brightness setting value, and generate Controlling a signal to control the adjustable current source to change the operational drive current of the LED source;

The LED current controller further generates the control signal according to the ambient light brightness value to finely adjust the operation driving current;

The adjustable current source includes:

Resistance;

A brightness control method for an LED light source, characterized in that the brightness control side The law includes:

Receiving a brightness value detection device brightness setting value;

And generating a control signal according to the set brightness value and the device brightness detection value; changing an operation driving current according to the control signal;

Obtaining ambient lightness values;

And fine-tuning the operating drive current according to the ambient light brightness value.

The method of controlling brightness of an LED light source according to claim 10, further comprising receiving a brightness setting value and a temperature detecting value.

[Claim 12] The method for controlling brightness of an LED light source according to claim 11, wherein the temperature detection value is obtained by detecting a temperature of the LED light source.

The method for controlling brightness of an LED light source according to claim 11, wherein a prediction model based on a depth learning algorithm is obtained, based on the prediction model, based on the brightness setting value and the temperature detection The value determines the operational drive current of the light-emitting diode source corresponding to the brightness setting value.

[Claim 14] The brightness control method of the light emitting diode light source according to claim 10, further comprising receiving the brightness setting value and using the daytime counting value.

The method of controlling brightness of an LED light source according to claim 14, wherein the use of the inter-turn count value is obtained by counting the use of the LED light source.

[Claim 16] The method for controlling brightness of an LED light source according to claim 14, wherein a prediction model based on a depth learning algorithm is obtained, based on the prediction model, based on the brightness setting value and the usage time The count value determines the operational drive current of the light-emitting diode source corresponding to the brightness setting value.