TWI715207B - Color temperature smoothing output system and controller - Google Patents

Abstract

The present invention provides a color temperature smoothing output system, comprising a first mixed light source, a second mixed light source, a light sensor, and a controller. The input end of the controller is coupled to or coupled to the photo sensor, and the photo sensor receives the sensing signal including the first color temperature modulation signal and the second color temperature modulation signal. The first output end of the controller is connected or coupled to the first light mixing source, and the first output signal of the first output is controlled according to the first color temperature modulation signal received by the controller by the photo sensor. Variables are then modulated. The second output end of the controller is connected or coupled to the second mixed light source, and the second output signal of the second output is controlled according to the second color temperature modulated signal received by the light sensor by the controller. Variables are then modulated.

Description

Color temperature smoothing output system and controller

The present invention relates to a color temperature smoothing output system and controller, in particular to a color temperature smoothing output system and controller that feedbacks the color temperature of a light source through a sensor and then smoothes the output through an algorithm to produce a color temperature gradient effect.

The phenomenon that the human eye's sensitivity to light changes is called light adaptation. When a person suddenly enters a dark place in a bright environment for a long time, he can't see anything at first. After a certain period of time, his visual sensitivity gradually increases, and he can gradually see objects in the dark. This phenomenon is called dark adaptation (dark adaptation). adaptation). On the contrary, when a person is in a dark place for a long time and suddenly enters a bright place, he feels a dazzling light at first and cannot see the object clearly. It takes a while to restore vision. This is called light adaptation.

Dark adaptation includes two basic processes: changes in pupil size and changes in retinal photosensitive chemicals. From light to dark, the pupil diameter can be enlarged from 2 mm to 8 mm, which increases the light entering the eyeball by 10-20 times. The adaptation process is very fast, usually within tens of seconds. From dark to bright, under the stimulation of strong light, the cone cells in the retina are immediately put into work. At the beginning, there are fewer cone cells working, and the eyes are very sensitive to light stimulation, so the light is dazzling. The surrounding scenery cannot be seen clearly. The intensity of the light emitted by the unit area of the LED lamp is extremely bright. When the LED lamp is turned on, the light source will reach the highest luminous brightness in an instant. In the case of sudden changes in brightness, it is easy to suddenly make the pupil too late to react, causing the instant light Cause permanent damage to the retina.

The main technology of adjustable temperature LED lights is to control the individual power of two different light sources. By adjusting the power ratio of different color temperature light sources (such as yellow light and white light) for mixing, different color temperature effects are produced. Therefore, under the adjustment of the color temperature, when one of the color temperature light sources is fixed to the other color temperature light source, the brightness of the overall ambient light source will also change rapidly, causing damage to the retina.

The main purpose of the present invention is to provide a color temperature smoothing output system, including a first light mixing light source, a second light mixing light source, a light sensor, and a light sensor connected or coupled to the first light mixing light source, The second mixed light source and the controller of the light sensor. The first mixed light source is used for controlling the output power of the first color temperature according to the first output signal. The second mixed light source is used for controlling the output power of the second color temperature according to the second output signal. The light sensor is used to obtain the color temperature in the ambient light. The controller includes an input terminal, a first output terminal, and a second output terminal. The input terminal is connected or coupled to the light sensor, and the light sensor receives a sensing signal including a first color temperature modulation signal and a second color temperature modulation signal. The first output terminal is connected or coupled to the first light mixing light source, and the first output signal of the first output terminal is used as a control variable based on the first color temperature modulation signal received by the controller from the light sensor And then modulate. The second output terminal is connected or coupled to the second light mixing light source, and the second output signal of the second output terminal is used as a control variable according to the second color temperature modulation signal received by the controller from the light sensor And then modulate.

Another object of the present invention is to provide a controller including an input terminal, a first output terminal, and a second output terminal. The input terminal receives a sensing signal including a first color temperature modulation signal and a second color temperature modulation signal. The first output signal of the first output terminal is modulated according to the first color temperature modulation signal received by the controller as a control variable. The second output signal of the second output terminal is modulated accordingly according to the second color temperature modulation signal received by the controller as a control variable.

Therefore, the present invention has the following advantages compared with the conventional technology:

1. The present invention can make the output of LED lamps have the effect of gradual color temperature, avoiding the environment The transient brightness changes cause discomfort to the eyes and even long-term damage to the retina.

2. The present invention uses the ambient light source as a reference, and uses the condition of the ambient light source as the feedback to modulate the color temperature of the output to increase the comfort of the user's eyes.

100‧‧‧Color temperature smoothing output system

10‧‧‧First mixed light source

20‧‧‧Second mixed light source

30‧‧‧Light Sensor

40‧‧‧Controller

41‧‧‧The first noise shaping modulator

411‧‧‧Bit Quantization Module

411A‧‧‧operator

411B‧‧‧Quantizer

412‧‧‧Mapping Module

42‧‧‧The second noise shaping modulator

4A‧‧‧Input terminal

4B‧‧‧First output

4C‧‧‧Second output

421‧‧‧Bit Quantization Module

421A‧‧‧operator

421B‧‧‧Quantizer

422‧‧‧Mapping Module

Figure 1 is a block diagram of the color temperature smoothing output system of the present invention.

Figure 2 is a functional block diagram (1) of the color temperature smoothing output system of the present invention.

Fig. 3 is a functional block diagram (2) of the color temperature smoothing output system of the present invention.

Figure 4 is a schematic diagram of a sample of the light level adjustment signal.

The detailed description and technical content of the present invention will now be described with the drawings as follows. Furthermore, for the convenience of description, the figures in the present invention are not necessarily drawn according to actual proportions. These figures and their proportions are not intended to limit the scope of the present invention, and are described here first.

The following is a description of one of the preferred embodiments of the present invention. Please refer to "Figure 1", which is a block diagram of the color temperature smoothing output system of the present invention, as shown in the figure: This embodiment discloses a color temperature smoothing The chemical output system 100 includes a first mixed light source 10, a second mixed light source 20, a light sensor 30, and is connected or coupled to the first mixed light source 10, the second mixed light source 20, and the The controller 40 of the light sensor 30.

The first light mixing light source 10 has a first type of color temperature. The first type of color temperature can be a warm color light source with a low color temperature, for example, a light source with a color temperature between 1700K and 5000K. As the basic light source for light mixing, The first light mixing light source 10 can select a light source with a low color temperature, but it is not limited thereto. The first light mixing light source 10 can be composed of a plurality of LED units (or arrays of LED units, light panels, etc.). In a feasible implementation aspect, the first light mixing light source 10 in addition to LED units, It may further include a driving unit connected to the plurality of LED units, and output to the The power of multiple LED units.

The second type of light mixing light source 20 has a second type of color temperature. The second type of color temperature can be, for example, a cold color light source with a high color temperature, such as a light source with a color temperature between 5000K and 9300K. As the basic light source for light mixing, the The second light mixing light source 20 may select a light source with a high color temperature. Similar to the first light mixing light source 10, the second light mixing light source 20 may be composed of a plurality of LED units (or arrays of LED units, light panels, etc.). In a feasible implementation aspect, the first In addition to the LED unit, the second light mixing light source 20 may further include a driving unit connected to the plurality of LED units, and modulates the power output to the plurality of LED units via the received signal.

It should be particularly noted that although the implementation aspects only disclose the first and second light mixing light sources 10 and 20, the number of light mixing light sources can be configured to two or more according to practical requirements, such as warm Yellow light, sunlight, etc., the number of these mixed light source types is not within the scope of the present invention. In addition, the mixed light sources can be jointly arranged on the same circuit board or lamp board and separated by different circuits, which is not limited in the present invention.

The light sensor 30 is used to detect the color temperature of the ambient light source. The obtained color temperature can be a specific value (such as a color temperature value), or a three-dimensional parameter composed of RGB three-color spectrum, etc., in the present invention No restrictions on it. The feedback signal can be output by the controller as two values, respectively corresponding to the ratio or power of the first color temperature (such as low color temperature light source) in the overall light source, and the second color temperature (such as high color temperature light source) in the overall light source And output the value as a sensing signal including a first color temperature modulation signal and a second color temperature modulation signal. The first color temperature modulation signal and the second color temperature modulation signal can be determined by the engineer according to the first The characteristics of the mixed light source 10 and the characteristics of the second mixed light source 20 estimate modulation. In another feasible implementation aspect, the number of the light sensors 30 may also be two or more than two, which are used to correspond to the first light mixing light source 10 and the second light mixing light source 20 respectively, so as to The output power of the first light mixing light source 10 and the second light mixing light source 20 are individually fed back.

In a feasible implementation aspect, the light sensor 30 may be a colorimeter (Colorimeter), obtains the brightness of the first color temperature and the brightness of the second color temperature through the colorimeter, and feeds these parameters back to the controller 40.

The controller 40 is connected or coupled to the first light mixing light source 10, the second light mixing light source 20, the light sensor 30, and the feedback correction output through the light sensor 30 to the first The output power of the light mixing light source 10 and the second light mixing light source 20 until the respective output powers of the first light mixing light source 10 and the second light mixing light source 20 reach a target value. The controller 40 may be, for example, but not limited to a central processing unit (CPU), or other programmable general-purpose or special-purpose microprocessors (Microprocessors), digital signal processors (Digital Signal Processors). , DSP), Application Specific Integrated Circuits (ASIC) or other similar devices or a combination of these devices. In a feasible embodiment, the controller 40 can be configured with a storage unit, or co-constituted as a single chip with the storage unit, for permanent or semi-permanent storage of partial information (such as look-up tables or working parameters, etc.). So that the relevant working parameters can be pre-stored and accessed during the next execution.

In a feasible implementation aspect, the controller 40 includes an input terminal 4A, an input terminal 4B, a first output terminal 4C, and a second output terminal 4D (when the sensors are multiple or mixed light sources) When the type is plural, the number of the input terminal and the output terminal can also be increased). The input terminals 4A and 4B are connected or coupled to the light sensor 30, and the light sensor 30 receives sensing signals. The first output terminal 4C is connected or coupled to the first light mixing light source 10, and the first output signal of the first output terminal 4C is based on the first output signal received by the light sensor 30 by the controller 40 The color temperature modulation signal is used as a control variable to be modulated accordingly; the second output terminal 4D is connected or coupled to the second light mixing light source 20, and the second output signal of the second output terminal 4D is controlled by the controller 40 The second color temperature modulation signal received by the light sensor 30 is used as a control variable to be modulated accordingly.

Please also refer to "Figure 2", which is a functional block diagram (1) of the color temperature smoothing output system of the present invention. As shown in the figure, the color temperature is adjusted mainly through the first mixed light source 10 and the second mixed light Light source 20 Individually modulate to obtain the final color temperature output. The output of the first mixed light source 10 and the second mixed light source 20 is fed back through the light sensor 30 and modulates the individual first mixed light source 10 and the The output curve of the second light mixing light source 20 can achieve the effect of gradual color temperature.

Hereinafter, the first color temperature modulation signal of the light sensor 30 is represented by i _n _lvl_x, and the first target value is represented by t_lvl_x. During execution, the controller 40 compares the first color temperature modulation signal i ₁ _lvl_x with the first target value t_lvl_x and outputs the first output signal. When the first color temperature modulation signal i ₁ _lvl_x is compared with the first target value t_lvl_x At the same time, the first output signal output by the controller 40 is a stop signal to stop the output modulation process of the first mixed light source 10; when the controller 40 detects the first color temperature modulation signal i ₁ _lvl_x When there is an error value (first error value) from the first target value t_lvl_x, the error value of the controller 40 is fed back to a first noise-correcting modulator 41, which 41 Modify the first color temperature modulation signal i ₂ _lvl_x according to the previous error value, compare it with the first target value t_lvl_x, and output the first output signal according to the comparison result, and so on, until the first The error value between the color temperature modulation signal i _n _lvl_x and the first target value t_lvl_x is equal to or close to zero.

Similarly, in the loop of the second light mixing light source 20, the second color temperature modulation signal of the light sensor 30 is represented by i _n _lvl_y, and the second target value is represented by t_lvl_y. During execution, the controller 40 compares the second color temperature modulation signal i ₁ _lvl_y with the second target value t_lvl_y and outputs the second output signal. When the second color temperature modulation signal i ₁ _lvl_y is compared with the second target value t_lvl_y At the same time, the second output signal output by the controller 40 is a stop signal to stop the output modulation process of the second mixed light source 20; when the controller 40 detects the second color temperature modulation signal i ₁ _lvl_y When there is an error value (second error value) from the first target value t_lvl_y, the error value of the controller 40 is fed back to a second noise-correcting modulator 42, which 42 Correct the second color temperature modulation signal i ₂ _lvl_y according to the previous error value, compare it with the second target value t_lvl_y, and output the second output signal according to the comparison result, and so on, until the second The error value between the color temperature modulation signal i _n _lvl_y and the second target value t_lvl_y is equal to or approaching zero.

The specific calculations of the first noise-correcting modulator 41 and the second noise-correcting modulator 42 are described below. Please refer to "Figure 3" and "Figure 4" together, which is the color temperature smoothing of the present invention The functional block diagram of the output system (2) and the sample diagram of the light level adjustment signal, as shown in the figure: The first noise shaping modulator 41 includes a bit quantization module 411 and a mapping module 412. The bit quantization module 411 is based on the difference between the first color temperature modulation signal and the first target value The spreading ratio of (spread ratio) obtains the light level adjustment signal, and the light level adjustment signal is removed by the operator 411A of low frequency noise, and is mapped to the first code value (codeword) by the quantizer 411B. The mapping module 412 outputs the corresponding adjustment level (adjustment level) and the first color temperature modulation signal according to the first code value (codeword) to correct the first color temperature modulation signal, and use it as the first output signal Output to the first mixed light source 10 for gradual dimming.

Similarly, the second noise shaping modulator 42 includes a bit quantization module 421 and a mapping module 422. The bit quantization module 421 modulates the signal according to the second color temperature and the second target The spread ratio between the values obtains the light level adjustment signal, and the light level adjustment signal is removed by the operator 421A of low-frequency noise, and is mapped to the second code value (codeword) by the quantizer 421B. The mapping module 422 outputs the corresponding adjustment level and the second color temperature modulation signal according to the second code value (codeword) to sum the second color temperature modulation signal to correct the second color temperature modulation signal, and use it as the second output signal Output to the second mixed light source 20 for progressive dimming.

Specifically, the light level adjustment signal as shown in "Figure 4" is obtained based on the relationship between the first color temperature modulation signal and the first target value (or the second color temperature modulation signal and the second target value) In the relationship diagram in Figure 4, the vertical direction is the value of the light level adjustment signal, and the horizontal direction is the time value. In the diagram, the time value unit is set according to actual needs. The longer the minimum unit time, the slower the light transition speed. On the contrary, the light source changes too fast, and an appropriate value is recommended. When the first target value is greater than the first color temperature modulation signal (the second target value is greater than the second color temperature modulation signal), the light level adjustment signal is in the ascending section, and the value of the light level adjustment signal outputted by sequential changes at any time will continue to increase ( Up to 1); otherwise, when the first target value is greater than the first When a color temperature modulation signal (the second target value is greater than the second color temperature modulation signal), the light level adjustment signal is located in the descending stage, and the value of the output light level adjustment signal for sequential changes at any time will continue to decrease (as low as 0).

The light level adjustment signal obtained at the corresponding timing will be input to the operators 411A and 421A to remove low-frequency noise and achieve the effect equivalent to a high-pass filter. Please also refer to "Figure 3". The operating system is as follows: x [ n ]= s [ n ]-2× e [ n -1]+ e [ n -2]; among them, s [ n ] is the light level adjustment signal input in time sequence n , and e [ n -1] is the quantizer The difference between the output of 411B and 421B and the previous filtered signal is the parameter obtained by the first delay, e [ n -2] is the parameter obtained by the second delay between the output of the quantizer and the previous filtered signal; x [ n ] is The filtered signal output at timing n .

The quantizers 411B and 421B are mainly used to perform mapping processing on the filtered signals filtered by the operators 411A and 421A, so as to quantize the filtered signals into corresponding first code values (or second code values). In a preferred embodiment, the mapping can be performed by the Rounding function to round the received sensing signal to a specified length or effective number of bits to provide a value that can be effectively output.

The Rounding function may be, for example, a Floor function, a Ceil function, a Round function, an Int function, or an Int+sign function. Among them, the definitions of these functions are as follows: Floor function: the function value (f(x)) is returned to the parameter value not greater than the variable value (x) to the specified number of digits.

Ceil function: the function value (f(x)) returns to the parameter value not less than the variable value (x) to the specified number of digits.

Round function: The function value (f(x)) is the parameter value of the variable value (x) rounded to the specified number of digits.

Int function: If the variable value (x) is greater than or less than 0, the function value (f(x)) is unconditionally rounded to the parameter value of the specified number of bits; if the variable value (x) is equal to 0, the function value (f(x) )) is equal to 0.

Int+sign function: If the variable value (x) is greater than or less than 0, the function value (f(x)) is unconditionally carried to the parameter value of the specified number of bits; if the variable value (x) is equal to 0, the function value (f( x)) is equal to 0.

The quantized first code value (or second code value) is converted to the corresponding modulation level through the mapping modules 412 and 422. The conversion table of the code value and the modulation level is shown in the following table:

The finally obtained modulation level is summed with the first color temperature modulation signal (or second color temperature modulation signal) to correct the first color temperature modulation signal (second color temperature modulation signal), thereby gradually correcting the first output signal (second color temperature modulation signal) Output signal) and output to the drivers of the first mixed light source 10 and the second mixed light source 20 to make the first output signal (second output signal) gradually approach the first target value (second target value).

To sum up, the present invention can make the output of the LED lamp have the effect of gradual color temperature, and avoid the discomfort of the eyes caused by the instant brightness change in the environment, and even the long-term damage to the retina. In addition, the present invention uses the ambient light source as a reference, and uses the condition of the ambient light source as the feedback to modulate the color temperature of the output to increase the comfort of the user's eyes.

The present invention has been described in detail above, but what has been described above is only a preferred embodiment of the present invention. It should not be used to limit the scope of implementation of the present invention, that is, everything made in accordance with the scope of the patent application of the present invention is equal Changes and modifications should still fall within the scope of the patent of the present invention.

100‧‧‧Color temperature smoothing output system

10‧‧‧First mixed light source

20‧‧‧Second mixed light source

30‧‧‧Light Sensor

40‧‧‧Controller

41‧‧‧The first noise shaping modulator

42‧‧‧The second noise shaping modulator

4A‧‧‧Input terminal

4B‧‧‧Input terminal

4C‧‧‧First output

4D‧‧‧Second output

Claims (6)

A color temperature smoothing output system includes: a first mixed light source for controlling the output power of the first color temperature according to a first output signal; a second mixed light source for controlling the second color temperature according to the second output signal Output power; a light sensor for obtaining the color temperature of the ambient light; and a controller, connected or coupled to the first light mixing light source, the second light mixing light source, and the light sensor, the The controller includes: an input terminal connected to or coupled to the light sensor, and the light sensor receives a sensing signal including a first color temperature modulation signal and a second color temperature modulation signal; a first output terminal connected to Or coupled to the first mixed light source, the first output signal of the first output terminal is modulated according to the first color temperature modulation signal received by the light sensor by the controller as a control variable; and A second output terminal is connected or coupled to the second light mixing light source, and the second output signal of the second output terminal is controlled according to the second color temperature modulation signal received by the light sensor by the controller The variable is modulated accordingly; wherein the controller compares the first color temperature modulation signal with a first target value and feeds back the first error value to a first noise-correcting modulator, the first The noise rectifying modulator corrects the first color temperature modulation signal according to the first error value to output the first output signal; the controller compares the second color temperature modulation signal with a second target value and then The second error value is fed back to a second noise-correcting modulator, and the second noise-correcting modulator corrects the second color temperature modulation signal according to the second error value to output the second output signal. For the color temperature smoothing output system described in item 1 of the scope of patent application, the first noise-shaping modulator includes a bit quantization module and a mapping module, and the bit quantization module is based on the The expansion ratio between the first color temperature modulation signal and the first target value obtains the light level adjustment signal, and the light level adjustment signal is used to remove low-frequency noise through an operator, and is mapped to a first code value through a quantizer. The module sums up the corresponding modulation level and the first color temperature modulation signal according to the first code value to correct the first color temperature modulation signal, and outputs the first color temperature modulation signal as the first output signal to the first mixed light source for gradual progress Dimming. For the color temperature smoothing output system described in item 1 of the scope of patent application, the second noise shaping modulator includes a bit quantization module and a mapping module, and the bit quantization module is based on the The expansion ratio between the second color temperature modulation signal and the second target value obtains the light level adjustment signal, and the light level adjustment signal is used to remove low-frequency noise through an operator, and is mapped to a second code value through a quantizer. The module sums up the corresponding modulation level and the second color temperature modulation signal according to the second code value to correct the second color temperature modulation signal, and outputs the second color temperature modulation signal as the second output signal to the second mixed light source for gradual progress Dimming. A controller includes: an input terminal for receiving a sensing signal including a first color temperature modulation signal and a second color temperature modulation signal; a first output terminal, the first output signal of the first output terminal is based on the controller The received first color temperature modulation signal is used as a control variable to be modulated accordingly; and a second output terminal. The second output signal of the second output terminal is based on the second color temperature modulation signal received by the controller As a control variable, it is modulated accordingly; wherein the controller compares the first color temperature modulation signal with a first target value and feeds back the first error value to a first noise-correcting modulator, the The first noise-correcting modulator modifies the first color temperature modulation signal according to the first error value to output the first output signal; the controller compares the second color temperature modulation signal with a second target value and compares The second error value is fed back to a second noise-correcting modulator, and the second noise-correcting modulator corrects the second color temperature modulation signal according to the second error value to output the second output signal. According to the color temperature smoothing output system described in item 4 of the scope of patent application, the first noise shaping modulator includes a bit quantization module and a mapping module, and the bit quantization module is based on the The expansion ratio between the first color temperature modulation signal and the first target value obtains the light level adjustment signal, and the light level adjustment signal is used to remove low-frequency noise through an operator, and is mapped to a first code value through a quantizer. The module will output the corresponding modulation level and the first color temperature modulation signal according to the first code value to correct The first color temperature modulation signal is output as the first output signal for progressive dimming. According to the color temperature smoothing output system described in item 4 of the scope of patent application, the second noise shaping modulator includes a bit quantization module and a mapping module, and the bit quantization module is based on the The expansion ratio between the second color temperature modulation signal and the second target value obtains the light level adjustment signal, and the light level adjustment signal is used to remove low-frequency noise through an operator, and is mapped to a second code value through a quantizer. The module outputs the corresponding modulation level and the second color temperature modulation signal according to the second code value to correct the second color temperature modulation signal, and outputs it as the second output signal for gradual dimming.

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