CN213213698U - Television signal measuring device based on screen brightness adjustment - Google Patents
Television signal measuring device based on screen brightness adjustment Download PDFInfo
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- CN213213698U CN213213698U CN202022716346.5U CN202022716346U CN213213698U CN 213213698 U CN213213698 U CN 213213698U CN 202022716346 U CN202022716346 U CN 202022716346U CN 213213698 U CN213213698 U CN 213213698U
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Abstract
The utility model provides a television signal measuring device based on screen brightness control, it includes the control unit and power supply unit, the control unit includes signal processing circuit, main control circuit, display element and screen brightness control circuit, power supply unit is used for providing drive voltage for main control circuit, signal processing circuit is connected with signal input part, and each way signal to main control circuit after the output processing, main control circuit's output control screen brightness control circuit, screen brightness control circuit's output is connected to the display element. Use the utility model discloses can utilize the ambient light intensity to come real-time regulation screen brightness, need not manual regulation, can improve work efficiency, reduce cost.
Description
Technical Field
The utility model relates to a television signal measures technical field, especially relates to a television signal measuring device based on screen brightness control.
Background
Cable digital tv, satellite digital tv and terrestrial digital tv are now rapidly developing all over the world, and in the process of popularization of digital video broadcasting, the problem that must be solved is the reception debugging of digital signals. In the traditional mode, people debug and receive signals by continuously and manually adjusting an antenna, but the mode takes long time, the obtained signals are often unsatisfactory, different broadcast standards exist in different regions in the world, and under the environment, a multi-standard digital television signal measuring instrument which is a product convenient for digital video broadcast installation and debugging is produced.
The multi-standard digital television signal measuring instrument is a portable instrument product which is specially applied to the field of broadcast television and is used for measuring and analyzing signals. This product supports functions such as satellite, ground, wired signal power measurement, spectral analysis, code stream are recorded, video monitoring, and not only so, this instrument can also measure the channel index of radio frequency signal, includes: BER, MER, SNR, constellation, spectrum, etc.
When the television signal analyzer on the market works in application scenes with different brightness, the screen brightness cannot be automatically adjusted according to the environment brightness, and the specified menu needs to be manually entered for adjustment.
Because brightness adjustment is not intelligent, influences the installation effectiveness, and satellite antenna installation generally goes on outdoors, and screen brightness need rise under the sunlight, and screen brightness reduces the protection eyesight when the indoor measurement circuit signal that the light is darker, and it has longer duration to turn down the luminance to do benefit to television signal measuring apparatu battery.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an utilize the strong and weak TV signal measuring device based on screen brightness control who comes real-time regulation screen brightness of ambient light, need not manual regulation, can improve work efficiency, reduce cost.
In order to realize the above-mentioned main objective, the utility model provides a pair of TV signal measuring device based on screen brightness control, include the control unit and do the power supply unit of the control unit output electric energy, the control unit includes signal processing circuit, main control circuit, display element and is used for controlling the screen brightness control circuit of display screen luminance, the power supply unit is used for providing driving voltage and gives main control circuit, signal processing circuit is connected with signal input part to each way signal after the output processing extremely main control circuit, main control circuit's output control screen brightness control circuit, screen brightness control circuit's output is connected to the display element.
In a further scheme, the screen brightness control circuit comprises a PWM signal generating chip, a photodetector, a backlight driving chip and a DC/DC boost converter, the photodetector is connected to an input terminal of the PWM signal generating chip, an output terminal of the PWM signal generating chip is connected to an input terminal of the backlight driving chip, and an output terminal of the backlight driving chip is connected to the DC/DC boost converter.
In a further scheme, the optical detector is mounted at the upper end of the product surface cover and used for detecting an external environment optical signal.
In a further embodiment, the light detector is a photodiode.
In a further scheme, a first resistor and a second resistor are sequentially connected in series with the anode of the photodiode.
In a further aspect, a third pin of the PWM signal generating chip detects a voltage difference between the first resistor and the second resistor, and outputs a corresponding PWM signal through a fourth pin thereof to control an output power of the backlight driving chip.
In a further aspect, the DC/DC boost converter includes a first inductor, a schottky diode, an LCD positive output terminal, an LCD negative output terminal, a first capacitor and a second capacitor connected to the LCD positive output terminal, and a third resistor and a fourth resistor connected to the LCD negative output terminal, two ends of the first inductor are connected between the first pin and the sixth pin of the backlight driving chip, an anode of the schottky diode is connected to the first pin of the backlight driving chip, and a cathode of the schottky diode is connected to the first capacitor, the second capacitor and the LCD positive output terminal.
In a further scheme, the display unit comprises a display screen, a display driving circuit and a power amplifier circuit, and audio and video signals output by the main control circuit are driven by the display driving circuit to be displayed on the display screen and sent out by the power amplifier circuit.
In a further aspect, the main control circuit includes a main control chip, a media processing unit, a storage unit, and an external interface circuit, and the main control chip is connected to the media processing unit, the storage unit, and the external interface circuit, respectively.
Therefore, the utility model provides a television signal measuring device is mainly by the power supply, signal processing, main control, it constitutes to show four parts, the problem of regularly perhaps manually carrying out screen brightness control's not enough intellectuality has been solved, brightness control automation has been guaranteed, easy to assemble workman has better operation under the environment light brightness of difference to experience, installer has better operation under the environment light brightness of difference to experience, protect eyesight under the low light, save battery power, whole process does not need manually to operate screen brightness, to whole work efficiency have certain promotion.
Drawings
Fig. 1 is a schematic diagram of an embodiment of the present invention, which is a television signal measuring device based on screen brightness adjustment.
Fig. 2 is a schematic circuit diagram of a screen brightness control circuit in an embodiment of a television signal measuring apparatus based on screen brightness adjustment.
The present invention will be further explained with reference to the drawings and examples.
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined below to clearly and completely describe the technical solution of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be obtained by a person skilled in the art without any inventive work based on the described embodiments of the present invention, belong to the protection scope of the present invention.
Referring to fig. 1, the utility model discloses a television signal measuring device based on screen brightness adjustment, including the control unit 10 and for the power supply unit 20 of the control unit 10 output power, the control unit 10 includes signal processing circuit 11, main control circuit 12, display element 30 and be used for controlling the screen brightness control circuit 31 of display screen luminance, power supply unit 20 is used for providing driving voltage for main control circuit 12, signal processing circuit 11 is connected with signal input part, and each way signal after the output processing to main control circuit 12, main control circuit 12's output control screen brightness control circuit 31, screen brightness control circuit 31's output is connected to display element 30.
The television signal measuring apparatus of the present embodiment is an improvement made on the basis of the existing multi-standard digital television signal measuring apparatus. The instrument is automatic to be increaseed screen brightness in order to obtain better visual effect under the highlight, otherwise then the luminance is transferred down, has saved the power consumption when protecting the eyesight, and whole process need not manually operate screen brightness, has certain promotion to whole work efficiency.
Referring to fig. 2, the screen brightness control circuit 31 includes a PWM signal generating chip UA01, a photo detector, a backlight driving chip UA04, and a DC/DC boost converter, the photo detector is connected to an input terminal of the PWM signal generating chip UA01, an output terminal of the PWM signal generating chip UA01 is connected to an input terminal of the backlight driving chip UA04, and an output terminal of the backlight driving chip UA04 is connected to the DC/DC boost converter.
In this embodiment, the optical detector is installed at the upper end of the product surface cover and is used for detecting the external environment light signal.
Preferably, the light detector is a photodiode DU 01.
The positive electrode of the photodiode DU01 is connected in series with a first resistor and a second resistor.
The third pin of the PWM signal generating chip UA01 detects the voltage difference between the resistor RU01 and the resistor RU02, and outputs a corresponding PWM signal through the fourth pin thereof to control the output power of the backlight driving chip UA 04.
In this embodiment, the DC/DC boost converter includes an inductor LA03, a schottky diode DA28, an LCD positive output terminal, an LCD negative output terminal, a capacitor CA58 connected to the LCD positive output terminal, a capacitor CA57, and a resistor RA107 and a resistor RA103 connected to the LCD negative output terminal, two ends of the inductor LA03 are connected between the first pin and the sixth pin of the backlight driving chip UA04, an anode of the schottky diode DA28 is connected to the first pin of the backlight driving chip UA04, and a cathode of the schottky diode DA28 is connected to the capacitor CA58, the capacitor CA57 and the LCD positive output terminal.
Specifically, the PWM signal generation chip UA01 outputs a PWM waveform according to the voltage level of the third pin thereof. The photodiode DU01, also called a photodiode, is a light detector that can convert light intensity into a current or voltage signal. The tube core of the LED chip is usually provided with a PN junction with photosensitive characteristics, is very sensitive to light change, has unidirectional conductivity, and changes electrical characteristics when light intensity is different.
The backlight driving chip UA04 is an AP3031 chip, and is a chip specially used for driving a liquid crystal display backlight array, and the backlight driving chip UA04, an inductor LA03 and peripheral elements thereof form a DC/DC boost converter.
The photosensitive diode DU01 is positioned at the upper end of the product surface cover, can detect the external environment light in real time, has small resistance under strong light and large resistance under weak light, the voltage 3.3V is connected with two resistors RU01 and RU02 after passing through DR01 in series, the third pin of the PWM signal generating chip UA01 reads the voltage change between the two resistors, and the fourth pin outputs the corresponding pulse width modulation waveform (PWM) to control the output power of the backlight driving chip UA04, thereby achieving the purpose of controlling the brightness of the screen backlight, therefore, the circuit can realize the real-time adjustment of the screen brightness by utilizing the intensity of the environment light.
PWM: the (Pulse Width Modulation) Pulse Width Modulation technique equivalently obtains a desired waveform by modulating the Width of a series of pulses. Pulse width modulation basic principle: the control mode is to control the on-off of the switch device of the inverter circuit, so that a series of pulses with equal amplitude are obtained at the output end, and the pulses are used for replacing sine waves or required waveforms. That is, a plurality of pulses are generated in a half cycle of an output waveform, and the equivalent voltage of each pulse is a sine waveform, so that the obtained output is smooth and has few low-order harmonics. The width of each pulse is modulated according to a certain rule, so that the magnitude of the output voltage of the inverter circuit can be changed, and the output frequency can also be changed.
The main control circuit 12 includes a main control chip 121, a media processing unit 123, a storage unit 122, and an external interface circuit 124, and the main control chip 121 is connected to the media processing unit 123, the storage unit 122, and the external interface circuit 124 respectively. Specifically, the main control chip 121 runs a real-time operating system, the media processing unit 123 receives each standard transport stream and outputs audio/video signals to the outside, and the external interface circuit 124 includes various communication interfaces, information input interfaces, audio/video output and other extension interfaces.
The power supply unit 20 converts the voltage of the adapter 21 and the battery power supply 22 to meet the power supply requirements of the product, and the adapter 21 charges the battery power supply 22 at the same time.
The satellite, terrestrial and cable television signals are input from the rf terminal of the signal processing circuit 11, and the signal processing circuit 11 down-converts and demodulates the signals of each channel, and outputs the standard transport stream to the main control chip 121.
The display unit 30 includes a display screen, a display driving circuit and a power amplifier circuit, and the audio/video signal output by the main control circuit 12 drives the display screen to display and the power amplifier circuit to send a power amplifier signal through the display driving circuit.
Therefore, the utility model provides a television signal measuring device is mainly by the power supply, signal processing, main control, it constitutes to show four parts, the problem of regularly perhaps manually carrying out screen brightness control's not enough intellectuality has been solved, brightness control automation has been guaranteed, easy to assemble workman has better operation under the environment light brightness of difference to experience, installer has better operation under the environment light brightness of difference to experience, protect eyesight under the low light, save battery power, whole process does not need manually to operate screen brightness, to whole work efficiency have certain promotion.
It should be noted that the above is only the preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and all the insubstantial modifications made by using the design concept of the present invention also fall within the protection scope of the present invention.
Claims (9)
1. A television signal measuring device based on screen brightness adjustment comprises a control unit and a power supply unit for outputting electric energy to the control unit, and is characterized in that:
the control unit comprises a signal processing circuit, a main control circuit, a display unit and a screen brightness control circuit for controlling the brightness of the display screen, the power supply unit is used for providing driving voltage for the main control circuit, the signal processing circuit is connected with a signal input end and outputs processed signals to the main control circuit, the output end of the main control circuit controls the screen brightness control circuit, and the output end of the screen brightness control circuit is connected to the display unit.
2. The television signal measurement device of claim 1, wherein:
the screen brightness control circuit comprises a PWM signal generating chip, a light detector, a backlight driving chip and a DC/DC boost converter, wherein the light detector is connected to the input end of the PWM signal generating chip, the output end of the PWM signal generating chip is connected with the input end of the backlight driving chip, and the output end of the backlight driving chip is connected with the DC/DC boost converter.
3. The television signal measurement device of claim 2, wherein:
the optical detector is arranged at the upper end of the product surface cover and used for detecting an external environment optical signal.
4. The television signal measurement device of claim 3, wherein:
the light detector is a photosensitive diode.
5. The television signal measurement device of claim 4, wherein:
the positive pole of the photosensitive diode is sequentially connected with a first resistor and a second resistor in series.
6. The television signal measurement device of claim 5, wherein:
and a third pin of the PWM signal generating chip detects the voltage difference between the first resistor and the second resistor, and outputs a corresponding PWM signal through a fourth pin to control the output power of the backlight driving chip.
7. The television signal measurement device of claim 2, wherein:
the DC/DC boost converter comprises a first inductor, a Schottky diode, an LCD positive output end, an LCD negative output end, a first capacitor and a second capacitor which are connected to the LCD positive output end, a third resistor and a fourth resistor which are connected to the LCD negative output end, wherein two ends of the first inductor are connected between a first pin and a sixth pin of the backlight driving chip, the anode of the Schottky diode is connected to the first pin of the backlight driving chip, and the cathode of the Schottky diode is connected to the first capacitor, the second capacitor and the LCD positive output end.
8. The television signal measurement device of any of claims 1 to 7, wherein:
the display unit comprises a display screen, a display driving circuit and a power amplifier circuit, and audio and video signals output by the main control circuit are driven by the display driving circuit to be displayed on the display screen and sent by the power amplifier circuit to be amplified.
9. The television signal measurement device of any of claims 1 to 7, wherein:
the main control circuit comprises a main control chip, a media processing unit, a storage unit and an external interface circuit, and the main control chip is respectively connected with the media processing unit, the storage unit and the external interface circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022716346.5U CN213213698U (en) | 2020-11-20 | 2020-11-20 | Television signal measuring device based on screen brightness adjustment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022716346.5U CN213213698U (en) | 2020-11-20 | 2020-11-20 | Television signal measuring device based on screen brightness adjustment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213213698U true CN213213698U (en) | 2021-05-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022716346.5U Active CN213213698U (en) | 2020-11-20 | 2020-11-20 | Television signal measuring device based on screen brightness adjustment |
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| Country | Link |
|---|---|
| CN (1) | CN213213698U (en) |
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2020
- 2020-11-20 CN CN202022716346.5U patent/CN213213698U/en active Active
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