CN204614417U - An LED display screen with pure hardware control of luminous brightness - Google Patents

Abstract

An LED display screen with pure hardware control of luminous brightness, comprising a display module, an oscillator and an LED display screen, characterized in that: the display module includes a photometric sensor and an LCD display screen, the photometric sensor is connected to the LCD display screen, and the The LED display screen is respectively connected with a display module and an oscillator, the display module is connected with an oscillator, and the oscillator is connected with an LED display screen; Brightness value, and transmit the brightness value to the oscillator, the oscillator compares the obtained brightness value with the preset value, when the brightness is not equal to the preset value, adjust the PWM duty cycle, so that the brightness value is close to the preset value, When the brightness value reaches the preset value, the oscillator frequency remains unchanged, and the LED display maintains the current brightness.

Description

An LED display screen with pure hardware control of luminous brightness

technical field

The utility model relates to the technical field of electronic display screens, in particular to an LED display screen whose luminous brightness is controlled by pure hardware.

Background technique

With the rapid development of LED (Light Emitting Diode, light emitting diode) technology, the performance of LED has been greatly improved, which has the advantages of long life, high luminous efficiency, no radiation and low power consumption. Due to its many advantages such as high visibility, low power consumption, free assembly and low cost, LED display has been widely used in various occasions such as outdoor billboards, advertisements and daily life to display various information. In recent years, as LED display screens are more and more widely used in the industrial field, people have become more and more strict about the brightness of LED light. However, the existing technology is still not mature enough to grasp the brightness of LED display screens. For example, when the intensity of sunlight is high, if the brightness of the display screen is not enough, the displayed content of the display screen will not be clear. When the brightness of the sun is low or at night, if the brightness of the display screen is high, it will dazzle the viewers and waste electric energy at the same time.

Utility model content

Aiming at the deficiencies of the existing technology, the utility model provides an LED display screen with pure hardware control of luminous brightness, which is convenient for controlling the variation range of the light brightness of the LED display screen, meets the actual brightness requirement, and enables the LED display screen to be used in the industrial application field More mature, richer and more usable.

The technical solution adopted by the utility model to solve the above-mentioned technical problems is: a kind of LED display screen with pure hardware control of luminous brightness, including a display module, an oscillator and an LED display screen; the display module includes a photometric sensor and an LCD display screen, and the The photometric sensor is connected to the LCD display screen, the LED display screen is connected to the display module and the oscillator respectively, the display module is connected to the oscillator, and the oscillator is connected to the LED display screen; the photometric sensor is used to detect the LED display Screen brightness, the detected brightness value is displayed on the LCD screen, and the brightness value is sent to the oscillator, and the oscillator compares the obtained brightness value with the preset value. When the brightness is not equal to the preset value, adjust the brightness value to be close to the preset value. Set the value, when the brightness value reaches the preset value, the oscillator frequency remains unchanged, and the LED display maintains the current brightness.

Further, the oscillator is a pulse oscillator with adjustable duty ratio.

Further, the adjustment range of the oscillator PWM (Pulse Width Modulation, pulse width modulation) is 0-100%.

Further, the oscillator is an adjustable duty cycle circuit with a 555 timer as the core.

Further, the duty cycle of the oscillator is adjusted through an adjustable resistor.

The utility model has the advantages: the PWM wave in the range of 0-100% is generated by the pure hardware circuit, saving time and cost; by controlling the variation range of the light brightness of the LED display screen, the actual required brightness requirement is achieved, and the LED display screen can be used in the industry The use of the application field is more mature and richer, and the practicability is enhanced; at the same time, the utility model also helps the LED display screen to make a more practical LED display screen in actual production, and improves the cost performance of the product.

Description of drawings

Fig. 1 is a design block diagram of the utility model;

Figure 2 is an adjustable circuit diagram of the duty cycle.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described further, as shown in Figure 1, 2, a kind of LED display screen of pure hardware control luminous brightness of the present utility model, comprises display module, oscillator and LED display screen; The module includes a photometric sensor and an LCD display, the photometric sensor is connected to the LCD display, the LED display is respectively connected to a display module and an oscillator, the display module is connected to an oscillator, and the oscillator is connected to the LED display Connected; the photometric sensor is used to detect the brightness of the LED display screen, the detected brightness value is displayed through the LCD display screen, and the brightness value is transmitted to the oscillator, and the oscillator compares the obtained brightness value with the preset value, when the brightness is not equal to When the preset value is reached, adjust the PWM duty cycle so that the brightness value is close to the preset value. When the brightness value reaches the preset value, the oscillator frequency remains unchanged and the LED display maintains the current brightness.

The oscillator is an adjustable pulse oscillator with a duty cycle, and the PWM adjustment range of the oscillator is 0-100%. The oscillator is an adjustable duty cycle circuit with a 555 timer as the core, and the oscillator The duty cycle is adjusted by an adjustable resistor.

Claims (5)

1. the LED display of a pure hardware controls luminosity, comprise display module, oscillator and LED display, it is characterized in that: described display module comprises luminosity sensor and LCD display, described luminosity sensor is connected with LCD display, described LED display is connected with oscillator with display module respectively, described display module is connected with oscillator, and described oscillator is connected with LED display; Described luminosity sensor is for detecting LED display brightness, by LCD display display sensed luminance value, and send brightness value to oscillator, the brightness value of acquisition compared with preset value, when brightness is not equal to preset value, is adjusted PWM dutycycle by oscillator, brightness value is made to be similar to preset value, when brightness value reaches preset value, oscillator frequency is constant, and LED display maintains present intensity.

2. the LED display of a kind of pure hardware controls luminosity according to claim 1, is characterized in that: described oscillator is dutycycle adjustable pulse oscillator.

3. the LED display of a kind of pure hardware controls luminosity according to claim 1, is characterized in that: the PWM range of adjustment of described oscillator is 0-100%.

4. the LED display of a kind of pure hardware controls luminosity according to any one of claim 1-3, is characterized in that: the dutycycle conditioned circuit that described oscillator is is core with 555 timers.

5. the LED display of a kind of pure hardware controls luminosity according to claim 4, is characterized in that: the dutycycle of described oscillator is regulated by adjustable resistance.