CN104184924B - Display method of LED smart glass - Google Patents

Abstract

the embodiment of the invention provides a display method of L ED intelligent glass.

Description

Display method of LED smart glass

technical field

Embodiments of the present invention relate to the field of electrical communication, and in particular, to a display method of LED smart glass.

Background technique

LED smart glass, also known as electrified luminous glass or electroluminescent glass, was first invented in Germany and successfully developed in China in 2006. It has the characteristics of transparency, anti-riot, waterproof, anti-ultraviolet, and designable. Mainly used in indoor and outdoor decoration, furniture design, lamp lighting design, outdoor curtain wall glass, sun room design and other fields. The form of completely transparent glass is combined with colorful light elements, and it has multiple safety protection properties, making it more conducive to various design applications. LED glass has flexible structural configuration, no matter the glass size such as size and thickness, or LED pattern can be freely designed and selected to meet the needs of architecture, decoration or lighting assistance, it has strong scalability and diversity, and can be used for glass. Punching or multi-style cutting to meet the requirements of specific projects. LED glass can cooperate with the intelligent signal control system to control the LED lighting built in the glass to produce flickering, gradient and other effects. At the same time, a single piece of LED glass can be used as a dynamic unit to perform combined and interactive special lighting effects to meet the environment or architecture. Its own requirements for light and design elements.

Since LED smart glass has the characteristics of LED display, but the LED display characteristics cannot be fully adapted to LED smart glass, resulting in noise and distortion problems when LED smart glass displays video images.

Contents of the invention

An embodiment of the present invention provides a display method for LED smart glass to overcome the technical problems of noise and distortion when displaying video images on LED smart glass in the prior art.

An embodiment of the present invention provides a display method for LED smart glass, including:

The processor receives a video signal, and the video signal includes a control signal, a clock signal and an image pixel gray value;

The processor obtains the correction value of the pixel gray value of the displayed image according to the threshold current of the LED and the gray value of the pixel of the image;

The processor adjusts the image pixel gray value according to the correction value of the image pixel gray value;

The processor sends the adjusted image pixel gray value to the driving device for the LED smart glass to display the video signal.

Further, the processor calculates the correction value of the pixel gray value of the displayed image according to the threshold current of the LED and the gray value of the image pixel, including:

The processor uses the formula

n=a*TM/I _in (1)

Calculate the correction value of the image pixel grayscale value according to the LED threshold current, wherein the n is the first correction value of the image pixel grayscale value, the a is the LED threshold current, and the TM is a binary number corresponding to M bits , the I _in is the maximum current input by the LED;

The processor adjusts the image pixel gray value according to the correction value of the image pixel gray value, including;

If the image pixel gray value is less than the corrected value of the image pixel gray value, the formula

X ₁ ＝X+a*TM/I _in (2)

Calculate the first adjusted image pixel gray value, and adjust the image pixel gray value according to the first adjusted image pixel gray value, wherein, the X ₁ is the first adjusted image pixel gray value, so Said X is the image pixel gray value;

or,

If the image pixel gray value is greater than the correction value of the image pixel gray value, the formula

X ₁ ＝X*(TM-a*TM/I _in )/(I _in -2a) (3)

calculating a first adjusted image pixel grayscale value, and adjusting the image pixel grayscale value according to the first adjusted image pixel grayscale value.

Further, the processor calculates the correction value of the pixel gray value of the displayed image according to the threshold current of the LED and the gray value of the image pixel, including:

The processor uses the formula

△X＝P*K*3*12*f/F (4)

Calculate the correction value, wherein, the △X is the second correction value, the P is the average gray value of the image, the K is the number of LEDs, each LED is divided into three components R, G, and B, each Each component is 12-bit data, said F is a system clock, and said f is a frame frequency;

The processor adjusts the image pixel gray value according to the correction value of the image pixel gray value, including:

The processor uses the formula

X ₂ =X ₁ -△X (5)

Adjusting the image pixel grayscale value, wherein the X ₁ is the image pixel grayscale value, the X ₂ is the second adjusted image pixel grayscale value, and the ΔX is the second correction value.

Further, after the processor sends the adjusted image pixel gray value to the driving device for the LED smart glass to display the video signal, it also includes:

The processor receives an external light intensity signal;

The processor adjusts the LED input current according to the light intensity signal.

Further, the processor adjusts the LED input current according to the light intensity signal, including:

The processor uses the formula

I _led -Ib＝C (6)

Calculate the LED input current value, and adjust the input current of the LED according to the external light intensity current value, wherein, the C is the sensitive light intensity constant, the I _led is the LED input current, and the Ib is the corresponding value of the external light intensity current value.

In the embodiment of the present invention, the processor obtains the threshold gray scale from the LED threshold current, adjusts the gray scale signal in the received video signal according to the threshold gray scale, and sends the adjusted gray scale signal to the driving device for LED The smart glass displays the video signal, which solves the problem of noise and distortion in the prior art when the LED smart glass displays video images, and improves the display accuracy of the LED smart glass.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is the flow chart of the display method of LED smart glass of the present invention;

Fig. 2 is a schematic diagram of the relationship between LED gray scale and current mapping in the present invention;

Fig. 3 is a schematic diagram of the relationship between LED gray scale and background photocurrent mapping in the present invention;

Fig. 4 is the schematic diagram of adjusting background noise duty ratio of LED of the present invention;

Fig. 5 is another flow chart of the display method of the LED smart glass of the present invention;

Fig. 6 is a schematic diagram of the relationship between LED threshold and luminous intensity in the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Fig. 1 is a flow chart of the display method of LED smart glass of the present invention, as shown in Fig. 1, the method of this embodiment may include:

Step 101, the processor receives a video signal, and the video signal includes a control signal, a clock signal and an image pixel gray value;

Step 102, the processor obtains the correction value of the pixel gray value of the displayed image according to the threshold current of the LED and the gray value of the image pixel;

Specifically, the LED has a threshold current. When the current passing through the LED is greater than the threshold current, the LED can display the corresponding video signal. When the current passing through the LED is less than the threshold current, the LED will not be lit, that is, the video signal cannot be displayed. The corresponding image causes image distortion. In addition, the display composed of multiple pieces of LED smart glass is input in serial, so there is a certain transition time in the process of image data being serialized in and out, which will generate background noise current, which will cause image display During the process, multiple pieces of LED smart glass cannot display images at the same time.

Step 103, the processor adjusts the image pixel gray value according to the correction value of the image pixel gray value;

Step 104, the processor sends the adjusted image pixel grayscale value to the driving device for the LED smart glass to display the video signal.

Further, the processor calculates the correction value of the pixel gray value of the displayed image according to the threshold current of the LED and the gray value of the image pixel, including:

The processor uses the formula

n=a*TM/I _in (1)

Calculate the correction value of the image pixel grayscale value according to the LED threshold current, wherein the n is the first correction value of the image pixel grayscale value, the a is the LED threshold current, and the TM is a binary number corresponding to M bits , the I _in is the maximum current input by the LED;

The processor adjusts the image pixel gray value according to the correction value of the image pixel gray value, including;

If the image pixel gray value is less than the corrected value of the image pixel gray value, the formula

X ₁ ＝X+a*TM/I _in (2)

Calculate the first adjusted image pixel gray value, and adjust the image pixel gray value according to the first adjusted image pixel gray value, wherein, the X ₁ is the first adjusted image pixel gray value, so Said X is the image pixel gray value;

or,

If the image pixel gray value is greater than the correction value of the image pixel gray value, the formula

X ₁ ＝X*(TM-a*TM/I _in )/(I _in -2a) (3)

calculating a first adjusted image pixel grayscale value, and adjusting the image pixel grayscale value according to the first adjusted image pixel grayscale value.

Specifically, because the LED smart glass has the characteristics of LED display, that is, the LED has a corresponding threshold current, when the input current of the LED is less than the threshold current, the LED cannot display the corresponding pixel of the input video image. Problems that cause loss or noise in the video image. The processor of this embodiment obtains the threshold grayscale corresponding to the LED according to the LED threshold current, and uses formula (2) to calculate and adjust the grayscale value of the image pixel for the image pixel grayscale value in the received video signal that is less than the threshold grayscale, and according to This adjustment image pixel gray value adjusts the image pixel gray value in the video signal; adopts formula (3) to calculate and adjust the image pixel gray value for the received video signal greater than the image pixel gray value of the threshold gray value, and according to the Adjusting Image Pixel Gray Value Adjusts the image pixel gray value in the video signal. It avoids overlapping with the adjusted image pixel gray value in the original video signal which is smaller than the threshold gray value, resulting in video image distortion. Fig. 2 is a schematic diagram of the mapping relationship between LED gray level and current according to the present invention.

In this embodiment, the processor adjusts the grayscale value of the image pixel in the video signal according to the threshold grayscale corresponding to the threshold grayscale of the LED, and sends the adjusted grayscale value of the image pixel to the driving device The LED smart glass is used to display the video signal. The problem of image distortion when the LED smart glass displays video images in the prior art is solved, and the fidelity of the image displayed by the LED smart glass is improved.

Fig. 3 is a schematic diagram of the mapping relationship between LED gray level and background photocurrent according to the present invention, as shown in Fig. 3,

According to the threshold current of the LED and the gray value of the image pixel, the processor obtains the correction value of the gray value of the displayed image pixel, including:

The processor uses the formula

△X＝P*K*3*12*f/F (4)

Calculate the correction value, wherein, the △X is the second correction value, the P is the average gray value of the image, the K is the number of LEDs, each LED is divided into three components R, G, and B, each Each component is 12-bit data, said F is a system clock, and said f is a frame frequency;

The processor adjusts the image pixel gray value according to the correction value of the image pixel gray value, including:

The processor uses the formula

X ₂ =X ₁ -△X (5)

Adjusting the image pixel gray value, wherein, the X ₁ is the gray value of the first image pixel, the X ₂ is the second adjusted image pixel gray value, and the △X is the second correction value.

Due to the use of PWM serial data to modulate the grayscale signal, the LED serially passes through a lot of data during the transmission process, what is displayed is the background light noise, and what the human eye feels is the phenomenon of a white screen. By calculating △X, the data transmission After reaching the LED, it will be superimposed with the backlight noise to form a normal ideal mapping relationship as shown in 2 in Figure 3.

The curve of X ₂ is shown as 1 in Figure 3, which is the mapping relationship between the current before reaching the LED and the gray value. △I is the current value corresponding to the correction value △X. The mapping relationship displayed by the LED is shown in the curve 2 in Figure 3, that is, the white light in the background is eliminated, so that the mapping relationship reaches a normal display relationship, as shown in Figure 3.

Display background noise = transition value - threshold (6)

Since the current value corresponding to △I is the transition value, the background noise can reach the comfort level of human eyes through the value of △I. That is, the white screen phenomenon of the display screen is eliminated. FIG. 4 is a schematic diagram of adjusting the duty cycle of background noise by LEDs of the present invention.

In this embodiment, the processor calculates the average gray value of the image, obtains the correction value of the image according to the average gray value of the image, and adjusts the digital gray signal according to the correction value, so as to prevent the video signal from being displayed in series on the LED smart glass. There is a phenomenon of noise, so LED smart glass displays images in serial display mode to achieve the effect of parallel display.

Fig. 5 is another flow chart of the display method of the LED smart glass of the present invention. As shown in Fig. 5, the method of this embodiment may further include on the basis of Fig. 1:

Step 105, the processor receives an external light intensity signal;

Step 106, the processor adjusts the LED input current according to the light intensity signal.

Further, the processor adjusts the LED input current according to the light intensity signal, including:

The processor uses the formula

I _led -Ib＝C (7)

Calculate the LED input current value, and adjust the input current of the LED according to the external light intensity current value, wherein, the C is a sensitive light intensity constant, the I _led is the LED input current, and the I _b is the corresponding external light intensity current.

Specifically, in this embodiment, a photoreceptor is used to receive the light intensity of the outside world, and other methods may also be used to collect the light intensity of the outside world, which is not limited in this embodiment. The light intensity is converted into a corresponding current value through the photoreceptor, and the current value is sent to the processor, and the processor adjusts the LED input current according to the formula (8). The calculation formula of the LED input current is

I _led ＝K*D*I _in /TM (8)

Wherein, the K is a self-adjustment constant, and the D is a grayscale signal. When the external light intensity increases, I _b becomes larger. In order to keep the C-sensitive light intensity constant unchanged, the current corresponding to the LED becomes larger, and K is greater than 1; when the external light intensity becomes weaker, I _b becomes smaller, in order to keep C The sensitive light intensity constant remains unchanged, the corresponding current of the LED becomes smaller, and K is less than 1. The photoreceptor collects the average light intensity of the day in advance and performs current conversion. When the external light intensity is consistent with the average light intensity, K is equal to 1. The grayscale display of the LED smart glass is adjusted according to the external light intensity, thus playing the role of energy saving. Fig. 6 is a schematic diagram of the relationship between LED threshold and luminous intensity in the present invention. When the current is less than the threshold a, the LED luminous intensity is 0, and when the LED input current reaches the maximum, the LED luminous intensity is maximum.

In this embodiment, after the video signal is fully displayed, the processor receives the external light intensity signal, adjusts the LED input current in real time according to the light intensity signal, and realizes the adjustment of the grayscale display of the LED smart glass according to the external light intensity. To the role of energy saving.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (4)

1. A display method for LED smart glass, comprising: The processor receives a video signal, and the video signal includes a control signal, a clock signal and an image pixel gray value; The processor obtains the correction value of the pixel gray value of the displayed image according to the threshold current of the LED and the gray value of the pixel of the image; The processor adjusts the image pixel gray value according to the correction value of the image pixel gray value; The processor sends the adjusted image pixel gray value to the driving device for the LED smart glass to display the video signal; Wherein, the adjustment step of the image pixel gray value comprises: Step 1, the processor adopts the formula n=a*TM/I _in (1) Calculate the correction value of the image pixel grayscale value according to the LED threshold current, wherein the n is the first correction value of the image pixel grayscale value, the a is the LED threshold current, and the TM is a binary number corresponding to M bits , the I _in is the maximum current input by the LED; Step 2. The processor adjusts the image pixel gray value according to the correction value of the image pixel gray value, including: If the image pixel gray value is less than the first correction value of the image pixel gray value, the formula X ₁ ＝X+a*TM/I _in (2) Calculate the first adjusted image pixel gray value, and adjust the image pixel gray value according to the first adjusted image pixel gray value, wherein, the X ₁ is the first adjusted image pixel gray value, so Said X is the image pixel gray value; or, If the image pixel gray value is greater than the first correction value of the image pixel gray value, the formula X ₁ ＝X*(TM-a*TM/I _in )/(I _in -2a) (3) calculating a first adjusted image pixel grayscale value, and adjusting the image pixel grayscale according to the first adjusted image pixel grayscale value. 2. The method according to claim 1, wherein the processor calculates the correction value of the pixel gray value of the displayed image according to the threshold current of the LED and the gray value of the image pixel, including: The processor uses the formula △X＝P*K*3*12*f/F (4) Calculate the correction value of the pixel gray value of the displayed image, wherein the △X is the second correction value, the P is the average gray value of the image, the K is the number of LEDs, and each LED is divided into R and G , B three components, each component is 12-bit data, the F is the system clock, and the f is the frame rate; The processor adjusts the image pixel gray value according to the correction value of the image pixel gray value, including: The processor uses the formula X ₂ =X ₁ -△X (5) Adjusting the image pixel gray value, wherein, the X ₁ is the first adjusted image pixel gray value, the X ₂ is the second adjusted image pixel gray value, and the △X is the second correction value. 3. The method according to any one of claims 1 to 2, characterized in that, after the processor sends the adjusted image pixel gray value to the driving device for the LED smart glass to display the video signal, include: The processor receives an external light intensity signal; The processor adjusts the LED input current according to the light intensity signal. 4. The method according to claim 3, wherein the processor adjusts the LED input current according to the light intensity signal, comprising: The processor uses the formula I _led -I _b ＝C (6) Calculate the LED input current value, and adjust the input current of the LED according to the external light intensity current value, wherein, the C is a sensitive light intensity constant, the I _led is the LED input current, and the I _b is the corresponding external light intensity current value.