In recent years, the rapid development of LED display technology, LED display equipment technology level and maturity are getting higher and higher, and the areas and content involved are more and more extensive. On the stage of TV art programs, taking the CCTV Spring Festival Gala as the representative, the most dazzling objective should be a variety of LED displays. Based on elaborate images and dynamic video images, they are virtually seamlessly connected from the up, down, left, and right sides of the stage to form a near-perfect stage space, supplemented by hundreds of mechanical lifting stages. The field of design of personnel has been further expanded from the original stage stage to truly make the dots, lines, and surfaces on the stage become part of the show of the art of dancing, and in combination with augmented reality technology, it has created an illusion for the audience. The artistic atmosphere has brought great impact and enjoyment to the audience.

However, the large-scale application of LED large screens also has some negative effects on the artistic creation of stage lighting. Xiao Bian summed up these adverse effects and found out how to reasonably use LED large screens to make the light and LED large screens combine perfectly and complement each other.

one

negative effect

(1) Nowadays, the stage of many evening parties is, to some extent, a large box that emits light. Its high brightness (although it can be adjusted), high color temperature, and rich colors are unprecedented. The stage light, especially the character's face, is more difficult to blend with, and often appears to be too prominent due to the background too bright, making the appearance of the person's face lack of illumination, pale gray, the screen is not transparent.

(2) On the traditional stage, the empty black part of the stage set for the stage is responsible for further creation and play by the light. The bright or dark light and the beautiful background form form a combination of reality and reality. The relationship, from point to line, is full of sense of space. In contrast, on the stage of some of today's parties, almost all corners are LED displays. Although the picture is beautiful, it gives people a feeling of being "full" and "blocking" and even giving people a sense of oppression. And once some of the screens are black backgrounds, it has not left sufficient space and space for the lights to make up for it. In a sense, this in itself violates the rules of dance design.

(3) LED screen patterns are often in conflict with the beam, pattern, and color of the computer light. From the perspective of CCTV's current practice, light is basically the sacrifice of its own effect to ensure the LED screen.

two

Solution

1 First of all, to change the lighting design concept

In the traditional TV lighting production, the contrast of the brightness of the object is reflected, and the camera truly restores the brightness of the captured object; if the illuminance and the contrast meet the requirements, the picture level, tone, and sharpness can achieve a satisfactory effect. After applying the LED large screen as the main background to the TV variety show, the lighting engineer must take into consideration its self-luminous characteristics when designing it. It is considered to be a large-scale LED lamp. Due to the different display of its video content, the brightness and darkness are different. There are also different changes in the colors. Without changing the effect of the dance and ensuring the basic illumination, the lighting layout is constantly adjusted. It is not only necessary to reasonably use the brightness and light ratio of the lights, but also to control the level contrast between the actors and the scenery. The actor and the luminous LED large screen balance the brightness, master the overall color change of the stage; make the color temperature tone of the evening party and the content harmonize with the content, let the LED large screen fully integrate into the TV stage, and integrate with the TV lighting, let the TV picture get real Natural color reproduction.

2 Second, adjust the light ratio, aperture, color temperature, video

(1) Dimming ratio

You can reduce the light ratio of the face to the background by increasing the brightness of the people in the arena or reducing the brightness of the large screen.

(2) Aperture

During the actual rehearsal of rehearsals, lighting technicians and video technicians will first determine a basic aperture range based on the form of the program. This range must always be ensured in the best working condition of the camera, that is, between F4 and F5.6. In this aperture range, the basic lighting layout required by the camera is completed, the brightness of the LED large screen is determined, and then the artistic lights of the computer light and the effect light are embellished. In this way, the video technicians of each program can adjust the aperture on a small scale to ensure the visual effect and technical quality of the screen.

(3) Balance color temperature

Nowadays, a large number of scanners are used to make surface light, that is, high color temperature lamps are used. Because the LED screen is a high color temperature device, if the computer lamp uses a low color temperature lamp of about 2800 K to 3200 K, and exposure is based on the exposure of the human face, the large LED screen shot will appear blue, making the color distorted; The light is adjusted to a high color temperature lamp, which is consistent with the large screen behind it, so that the image can be rendered in a consistent manner.

(4) The material displayed on the LED screen can be adjusted appropriately

Because of the use of large-scale LED screens, the resulting brightness directly affects the stage lighting. At the beginning of lighting design, we can first consider the large LED screen as part of the stage lighting. Measure the average brightness of all play materials, edit and adjust the brightness and color of the video footage of the played material in advance, and adjust the brightness according to the actual program background material and lighting design requirements without affecting the overall large screen effect. , and calculate the amount of light into the base illumination of the light, and consider the content of the large-screen playback material as part of the lighting design. This can also minimize the influence of the large screen on the control of the light and the aperture of the camera.