34results about How to "Balance brightness" patented technology

An optically controlled lighting group includes a plurality of optically controlled lighting devices, each of which includes a lighting main body, a dimming time controller and an optical detector. The light source is turned on during an on period corresponding to an on dimming signal, and the light source is turned off during an off period corresponding to the off dimming signal. If the ambient light intensity detected by the optical detector is different from a predetermined value, the light source is controlled by the dimming time controller. The light sources of the optically controlled lighting devices are sequentially and alternately enabled to illuminate at specified time intervals, and each of the specified time interval is shorter than the time period for producing persistence of vision.

In order to make a boundary inconspicuous, which is located between an image area which displays an image by translucent pixels and a dummy area which always displays a white color by reflection pixels, a size ratio of transparent areas in color filters of the reflection pixels with respect to reflection areas therein is made larger than a size ratio of transparent areas in color filters of the translucent pixels with respect to reflection areas therein. In such a way, brightness of the display is balanced by adjusting quantities of transmission light through the transparent areas of the reflection pixels with respect to quantities of reflection light generated unexpectedly on transmission areas of the translucent pixels. Then, degrees of whiteness in the translucent pixels and the reflection pixels are approximated to each other.

An image capturing device includes a plurality of light emitters, an image capturer, a memory and a processor. The memory stores a target brightness value. The processor controls the light emitters to emit light and controls the image capturer to capture an image. The image is divided into a plurality of areas and the light emitted by each of the light emitters corresponds to one of the areas. The processor calculates a current brightness value of each area and calculates an absolute difference between the current brightness value of each area and the target brightness value. The processor determines whether each absolute difference is larger than a first threshold. According to a determination result, the processor adjusts an exposure parameter of the image capturer or adjusts a light emitting intensity of the light emitter corresponding to the area with the absolute difference larger than the first threshold.

The invention relates to a multichannel projection fusion band color automatic balance control method based on image recognition. The method includes following steps: setting a camera to be aligned with a fusion band area, fixing the posture to remain stable, and connecting the camera to a computer; and setting a fusion band transverse sampling point number N, setting a fusion band curve sampling point initial value to enable the fusion band brightness change to be linear change, projecting a synthesis image including a fusion band positioning picture and a white picture background and a fusion picture, acquiring a projection image picture by the camera through opencv, recognizing fusion band locating point area coordinates, recognizing a locating fusion band area, finding a fusion band transverse center line, dividing the center line into N equal parts, obtaining the difference between the brightness of each equal-dividing point and the brightness of the start point of the center line, calculating a fusion band control point correction value by employing a progressive bisection method, updating a projection fusion image, repeating the above steps until all control point differences are less than a specific difference threshold, and ending color adjustment of the fusion band. According to the method, the fusion picture is corrected by employing the progressive bisection correction method to achieve color balance, automatic processing is realized without artificial intervention, the obtaining of equipment is easy, and the effect is good.

The invention discloses a pulse width modulation (PMW) modulation circuit which specifically comprises a first transmission door, a first current comparer, a first alternative selector, a reset set (RS) trigger, two input nor gates, a phase inverter, a first N-channel metal oxide semiconductor (NMOS) tube, an error accumulation capacitor and a comparer with the selection function. The PMW modulator circuit can certainly modulate external input PWM signals according to current actually flowing through a light-emitting diode (LED), the duty ratio is adjusted, the duty ratio of the PWM signals actually participating in dimming in the circuit can be dynamically and correspondingly modulated as actual current change of the LED, and a signal driving switch of the LED is controlled to enable the luminance of the LED in all digital pulse periods to be equal to a preset value to improve PME dimming accuracy.

The invention discloses an LED display screen. The LED display screen includes: an LED light-emitting array, the LED light-emitting array includes a plurality of LED light-emitting chips; a matrix light-shielding frame, the matrix light-shielding frame includes a plurality of grids, and a plurality of the grids are connected to form a matrix, and the The grid is hollowed out, and the LED light-emitting chips are correspondingly arranged in the grid; the light-absorbing plate is used to absorb part of the outgoing light of the LED light-emitting chips, wherein the light-absorbing plate completely covers the grid LED light-emitting chips surrounded by lattice. According to the present invention, by adding a light-absorbing plate structure inside the display screen, the light emitted by the LED is all emitted through the light-absorbing plate, thereby effectively balancing the brightness of the three colors of R, G, and B at different viewing angles, and achieving the purpose of reducing chromatic aberration. Improved the visual effect of the LED display.

The embodiment of the present invention discloses an image display control method and device and a display screen control system. For example, it receives an input image, performs brightness component mapping processing on the target pixel data of the input image, and maps the brightness component to the target pixel after processing. The data is converted from the color separation color space to the primary color color space, the target pixel data converted to the primary color color space after the brightness component mapping processing is processed, and the filtered target pixel data is output to the display screen for image display. Therefore, the brightness and contrast of the displayed image can be effectively balanced, and the brightness of the image can be enhanced without losing the gray scale.

A backlight unit is prepared as setting a light source support zone on support base and at least two point light sources on light source support zone, setting diffusion plate above support base and two said point light sources, making positions of two said point light sources be different along thickness direction of backlight unit or making optical axis pointing directions of emitting light be different for raising optical performance of backlight unit.

A Liquid crystal display device comprises a backlight module and a control unit, wherein the control unit is used for controlling the backlight module to regulate the opening time and the light intensity of a backlight light source in terms of the brightness difference between a left eye image and a right eye image, so as to balance the brightness of the left eye image and the right eye image and improve crosstalk disturbance. The liquid crystal display device regulates the opening time and the light intensity of the backlight light source in terms of the brightness difference between the left eye image and the right eye image, so as to balance the brightness of the left eye image and the right eye image and reduce crosstalk disturbance.