93results about How to "Guaranteed Contrast" patented technology

The invention discloses a method for eliminating dynamic streaking of liquid crystal display. The concrete steps include: (a). convert images of two following frames into black and white brightness signal images; (b). compare the pixels at the corresponding position in the black and white brightness signal images and retain the pixel with a smaller grayness value; (c). form a frame of black frame insertion images (Gn) with the group of pixels obtained after the comparison of each pair of pixels; (d). insert the black frame insertion images (Gn) into images of two following frames. The method of the invention is to compare continuous image signals of two frames, and form a frame of 'new grayness distribution signal' with the darker pixels of each pixel position as the black frame insertion image to reach the purpose of lowering MPRT and eliminating streaking of dynamic images. The invention can not only overcome the shortcoming of the low efficiency of the black frame insertion technique, but also overcome the inadequate elimination of dynamic blurs and the high decline of the contrast in gray frame insertion technique. In addition, the method of obtaining insertion frames is simple and accessible, thus greatly saving the production cost.

The invention discloses a display substrate and a preparation method thereof, a display panel and a display device. The display substrate comprises a plurality of display areas arranged in an array and non-display areas located between the display areas, wherein a display structure is arranged in each display area and is used for displaying a picture; and the non-display areas are transparent, and photochromic graphics are arranged in the non-display areas and are used for adjusting the light transmittance of the non-display areas according to the illumination intensity of the received light. According to the display substrate, the photochromic graphics are arranged in the non-display areas and can adjust the light transmittance of the non-display areas according to the illumination intensity of the received light, so that the brightness of the area for displaying a relatively dark image originally on the displayed picture is not improved due to the influence of external ambient light in a high-brightness external environment, thereby effectively ensuring the contrast of the displayed picture and improving the display quality.

The invention is fit for the technical field of LED (Light Emitting Diode) display and provides an LED display screen free from moire. The LED display screen free from moire comprises an LED lamp panel and a light diffusion structure, wherein a plurality of LED lamp beads distributed in an array are arranged on the LED lamp panel; the light diffusion structure is arranged on a light-emitting side of the LED lamp panel; the light diffusion structure comprises frames in an array form; the space is divided into a plurality of subspaces by the frames; a light diffusion medium is arranged in each subspace; the width of the top, far away from the LED lamp panel, of each frame is less than 0.3mm. According to the invention, the light diffusion structure is arranged on the light-emitting side of the LED lamp panel; the light emitted from the LED lamp beads forms a uniform area light source by passing through the light diffusion medium; the width of the top of each frame is extremely narrow, so that the periodicity of the pixel structure is weakened; when a CCD (Charge Coupled Device) or CMOS (Complementary Metal-Oxide-Semiconductor Transistor) array camera is used for shooting the LED display screen, no moire is generated; since each LED lamp bead corresponds to each subspace and different LED lamp beads are free from optical crosstalk, so that the contrast ratio of a picture is ensured.

The embodiment of the invention discloses a character stacking method a device thereof, including: obtaining a video image block required stacking the first character; obtaining the first character; obtaining the brightness mean value of the video image block; adjusting the brightness value of the foreground color pixel point of the first character according to the brightness mean value, to obtain the second character, wherein the relative value of the brightness value of the foreground color pixel point of the second character and the brightness mean value is larger than or equal to the first presupposed value; stacking the foreground color pixel point of the second character according to the brightness value and the corresponding pixel point in the video image block. Through adjusting the brightness value of the foreground color character to be stacked, that the difference is present between the brightness value of the foreground color of the character to be stacked and the brightness mean value of the video image block is ensured, to real-time ensure the contrast between the stacked character and the video image, thereby clearly displaying the stacked character.

The invention provides a holographic grating exposure method adopting heterodyne interference fringe locking control, belonging to the field of spectrum techniques. The existing holographic grating exposure method realized by adopting a linear array CCD (Charge Coupled Device) in the prior art has the problem that high-frequency fringe jitter inhibition effect is poor due to a reason that the response speed of the linear array CCD is slow. A set of holographic grating exposure device and a set of heterodyne interference fringe locking control device are equipped. Interference fringes are locked in real time and are placed on a grating substrate for exposure. The method provided by the invention has the advantages that the interference fringes can be locked at a certain fixed value relative to the phase of the grating substrate during exposure of a holographic grating; since the control bandwidth is larger, the high-frequency fringe jitter can be better inhibited, the contrast of the groove profile of the holographic grating is guaranteed and the manufacturing process level of the holographic grating is improved.

The invention provides a method for debugging the driving waveform of a three-color electronic paper module, and the method herein has the characteristics of excellent universality, and excellent comparison and display effects. The method is characterized in that the method includes the following steps: 1. determining master driving frames: driving the three-color electronic paper module by usingblack/white/red picture standard test waveforms, and separately reading the black, white and red optical values of a test picture under three kinds of standard test waveforms by using an optical tester, separately comparing the black, white and red optical values with a standard black L*value, a standard white L* value, and a standard red L* value and a* value, obtaining a standard test waveform that meets optical requirements and obtaining a black/white/red master driving frame of the three-color electronic paper module; 2. determining DC balance frames: separately based on the black master driving frame, the white master driving frame and the red master driving frame, determining the DC balance frames corresponding to the black master driving frame, the white master driving frame and thered master driving frame; and 3. determining driving waveforms which include the DC balance frames that perform first driving and the black master driving frame, the white master driving frame and the red master driving frame that perform follow-up driving.

The invention discloses an infrared and visible light image fusion method based on side window guided filtering, and belongs to the technical field of image processing. The method comprises the steps:carrying out the fuzzy processing of an input infrared and visible light source image through employing a Gaussian filter, and obtaining a large-scale base layer; subtracting the base layer image from the infrared and visible light source images to obtain a detail layer image containing small-scale information; calculating correlation coefficients of the infrared light source image and the visible light source image to obtain a fusion weight coefficient of the base layer, and fusing the base layer image; obtaining an initial detail layer weight graph by using a maximum absolute value rule, optimizing the initial detail layer weight graph by using side window guided filtering, and fusing detail layer images; and carrying out secondary fusion by using the fused base layer image and detail layer image to obtain a final fused image. According to the invention, the fusion of infrared and visible light images can be realized, and the fused image can maintain good contrast.

The method relates to a method for carrying out the global color calibration on a plurality of video cameras, belonging to the field of computer multimedia technologies. A calibrant is placed in the center of a scene, and N video cameras acquire an image from the calibrant in the center of the scene. The color calibration process comprises the following steps: calculating global correspondences ofall video cameras by applying a feature point detection method and relevant methods based on areas; establishing overdetermined linear equations based on the color consistency and the dynamic range constraint; and setting the obtained calibration parameters into all video cameras. The calibrant used in the method is simple, flexible and convenient for carrying; the color calibration process has simple algorithm routines, is easy to realize and fully automatic; and the color calibration merges the feature point detection method and the relevant methods based on areas together, thereby obtaining the high-precision global correspondences. The calibrant in the method and the color calibration method can be applied to any multi-video-camera array system, thereby achieving the color consistencyand the high-contrast calibration of all cameras.

The invention is suitable for the optical technology field and provides an optical imaging system and a target simulation system. The system comprises a polarization light splitting device, a miniature display module, a first polarized light source module and a second polarized light source module, wherein the polarization light splitting device is formed through gluing one pair of rectangular prisms, and a light splitting surface is formed at the bonding position of the rectangular prisms; the miniature display module is formed through splicing two same miniature displays; the first polarizedlight source module and the second polarized light source module are arranged on two adjacent equivalent focal planes of the polarization light splitting device; the P light of the first polarized light source module is vertically emitted into the polarization light splitting device and completely passes through the light splitting surface; the S light of the second polarized light source moduleis vertically emitted into the polarization light splitting device and is reflected at a 45 degree angle on the light splitting surface; the emitting directions of the S light and the P light form a 90 degree angle; and the P light and the S light finally generate an image in the miniature display module. In the invention, through an optical splicing technology, the resolution of the optical imaging system is increased, simultaneously, the size of the optical imaging system is reduced and weight is mitigated.