32results about How to "Adjust contrast" patented technology

An electronic price scale having a TFT type of LCD as a display comprises a contrast adjustment function which adjusts a contrast of the LCD.

The invention discloses an image projection display method and an optical engine. The method comprises the steps of obtaining image data of a to-be-projected display image; partitioning the to-be-projected display image according to luminance data, wherein the partitions have different luminance levels; adjusting luminous flux of an area, in a luminous flux control element, corresponding to each partition in the to-be-projected display image according to the luminance level corresponding to each partition; projecting an adjusted light beam to a surface of a DMD (Digital Micromirror Device) light valve by the luminous flux control element; and modulating the light beam and projecting the light beam into a projection lens for imaging display by the DMD light valve according to an image display drive signal of the to-be-projected display image. According to the image projection display method, the luminance distribution of a projection display image can be automatically controlled according to the luminance level of each partition of the to-be-projected display image, thereby adjusting contrast of the projection display image. The invention also provides an optical engine.

The invention discloses a display panel and a display device. The display panel comprises a first substrate, at least one reflection structure, a signal line and a control circuit, wherein at least one reflection structure is arranged on the first substrate and comprises a reflection layer and an electrochromic layer arranged on the reflection layer; the signal line is arranged on the first substrate; at least one part of the projection of at least one reflection structure on the first substrate along a direction vertical to the first substrate and at least one part of the projection of the signal line on the first substrate along a direction vertical to the first substrate are overlapped; the control circuit is arranged on the first substrate; and the control circuit is connected with theelectrochromic layer. By use of the display panel, the use ratio of a backlight light source is improved, and a display effect is improved.

The invention provides a liquid crystal display brightness control method and device and a liquid crystal display device, which belong to the technical field of liquid crystal display, wherein, according to the received image signal, the gray scale value of the image in the partitioned image data block is determined according to the preset rules, and the gray scale value of the image is determined according to the gray scale of the image Pre-extract the partition backlight value corresponding to the partition image data; multiply the preset backlight value gain coefficient with the pre-extracted partition backlight value to obtain the partition backlight value after the gain of the backlight partition, wherein the preset backlight value gain coefficient greater than 1; map the backlight value of each partition after gain to the driving circuit of the backlight in the corresponding backlight partition to drive and control the brightness of the backlight of the corresponding backlight partition; improve the contrast and image quality effect of the liquid crystal display screen.

The invention provides a liquid crystal display brightness control method and device and a liquid crystal display device, which belong to the technical field of liquid crystal display, wherein, according to the received image signal, the gray scale value of the image in the partitioned image data block is determined according to the preset rules, and the gray scale value of the image is determined according to the gray scale of the image Pre-extract the partition backlight value corresponding to the partition image data; multiply the preset backlight value gain variable with the pre-extracted partition backlight value to obtain the partition backlight value after the gain of the backlight partition, wherein the preset backlight value gain variable greater than 1; map the backlight value of each partition after gain to the driving circuit of the backlight in the corresponding backlight partition to drive and control the brightness of the backlight of the corresponding backlight partition; improve the contrast and image quality effect of the liquid crystal display screen.

A retardation compensation plate having a birefringent property for compensating residual retardation of a liquid crystal panel includes: a combined unit formed of an optical multi-layered film composed of a plurality of layers having different refractive indices stacked in a regular order and a polymer film. In the retardation compensation plate, the retardation compensation plate and the liquid crystal panel have in-plane retardations that satisfy the relationship: 1<R0c / R0p≦̸10, where R0c is an in-plane retardation of the retardation compensation plate and R0p is an in-plane retardation of the liquid crystal panel.

The invention discloses a self-adapted image enhancement method based on a related coefficient. In the method, firstly, three low pass filter processes are performed on an original image to obtain three layers of low frequency image, and three layers of high frequency image are obtained by performing vector subtraction operation on adjacent layers of the low frequency image; secondly, relative coefficient of each layer is calculated by performing division on points of adjacent layers of the high frequency image, details and noises are separated and enhanced or inhibited via the related coefficient, and vector addition operations are performed on processed high frequency image of each layer and the third low frequency image to obtain detail-sharpened such as edge-sharpened image; and finally, visual behave optimized theory is applied on the method to perform contrast self-adapted enhanced process on the sharpened image so as to obtain enhanced desired image. The invention can separate noises and details and can self-adapt process images on various weather conditions, and the enhanced image has good texture, edge details and desired contrast.

The invention discloses a method for improving a displaying effect of a display screen and a terminal device thereof. The terminal device comprises an optical sensor, a main chip and a photoreceptive integrated circuit (IC). The method includes the following steps: a, a plurality of groups of display screen gamma values are set, and each group of gamma values correspond to light intensity of one ambient light range; b, The optical sensor senses ambient light, obtains light intensity, and sends the light intensity to the photoreceptive IC; c, the photoreceptive IC analyzes the ambient light intensity, obtains a tone value, a brightness value and a saturation value of the ambient light, and sends the tone value, the brightness value and the saturation value of the ambient light to the main chip; and d, the main chip calls a preset display screen gamma value according to the ambient light and sends the gamma value to the display screen, and the display screen adjusts contrast ratio. Under different ambient lights, corresponding display screen gamma values are set to adjust the contrast ratio of display screen, and the purpose of improvement of the displaying effect of the display screen is achieved.

The embodiment of the present invention discloses a method for digitizing historical aerial photographs, which relates to the field of site selection and construction of airport navigation stations, urban planning, sunshine analysis, terrain analysis, public safety, and photography technology, and is used to solve the digitization of historical aerial photographs in the prior art Problems that must be done by scanning and work efficiency is low. The digitization method of the historical aerial photographs includes: taking the historical aerial photographs of the target with a digital camera; wherein, the pixels of the digital camera are not less than 100 million; after post-processing the original image output by the camera, the resolution is obtained. The output images not lower than 23μ are digitally saved. The present invention uses a high-resolution large area array digital camera to shoot images of historical aerial photographs, combined with computer post-processing, can quickly digitize aerial photographic data, no longer needs to scan historical aerial photographs, and improves the efficiency of digitizing historical aerial photographs .