77results about How to "Brightness control" patented technology

Disclosed is a method for determining environmental brightness to appropriately control display brightness according to variations of the environmental brightness in different places in a mobile communication terminal including a camera having an automatic gain control (AGC) function, and a method for controlling the display brightness using the same, including the steps of calculating a luminance average of a center region of a photographed screen corresponding to an AGC reference region and a luminance average of an edge region except for the center region as brightness values from an image signal generated by photographing of the camera, comparing the brightness value of the edge region with a previously-set dark environmental critical value, comparing the brightness value of the center region with the brightness value of the edge region according to the comparison result, and determining that the environmental brightness is one of the bright state and the dark state, calculating a histogram of the luminance elements, and performing brightness contrast stretching, controlling the display brightness by adding or subtracting a previously-set control value to / from the brightness contrast stretched pixels according to environmental brightness determined by the method for determining the environmental brightness, and replacing the brightness-controlled luminance elements by the luminance elements of the image signal which will be transmitted to the display.

The invention discloses a terminal screen brightness adjusting method and system. When a terminal is awaken, an environment light brightness value is obtained; a first screen display brightness value corresponding to the environment light brightness value is set as a screen display brightness value; the working state of the camera of the terminal is monitored; when the terminal starts the camera, the exposure of the camera is obtained; a second screen display brightness value corresponding to the exposure is searched; the first screen display brightness value and the second screen display brightness value are compared; and when the second screen display brightness value is more than the first screen display brightness value, the second screen display brightness value is set as the screen display brightness value. According to the method and the system of the invention, when the target environment or the object of the camera is relatively dark and the display effect of an optical sensor cannot be brightened in the dark condition, the brightness of the display is controlled through the automatic exposure system of the camera; the presentation details of pictures on the display are increased; and convenience is brought to a user.

The invention discloses a brightness control method of an optical image detector, which is used for detecting an incident optical image when the light of a light source reflects an object, and controls the brightness of the light source according to the detected incident optical image. The optical image detector detects the light through an image sensor or an electric shutter, and an image processor or a system controller directly adjusts the brightness of the light source according to the detected incident optical image. According to the brightness control method of the optical image detector of the present invention, the image quality of the object can be improved by removing the image noise and residual image caused by insufficient brightness of the light source, and the consumption of power supply can be reduced by directly adjusting the brightness of the light source.

A radiation detector is disclosed, for the detection of radiation (8), with a given spectral sensitivity distribution (9), which has a maximum at a given wavelength lambdao, comprising a semiconductor body (1) with an active region (5), provided for detector signal generation and for the incident radiation. In one embodiment, the active region (5) comprises a number of functional layers (4a, 4b, 4c, 4d), with differing band gaps and / or thicknesses and embodied such that said layers (4a, 4b, 4c, 4d) at least partly absorb radiation at a wavelength greater than lambdao. In a further embodiment, a filter layer structure (70) is arranged after the active region, comprising at least one filter layer (7, 7a, 7b, 7c). The filter layer structure determines the short wave side (101) of the detector sensitivity (10), according to the given spectral sensitivity distribution (9), by means of absorption of wavelengths less than lambdao. A radiation detector for the detection of radiation (8), according to the spectral sensitivity distribution (9) of the human eye is also disclosed. The semiconductor body can be monolithically integrated.