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Multiple light sensors and algorithms for luminance control of mobile display devices

A light sensor, display technology, applied in the field of lighting systems, which can solve the problems of different, difficult to view displays, wrong readings of ambient light intensity, etc.

Inactive Publication Date: 2009-08-12
MOTOROLA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such systems do not take into account the fact that the overall ambient light intensity may be significantly different from the intensity detected in the direction the sensor is pointing
So if the sun is behind the user and the light sensor is pointing towards a shaded area, the control circuitry will set the backlight illumination intensity to its lowest value, and the ambient light from the sun will make it difficult to view the display
Also, the sensor may become blocked by the user's hand, thereby giving a false reading of the ambient light intensity

Method used

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  • Multiple light sensors and algorithms for luminance control of mobile display devices
  • Multiple light sensors and algorithms for luminance control of mobile display devices
  • Multiple light sensors and algorithms for luminance control of mobile display devices

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Embodiment Construction

[0019] Preferred embodiments of the present invention will now be described in detail. Referring to the drawings, like numerals indicate like parts throughout. The following terms used in this specification and throughout the claims take the meanings expressly associated therewith unless the context clearly dictates otherwise: the meanings of "a" and "the" include plural references, "wherein" The meaning of includes "in" and "on".

[0020] Such as figure 1 As shown in , factors that affect the perceptibility of display 10 include: the intensity and direction of light from the sun 14, the diffuse properties of the atmosphere 12, the passing overhead of clouds 16, shadows from trees 18, and shadows and reflections from buildings 20 . From figure 1 It can be seen that the ambient light intensity cannot always be accurately measured by sensing in one direction relative to the display. Therefore, if figure 2 As shown in , one embodiment of a device 10 using a display 102 ill...

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Abstract

In a method of controlling a lighting unit of a display, a maximum value of ambient light intensity is determined (156). Ambient light intensity is sensed (154) from a first direction relative to the display and from a second direction, different from the first direction, relative to the display. The lighting unit is driven so that light from the lighting unit has a low intensity (172) when the maximum value is less than a first intensity threshold and so that light from the lighting unit has a high intensity, greater than the low intensity, when the maximum value is greater than a second intensity threshold.

Description

technical field [0001] The present invention relates to lighting systems for displays, and in particular to lighting systems that compensate for ambient brightness. Background technique [0002] Liquid crystal displays (LCDs) are a widely used technology in providing user interfaces to many digital devices, such as cellular telephones and personal data assistants. LCDs generally consist of a layer of liquid crystal sandwiched between two layers of glass, one or two polarizing filters (depending on the type of liquid crystal used) and an array of thin-film electrodes. [0003] The LCD itself does not generate light, but merely modifies the light passing through the LCD to obtain the display result. While some LCD applications, such as digital watches, rely on ambient light to interact with the LCD, many LCDs require a backlight to illuminate the display. Often, the backlighting consists of a row of light emitting diodes (LEDs) at the base of the display and a plate behind t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/34
CPCG09G2320/064G09G3/3406G09G2360/144H05B45/10
Inventor 杨森罗伯特·埃金斯大卫·埃米格约翰·克勒庄志明
Owner MOTOROLA INC