Backlight control system for small size display, LCD panel therefor, and method for making backlight control system
AssigneeAvago Technologies ECBU IP (Singapore) Pte. Ltd.
InventorMasatoshi Yamai
Life of this patent
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Abstract
A backlight control system has a light source controlled by a control device; a light guide for introducing light from light source and supplying backlight from the back surface of liquid crystal panel; a light sensor for detecting part of the backlight; and means for feeding signals from light sensor back to control device. Liquid crystal panel comprises light sensor on the side of the glass substrate thereof opposite the side where drive elements are mounted. Light sensor detects light from the base side that has passed through glass substrate on the surface of glass substrate.
Claims8
A backlight control system comprising:
- a liquid crystal panel comprising a top panel attached to a base panel;
- said top panel comprising a top panel first surface, an oppositely disposed top panel second surface and a liquid crystal display surface visible from said top panel first surface;
- said base panel comprising a base panel first surface and an oppositely disposed base panel second surface;
- wherein said top panel second surface is adjacent said base panel first surface;
- a light source having a light-emitting device for emitting light of multiple, different wavelengths that is controlled by a control device;
- a light guide adapted to receive light from the light source and supply backlight through the base panel second surface of the liquid crystal panel;
- a light sensor adapted to sense light emitted from said light source and feed signals to the control device;
- drive elements adapted to drive the liquid crystal panel;
- wherein, said light sensor and said drive elements are mounted on said base panel first surface sandwiching said top panel therebetween;
- and
- a light-blocking mask formed on the base surface of the glass substrate opposite the position where the light sensor is mounted and a window through which some of the backlight is capable of passing is formed on the interior side of the light-blocking mask.
A liquid crystal panel formed by joining glass substrates together, said liquid crystal panel is constructed such that IC chips that serve as drive circuits are formed along one side of the top surface of the glass substrate on the base side and a light sensor capable of sensing each wavelength of light of multiple, different wavelengths is mounted along the other side sandwiching the liquid crystal display surface such that the light sensor is capable of sensing light that has been introduced from the back surface through the glass substrate surface.
A method for producing a backlight control system comprising:
- producing a liquid crystal panel, which comprises a process for mounting the drive circuits for driving the liquid crystals on a glass substrate;
- disposing a light guide for supplying backlight on the back surface of the liquid crystal panel;
- optically joining the light source with the light guide;
- disposing the light sensor for detecting some of the light that serves as the background light near the light guide and feeding detection signals of the light sensor back to the control circuit of the light source, said step for disposing the light sensor comprises a process for mounting the light sensor on the glass substrate of the liquid crystal display panel;
- and
- wherein said step for producing a liquid crystal panel further comprises a process for forming a light-blocking mask on the back surface of the glass substrate opposite the surface on which the light sensor is mounted and forming a window through which some of the light is introduced to the interior side of the light-blocking mask.
Dependencies are inferred from the claim text.