Backlight control system for small size display, LCD panel therefor, and method for making backlight control system
AssigneeAvago Technologies General IP (Singapore) Pte. Ltd.
InventorMasatoshi Yamai
Life of this patent
Estimating the term…
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.
Claims10
A backlight control system comprising:
- 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 for receiving light from the light source and supplying backlight from the back surface of the liquid crystal panel,
- a light sensor for sensing the components of the backlight of multiple, different wavelengths, and
- a means for feeding the signals of the light sensor back to the control device,
- wherein said light sensor is mounted, together with drive elements that drive the liquid crystal panel, on the top surface of the glass substrate on the base side that forms the liquid crystal panel in a position where it is inverted, sandwiching the liquid crystal display surface with the end where the drive elements are mounted such that the sensor senses the light that penetrates from the back surface of the glass substrate and passes through the glass substrate.
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;
- and
- 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.
Dependencies are inferred from the claim text.