Location coding detecting device

Abstract

The invention provides a location coding detecting device which comprises a location recognition pattern layer, a quarter-wave plate and a pen-type input device, wherein the location recognition pattern layer comprises a plurality of geometric patterns with coded locations so as to receive the light rays of the first wavelength and stimulate light rays different from the first wavelength in a light-induced mode; the quarter-wave plate is used for converting linearly polarized lights from an upper polarizer into circularly polarized lights, and the circularly polarized lights are provided with first polarization directions; an emitter of the pen-type input device is used for emitting light rays with the first wavelength; an image reading device of the pen-type input device reads images formed by emergent light rays of the location recognition pattern layer; and circularly polarized sheets are arranged between the location recognition pattern layer and the image reading device. Compared with the prior art, light rays emitted and received by the pen-type input device provided by the invention belong to different wave band ranges, thus the light glaring issue can be avoided; and additionally, the location recognition pattern layer form geometric patterns by adopting fluorescent powder or quantum dots, and the stimulated and emergent non-polarized lights and scattered lights in a light-induced mode can increase the image recognition accuracy.

Description

technical field [0001] The invention relates to the fields of semiconductor technology and liquid crystal display technology, in particular to a position code detection device for liquid crystal display equipment. Background technique [0002] In recent years, flat panel displays have received intense attention in the electronics industry. Flat panel displays are usually applied to display screens of notebook computers and personal computers, especially portable electronic products such as personal digital assistants (Personal Digital Assistance, PDA). Some of the flat panel displays are position-sensing liquid crystal displays, which can sense the position of the stylus when the stylus directly touches the display panel. [0003] for example, figure 1 A resistive touch position sensing liquid crystal display 10 is shown, which has a resistive touch panel 11 and a stylus 13 . like figure 1 The shown resistive touch position sensing type liquid crystal display 10 senses t...

AI Technical Summary

Problems solved by technology

At the same time, since the glass or optical film layer in the liquid crystal panel is a smooth surface, the light emitted by the stylus is likely to cause glare, and the recognition effect of the image receiving device is poor, and it is impossible to accurately determine the touch position information

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