Inductive display apparatus of signal pen

Abstract

The invention discloses an inductive display apparatus of a signal pen. The apparatus comprises two superposed layers; the first layer is a contact surface for writing or touch by the signal pen; thesecond layer is a circuit board layer on which a sensor array and a display array are alternately arranged in a mixed way and cannot be separated; the circuit board layer is formed by splicing at least one circuit board module in a building block way along the layer surface; each circuit board module comprises one or more minimum elements which are same or similar in circuit structure and are orderly arranged in an array; each element comprises but is not only limited to at least one sensor, a luminous body or a luminous body array, and an optional scheme matching feature circuit; and the sensors are close to the luminous bodies in physical position. By matching with the signal pen, the inductive display apparatus can be connected with a computer to form a touch screen system with a locating apparatus, and also can form a locating-free pure hardware type electronic blackboard; and the inductive display apparatus has the characteristics of multicolor pen writing and blackboard eraser induction.

Description

technical field [0001] The invention relates to an inductive display device including a touch display screen, in particular to an inductive display device for a signal pen. Background technique [0002] There are many types of existing touch display screens, which adopt different types of positioning technologies (that is, technologies for detecting coordinates of contacts or sensing points), including capacitive, resistive, inductive coil, surface acoustic wave, and infrared scanning. type, or infrared camera type, etc. One of their common features is that a touch-sensing input device (that is, a positioning device) is added on the transparent surface of the display screen or around the outside. Therefore, the display device and the positioning device are two independent parts that can be separated, and the removal of the positioning device does not affect the display. The device works. This determines that the imaging display device (such as a liquid crystal panel, proje...

AI Technical Summary

Problems solved by technology

This determines that the imaging display device (such as a liquid crystal panel, projection screen, etc.) and the positioning device are independent modules of two coordinate systems, so there are several obvious defects: 1. The positioning accuracy is low, due to the sensor dot matrix distribution density , detection accuracy or algorithm accuracy, etc., usually the collection density (resolution) of positioning coordinate information is less than or far less than the pixel resolution of the display dot matrix. For example, in the example, the pixel dot matrix resolution of an LCD display is 1920x1080. The infrared scanning positioning resolution is only 128x72 or slightly higher, limited by its manufacturing technology, the positioning coordinates and pixel coordinates cannot achieve one-to-one correspondence; 2. Dislocation, the positioning device is attached to the display device, and the positioning coordinate system and pixel coordinates often appear In addition, nonlinear distortion of positioning coordinates occurs especially at the corners of the screen, usually pincushion distortion or barrel distortion, which leads to misalignment between the handwriting display position and the actual handwriting position, and often requires algorithm correction; for example, a For capacitive screens, its positioning coordinates are calculated by detecting the current from the touch point to the four vertices of the screen rectangle, and its coordinate system is a typical pincushion deformation, which needs to be corrected linearly; Due to the failure of the camera at a very short distance, etc., it is easy to have a touch recognition blind spot at the corner of the screen; 4. Due to the mutual occlusion between the touch points in the horizontal or vertical direction, it is difficult to distinguish them, and it is difficult to truly realize multi-touch; 5. Some positioning technologies, no matter touch the screen with hands, pens, sleeves or other objects, will be recognized as valid signals, so it is easy to misuse; 6. Capacitance, inductance, surface acoustic wave, infrared and other methods are easily affected by external interference Signal influence; 7. The positioning information usually needs to be transmitted to a computer or microprocessor to calculate and image the coordinates and movement information, and then display it through the display dot matrix or display screen, so there is a certain time delay in the display, especially when drawing lines quickly , the handwriting display cannot keep up with the movement speed of the brush; 8. All kinds of touch screens have size limits. On the one hand, there are product size restrictions due to the manufacturing process; This leads to the attenuation of the detection signal, the reduction of the signal-to-noise ratio, and the insensitivity phenomenon until it cannot work.

There is no mature solution for large-size positioning technology. There are patchwork large-size touch handwriting methods on the market. For example, several touch-screen LCD TVs are placed together to form a large screen, but the touch-screen TVs are independent of each other and can be operated in partitions. The physical frame of the respective positioning device separates the whole

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