Interactive projection system and touch control interactive method thereof

Abstract

The invention provides an interactive projection system, which includes a projection module for projecting a projection picture, a projection screen for displaying the projection picture, a light curtain projection module for projecting a light curtain between the projection module and the projection screen, a touch control sensing module coupled with projection screen for sensing whether the projection screen is touched, and a light sensing module for sensing whether a shielding spot exists on the light curtain and further obtaining corresponding coordinate positions of the shielding spot on the projection picture. When the projection screen is touched, the touch control sensing module sends a first trigger signal to the light curtain projection module to enable the light curtain projection module to project the light curtain; when the light sensing module senses that the touch position on the projection screen corresponds to the shielding spot on the light curtain, the light sensing module sends out a second trigger signal to the projection module to enable the projection module to execute touch control operation corresponding to the coordinate positions on the projection picture; and moreover, when the projection screen is not touched, the light curtain is not formed. With adoption of the interactive projection system, the influence on the touch control sensitivity of the whole system by the distance from the light curtain to the projection screen is effectively reduced.

Description

technical field [0001] The invention relates to the field of projection, in particular to an interactive projection system and an interactive method operated in a touch mode. Background technique [0002] With the continuous development of the projector industry and the continuous upgrading of products, more and more projection systems have interactive functions, that is, through some operations on the projection screen to complete the interface operations that originally needed to be completed by a computer, so that Projection operation is more convenient. At present, in the field of touch interactive projection systems, there are generally two system architectures, one is a projection system that uses a stylus to achieve interactive actions; the other is a touch projection system that does not rely on a stylus . For example, as shown in FIG. 1 , it is a structural diagram of an interactive projection system in the prior art. The projection system can realize the touch fu...

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Problems solved by technology

[0003] However, such a structure has extremely high requirements on the flatness of the projection screen 2 and the parallelism between the light curtain 5 and the projection screen 2

Of course, in order to ensure that the finger 6 can be accurately detected when touching the projection screen 2, the distance between the light curtain 5 and the projection screen 2 should be as small as possible, because if the distance between the light curtain 5 and the projection screen 2 is too large If this is the case, before the user's finger 6 touches the projection screen 2, the light sensing element 4 may detect the reflection of the light at the touch position on the light curtain 5 and misjudgment may occur.

In addition, in order to make the light curtain 5 closer to the projection screen 2, in addition to the precise parallelism between the light curtain 5 and the projection screen 2, the flatness of the projection screen 2 must be as small as possible. , since the flatness of the projection screen is limited by its manufacturing process and materials, the smaller the flatness will inevitably lead to an increase in its manufacturing cost

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