I. Related technical background (background technology)
1, briefly introduce the development of this technical field;
2. Explain the relevant key technologies;
Note: Don't provide anything that doesn't help to understand the invention.
Second, the existing embodiment similar to the present invention (prior art)
1. introduces the prior art related to the present invention.
2. Introduce the technical scheme of the prior art.
Note: Only relevant prior art is provided, and irrelevant ones are not provided. If the shortcomings or deficiencies of the prior art are the technical problems to be solved by the present invention, it is related prior art, otherwise it is irrelevant prior art; The implementation should be described in words and attached with drawings; It should be introduced in detail so that you can understand the technical content without looking at the literature. If the existing technology comes from patents, periodicals and books, provide the source.
3. Analyze the shortcomings of the existing technology
According to the advantages of the invention;
Problems that cannot be solved by the invention need not be provided;
The problems in the prior art can be similar problems, such as high cost, high error rate, slow response speed, etc. , but they are different according to the specific technical field. If many existing technologies are very relevant to the present invention, they can be described separately in a similar manner as described above.