Page Navigation Control for Fast-Forward Smoothness
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Solution Overview
Problem
Existing information processing devices, such as portable game machines and smartphones, lack operability when viewing content like electronic books, requiring improved methods for page navigation and viewing direction to mimic the experience of reading a physical book.
Innovation Solution
An information processing device with an operation receiving section for page changes and an image rendering section that updates the display by culled and unculled page management during fast-forward operations, and a scrolling processing section that scrolls the screen based on user contact operations on a touch pad, enhancing the natural reading experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If fast-forwarding operation requests page changes to be made consecutively in predetermined cycles, then page turning speed is improved, but display smoothness deteriorates due to processing delays
Solution Approach 1:
The system performs preliminary actions by generating and storing image data of future pages in advance before they are actually displayed. During fast-forwarding operations, this pre-generated image data allows pages to be displayed immediately without waiting for real-time processing, thereby maintaining display smoothness while achieving high page turning speed.
Solution Approach 2:
The patent segments the page turning process into distinct phases: image data generation, culling decisions, and display rendering. By separating these functions and managing them independently, the system can efficiently handle fast-forwarding operations by controlling which pages are culled and which are displayed, resolving the contradiction between speed and smoothness.
2Device complexity
If image data is generated for all pages in advance, then display smoothness is improved, but memory usage increases
Solution Approach 1:
Instead of uniformly generating image data for all pages, the system applies local quality by selectively generating and storing image data only for pages that are likely to be displayed soon. The culling mechanism determines which pages receive pre-generated image data based on predicted user behavior and fast-forwarding patterns, optimizing memory usage while maintaining display smoothness where needed.
Solution Approach 2:
The system dynamically changes the parameter of image data generation based on operational context. During normal browsing, minimal image data is cached. During fast-forwarding operations, the system switches to generating image data in advance for multiple pages. This parameter change allows the system to balance memory usage and display smoothness according to actual usage patterns.
3Measurement precision
If scrolling is performed only after contact is ended, then operation accuracy is improved, but responsiveness deteriorates
Solution Approach 1:
The system performs preliminary scrolling actions during the contact period before the contact is ended. While the user's finger is still on the touch pad, the system begins scrolling in the intended direction and by a predetermined amount. This preliminary action ensures that when contact is ended, the scrolling is already in progress or complete, providing both responsiveness and accuracy.
Solution Approach 2:
The scrolling operation is divided into periodic phases: a preliminary scrolling phase during contact, and a completion phase after contact ends. This periodic action allows the system to initiate scrolling early (improving responsiveness) while still maintaining the accuracy benefit of waiting for contact termination to determine the final scroll amount and direction.
Data Source
AI summary
When a user fast-forwards pages and there arises a necessity to display pages ahead of image data generating processing by a page image generating unit 114, a paging managing unit 112 of a viewing screen control section 110 culls pages whose image data is to be generated, and requests an image rendering unit 122 to display already generated preceding or succeeding pages as a dummy. A display region managing unit 116 requests the image rendering unit 122 to sequentially display specified display regions stored in a movement rule storage unit 118 according to advancing operation of the user. The advancing operation is started at a point in time that a finger in contact with a front touch pad 21 is removed. An advance notice operation of moving a display region by a minute amount in a direction in which a movement is intended to be performed is performed before the advancing operation.