Touch Panel Character Input Layout for Small Display Screens

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Solution Overview

Problem

Existing character input methods for mobile devices, such as mobile phones and PDAs, face challenges in displaying and selecting multiple characters due to limited screen size, requiring multiple key presses and complex key structures, leading to increased manufacturing costs and operational complexity.

Innovation Solution

A display unit with character input boxes that display multiple characters in a grid, allowing characters to be selected by pushing a box, with adjacent characters displayed based on predefined relative positions, reducing the need for multiple key presses and simplifying the input process.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If multiple characters are displayed on the same touch panel, then character selection area is improved, but the area available for character display and selection is limited due to the nature of mobile electronic devices

Engineering Contradiction:

Improvecharacter display areaVSAvoiddevice structure

Core Design Contradiction:

Area of stationary objectVSDevice complexity

Solution Approach 1:

The patent combines the display function and touch sensor function into a single integrated touch panel. The touch panel simultaneously serves as both the display medium showing characters and the input sensor detecting user contact, eliminating the need for separate display and input components and thereby resolving the space constraint in mobile devices

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent utilizes the vertical dimension by allowing multiple characters to be displayed in a columnar arrangement on the touch panel. Users can select characters by moving their contact point vertically through the displayed characters, effectively using the vertical space to accommodate multiple character options without increasing the overall device footprint

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Productivity

If a common keyboard with character groups is used, then character input efficiency is improved, but the key structure becomes complex requiring multiple key presses

Engineering Contradiction:

Improvecharacter input efficiencyVSAvoidoperation simplicity

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The touch panel automatically displays relevant character groups based on the current input context or previously selected characters. When a user contacts the panel, the system automatically presents appropriate character options without requiring manual navigation through complex keyboard layouts, making the input process more intuitive and efficient

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The character display on the touch panel is dynamic rather than static. The displayed characters change based on user interaction history, selection state, and input context. This dynamic adaptation allows the same physical space to present different character sets at different times, improving input efficiency without requiring complex fixed keyboard structures

Inventive Principle:

Principle #15Dynamics

3Adaptability or versatility

If all kana characters are displayed on the touch panel, then character selection is improved, but the area on which many characters are displayed is limited

Engineering Contradiction:

Improvecharacter selection capabilityVSAvoiddisplay area

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The patent segments the character set into multiple groups (such as by column in the kana syllabary) and displays relevant segments on the touch panel based on current input needs. Rather than displaying all 46 kana characters simultaneously, the system presents characters in organized groups that can be navigated through vertical movement, making efficient use of the limited display area while maintaining comprehensive character selection capability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements a hierarchical character display structure where character groups are nested within the touch panel display area. Multiple character groups can be sequentially accessed through vertical navigation, with each group containing multiple individual characters. This nested arrangement allows comprehensive character selection capability within the limited physical space of the touch panel

Inventive Principle:

Principle #7Nested doll (Nesting)

Data Source

PatentUS12572271B2Information input device, information input method, information input control program, and electronic device

Publication Date: 2026.03.10 NEC CORP

AI summary

The present invention provides an information input device, in which information is inputted by easy operations, even if a display unit size is limited. An information input device of the present invention has: a display unit displaying a plurality of figures; a detecting unit arranged in front of the display unit or behind the display unit, and detecting whether a physical contact from an outside exists or not and a contacted position at which the physical contact exists; and a control unit deciding a figure displayed on the display unit and a position at which the figure is displayed, and inputting information based on a signal from the detecting unit, and when the detecting unit detects the physical contact exists, the control unit determines a first figure displayed at a nearest position to the contacted position in the plurality of figures based on the contacted position and decides a second figure displayed at a position surrounding the contacted position based on a kind of the first figure.