METHOD AND DEVICE FOR CHARACTER INPUT BY DIECTION KEY

• US 20120235838A1
• Filed: 12/17/2009
• Published: 09/20/2012
• Est. Priority Date: 11/25/2009
• Status: Active Grant

• Current Assignee: Foxit Corporation
• Original Assignee: Foxit Corporation
• Inventors: XIong, Yuqian, Wang, Hang
• Granted Patent: US 9,524,035 B2
• Time in Patent Office: Days
• US Class Current: 341/22
• CPC Class Codes: G06F 3/0234 using switches operable in different directions

Abstract

A method and a device for character input by direction key are disclosed. The method comprises: a mapping relation between characters in input character set and direction key input sequences is constructed, and at least a code table representing the mapping relation is established; the character is inputted by a code table selection key and a direction key, the character input comprises the following steps: a code table as a current code table is determined according to the input of a code table selection key (S10); a prompting message of the current code table is displayed on a display screen (S20); an input character is determined in the current code table according to a direction key input sequence (S30). The used direction key, the confirmation key and the code table selection key are based on an existing key of an existing e-book reader, media player and other electronic devices.

Claims

1. A method for character input by arrow keys characterized in that a mapping relationship between characters in an input character set and the sequence of arrow keys input is constructed, and at least one code table is established to indicate said mapping relationship;

a character is input by code table selection keys and arrow keys, which comprises the following steps;

S10;

to determine the current code table according to the input of the code table selection keys;

S20;

to display the prompt message of the current code table on the display screen;

S30;

to determine the character input in the current code table according to the sequence of arrow keys input.

2. The method as claimed in claim 1 characterized in that the step S30 to determine the character input further comprises the following steps:

S31 to select a current character in the current code table according to the sequence of arrow keys input;

S35;

to judge whether the selecting condition is satisfied;

If yes, go forward to the step of S39;

if no, go back to the step of S31;

S39;

to confirm the current character as the character input.

3. The method as claimed in claim 2 characterized in that the selecting condition is that the sequence of arrow keys input is saturated;

wherein the “

saturated”

means that the sequence of arrow keys input already reaches the given length and the sequence of arrow keys input has a corresponding character in the current code table.

4. The method as claimed in claim 2 characterized in that the method further comprises using a confirmation key and taking pressing the confirmation key down as a selecting condition in the step of S35.

5. The method as claimed in claim 1 characterized in that t the number of the arrow keys is 4.

6. The method as claimed in claim 5 characterized in that t the maximum length of the sequence of arrow keys input is 3.

7. The method as claimed in claim 1 characterized in that the mapping relationship between the characters in the input character set and the sequence of arrow keys input is:

the characters in the input character set are distributed over every code table;

that every character in every code table is assigned a different code value C;

that for every code table, different sequences of arrow keys input correspond to different code values C.

8. The method as claimed in claim 7 characterized in that the corresponding relationship between the sequence of arrow keys input and the code value C in every code table is:

if the i-th arrow key is assigned a key-value Si, the row vector S that consist of key values of the keys in the sequence of arrow keys input will has a linear relationship with the code value C;

C=S×

B^T, and B is the coefficient vector of the corresponding dimension.

9. A method for character input by arrow keys characterized in that a mapping relationship between characters in an input character set and the sequence of arrow keys input is constructed, and at least one code table is established to indicate said mapping relationship;

a characters is input by code table selection keys, arrow keys and a confirmation key, the method for character input comprises the following steps;

P10) to detect whether there is any new key input;

if no, keep on waiting;

if yes, go to the next step;

P20) to judge the type of the key input and execute the following operations respectively according to the type;

when code table selection keys are input, to switch the current code table according to the key input and control the display screen to display the prompt message of the current code table, then go back to the step of P10;

when a arrow key is input, to recognize the key-value of the arrow key input and update the sequence of arrow keys input accordingly;

to select a current character in the current code table according to the sequence of arrow keys input and then go back to the step of P10;

when the Confirmation key is input, to confirm that the current character is the character input and go to the end of the process to input a character;

10. The method as claimed in claim 9 characterized in that in the step of P20;

when a arrow key is input, the method further comprises the step to judge whether the sequence of arrow keys input is saturated after updating the sequence of arrow keys input and determining the current character;

if no, go back to P10;

if yes, to confirm that the current character is the character input and finish inputting one character;

wherein, the “

saturated”

means that the sequence of arrow keys input reaches the given length and the sequence of arrow keys input has a corresponding character in the current code table.

11. The method as claimed in claim 9 characterized in that the number of the arrow keys is 4.

12. The method as claimed in claim 11 characterized in that the sequence of arrow keys input has at most 3 elements.

13. The method as claimed in claim 9 characterized in that the mapping relationship between the characters in the input character set and the sequence of arrow keys input is that:

the characters in the input character set is distributed over every code table;

that every character in every code table is assigned a different code value C;

that for every code table, different sequence of arrow keys input is mapped with a different code value C.

14. The method as claimed in claim 13 characterized in that the corresponding relationship between the sequence of arrow keys input and the code value C in every code table is:

if the i-th arrow key is assigned a key-value Si, the row vector S that consist of key-values of the keys in the sequence of arrow keys input has a linear relationship with the code value C;

C=S×

B^T wherein B is the coefficient vector of the corresponding dimension.

15. The method as claimed in claim 9 characterized in that the number of the arrow keys is 4.

16. The method as claimed in claim 15 characterized in that the length of the sequence of arrow keys input is 3.

17. A device for character input by arrow keys comprises a character input module and a group of keys input, a display screen and a memory that communicate with the character input module, characterized in that:

the group of keys input comprises at least one code table selection key, a plurality of arrow keys and at least one confirmation key;

the content to control the display screen and the character input module to execute the following steps is stored in the memory;

S10;

to confirm the current code table according to the input of the code table selection key;

S20;

to display the prompt message of the current code table on the display screen;

S30;

to confirm the character input in the current code table according to the sequence of arrow keys input.

18. The device for character input by arrow keys as claimed in claim 17 characterized in that a mapping relationship between characters in an input character set and the sequence of arrow keys input and at least one code table to indicate said mapping relationship are stored in the memory, and the character input module comprises:

a key recognition unit used to receive the key input and recognize Which key is pressed;

an input judgment unit to judge the type of the key input;

an analysis processing unit to execute the corresponding operation according to the type of the key input;

wherein, when a code table selection key is input, the current code table is switched according to the key input and the prompt message of the current code table is sent to a display control unit;

when a arrow key is input, the key-value of the arrow key input is recognized, the sequence of arrow keys input is hereby updated and a current character is determined in the current code table according to the sequence of arrow keys input;

when a confirmation key is input, it is confirmed that the current character is the character input, and the character input is sent to a character input temporary memory unit;

the display control unit used to control the display screen to display correspondingly according to the received message;

the character input temporary memory unit used to store the confirmed character input.