JPH0363720A - Input display device - Google Patents

Abstract

PURPOSE:To decrease the number of times of a scan per one scan cycle, to save the power consumption, and also, to improve the scanning efficiency and the operation convenience by scanning selectively only a line having necessity. CONSTITUTION:As for the signal line, ten pieces each exist in both the line direction and the row direction, and as for a touch key (b) provided by one piece each between these respective signal lines, total 100 pieces exist. In this state, a display control means (c) allocates and displays a character, etc., only to the touch key (b) corresponding to even lines and even rows by considering the operability of the touch key (b). In this case, even if the signal lines of odd lines and odd rows are brought to scanning, there is no workability, therefore, a scanning control means (d) outputs successively a scanning signal of, for instance, an 'H' level and executes scanning only to five pieces of signal lines of even lines or even rows related to the touch key (b) to which a character, etc., are allocated and displayed, without scanning all of ten pieces of signal lines of odd lines or odd rows. In such a way, only the line having necessity can be brought to scanning selectively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an input display device in which transparent touch keys for inputting characters and the like are provided on a display device such as a liquid crystal display panel.

[Prior Art] Transparent touch keys (key switches) are arranged on display panels such as LCD panels, EL panels, plasma display panels, and CRTs, and characters (symbols, functions, commands) are displayed on these touch keys. There is an input display device that allocates characters, etc., hereinafter referred to as characters, etc., and displays them at corresponding positions on the display panel, and inputs the characters, etc. that are allocated and displayed on the operated touch keys. It is used in personal computers, word processors, handheld terminals, bank CDs, etc.

As shown in FIG. 5, the touch key has a plurality of signal lines in the X direction (hereinafter referred to as X lines) a, b, C... and a plurality of signal lines in the Y direction (hereinafter referred to as Y lines). ■、■、
■--They are provided in an X-Y matrix between them.

Generally, key operations are recognized by sequentially setting all X lines a, b, c, etc. to "H" line by line, and sequentially leading Y lines ■, ■, ■, etc. In other words, when a touch key (key switch) is operated, the X line connected to that touch key and the X line are electrically connected, so for example, the touch key indicated by O in the figure When you operate , H on X line a
In response to “, only the Y line ■ becomes °゛H”, so ○
It can be seen that the touch key shown in is operated.

[Problem to be solved by the invention] In this case, as shown in FIG.
If characters etc. are assigned and displayed for all the touch keys related to..., then the X lines a, b, c...
・There was no problem even if I set all of them to "H" sequentially and scanned them. However, the display of character assignments (key layout) can be changed arbitrarily in the application, so -
For example, as shown in Fig. 3, there are cases where touch keys to which no characters are assigned and displayed appear, and in this case as well, conventionally all X lines a, b, c... H
”, which resulted in ineffective and wasteful scanning, which caused problems in terms of power consumption.

This is considered to be due to the fact that the line to be scanned is fixedly determined.

It is clear that power consumption can be saved if the lines to be scanned can be changed according to the display state of assignment of characters to touch keys and only necessary lines can be selectively scanned.

An object of this invention is to enable selective scanning of only necessary lines.

[Means to solve the problem] The means of this invention are as follows.

Display section a (see the functional block diagram in Figure 1; the same applies hereinafter)
These include liquid crystal display panels, EL panels, plasma display panels, CRTs, and the like.

The touch keys b are arranged in a matrix between a plurality of signal lines arranged in the row and column directions, are made of a transparent member, and are arranged on the display section a.

The display control means C arbitrarily assigns and displays characters and the like to the touch keys b.

The scanning control means d sequentially scans only the signal lines in the row or column direction related to the touch keys b to which characters or the like are assigned and displayed by the display control means C.

[Action Co. The operation of the means of this invention is as follows.

For example, there are 10 signal lines in both the row and column directions, and one touch key b is provided between each signal line.
It is assumed that there are a total of 100.

Then, in consideration of the operability of the touch key b, the display control means C selects a touch key b corresponding to an even numbered row and an even numbered column.
It is assumed that characters, etc. are assigned and displayed only for.

In this case, the scanning control means d is executed even if the touch keys b related to the signal lines in the odd rows and odd columns are not assigned and displayed, and the signal lines in the odd rows or columns are scanned. Therefore, without scanning all 10 signal lines in odd rows or odd columns, it is possible to scan the 5 signal lines in even rows or even columns related to touch key b to which characters, etc. are assigned and displayed. Only, for example ゛′H
Scanning is performed by sequentially outputting a scanning signal of '° level.

Therefore, only necessary lines can be selectively scanned.

[Example] An example will be described below with reference to FIGS. 2 to 4.

FIG. 2 is a system configuration diagram of a handy terminal using an input display device, which includes, in addition to the touch panel 1, a control section 2, a ROM 3, a RAM 4, a memory card 5, and a printing section 6.

The touch panel 1 has a structure in which a plurality of touch keys 1b are placed on a liquid crystal display panel 1a. Characters, etc. are assigned to the touch keys 1b under the control of the control unit 2, and the assigned characters, etc. are displayed on the liquid crystal display panel 1.
a, the touch key 1b is displayed at a position directly below the touch key 1b to be assigned. The touch key 1b is made of a transparent member so that even if characters or the like are displayed directly below the touch key 1b, the displayed contents can be seen from above the touch key 1b. Further, as shown in FIG. 5, the touch key 1b has a plurality of X lines a, b, C, .
Lines (1), (2), (2) are provided in an X-Y matrix between them.

The control unit 2 includes a CPU, and when the touch key 1b is operated, according to the program preset in the ROM 3,
Various types of processing are performed by inputting the characters assigned and displayed to the touch keys 1b related to the operation, and the processing results are stored in the RAM 4.
Various controls such as storage in the memory card 5, printing in the printing unit 6, and saving in the memory card 5 are performed.

Further, the control unit 2 performs a key scan to detect the operation state of the touch key 1b. This key scan is performed by sequentially outputting "H" level scanning signals to the X lines a, b, c... and sequentially reading the output signals of the Y lines ■, ■, ■... , the scanning signal is output only to the X lines a, b, C, . . . corresponding to the touch keys 1b to which characters and the like are assigned and displayed. That is, only valid X lines a, b, c, . . . are scanned.

Next, key scan control processing will be explained with reference to FIGS. 3 and 4.

To simplify the explanation, an example will be described in which the assignment display of characters, etc. to the touch keys 1b is made as shown in FIG. 3.

In the example of FIG. 3, characters are assigned and displayed only to the touch keys 1b corresponding to the X lines a, b, d, and e, so only the X lines a, b, d, and e are scanned.

That is, in this case, the control unit 2 first outputs an "H" level scanning signal only to the X line a (the fourth
Step S1>, read the output signals from Y lines ■ to ■ for this scanning signal (step S2), and determine whether the output signal from Y line ■ or ■ is "H". Step S3), “H
”, it corresponds to the case where the touch key 1b to which “A” is assigned and displayed shown in FIG. 3 is operated, so “A”
” is inputted (step S4), and the process proceeds to step S9.

On the other hand, when the output signal from the Y line (2) or (2) is not "H", an "H" level scanning signal is output only to the X line b (step S5).

Then, the Y line ■～■ for this scanning signal
(step S6), and it is determined whether the output signal from the Y line ■ or ■ is "°°H" (step S7).
” corresponds to the case where the touch key 1b assigned and displayed is operated, so “A” is inputted (step S8).
, proceed to step S13.

On the other hand, when the output signal from the Y line (2) or (2) is not "H", a scanning signal at the "H" level is output only to the X line d (step S9).

Then, the Y line ■～■ for this scanning signal
If the output signal from the Y line ■ or
” is inputted (steps SIO to 512), and the process returns to step S1.

When the output signal from the Y line ■ or ■ is not "°H" in response to the scanning signal to the X line d, a scanning signal at the "°H'° level is output only to the X line e (step 813), and Read the output signals from Y lines ■～■ for this scanning signal,
If the output signal from line ■ or ■ is H”, “B
” corresponds to the case where the touch key 1b assigned and displayed is operated, so “B” is inputted (step 31).
4 to 516), the process returns to step S1. Also, X line e
If the output signal from Y line ■ or ■ is not "H°' in response to the scanning signal to
Return to l.

In this way, in the example of the allocation display shown in FIG. 3, only 2 to 4 lines need to be scanned per scan cycle.
Compared to the conventional method of scanning all eight lines, the number of scans per scan cycle is significantly reduced.

[Effects of the Invention] According to this invention, only necessary lines can be selectively scanned, and the number of scans per scan cycle is reduced, which saves power consumption, improves scanning efficiency, and improves ease of use. will improve. Therefore, it is particularly effective when used in portable electronic devices such as handheld terminals.

A system configuration diagram of the embodiment, FIG. 3 is a diagram showing an example of displaying assignments of characters, etc. to touch keys, FIG. 4 is a flowchart showing key scan control processing corresponding to the assignment display example of FIG. 3, and FIG. FIG. 6 is a diagram for explaining the prior art. FIG. 6 is a diagram for explaining the problems of the prior art.

1-...Touch panel, 1a...Liquid crystal display panel, 1
b...Touch key, 2...Control unit, 3-...ROM
.

Claims (1)

[Claims] In an input display device in which a plurality of touch keys arranged in a matrix between a plurality of signal lines in the row direction and column direction are installed on a display section, an arbitrary function is provided for the touch keys. a display control means for allocating and displaying characters, etc.; and a scanning control means for sequentially scanning only the signal lines in the row direction or column direction related to the touch keys to which the characters, etc. are allocated and displayed by the display control means. Characteristic input display device.