JPH01200398A - Cursor display control system - Google Patents

Abstract

PURPOSE:To make a cursor visible even when the cursor moves at a high speed by detecting the response speed of a liquid crystal display panel which varies corresponding to a driving voltage, temperature, etc., by a detection part and making the length of the cursor in the movement longer than that in a stationary state according to the detected response speed. CONSTITUTION:The detection part 4 is provided which detects the response speed of the liquid crystal display panel 1 varying corresponding to the driving voltage, temperature, etc., of the liquid crystal display panel 1 and when the cursor 2 of the liquid crystal display panel 1 is moved and displayed by a driving control part 3, the length of the cursor 2 is made longer than that of a stationary display according to the response speed of the liquid crystal display panel 1. Therefore, when the response speed of the liquid crystal display panel 1 becomes slow, the driving control part 3 increases the length of the cursor 2 and drives it, so the cursor 2 is driven for a longer time than the response time at a certain position in the movement process. Consequently, the cursor which is visible can be displayed.

Description

[Detailed Description of the Invention] [Summary] Regarding a cursor display control method that enables high-speed movement display of a cursor, the present invention aims to make the cursor visible even when the cursor moves at high speed, and the cursor is driven on a liquid crystal display panel. In a cursor display control method in which display is performed under control from a control section, a detection section is provided for determining the response speed of the liquid crystal display panel, which changes in accordance with the drive voltage, temperature, etc. of the liquid crystal display panel, and the detection section According to the determined response speed, the length of the cursor during movement is controlled to be longer than the length when the cursor is at rest.

[Industrial application field]

The present invention relates to a cursor display control method that enables high-speed movement and display of a cursor.

A cursor is used to indicate a position within the display area of a display device, and when inputting characters, it is sequentially shifted each time a character is input to indicate the next character input position. become. Furthermore, the cursor can be moved in any direction using the cursor movement key.

[Conventional technology]

When moving the cursor by operating the cursor movement keys on the display device, even if the cursor moves slowly, there is no problem if the moving distance is short, but if the moving distance is long, the cursor may reach the target position. This has the disadvantage that it takes a long time to complete the process, making it inconvenient to operate. Therefore, a control method is known in which the cursor is moved at high speed when the cursor has a long moving distance.

Also, in display devices using liquid crystal display panels, the switching speed of the cursor is controlled according to the moving distance of the cursor as described above, but liquid crystal display panels have a lower response than cathode ray tubes. Since the speed is slow, it is difficult to visually display a cursor moving at high speed.

Therefore, a method has been proposed in which when moving the cursor, the length is controlled to be a certain length longer than the length when the cursor is stationary (for example, Japanese Patent Laid-Open No. 62-50897
(see publication). In other words, by increasing the length of the cursor by a certain length and displaying it moving, the driving time for the position where the movement process takes place becomes longer than when the cursor is driven at the same length when the cursor is stationary, resulting in a slow response. Even in liquid crystal display panels,
This means that the cursor that moves at high speed can be displayed so that it can be seen visually.

[Problem to be solved by the invention] The response speed of a liquid crystal display panel is not always constant, but is affected by ambient temperature, driving voltage, etc. For example, when the temperature drops or when display brightness is adjusted When the drive voltage is lowered, the response speed becomes slower. Therefore, even if the length of the cursor is increased by a certain amount when moving the cursor, as in the conventional example described above, the cursor may not be visible if the operating conditions slow down the response time of the LCD panel. This makes it difficult to set the cursor position at high speed. Therefore, high-speed movement of the cursor is restricted.

An object of the present invention is to make the cursor visible even when the cursor is moving at high speed.

[Means to solve the problem]

The cursor display control method of the present invention is for displaying a cursor by setting the length of movement of the cursor in accordance with the response speed of the liquid crystal display panel, and will be described with reference to FIG.

A detection unit 4 is provided to determine the response speed of the liquid crystal display panel l which changes in response to the drive voltage, temperature, etc. of the liquid crystal display panel 1, and when the drive control unit 3 causes the cursor 2 on the liquid crystal display panel 1 to be displayed in a moving manner. , the control section makes the length of the cursor 2 longer than in the case of static display according to the response speed of the liquid crystal display panel l.

[Effect]

The response speed of the liquid crystal display panel 1 becomes slower when the driving voltage of the liquid crystal display panel 1 is lowered, and also becomes slower when the temperature is lowered. Since such a relationship can be measured in advance, it is possible to The response speed can be determined by measuring . It is also possible to determine the response speed by detecting the actual transmitted light or reflected light of a partial area of the liquid crystal display panel 1.

When the cursor 2 is moved, it is controlled to be longer than the length when it is displayed statically, as shown by the dotted line, according to the response speed.

Therefore, when the response speed of the liquid crystal display panel 1 becomes slow, the drive control unit 3 increases the length of the cursor 2 and drives the cursor 2, so that at the position where the cursor 2 is moving, the response time The cursor will be driven for a long time, allowing the cursor to be displayed visually.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a block diagram of an embodiment of the present invention, in which 11 is a liquid crystal display panel, 12 is a cursor, 13 is a drive section, 14 is a control section, 15 is a frame memory, 16 is a write control section, 1
7 is a cursor control unit, 18 is a cursor movement key, 19 is a microprocessor (MPU), 20 is a light sensor, 2
1 is a temperature sensor, and 22 is a voltage sensor.

The detection unit 4 in FIG. 1 is configured by one or more of the optical sensor 20, the temperature sensor 21, and the voltage sensor 22, and the microprocessor 19, and the drive unit 1
3, the control section 14, the frame memory 15, the write control section 16, and the cursor control section 17 constitute the drive control section 3 in FIG.

The optical sensor 20 detects transmitted light or reflected light by using a liquid crystal cell in a part of the display area of the liquid crystal display panel 11.
It detects the temperature of 1. Moreover, the voltage sensor 22 is
By controlling the display brightness and the like of the liquid crystal display panel 11, the drive voltage from the drive section 13 changes, so the drive voltage is detected.

Furthermore, the microprocessor 19 is programmed in advance with respect to the relationship between temperature, drive voltage, and response speed of the liquid crystal display panel 11, so that the microprocessor 19 can calculate the response speed by calculation,
Alternatively, the response speed can be determined using a table consisting of a read-only memory or the like. Further, the response speed can also be directly determined based on the drive signal from the drive section 13 and the detection signal from the optical sensor 20. Further, the cursor length corresponding to this response speed can be determined and added to the cursor control section 17.

In addition, the control unit 14 controls the driving unit 13 and the frame memory 15.
The display data is written to the frame memory 15 via the write control unit 16, and a drive voltage is applied from the drive unit 13 to the liquid crystal display panel 11 according to the contents of the frame memory 15. will be displayed. Further, when the cursor movement key 18 is operated, cursor position information is added from the cursor control section 17 to the write control section 16 according to the direction of movement, etc., cursor display information is written to the frame memory 15, and the drive section 13 is controlled. Since the cursor position is sequentially updated by the cursor control unit 17, the cursor 12 on the liquid crystal display panel 11 is moved and displayed.

In this case, since the response speed of the liquid crystal display panel 11 is determined by the microprocessor 9, the cursor control unit 17 adjusts the length of the cursor 12 to increase as shown by the dotted line according to the response speed. Control.

In controlling the movement of the cursor 12, the time required to operate the cursor movement key 18 is as shown by the solid line in FIG.
When the cursor movement speed is set to Vcl when the speed is T1 or less, and when the cursor movement speed is set to Vc2 when the speed is higher than that, the length of the cursor 12 when the cursor movement speed is Vcl is the same as when the cursor is at rest. When the cursor movement speed is VC2, the length of the cursor 12 can be controlled to be longer in accordance with the response speed of the liquid crystal display panel 11.

Also, as shown by the dotted line, the cursor movement speed Vcl to Vc
If the cursor increases linearly to 2, the cursor 1 is
It is also possible to control the length of 2. If two types of cursor movement keys 18 are provided, one for low speed and one for high speed, the length of the cursor 12 is controlled to be longer when the high speed cursor movement key is operated.

Figure 4 is a response speed characteristic curve diagram, using a TN liquid crystal,
Temperature: 25℃, liquid crystal cell thickness (distance between substrates): 10μm
The rise time τ and fall time τ6 with respect to the drive voltage in the case of . The rise time τ of the response speed decreases approximately in proportion to the square of the drive voltage, and the fall time τ,
The drive voltage range is 3 to 10V, and the distance is approximately 40 to 100m.
It becomes 5. Therefore, when the drive voltage of the liquid crystal display panel 11 is lowered to adjust the display brightness, the rise time suddenly becomes longer, and when the cursor 12 is moved at high speed, it is simply extended to a certain length. There may be cases where visual inspection becomes impossible with only control.

However, in the present invention, the response speed of the liquid crystal display panel 11 is detected, and the cursor 12 is adjusted accordingly.
Since the length of is controlled to be long, even if the cursor 12 is moved at high speed when the response speed is slow, the control can be visually observed. Furthermore, when the response speed becomes faster, the length of the cursor 12 is shortened, so that the length of the moving cursor 12 can be displayed as a natural length.

Furthermore, when the temperature of the liquid crystal display panel 11 changes, its response speed also changes, resulting in the response speed characteristics shown in FIG. That is, the temperature of the liquid crystal display panel 11 (l O3/T
(absolute temperature)] is shown on the horizontal axis and the response speed (ms) is shown on the vertical axis, 10''/T=3 (=60°C) ~ 3.9
(=-17°C), as the temperature rises, the rise time τ and fall time become shorter than 4, and on the other hand, as the temperature decreases, the rise time τ and fall time τ become longer. Therefore, when the cursor 12 is moved at high speed when the temperature drops, the response speed of the liquid crystal display panel 11 is slow, so the length of the cursor 12 is controlled to be longer. Visible and moving display. Furthermore, when the temperature rises and the response speed becomes faster, the extended length of the cursor 12 is shortened, so that the length of the moving cursor 12 can be displayed as a natural length.

FIG. 6 shows a block diagram of the cursor control section 17, 31
32 is a ±1 circuit, 33 is a timer, 34.35 is an X and Y cursor register, 36.37 is a complementer, 38.39 is an adder, and 40. is a register for setting cursor length data.
41 is an end point register.

Cursor length data corresponding to the response speed of the liquid crystal display panel 11 determined by the microprocessor 19 (see FIG. 2) is set in the register 31 and added to the complementers 36 and 37. In addition, + instructed by the cursor movement key 18
The ±1 circuit 32 controls the X cursor register 34 and the
The contents of the cursor register 35 are added and subtracted, and the contents become the starting point coordinates and are added to adders 38 and 39.

Further, when the cursor movement key 18 is pressed, the timer 33 is started and the timer 33 is activated for a predetermined time (for example, time Ti in FIG. 3).
If the cursor movement key 18 is continuously pressed, the repetition speed of addition and subtraction in the ±1 circuit 32 is switched from low speed to high speed by the output of the timer 33. That is, the moving speed of the cursor is switched from low speed to high speed. Through this switching control, control is performed to extend the length of the cursor from when it is at rest.

The complementers 36 and 37 are controlled to output the complement of the contents of the register 31 in accordance with the moving direction of the cursor, and have the relationship shown in the following table.

In the table, the X mark indicates the case where the complement is not used, the ○ mark indicates the case where the complement is used, and the - mark indicates the case where there is no relation.

Adders 38 and 39 add the contents of the X,
Set to 0.41 to be the extended end point coordinates of the cursor.

That is, when the cursor moves at high speed, the start point coordinates and end point coordinates are set as values corresponding to the moving direction of the cursor according to the cursor length data, and the start point coordinates and end point coordinates are set as values corresponding to the moving direction of the cursor, and the start point coordinates and the end point coordinates are set as values corresponding to the moving direction of the cursor. will be advanced.

These starting point coordinates and ending point coordinates are added to the write control section 16 (see FIG. 2), and the cursor is written into the frame memory 15 according to these coordinates. Therefore, the cursor displayed on the liquid crystal display panel 11 is extended to a length between the starting point coordinates and the ending point coordinates, and is moved and displayed in accordance with the addition/subtraction speed in the ±1 circuit 32.

For example, if the cursor movement direction is -X and the cursor length data indicates the length of one character, the cursor length data of the length of one character set in the register 31 is
is output as a complement and added to the adder 38, and the contents of the X cursor register 34 are subtracted by the ±1 circuit 32. Therefore, the end point coordinates added from the adder 38 to the end point register 40 and set are X
The cursor register 34 allows the cursor to be moved to the left and displayed as a cursor that is on the left side in the display area according to the start point coordinates and has a length of two characters between the start point coordinates and the end point coordinates according to the cursor length data. Therefore, it is actually seen as a cursor with a length of one character.

7 and 8 show block diagrams of main parts of the detection section, and FIG. 7 shows a temperature sensor 5 that detects the temperature of the liquid crystal display panel.
1 and a voltage sensor 52 that detects the drive voltage of the liquid crystal display panel, and the detection output signals are converted into, for example, 4 bits (16 levels) by A/D converters 53 and 54. The conversion table 55, which stores cursor length data corresponding to the response speed determined in advance from the relationship between temperature and drive voltage, is converted into a digital signal of the configuration to form a total of 8 bits of address signal. The cursor length data is accessed by the address signal and sent to the register 31 shown in FIG.

FIG. 8 shows an embodiment in which a photosensor 62 is used. For some liquid crystal cells in the display area of the liquid crystal display panel 61, when the liquid crystal display panel 61 is of a reflective type, light #64 is sent to the photosensor. 62 side, and if the liquid crystal display panel 61 is a transmissive type, a light source 65 is provided on the back side.

When a driving voltage is applied from the driving section 63 to the liquid crystal cell whose reflected light or transmitted light is detected by the optical sensor 62,
When a start signal ST is applied to the counter 66 to start counting the clock signal, a detection signal from the optical sensor 62 is applied to the counter 66 as a stop signal sp, and a predetermined reflected light level or transmitted light level is reached from the time of voltage application. The count value is used as an address signal for the conversion table 67, and cursor length data corresponding to the response speed is read from the conversion table 67. Note that by selecting the period of the clock signal, the count contents of the counter 660 can be made directly into a value indicating the cursor length.

Conversion tables 55.67 are read-only memory (R
A/D converter 53.5
4 and the counter 66, etc., as part of the configuration of the microprocessor 19.

Although it is possible to obtain the cursor length data repeatedly at any time, it is also possible to control the above-mentioned conversion tables 55 and 67 to be accessed when the cursor movement key 18 is operated. Further, the above-mentioned detection section may be operated at regular intervals.

FIG. 9 shows the relationship between driving time and response speed. In the case of the response characteristic shown by the solid line in (a), the rise time τ and the longer time t
1. By applying a driving voltage as shown in (bl), a contrast with the background is obtained and becomes visible. Also, in the case of the response characteristic indicated by the dotted line in (al), the rise time τ, If it is short, the contrast with the background is insufficient, making it difficult to see visually.In that case, by applying the driving voltage for a time t2 longer than the rise time τ, 9, a visually visible bushing state is created. , when moving the cursor, when the response speed of the LCD panel becomes slow, the length of the cursor is made longer than when it is stationary, which essentially lengthens the application time of the drive voltage, even when moving at high speed. It becomes visible and the cursor can be set to the target position at high speed.

〔Effect of the invention〕

As explained above, in the present invention, when moving the cursor 2 displayed on the liquid crystal display panel 1, the response speed of the liquid crystal display panel 1 is determined by the detection unit 4, and the length of the cursor 2 is determined in accordance with the response speed of the liquid crystal display panel 1. The display is made longer than when it is at rest, and can be made visible when the cursor 2 is moved at high speed on the liquid crystal display panel 1 whose response speed changes significantly depending on temperature, driving voltage, etc. Therefore, there is an advantage that the cursor 2 can be set at high speed.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the principle of the present invention, Fig. 2 is a block diagram of an embodiment of the invention, Fig. 3 is an explanatory diagram of cursor movement speed, and Fig. 4 is an explanatory diagram of the cursor movement speed.
5 and 5 are response speed characteristic curves, FIG. 6 is a block diagram of the cursor control section of the embodiment of the present invention, and FIGS. 7 and 8 are
The figure is a block diagram of the main part of the detection section of the embodiment of the present invention, and FIG. 9 is an explanatory diagram of response speed. 1 and 11 are liquid crystal display panels, 2 and 12 are cursors, 3 is a drive control unit, 4 is a detection unit, 13 is a drive unit, 14 is a control unit, 15 is a frame memory, 16 is a write control unit, and 17 is a cursor The controller includes a cursor movement key 18, a microprocessor (MPU) 19, a light sensor 20, a temperature sensor 21, and a voltage sensor 22.

Claims (1)

[Claims] In a cursor display control method in which a cursor (2) is displayed on a liquid crystal display panel (1) under control from a drive control unit (3), the drive voltage and temperature of the liquid crystal display panel (1) are A detection unit (4) is provided for determining the response speed of the liquid crystal display panel (1) that changes in response to the A cursor display control method characterized by controlling the length to be longer than the length when it is at rest.