JPH07270749A - Method for controlling luminance of lcd - Google Patents

Abstract

PURPOSE:To ensure the luminance control of an LCD even when the display screen of the LCD is invisible due to abrupt temperature drop in the case where the luminance control key is installed in the display area of the LCD. CONSTITUTION:When a touch key 6B is arranged on the under surface of an LCD 6A, and the depression of an LCD luminance control key attached to the display area of the LCD is detected as the output of the touch key, a power source switch 11 having a power supply switch 11A which supplies power to the device and a push-button 11B which sets the ringing of various types of tones and non-ringing in the device after power is turned on, is installed to control the luminance of the LCD on detecting the operation of the push button within a certain period of time after power is turned on.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LCD and this LCD.
The present invention relates to an LCD brightness adjusting method for adjusting the brightness of the LCD in a touch panel including a touch key formed on the lower surface of the LCD.

[0002]

2. Description of the Related Art A touch panel of this type used in various devices is found to have all operation keys in the display area of an LCD because of the demand for downsizing the device. When a key display area of such a touch panel is operated, this operation information is detected as an output of a touch key formed on the lower surface of the LCD, and processing according to various key operations is performed.

[0003]

In a device using such a touch panel, an LCD is required in order to reduce the size of the device.
Since all the operation keys are provided in the display area of, the operation keys for adjusting the brightness of the LCD are naturally provided in the display area of the LCD. For this reason, when the brightness of the LCD decreases due to a sudden decrease in ambient temperature, the display screen becomes invisible, so the operation keys cannot be operated, and thus the brightness of the LCD cannot be adjusted.

Therefore, it is an object of the present invention to surely adjust the brightness of the LCD even if the display screen of the LCD disappears due to a sudden temperature drop.

[0005]

In order to solve such a problem, the present invention comprises an LCD and a touch key formed on the lower surface of the LCD, and displays the brightness of the LCD in the display area of the LCD. Has an area for operation keys to adjust,
In a device that detects pressing of the operation key area as an output of a touch key and adjusts the brightness of the LCD, a first switch that turns on the power of the device and various tone tones or non-ring in the device after the power is turned on. An LC that adjusts the brightness of the LCD by providing a power switch having a second switch for setting and detecting the operation of the second switch within a fixed time after the power is turned on by closing the first switch.
The D brightness adjustment mode is entered. If the output of the touch key is detected within a fixed time after the power is turned on by closing the first switch of the power switch, L
The CD brightness adjustment mode is canceled.

[0006]

When the operation of the second switch of the power switch is detected within a fixed time after the power is turned on, the LCD brightness adjustment mode for adjusting the brightness of the LCD is entered. As a result, the display temperature of the LCD becomes difficult to see due to the sudden decrease in the ambient temperature, and therefore the brightness can be easily adjusted even when the operation key for adjusting the brightness on the display screen cannot be operated. Further, when the output of the touch key is detected within a fixed time after the power is turned on by closing the first switch of the power switch, the LCD brightness adjustment mode is released. As a result, L
When the CD display screen is good, the brightness adjustment is performed only by the operation keys on the original display screen, and the brightness adjustment by the second switch can be avoided, so that unnecessary confusion in operation can be prevented.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention.
The device of this embodiment is a device using a touch panel including an LCD and touch keys. In FIG. 1, 1 is a CPU for controlling the entire apparatus, 2 is a ROM for storing a program executed by the CPU 1, 3 is a RAM for temporarily storing data, and 4 is image data to be displayed on an LCD (display screen). A RAM 5 for storing (data) is an LCD controller for controlling the display of the LCD.

Further, 6 is the above-mentioned touch panel,
The LCD 6A and the touch key 6B formed on the lower surface of the LCD 6A. Further, 7 is a touch key control unit that performs control for detecting the operation of the touch key 7, 8 is an A / D conversion unit that converts the operated touch key output to digital and transmits it to the CPU 1, and 9 is various types. A gate array 10 in which gate circuits are integrated is a buzzer for outputting various tones. Further, 11 is a power switch including a power-on switch 11A and a push button 11B, 12 is a battery, 13
Is a power supply control unit that supplies power from the battery 12 as the device voltage V by closing the power-on switch 11A.

Here, the RAM 4 stores L as described above.
The image data for the display screen of CD6A is stored,
When power is supplied from the power supply controller 13 by closing the power-on switch 11A, the CPU 1 causes the LCD controller 5 to display the display screen stored in the RAM 4 on the LCD 6
Instruct A to display. Then, the LCD controller 5 transfers the display screen data of the RAM 4 to the LCD 6A and displays it on the display screen. Various operation keys are displayed in each area of the display screen of the LCD 6A, and when this operation key is pressed, the corresponding portion of the touch key formed on the lower surface of the LCD 6A is closed.

The closed output of the touch key 6B is converted into a digital signal by the A / D converter 8 via the touch key controller 7 and transmitted to the CPU 1. The CPU 1 can recognize which operation key on the display screen of the LCD 6A is pressed by the output of the touch key 6B. Further, the power switch 11 is provided with the push button 11B as described above, and when the push button 11B is operated after the device is powered on, this operation output is transmitted to the CPU 1 through the gate array 9. , CPU1 recognizes that push button 11B is operated. In this case, the CPU 1 determines whether or not various tones are sounded in the device, that is, whether or not the buzzer 10 is valid.

That is, when an incoming call arrives from another device via a wireless unit (not shown) housed in this device, it is determined whether or not the ring tone is sounded from the buzzer 10 according to the operation of the push button 11B. By the way, an LCD brightness adjustment key for adjusting the brightness of the LCD is provided in the display screen area of the LCD 6A, and the brightness of the display screen can be adjusted to a good state by operating this key. However, in the LCD 6A, when the ambient temperature sharply decreases, the brightness of the display screen decreases, making it difficult to see. Therefore, even if an attempt is made to adjust the brightness, the LCD brightness adjustment key cannot be seen, and the brightness cannot be adjusted. . For this reason,
In the apparatus of this embodiment, the brightness of the LCD 6A can be adjusted by operating the push button 11B described above for a certain period after the power is turned on.

FIG. 2 is a flow chart specifically showing the operation of the CPU 1 for performing such LCD brightness adjustment. The main operation of the present invention will be described in detail with reference to this flowchart. When activated by closing (turning on) the power-on switch 11A, the CPU 1 activates a timer for a fixed time. Here, during the above-described fixed time during the timer operation, “whether the timer monitoring time has been reached” in step ST1 is “N”, so that the CPU 1 causes the above-mentioned LC
In step ST2, the touch key 6 is pressed in order to detect the presence / absence of operation of the LCD brightness adjustment key being displayed in the display area of D6A.
Whether or not B is input is determined.

When the operator can recognize the display screen of the LCD and the operator operates the LCD brightness adjustment key to improve the LCD brightness, step ST
The touch key input of No. 2 becomes "Y". In this case, the brightness of the LCD 6A is adjusted according to the detection output of the touch key 6B, and the process proceeds to step ST3. Also, when another key on the display screen is operated, the process proceeds to step ST3. At step ST3, the power-on switch 11
After confirming that A is turned on, it is determined in step ST4 whether or not the setting by the push button 11B is the valid mode of the buzzer 10. And push button 11B
If the setting by is in the valid mode of the buzzer 10,
For example, when an incoming call arrives at the device, a buzzer enable process for outputting a ring tone from the buzzer 10 is performed in step ST5.

If the push button 11B is set to the buzzer invalid mode, a buzzer invalid process is performed so that the ring tone does not sound from the buzzer in step ST6 when an incoming call arrives. Then, when the use of the device is completed and the power-on switch 11A is turned off by the operator, the result is "Y" in step ST3, the device power is turned off in step ST7, and the CPU 1 stops its operation. In addition, when the brightness of the display screen of the LCD 6A decreases due to the sudden temperature decrease and the operator cannot recognize the LCD brightness adjustment key described above, the operator presses the push button 11B in the power switch 11 in step ST8.

The CPU 1 is a push button 1 by the operator.
When the operation of 1B is detected, the LCD 6A is displayed in step ST9.
It is determined whether or not the contrast (brightness) of the LCD is the darkest, and if it is "N", the contrast of the LCD is set to the darkest one step in step ST10 and the step ST
Return to 1. Further, when the contrast of the LCD 6A is the highest and it is determined to be "Y" in step ST9, the contrast is set to the lowest state in step ST11, and the process returns to step ST1.

Thus, the optimum contrast of the LCD can be obtained by operating the push button 11B. LCD with the push button 11B of the power switch 11
The contrast adjustment is allowed for a certain period of time until the timer times out, and when the certain period of time elapses and the "timer monitoring time?" In step ST1 becomes "Y", this brightness adjustment function is canceled. The function of the push button 11B is only the setting function of "buzzer valid" and "buzzer invalid" shown in and after step ST4.

In this way, the LC is
The contrast adjustment mode of D6A is entered, and by operating the push button 11B of the power switch 11 which originally has the setting function of "buzzer enable" and "buzzer disable", the LC
The D contrast is adjusted. As a result, the LCD screen becomes difficult to see due to a sudden decrease in ambient temperature, and when the LCD brightness adjustment key provided in the LCD display area cannot be operated, the push button 11 is pressed.
By operating B, the LCD contrast can be adjusted.

Further, the ambient temperature does not decrease, and therefore L
If the CD screen is not difficult to see, the above-mentioned LCD brightness adjustment keys and other keys on the LCD screen can be operated by the operator. In such a case, each of the above-mentioned keys can be operated within a certain time after the power is turned on. When it is operated, "Is touch key input?" In step ST2 becomes "Y". Therefore, in this case, the LCD brightness adjustment mode by the push button is released, and the operation of the push button 11B is the original "buzzer effective". And, it has only the setting function of "buzzer disabled". As a result, if the LCD display screen is good, the LCD brightness adjustment key on the original LCD display screen
Since the brightness adjustment is performed and the brightness adjustment by the push button 11B is avoided, unnecessary confusion in operation can be prevented.

[0019]

As described above, according to the present invention, L
A CD and a touch key formed on the lower surface of the LCD are provided, an operation key area for adjusting the brightness of the LCD is provided in the display area of the LCD, and pressing of the operation key area is detected as an output of the touch key. In the device for adjusting the brightness of the LCD, the power is turned on to the device.
Switch and a power switch having a second switch for setting ringing / non-ringing of various tones in the device after turning on the power, and operating the second switch of the power switch within a certain time after turning on the power. Is detected, LC
When the LCD brightness adjustment mode for adjusting the brightness of D is entered, it becomes difficult to see the LCD display screen due to a sudden decrease in ambient temperature, and therefore the operation key for adjusting the brightness on the display screen cannot be operated. However, the brightness can be easily adjusted. In addition, when the output of the touch key is detected within a fixed time after the power is turned on by closing the first switch of the power switch, the LCD brightness adjustment mode is canceled. Therefore, when the LCD display screen is good,
The brightness adjustment is performed only by the operation keys on the original display screen, and the brightness adjustment by the second switch can be avoided, so that unnecessary confusion in operation can be prevented.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the apparatus of the above embodiment.

[Explanation of symbols]

1 ... CPU, 3, 4 ... RAM, 5 ... LCD controller, 6 ... Touch panel, 6A ... LCD, 6B ... Touch key, 7 ... Touch key control section, 8 ... A / D conversion section, 11 ...
Power switch, 11A ... Power on switch, 11B ... Push button, 12 ... Battery, 13 ... Power control unit.

Claims (2)

[Claims] 1. An LCD and a touch key formed on the lower surface of the LCD are provided, and an operation key area for adjusting the brightness of the LCD is provided in a display area of the LCD, and the operation key area is depressed. A device for adjusting the brightness of an LCD when detected as the output of the touch key, for setting a first switch for turning on the power of the device and for setting ringing / non-ringing of various tones in the device after the power is turned on. An LCD brightness adjustment mode in which a power switch having a second switch is provided, and the brightness of the LCD is adjusted when the operation of the second switch is detected within a fixed time after the power is turned on by closing the first switch. LCD brightness adjustment method characterized by shifting to. 2. The LCD brightness adjustment method according to claim 1, wherein when the output of the touch key is detected within a fixed time after the power is turned on by closing the first switch of the power switch, the LCD brightness adjustment is performed. LCD brightness adjustment method characterized by releasing the mode.