JP3922081B2 - Mobile phone with display speed switching function - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mobile phone with a display speed switching function, and more particularly to a mobile phone capable of adjusting image quality with an easy operation in accordance with a user's request and a situation in which the mobile phone is used.
[0002]
[Prior art]
Conventional mobile phones are provided with an image display device such as an LCD, and can display still images and frame-by-frame images captured by a digital camera as well as still images of characters and figures.
In addition, among the above mobile phones, there are mobile phones that scroll display characters or turn on the display unit when a built-in vibration sensor detects vibration in order to improve the operability of image display.
[0003]
For example, Japanese Patent Laid-Open No. 11-305748 proposes a mobile phone that includes a horizontal vibration detection device and a vertical vibration detection device and scrolls display characters in accordance with the vibration direction.
In this mobile phone, when the user shakes the mobile phone, the displayed screen is scrolled in a direction corresponding to the vibration direction, so that the operability of the display screen can be improved when reading characters.
[0004]
In Japanese Patent Laid-Open No. 2001-251419, an operation that is frequently used is associated with vibration detection in the vibration sensor by user's arbitrary selection, thereby improving operability while following the user's usage pattern. A technology of a mobile communication terminal with a vibration sensor and a recording medium on which the program is recorded is disclosed.
[0005]
According to this technology, for example, when lighting of the display unit is associated with detection of vibration of the vibration sensor, the display unit can be lit only by applying vibration to the mobile communication terminal, which is a case where the user is in the dark. However, it is possible to improve poor operability such as having to search for the key to be pressed in a groping state.
[0006]
By the way, in recent years, various technologies have been developed and put into practical use because various manufacturers actively develop technologies.
For example, with regard to image display technology, a technology for displaying a moving image, a technology for increasing the frame feed speed, and the like have been put into practical use.
In addition, a technique for improving the image quality by increasing the screen refresh rate or the display rewriting rate has been put into practical use.
[0007]
Mobile phones are required to have higher functionality as described above, while on the other hand, by reducing current consumption, it is required to extend the charge cycle and consequently reduce size and weight. Yes.
For this reason, the mobile phone slows down the rewrite cycle when displaying moving images, slows down the frame advance rate when displaying frame-by-frame images, and increases the screen refresh rate when displaying still images such as characters and graphics. It is necessary to slow down or increase the screen refresh time interval.
That is, the mobile phone is required to reduce current consumption as much as possible while ensuring image quality.
[0013]
[Problems to be solved by the invention]
However, mobile phones are used in various situations such as stationary, walking, moving in trains, cars, etc., and image quality may be reduced due to camera shake or forced vibration from the outside. It was difficult to see).
In addition, since the current consumption of a conventional mobile phone may be increased, an image with excellent image quality may be displayed, or the image quality may be reduced. There was a problem that it was not possible to cope with.
Furthermore, when adjusting the image quality, it is required that the image quality can be adjusted with a simple operation.
[0014]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a mobile phone capable of adjusting the image quality with an easy operation according to a user's request and a situation in which the mobile phone is used. .
[0015]
[Means for Solving the Problems]
In order to achieve the above object, a mobile phone with a display speed switching function according to the present invention is a mobile phone with a display speed switching function provided with an operation unit, a vibration detection unit, and a display unit, wherein the vibration detection unit A control unit that controls display speed switching of the display unit based on the vibration signal, and when the vibration detection unit detects a vibration signal during use of the mobile phone, The control unit that has input the vibration signal switches the screen refresh rate to be faster than the screen refresh rate when the vibration signal is not input, and / or inputs the vibration signal at a screen refresh time interval. The screen is switched to be shorter than the screen refresh time interval when it is not.
By doing so, the image quality can be automatically improved when the mobile phone is vibrated.
[0016]
Further, in the mobile phone with a display speed switching function of the present invention, when the control unit that has input the vibration signal during use stops inputting the vibration signal, the screen refresh rate and / or the screen refresh time interval. Is returned to the screen refresh rate when the vibration signal is not input and / or the time interval of the screen refresh when the vibration signal is not input.
In this way, when the mobile phone is not subjected to vibration, the display speed is automatically restored, so that the current consumption can be effectively reduced.
[0017]
In the mobile phone with a display speed switching function of the present invention, the larger the input vibration signal is, the higher the screen refresh speed is switched than the screen refresh speed when the vibration signal is not input, and Alternatively, the screen refresh time interval is switched to be shorter than the screen refresh time interval when the vibration signal is not input.
In this way, the image quality can be improved by a necessary amount according to the magnitude of vibration that the mobile phone receives.
[0018]
The mobile phone with a display speed switching function of the present invention includes a switching key for switching images, and when the switching key is pressed, the currently displayed moving image, frame advance image, or still image is sequentially switched and displayed. It is as composition to do.
Thus, the image quality and the current consumption can be adjusted by changing the display image.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Next, a preferred embodiment of a mobile phone with a display speed switching function (appropriately abbreviated as a mobile phone) according to the present invention will be described with reference to the drawings.
[0022]
FIG. 1: has shown the schematic block diagram for demonstrating the structure of the principal part of the mobile telephone with a display speed switching function concerning embodiment of this invention.
In the figure, a cellular phone 1 includes an antenna 11, a radio circuit unit 12 that transmits and receives radio signals, a control circuit unit 2 that performs operation control according to a program, an operation unit 13 provided with operation keys, A handset 15 including a display unit 14 that outputs image information, a speaker that outputs audio information and a microphone that inputs audio information, a signal processing unit 16 that converts audio information into a signal, and a vibration signal that detects vibration And a memory circuit unit 18 for storing a telephone number and the like.
[0023]
The vibration detector 17 uses a small and light accelerometer or the like, and receives vibration (vibration acceleration) when the user uses the mobile phone 1 while walking, or the user is on a vibrating body such as an automobile. The vibration received sometimes is detected and output to the control circuit unit 2 as a vibration signal.
The vibration detection unit 17 is usually provided in the mobile phone 1.
[0024]
Note that the accelerometer is usually configured to detect vibration in one direction.
For this reason, when an accelerometer is used as the vibration detection unit 17, three accelerometers are arranged so as to detect vibrations in the X-axis, Y-axis, and Z-axis directions.
If it does in this way, the mobile telephone 1 can detect the magnitude | size of a vibration accurately by synthesize | combining the vibration of the said triaxial direction.
[0025]
In addition, the mobile phone device 1 is usually configured to provide three accelerometers, but is not limited to this configuration, and may be configured to provide two or one accelerometer.
By doing so, the components of the mobile phone 1 can be reduced and the structure can be simplified, so that the size and weight can be reduced.
[0026]
The display unit 14 is usually a liquid crystal display.
The display unit 14 receives an image signal from the control circuit unit 2 and displays an image based on the image signal.
Further, the display refresh rate of the display unit 14, the display refresh time interval, the display rewrite rate, and the like are determined by the image signal output from the control circuit unit 2.
[0027]
The image is not limited to a character or graphic image, and may be an image captured by a digital camera or the like.
Further, the image is not limited to a still image, and may be a moving image or a frame advance image.
[0028]
The operation unit 13 is provided with operation keys for operating the mobile phone 1. Although not shown, the operation unit 13 switches from a moving image, a frame advance image, or a still image on the display unit 14 to a different image. A first switch key for switching, a second switch key for switching the frame feed speed, a third switch key for switching the screen refresh speed, and a fourth switch key for switching the time interval of the screen refresh. It is.
[0029]
When the switch keys are pressed, the operation unit 13 outputs a control signal for performing display speed switching corresponding to the switch keys to the control circuit unit 2.
[0030]
For example, when the moving image is displayed when the first switching key is pressed, the control circuit unit 2 switches the moving image to the frame advance image, and when the frame advance image is displayed, The frame advance image is switched to a still image, and when a still image is displayed, the still image is switched to a moving image.
Therefore, when a moving image is displayed, if it is desired to switch to a still image, the moving image can be switched to a still image by pressing the first switching key twice. Further, in a situation where a moving image is not displayed, for example, when a still image is displayed, if the first switching key is pressed twice, it can be switched to a frame advance image.
[0031]
For example, when the second switch key is pressed once, the control circuit unit 2 slows down the frame feed speed of the displayed frame feed image, and the second switch key is pressed twice continuously. Increase the frame feed speed.
[0032]
The control circuit unit 2 slows down the screen refresh rate of the displayed image when the third switch key is pressed once, and refreshes the screen when the third switch key is pressed twice in succession. Increase speed.
[0033]
Furthermore, when the fourth switching key is pressed once, the control circuit unit 2 increases the screen refresh time interval of the displayed image, and when the fourth switching key is pressed twice continuously. Reduce the screen refresh time interval.
[0034]
As described above, when each operation signal is input from each switching key of the operation unit 13, the control circuit unit 2 outputs the image signal for switching the display to the display unit 14 as described above, and performs display switching.
[0035]
Each switching key is not limited to the switching key having the above configuration.
Further, although each switching key is provided separately, the present invention is not limited to this configuration. For example, an operation key that can output four display speed switching operation signals with one operation key may be used.
[0036]
Here, preferably, the control circuit unit 2 that has switched the display speed of the display unit 14 may be configured to return the display speed of the display unit 14 to the state before switching when a predetermined time has elapsed. Accordingly, when the display speed is temporarily switched, the display speed can be automatically restored to the original, and the operability can be improved.
[0037]
In addition, when the vibration detection unit 17 detects vibration while the user is using the mobile phone 1, the mobile phone 1 increases the screen refresh rate of the display unit 14 when the vibration detection unit 17 detects vibration. And / or the time interval for refreshing the screen is switched short.
By doing so, the image quality can be automatically improved when the mobile phone is vibrated .
[0038]
The control circuit unit 2 may be configured to switch the screen refresh rate faster and / or to switch the screen refresh time interval shorter as the input vibration signal is larger.
In this way, the image quality can be improved by a necessary amount according to the magnitude of vibration that the mobile phone receives.
Thereby, for example, even when the user is stationary, walking, or moving on a train or a car, the image quality is improved by a necessary amount according to the vibration state received by the mobile phone 1. Can do.
[0039]
In addition, the mobile phone 1 is configured to restore the screen refresh rate and / or the screen refresh time interval when the control circuit unit 2 stops inputting a vibration signal during use.
In this way, when the mobile phone 1 is not subjected to vibration, the display speed is automatically restored, so that the current consumption can be effectively reduced.
[0040]
As described above, according to the mobile phone 1 of the present embodiment, the user can change the display image, refresh the screen, and the like by operating each switching key.
As a result, when the user wants to prioritize the image quality, the image quality can be improved. When the user wants to prioritize the reduction of the current consumption, the current consumption is reduced by changing the display image. can do.
[0041]
In addition, when the control circuit unit 2 inputs a vibration signal from the vibration detection unit 17 during use, the mobile phone 1 is not adversely affected by vibration by improving the image quality according to the magnitude of the vibration signal. Images can be displayed automatically.
[0042]
Next, a usage example of the mobile phone according to the present embodiment will be described with reference to FIG.
The cellular phone 1 of this usage example is configured to suppress the display refresh rate to reduce current consumption, and normally displays a still image.
That is, since still images have a display rewriting speed slower than that of moving images and frame-by-frame images, current consumption can be reduced.
[0043]
In addition, the mobile phone 1 ensures a certain image quality in a normal use situation, but does not display with an image quality higher than necessary in order to reduce current consumption.
That is, the display unit 14 is an n-line liquid crystal display (referred to as LCD as appropriate), and the screen refresh time t at this time is as shown in FIG.
t = nΔt (Norm) + (n−1) δ (Norm)
It becomes.
Here, Δt (Norm): normal line drawing time δ (Norm): normal retrace time
When the vibration detection unit 17 detects vibration during use, the mobile phone 1 outputs a vibration signal to the control circuit unit 2, and the control circuit unit 2 that has input the vibration signal switches the line drawing time and the retrace time to a short time. The obtained image signal is output to the display unit 14.
That is, the screen refresh time T at this time is as shown in FIG.
T = nΔt (High) + (n−1) δ (High)
It becomes.
Here, Δt (High): High-speed line drawing time δ (High): High-speed retrace time
In addition, the mobile phone 1 of this usage example determines the magnitude of the vibration signal, and when the vibration signal is larger than a predetermined threshold, according to the magnitude of the vibration signal,
Δt (High) <Δt (Norm)
δ (High) << δ (Norm)
T << t
Δt (High) and δ (High) are set so that
By doing so, when the mobile phone 1 receives a large vibration, the screen refresh time is greatly shortened and the image quality is greatly improved.
[0046]
Further, the mobile phone 1 determines the magnitude of the vibration signal, and when the vibration signal is smaller than a predetermined threshold value, according to the magnitude of the vibration signal,
Δt (High) = Δt (Norm)
δ (High) << δ (Norm)
T <t
Δt (High) and δ (High) are set so that
Thus, when the mobile phone 1 receives a small vibration, the screen refresh time is shortened and the image quality is improved according to the magnitude of the vibration .
[0047]
Further, when the first switch key is pressed to switch from a moving image to a frame advance image, or when the frame advance image is switched to a still image, the mobile phone 1 presses the second switch key once to switch the frame advance image. When the frame feed speed of the screen decreases, or when the fourth switching key is pressed once and the time interval of screen refresh of the displayed image becomes long,
trep (Norm) << trep (Low)
Here, trep (Norm): normal screen refresh time interval trep (Low): low speed screen refresh time interval.
By doing so, the number of display rewrites and the number of screen refreshes per unit time are reduced, so that the current consumption can be reduced accordingly.
[0048]
On the other hand, when the first switching key is pressed and the mobile phone 1 switches from a still image to a moving image, the second switching key is pressed twice in succession, and the frame advance speed of the frame advance image increases. Or when the fourth switching key is pressed twice in succession, and the screen refresh time interval of the displayed image is shortened,
trep (High) << trep (Norm)
Here, trep (Norm): normal screen refresh time interval trep (High): high-speed screen refresh time interval.
By doing so, the number of display rewrites and the number of screen refreshes per unit time increase, so that the current consumption increases by that amount, but continuous images can be viewed.
[0049]
【The invention's effect】
As described above, according to the mobile phone device with a vibration detection function according to the present invention, when the user wants to prioritize the image quality, the image quality can be improved and the current consumption can be reduced. When priority is to be given, current consumption can be reduced by changing the display image.
Further, according to the mobile phone device with a vibration detection function according to the present invention, image switching for displaying a moving image, a frame advance image, or a still image being displayed as a different image, a frame advance speed switching of the frame advance image, At least one of screen refresh rate switching and screen refresh time interval switching can be performed.
[0050]
In addition, according to the mobile phone with a display speed switching function according to the present invention, when vibration is applied during use, the screen refresh speed is automatically switched to a high speed according to the vibration and / or the time interval between screen refreshes. The image quality can be automatically improved.
[Brief description of the drawings]
FIG. 1 is a schematic block diagram for explaining a configuration of a main part of a mobile phone with a display speed switching function according to an embodiment of the present invention.
FIG. 2 is a schematic diagram for explaining display refresh of a mobile phone with a display speed switching function according to an example of use of the present invention .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cellular phone 2 Control circuit unit 11 Antenna 12 Radio circuit unit 13 Operation unit 14 Display unit 15 Handset 16 Signal processing unit 17 Vibration detection unit 18 Storage circuit unit

Claims (4)

A mobile phone with a display speed switching function including an operation unit, a vibration detection unit, and a display unit,
A control unit that inputs a vibration signal from the vibration detection unit and controls display speed switching of the display unit based on the vibration signal,
When the vibration detection unit detects a vibration signal during use of the mobile phone, the control unit that has input the vibration signal has a screen refresh rate higher than the screen refresh rate when the vibration signal is not input. And / or switching the screen refresh time interval to be shorter than the screen refresh time interval when the vibration signal is not input.   When the control unit that has input the vibration signal during use stops inputting the vibration signal, the screen refresh rate and / or the time interval of the screen refresh is set to the screen when the vibration signal is not input. 2. The mobile phone with a display speed switching function according to claim 1, wherein the refresh time and / or the screen refresh time interval when the vibration signal is not input are restored.   As the input vibration signal is larger, the screen refresh rate is switched to a higher speed than the screen refresh rate when the vibration signal is not input, and / or the time interval of the screen refresh is changed to the vibration signal. The mobile phone with a display speed switching function according to claim 1 or 2, wherein switching is further made shorter than the time interval of the screen refresh when no input is made.   A switching key for switching images is provided, and when the switching key is pressed, a moving image, a frame advance image, or a still image that is being displayed is sequentially switched and displayed. A mobile phone with a display speed switching function according to one item.

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