JPH11242465A - Picture display device and picture display control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the power consumption of a display device lower by performing the applying of a prescribed display data voltage in either period of periods equivalent to N pieces of 0 piece being in one horizontal period and performing an (N+1)- gradation display with a split pulse width modulation to enable displaying of multilevel assigning intensity levels while driving a display device with only a driving IC incorporated with a line memory whose cost is inexpensive. SOLUTION: At the time of performing an (N+1)-gradation display while dividing one horizontal period into N pieces, however the applying of a data voltage is performed by the repeatation of an HI and an LO in the conventional device, in contrast to this way, the applying of the data voltage is performed by the repeatation of the HI, the LO, the LO and the HI in this display device. Consequently, the sign of a voltage difference is inverted (multi-common-inverted) every common electrodes of two lines without inverting (one-common-inverting) the sign of the voltage difference every common electrode of one line. As a result, it is made possible to reduce a frequency and to reduce power consumption of the device in accordance with this way and also the picture quality is made satisfactory by making a shadow wing to be hardy generated while suppressing the voltage reduction of resistance electrodes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an image display device for displaying an image of a character or the like appearing in a game, and a method for controlling image display.

[0002]

2. Description of the Related Art Generally, an image display device, for example, a game device, has a liquid crystal display device for displaying an image according to the progress of a game to a game player.

In this liquid crystal display device, a plurality of image data stored in a memory in advance are sequentially displayed as an image in response to an input from a game player or the like while a game program is in progress, so that the image moves. (That is, a moving image).

[0004] The liquid crystal display device has a structure having two glass plates sandwiching a liquid crystal. On the inner surface of this glass plate, linear electrodes made of ITO or the like are provided in a row. In the two glass plates, these electrodes are arranged in a matrix in plan view (vertical lines are display data electrodes, horizontal lines are common data lines). (Referred to as electrodes). The point where the electrode lines intersect in plan view and the surrounding area are called a liquid crystal cell.

In order to display image data on a liquid crystal display device, control means such as a driving IC dedicated to liquid crystal display is required. First, the control means temporarily stores the image data sequentially sent in series from the image circuit for one screen (one frame). Thereafter, the image data is collectively stored for one common electrode (corresponding to one horizontal liquid crystal cell of the liquid crystal display device) in the form of a line. The display data voltage is applied simultaneously for one common electrode.
The same method is applied to the image data of the next and subsequent screens, and by repeating this at a high speed, the image is displayed on the liquid crystal display device as if it were moving.

[0006] The liquid crystal molecules in the liquid crystal change to be in a stable posture due to the difference between the display data voltage and the common voltage. Since the amount of light transmitted through the liquid crystal display device changes in accordance with the change in the posture, a certain portion is bright, and
Some parts will be displayed dark. Therefore, the liquid crystal display displays an image with light and dark according to the orientation of the liquid crystal molecules.

[0007]

In the above-described image display device, the control means of the liquid crystal display temporarily stores the image data in a frame shape (for one screen) and sequentially sends the image data to the liquid crystal display device. While a control method with a very high data transfer speed is performed, the circuit configuration becomes very complicated and the cost becomes high.

In recent years, the size and cost of image display devices, such as portable game machines, have been extremely reduced, and accordingly, the circuit configuration is simple and the cost is low. What uses control means is desired. Also, for example, portable devices such as portable game machines often use dry batteries or button batteries as a power source, and perform liquid crystal display in order to minimize the trouble of replacing batteries and cost increase due to battery purchase as much as possible. Even if
There is a demand for image display control that consumes as little power as possible.

An object of the present invention is to provide an image display device and an image display control method which can solve the above problems.

[0010]

According to a first aspect of the present invention, a game program for advancing a game, a plurality of image data and a plurality of sound data are stored in a memory in advance, and the plurality of image data are stored in accordance with the progress of the game. An image display device for sequentially transferring appropriate image data to a liquid crystal display device and displaying the image as if it were moving on the liquid crystal display device, wherein the liquid crystal display device for displaying the image and the game player A key input unit for operating in accordance with the progress, and control means for sequentially transferring the plurality of image data to the liquid crystal display device. The control means sequentially selects a plurality of common electrodes one by one, and A common electrode driving circuit for applying a predetermined common voltage to the selected common electrode; and a display data electrode corresponding to each of the divided periods by dividing one horizontal period into N periods. And a data electrode driving circuit for applying a predetermined display data voltage to any one of 0 to N periods in one horizontal period. The present invention provides an image display device characterized in that display of (N + 1) gradation is performed by divided pulse width modulation.

According to a second aspect of the present invention, there is provided a liquid crystal display device for displaying an image, and control means for sequentially transferring the plurality of image data to the liquid crystal display device, wherein the control means sequentially connects the plurality of common electrodes. A common electrode driving circuit that selects one by one and applies a predetermined common voltage to the selected common electrode; and a display data voltage corresponding to each of the divided periods by dividing one horizontal period into N periods. An image display device having a data electrode driving circuit for applying an electrode, wherein the liquid crystal display device applies a predetermined display data voltage to any one of 0 to N periods in one horizontal period. At a timing that is continuous with one of the horizontal periods before and after, and (N +
1) To provide an image display device characterized by performing gradation display.

According to a third aspect of the present invention, appropriate image data of a plurality of image data is sequentially transferred to a liquid crystal display device, and a plurality of common electrodes are sequentially transferred one by one based on the transferred image data. A predetermined common voltage is applied to the selected common electrode, one horizontal period is divided into N periods, and a display data voltage corresponding to the divided period is applied to the display data electrode according to the application of the common voltage. The present invention relates to a method of controlling an image display in which a display is applied and (N + 1) gradations are displayed by divided pulse width modulation, wherein a predetermined display data voltage is set to any one of 0 to N periods in one horizontal period. The present invention provides a method of controlling image display, characterized in that application is performed in such a period at a timing continuous with the preceding and following horizontal periods.

In the present invention, one horizontal period refers to a time during which a common voltage is applied to one common electrode.

Further, in the present invention, the larger the number (N) of dividing one horizontal period, the more multi-gradation display can be performed. The division of one horizontal period is not limited to an equal one. Note that N is an integer of 2 or more.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present embodiment will be described with reference to the drawings, taking a portable game machine as an example of an image display device, but the present invention is not limited to this.

FIG. 1 is a functional block diagram showing functions of the portable game machine according to the present embodiment.

In this portable game machine 2, a game player performs a key input according to the progress of a game program to play a game.
Is electrically connected to the memory cartridge 1 storing the
The game program 3b of the memory cartridge 1 is advanced.

The memory cartridge 1 includes a memory 3 in which a game program 3b, a plurality of image data 3a, and a plurality of sound data 3c are stored in advance.

The portable game machine 2 has a game program 3
b, and the image data 3a stored in the memory 3.
Liquid crystal display device 5 for displaying a sound as an image, and sound data 3
c, a sound reproducing unit 6 for reproducing a sound as a sound, a key input unit 7 for inputting a player's own intention, and a command for advancing the game program 3b in the memory 3. In response to a key input of the game player via the game player 7, the appropriate image data 3a of the plurality of image data 3a is transferred to the liquid crystal display device 5, and the appropriate sound data 3c of the plurality of sound data 3c is converted to sound. A battery (power supply) (not shown) having a function including a CPU 8 for transferring the data to the reproduction unit 6 and activating these functions.
It has.

Next, the details of the liquid crystal display device 5 will be described.

FIG. 2 is a functional block diagram showing functions of the liquid crystal display device 5 in the present embodiment.

The liquid crystal display device 5 has a liquid crystal display panel for displaying an image. Reference numeral 11 denotes a liquid crystal display panel.
The liquid crystal display panel 11 includes two glass plates (not shown) sandwiching a liquid crystal. On the inner surface of one of the glass plates, a plurality of display data electrodes X (X1
To Xi) are arranged in a row, and a plurality of common electrodes Y (Y1 to Yi) extending in the lateral direction are arranged in a row on the other inner surface. The two glass plates are adhered so that the electrodes X and Y form a matrix when viewed in plan, and the intersection of the electrodes X and Y forms one liquid crystal cell A. In the liquid crystal cell A, the liquid crystal molecules in the liquid crystal are changed to a desired posture by changing the difference between the voltages applied to the electrodes X and Y, and a reflecting plate (not shown) behind the liquid crystal display panel is used.
And the amount of external light (display luminance) that is reflected by the liquid crystal panel and transmitted through the liquid crystal display panel.

The display data electrode X is electrically connected in series with the display data control circuit 14 and the data electrode drive circuit 15.

The display data control circuit 14 sequentially transfers the image data 3a transferred from the portable game machine 2 to the data electrode drive circuit 15 as display data (for displaying an image on the liquid crystal display panel 11). .

In the data electrode drive circuit 15, the display data in the display data control circuit 14 is transferred to each display data electrode (X
1 to Xi), and can be simultaneously loaded in parallel to each display data electrode (X1 to Xi) when one row of the common electrode Y described later is accumulated. Further, the data electrode drive circuit 15 is electrically connected to the voltage generation circuit 16. The voltage generation circuit 16 applies a display data voltage (either the display ON voltage or the display OFF voltage) corresponding to the display data to the display data electrode X. The application of the display data voltage can be performed for each column of the common electrode Y (Y1 to Yi).

A common electrode drive circuit 17 is individually and electrically connected to each of the common electrodes (Y1 to Yi), and a voltage generation circuit is provided in accordance with the timing at which the display data voltage is applied to the display data electrode X. A common voltage generated from 16 is applied to each column of the common electrode Y. The application timing of the display data voltage and the common voltage is determined by the timing signal generation circuit 18.

Next, a control method for displaying an image on the liquid crystal display panel 11 will be described.

FIG. 3 is a flowchart showing a flow for driving the liquid crystal display device.

First, the image data 3a is transferred to the display data control circuit 14 according to the instruction of the CPU 8 in accordance with the progress of the game program 3b. Transferred image data 3a
Are the display data electrodes X in the display data control circuit 14.
The data is sequentially stored in the storage table 14a (for one column of common electrodes) corresponding to (X1 to Xi), and becomes a line memory.
Two storage tables 14a are provided, and two
It is possible to have a line memory for the common electrodes Y in the column (for example, Y1 and Y2).

After all the line memories in the first column are stored in one storage table 14a1, the line memories in the second column are stored in the other storage table 14a2. At this time, the line memories of the first column already stored in one storage table 14a1 are sequentially transferred to the data electrode drive circuit 15 in series. When all the line memories in the first column are transferred to the data electrode drive circuit 15,
Next, the line memory of the second column stored in the other storage table 14a2 is transferred to the data electrode drive circuit 15.
At the same time, the third line memory is stored in one storage table 14a1. Such an operation is repeatedly performed.

Next, the line memory of the first column transferred to the data electrode driving circuit 15 stores each display data electrode X (X1
To Xi), a plurality of latch tables 15a corresponding to
Are sequentially and serially stored as display data. After all the display data in the first column is stored in each latch table 15a, it is loaded onto each display data electrode X at once in parallel with the output timing of the clock signal from the timing signal generation circuit 18. You. The loading of the display data electrode X is performed by applying a display data voltage corresponding to the display data generated from the voltage generation circuit 16 to the display data electrode X. At this time, a predetermined common voltage is applied to the common electrode Y1 in the first column in accordance with the output timing of the clock signal. Note that a common voltage having a value different from the predetermined common voltage is applied to the common electrodes (Y2 to Yi) in the other columns.

The application of the display data voltage to the display data electrodes X is sequentially performed at high speed for each row of the common electrodes Y to which a predetermined common voltage is applied. Again to the first row common electrode Y1,
This is repeated. As a result, the image display is continuously changed for each screen, and the image is displayed as if it were moving.

FIG. 4 shows an example of a waveform of a voltage applied to one liquid crystal cell A of the liquid crystal display panel 11 during one horizontal period C.

The one horizontal period refers to a time during which a display data voltage is applied to one liquid crystal cell when a common voltage is applied to one common electrode (for example, Y1).

In this embodiment, one horizontal period C is substantially equally divided into three, and a display data voltage corresponding to each divided period is applied to the display data electrode X. That is, the display data voltage is applied three times during one horizontal period C.

In the present embodiment, one horizontal period is substantially equally divided into three. However, the present invention is not limited to this. The number of divisions is not limited to three and may be two or more.
The length of each divided period is changed without equally dividing one horizontal period (for example, one horizontal period C is changed to 0.15C, 0.3
C and 0.55C).

Since the display data voltage can be applied three times during one horizontal period C, for example, even when display data consisting of 2 bits is used, the predetermined display data voltage is applied to one horizontal period C. By selecting the number of times of application among 0 times, 1 time, 2 times and 3 times, four types of effective voltage values can be obtained, and display of four gradations can be performed accordingly. Becomes

That is, for example, the display data voltage value is
As two types, HI (10 V) and LO (8 V), ON display is performed when HI is applied three times (a), HI is displayed twice, and ／ is displayed when LO is applied once (b) (b) 1/3 display (c) when HI is applied once and LO is applied twice
The OFF display (d) can be performed when the LO is applied all three times, and a total of four types of display, that is, four gradation display can be performed.

Also, if each divided period in one horizontal period is made unequal and divided into N, 2N power gray scale display is possible.

As described above, in this embodiment, one horizontal period is divided into a plurality of periods, and the timing signal generation circuit 18
The multi-gradation display is performed by selecting and applying the display data voltage in each divided period in accordance with the clock signal from.

Therefore, according to the image display device of the present invention,
While using a control IC (control means) having a simple and low-cost line memory type circuit configuration,
Multi-gradation display can be performed.

In particular, in a portable game machine, it is desired that the circuit configuration be simplified and the cost be reduced. However, this embodiment uses a low-cost line memory type control means. In addition, it is possible to perform multi-tone display with clear display.

Further, the liquid crystal molecules in the liquid crystal do not change their posture immediately after the voltage is applied, but their posture is stabilized after a certain period of time. It is preferable that the timing of the operation be slightly earlier than the output timing of the clock signal.

Here, a method of applying a voltage to liquid crystal molecules will be described in detail.

The orientation of the liquid crystal molecules changes due to a total voltage difference (hereinafter referred to as an effective voltage value) over a certain period of time.

FIG. 5 shows the relationship between the movement of liquid crystal molecules (vertical axis) and the effective voltage value (horizontal axis). In FIG. 5, S ′,
S ″ is a different stable posture state.

As shown in FIG. 5, the liquid crystal molecules do not move in a stable posture when the effective voltage value is low, and start moving toward another stable state when the effective voltage value reaches a certain value (V1). When a certain effective value (V2) is reached, another stable state is set.

However, if the electric field having the same voltage difference is continuously applied for a long time, the liquid crystal molecules are decomposed into two poles and do not move as intended. Moreover, the movement of the liquid crystal molecules is determined by the effective voltage value regardless of whether the sign of the applied voltage difference is positive or negative. Therefore, an AC voltage is used as an applied voltage when performing liquid crystal display.

Next, voltage application in conventional liquid crystal display control will be described in order to clarify comparison with the present invention.

That is, conventionally, first, the common electrode Y
1 is a selection line, a predetermined common voltage 0V is applied to the common electrode Y1, and at the same time, the other common electrodes (Y2 to Yi) are non-selected lines and a voltage of 9V is applied to the other common electrodes (Y2 to Yi). Is applied.

The power consumption for liquid crystal display is determined by the product of the capacitance of the capacitor, the square of the effective voltage of the voltage, the frequency, and １ ／, assuming that the portion between the two glass plates in the liquid crystal display panel is the capacitor portion. Is done. As described above, the magnitude of the effective voltage value has a large effect on the power consumption. For example, an electric field having a small voltage difference during a non-selected line is more effective than applying an electric field having a high voltage difference only during a selected line. In this case, the power consumption can be considerably reduced, so that an electric field having a voltage difference is applied to each liquid crystal cell on a non-selected line.

A predetermined display data voltage of 10 V is applied to the display data electrode X2 in accordance with the application of the common voltage to the common electrode Y.
Is applied. The other display data voltage of 8 V is applied to each of the display data electrodes (X1, X3 to Xi). FIG. 6A shows a voltage difference applied to each liquid crystal cell at this time.

Next, a predetermined common voltage of 10 V is applied to the common electrode Y2, and at the same time, the other common electrodes (Y
1. A common voltage of 1 V is applied to Y3 to Yi). At the same time, a predetermined display data voltage 0V is applied to the display data electrode X2. The other display data voltage of 2 V is applied to each of the display data electrodes (X1, X3 to Xi).
FIG. 6B shows the voltage difference between the liquid crystal cells at this time.

Further, a voltage of 0 V is applied to the common electrode Y3, and at the same time, the common electrodes (Y1, Y2, Y4 to Y4) are applied.
A voltage of 9 V is applied to i). At the same time, display data electrode X
3. Apply a predetermined display data voltage of 10 V to Xi. Other display data voltages of 8 V are applied to the display data electrodes X1 and X2. FIG. 6C shows a voltage difference between the liquid crystal cells at this time.

According to the above-described procedure, the common electrodes Y4 and Y5 (not shown) as selection lines are used.
And select. FIG. 6D shows a voltage difference between the liquid crystal cells when the common electrode Yi is selected as a selection line.

As shown in FIG. 6, predetermined display data voltages 10 V and 0 V are alternately applied to desired display data electrodes X each time the selection line of the common electrode Y changes, and display data is applied to other display data electrodes. Voltages of 8 V and 2 V are applied alternately.

Further, the desired common voltages 0 V and 10 V are
Each time the selection line of the common electrode Y changes, the common voltage is applied to a desired common electrode Y, and the common voltages 9V and 1V are alternately applied to the common electrode Y of the non-selection line.

In each liquid crystal cell, the minimum voltage difference is 1 V and the maximum voltage difference is 10 V, which indicates that the bias ratio is 1:10.

In the present invention, as described above, one horizontal period is divided into N and the display data voltage H of each divided period is divided.
I, LOW (for example, when a predetermined display data voltage is 10 V,
When other display data voltage is 8V, HI is 10
V, LOW is 8V), (N + 1)
Perform gradation display.

FIG. 7A shows the display data electrode X in FIG.
2 shows a conventional display data voltage application state during one horizontal period for a liquid crystal cell where the common electrode Y3 intersects;
FIG. 7B is an explanatory diagram for explaining a change in a conventional voltage difference.

In FIG. 7A, the vertical axis represents the display data voltage (HI, LO) V, and the horizontal axis represents time T.
In (b), the vertical axis represents the voltage difference E, and the horizontal axis represents the time T.

However, conventionally, as can be seen from FIG. 7 (a), when the (N + 1) gradation display is performed, the display data voltage is HI and LOW, and the voltage applied to the liquid crystal cell in the non-selected line. The sign of the voltage difference changes. When the sign of the voltage difference changes in this manner, the frequency increases, so that the power consumption becomes extremely large.In addition, the shadow wing due to the drop of the effective voltage value due to the voltage drop of the electrode resistance during charging and discharging of the liquid crystal cell. Or the contrast ratio is reduced, and the image quality is likely to be degraded.

In terms of power consumption, especially in the case of a portable game machine in which the game device uses a battery as a power supply, the battery must be replaced frequently, which is very troublesome. I do.

Therefore, in the present invention, the following voltage is applied when one horizontal period is divided into N and (N + 1) gradation display is performed. FIG. 8 shows an embodiment of the present invention.
It is explanatory drawing for demonstrating the comparison with (a) and FIG.7 (b).

That is, conventionally, the data voltages are set to HI, L
In the present invention, HI,
The display data voltage is applied by repeating LO, LO, and HI.

Thus, the sign of the voltage difference is inverted for each common electrode of two lines (multi-common inversion) without inverting the sign of the voltage difference for each common electrode of one line (one common inversion).
Let them do it. As a result, the frequency is reduced, and accordingly, it is possible to reduce the power consumption. In addition, the voltage drop of the resistance electrode described above is suppressed, so that shadow wing is hardly generated, and the image quality is improved. Becomes possible.

Further, in the present invention, by increasing the bias ratio because of low power consumption, it is possible to increase the contrast ratio in addition to the good image quality, and to provide even better image quality.

In the present embodiment, a virtual common electrode is provided also in a region (blank region) other than the display region in the liquid crystal display panel. When the common electrode in the blank area is used as the selection line (blanking period), the display electrode voltage for the next screen is prepared by the data electrode circuit, and the smooth data transfer process is performed. The voltage consumption is suppressed by setting the effective voltage value of the liquid crystal cell on the electrode to 0 and lowering the frequency. Also,
In the present embodiment, the sign of the voltage difference is inverted for each of the two lines of the common electrode. However, the present invention is not limited to this. The common inversion of a plurality of lines may be performed.

Next, the structure of the portable game machine according to the present embodiment will be described.

FIG. 9 is a plan view showing a portable game machine used in the present embodiment, and FIG. 10 is a lower end view showing the portable game machine used in the present embodiment.

This portable game machine has a case body 21 for storing the various functions described above. A liquid crystal display panel 11 for displaying an image in accordance with the progress of the game to the game player is provided substantially at the center of the surface of the case body 21 in the longitudinal direction. The liquid crystal display panel 11 is disposed so as to be located slightly above a center line C (indicated by a dashed line in the figure) in the short direction of the case body 21.

Further, on both left and right sides of the liquid crystal display panel 11, key input units 7 for the game player to input his / her own intention are provided. The key input unit 7 includes a controller 7a located on the left side of the liquid crystal display panel 11, two push buttons 7b located on the right side, and a push button 7b.
And a start / pause key 7c located on the upper side.
The controller 7a has four pressing points at the top, bottom, left and right. The controller 7a and the push button 7b (the center positions of the two push buttons) (the three-dot chain line D in the figure) are disposed slightly above the center line C of the liquid crystal display panel 11. Moreover, the controller 7a and the push button 7b are arranged substantially symmetrically with the liquid crystal display panel 11 interposed therebetween. Thus, when the game player holds the left and right palms in contact with both side surfaces of the case body 21, the belly of the thumb on both sides is located in the key input section 7, and the key operation becomes extremely easy. Become. As described above, the liquid crystal display panel 11 is disposed at a substantially central portion of the surface of the case body 21 in the longitudinal direction. However, since the liquid crystal display panel 11 is disposed at a position slightly closer to the controller 7a (that is, a position deviated leftward), The surface of the case body 21 is formed such that the area near the push button 7b side is larger than that on the controller 7a side. The game player is 2
The game may be advanced by arbitrarily selecting an appropriate one of the three push buttons 7b at a relatively high speed. In order to operate the two push buttons 7b alternately at such a high speed, the push buttons 7b
The operability can be improved by increasing the area of the vicinity and increasing the distance between the push buttons 7b to some extent. On the other hand, if the distance between the push buttons 7b is too small, the operability will deteriorate.

Further, a power switch 2 which can be manually operated by the game player is provided above the controller 7a.
2 are provided. When the game player keeps pressing the game player for a certain period of time (for example, two seconds), the power switch 22
N operation is set. Thereby, even if the game player accidentally presses the power switch 22 momentarily, the power is not turned on, and wasteful power consumption can be prevented. Further, on the right side of the power switch 22,
A light emitting device 40 composed of an LED device or the like is provided.
Thus, for example, in the liquid crystal display panel 11, even if the contrast volume of the liquid crystal display panel 11, which will be described later, is the darkest and the image is hardly visible, the game player can turn on the power switch 22.
The power switch 2
It is less likely that the power supply is continuously turned on and the power supply is wasted without knowing the operation state of the power supply.

Further, a plurality of slots 24 are provided below the controller 7a so that the sound from the speaker 6a can be easily heard by the game player.

The following functions are provided inside the case body 21.

On the back side of the push button 7b, two AA dry batteries (power supply) 22a as power supplies are arranged in parallel. A substantially circular and thin auxiliary battery (power supply) 22b is provided on the back side of the speaker 6a. This auxiliary battery 22b
Although not shown in the functional block diagram of FIG. 1, a clock display circuit and a memo storage circuit provided in the portable game machine 2 are provided to always operate regardless of the ON operation of the power switch 22. Have been. The clock display circuit is provided, for example, for the purpose of displaying Japan time or displaying time in various parts of the world. The memo storage circuit is provided for the purpose of, for example, making a memo of a work or a private business not related to the game by key input, storing the memo, and displaying it when desired. In recent years, it is often desired that electronic devices have many functions. On the other hand, there has not been a game device including the above-described functions, and the game device according to the present embodiment plays a game or uses the above-described functions according to the situation, and determines how to use the game device itself. Can be determined each time.

The following functions are provided inside the case body 21 and on the lower end surface thereof. First, from the left side, a volume control 27 for changing the volume reproduced from the speaker 6a, and the dry cell 22a in the case body 21
And an external power supply adapter 28 for taking in power from an external source other than the auxiliary battery 22b, the earphone adapter 2
9 and a display volume 30 for changing the density of an image displayed on the liquid crystal display panel 2. The volume volume 27 and the display volume 30 can be changed by a manual operation of the game player.

Further, since there is no function on the both sides of the case body 21 that can be manually operated by the game player, when the game player holds the game with both the left and right hands, for example, the hand may be displayed erroneously. It is possible to prevent the image on the liquid crystal display panel 11 from being completely invisible due to contact with the volume 30 for the game, and the game can be favorably advanced.

Although not shown, an insertion port for inserting the memory cartridge 1 is formed in the upper end surface of the case body 21 at a substantially central portion in the longitudinal direction. A connector for electrically connecting to the memory cartridge 1 is provided at the back of the insertion slot.

An adapter 31 for electrically connecting to another game device (for example, for a wireless unit for electrically connecting to a wireless unit) is provided on the left side of the upper end surface of the case body 21. Have been.

In this embodiment, a portable game machine is used as a game device. However, the present invention is not limited to this, and any game device having a liquid crystal display device may be used. This is effective for the game device that has been used.

[0082]

According to the first aspect of the present invention, cost reduction can be achieved without using a drive IC having a built-in frame memory for transferring one image data to be displayed on the screen of the liquid crystal display device at one time. An image display device capable of performing multi-gradation display can be provided by driving only with a drive IC having a built-in inexpensive line memory.

According to the second aspect of the present invention, the frequency is reduced, the power consumption can be reduced accordingly, and the above-mentioned voltage drop of the resistance electrode is suppressed to make shadow wing less likely to occur. An image display device capable of improving image quality can be provided.

According to the third aspect of the present invention, it is possible to lower the frequency, thereby lowering the power consumption, and to suppress the voltage drop of the above-described resistance electrode to make shadow wing less likely to occur. An image display control method capable of improving image quality can be provided.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing functions of a portable game machine according to the present embodiment.

FIG. 2 is a functional block diagram illustrating functions of the liquid crystal display device in the present embodiment.

FIG. 3 is a flowchart illustrating a flow of driving a liquid crystal display device.

FIG. 4 is an explanatory diagram illustrating an example of a waveform of a voltage applied to a certain liquid crystal cell of a liquid crystal display panel during one horizontal period.

FIG. 5 is an explanatory diagram for explaining a relationship between movement of liquid crystal molecules and an effective voltage value.

FIG. 6 is an explanatory diagram for describing a change in an effective voltage value applied to each liquid crystal cell in the present embodiment.

FIG. 7 is an explanatory diagram for describing a data voltage application state within one horizontal period in a certain liquid crystal cell on a selected line and a certain liquid crystal cell on a non-selected line.

FIG. 8 shows a data electrode X in which HI is selected as a data voltage.
FIG. 4 is an explanatory diagram illustrating a voltage application state in each of the above liquid crystal cells.

FIG. 9 is a plan view showing a portable game machine used in the present embodiment.

FIG. 10 is a bottom view showing the portable game machine used in the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Memory cartridge 2 Portable game machine 3 Memory 3a Game program 3b Image data 5 Liquid crystal display device 7 Key input section 8 CPU 11 Liquid crystal display panel 14 Display data control circuit 15 Data electrode drive circuit 17 Common electrode drive circuit 18 Timing signal generation circuit X Display data electrode Y Common electrode SNC Corporation

Claims (3)

[Claims] 1. A game program for playing a game,
Appropriate image data of the plurality of image data is sequentially transferred to a liquid crystal display device in accordance with the progress of the game from a memory in which a plurality of image data and sound data are stored in advance, and the image is moved by the liquid crystal display device. An image display device for displaying an image, a liquid crystal display device for displaying an image, a key input unit for a game player to operate according to the progress of the game, and the liquid crystal display device for displaying the plurality of image data. Control means for sequentially transferring the plurality of common electrodes one by one, and applying a predetermined common voltage to the selected common electrodes. And a data electrode driving circuit for applying a display data voltage corresponding to each of the divided periods to a display data electrode. Is applied to any one period of zero to the period of N content in one horizontal period display data voltage, an image display apparatus, characterized in that the display of (N + 1) gradations. 2. A liquid crystal display device for displaying an image, and control means for sequentially transferring the plurality of image data to the liquid crystal display device, wherein the control means sequentially selects a plurality of common electrodes one by one. A common electrode driving circuit for applying a predetermined common voltage to the selected common electrode, and data for dividing one horizontal period into N periods and applying a display data voltage corresponding to each of the divided periods to the display data electrode. An image display device having an electrode driving circuit, wherein the liquid crystal display device is configured to apply a predetermined display data voltage to a horizontal period before or after any one of 0 to N periods in one horizontal period. An image display device that applies the voltage at a timing that is continuous with any one of the above to display (N + 1) gradations. 3. Appropriate image data among a plurality of image data is sequentially transferred to a liquid crystal display device, and a plurality of common electrodes are sequentially selected one by one based on the transferred image data. A predetermined common voltage is applied to the common electrode, one horizontal period is divided into N periods, and a display data voltage corresponding to the divided period is applied to the display data electrode according to the application of the common voltage, and (N + 1) A) a method of controlling image display for displaying gray scales, wherein a predetermined display data voltage is connected to a horizontal period immediately before or after any one of 0 to N periods in one horizontal period. A method for controlling image display, characterized in that application is performed at a timing when the image is displayed.