JPH04153690A - Applied voltage adjustment device for liquid crystal display device - Google Patents

Abstract

PURPOSE:To easily confirm display characters on a liquid crystal display device (LCD) even after the rotation of the LCD by varying the applied voltage of the LCD according to the angle of rotation of the LCD and varying the view angle of the LCD toward an operator. CONSTITUTION:The liquid crystal display device (LCD) 11 is fitted on a base 13 by determining the view angle of the LCD 11 when a reference voltage is applied so that the sight of the operator enters a view angle range determined by the above view angle. When the LCD 11 rotates from its reference position, the angle of rotation of the LCD 11 is detected by a rotational angle detection part 15. A voltage control part 16 adjusts the applied voltage according to the detection data so that the view angle of the LCD 11 after the rotation varies from the view angle when the reference voltage is applied in the opposite direction from the rotating direction of the LCD 11. Namely, the view angle of the LCD 11 after the rotation is varied toward the operator as compared with the view angle when the reference voltage is applied. Consequently, the display characters on the LCD 11 can easily be confirmed.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION (Industrial Field of Application) The present invention relates to an applied voltage adjustment device in a liquid crystal display whose viewing angle changes depending on the applied voltage.

(Prior Art) In a standard liquid crystal display (hereinafter referred to as LCD), a predetermined range based on the viewing angle at which the contrast is maximum is the character confirmation range when the displayed characters are lit (hereinafter referred to as viewing angle range). The viewing angle changes depending on the value of the liquid crystal drive voltage.Therefore, conventionally, when attaching an LCDI to an input device, etc., the LCDI is rotatably attached to the device body, and the liquid crystal drive voltage is set to a predetermined value. The viewing angle θ is set to a fixed value, and the direction of the LCDI is adjusted so that the operator's line of sight falls within a predetermined viewing angle range θ determined by the viewing angle θ (FIG. 5).

However, according to the conventional mounting structure, when the operator is performing an input operation, the LCDI rotates as shown by the one-dot g line in Figure 5 due to vibration or other causes, and the operator's line of sight shifts from one point to another within the viewing angle range θ. In such cases, the operator must stop inputting work and switch back to the LCD screen.
A problem occurred in that the orientation of the image had to be adjusted.

In addition, in a laptop computer as shown in FIG. 6, the viewing angle φ. The orientation of the LCD 2 can be adjusted by rotating the LCD 2 so that the line of sight falls within the viewing angle range φ determined by When the LCD 2 is rotated as shown in , the line of sight may deviate from the viewing angle range φ, making it difficult to confirm the displayed characters.

(Problems to be Solved by the Invention) As described above, in the above LCD mounting structure, if the orientation of the LCD changes due to vibration etc. after adjusting the orientation of the LCD so that the operator can easily check the displayed characters, the operator There was a problem in that the operator's line of sight was out of the viewing angle range, making it difficult for the operator to confirm the displayed characters.

The present invention has been made in view of such conventional drawbacks, and even after the operator adjusts the orientation of the LCD so that the displayed characters can be easily seen, the operator's line of sight still deviates from the viewing angle range even if the orientation of the LCD changes. It is an object of the present invention to provide an applied voltage adjustment device for a liquid crystal display device that allows easy confirmation of characters displayed on an LCD without causing any problems.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a liquid crystal display that is rotatably attached to a base and that changes the viewing angle to obtain maximum contrast depending on the applied voltage. In an applied voltage adjustment device for a liquid crystal display that adjusts the applied voltage in the display, the device is positioned on the base so that the viewing angle points in a predetermined direction when a voltage of a reference voltage value is applied. a rotation angle detection unit that detects a rotation angle of the liquid crystal display from the reference position using the liquid crystal display as a reference position; and a rotation angle detection unit that detects a rotation angle of the liquid crystal display from the reference position; Voltage control that adjusts the magnitude of the applied voltage and tilts the viewing angle of the liquid crystal display after rotation by a predetermined angle in a direction opposite to the rotational direction of the liquid crystal display with respect to the viewing angle when the reference voltage is applied. The structure includes a section.

(Function) In the present invention, the viewing angle direction of the liquid crystal display (LCD) when a reference voltage value is applied is determined so that the operator's line of sight falls within the viewing angle range determined by this viewing angle, and the LCD is used as a base. When installed, when the LCD rotates from its reference position, the rotation angle of this LCD is detected by the rotation angle detection section, and according to that data, the voltage control section adjusts the viewing angle of the rotated LCD to the reference voltage. Since the applied voltage is adjusted so that the viewing angle is tilted in the opposite direction to the rotational direction of the LCD with respect to the viewing angle when the voltage is applied, the viewing angle of the LCD after time 1# is tilted toward the operator compared to when the reference voltage is applied. It will be done.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to FIGS. 1 to 3.

Figure 1 is a block diagram of the applied voltage adjustment device, Figure 2 is a perspective view of the input device equipped with an LCD, and Figure 3 is the LCD.
FIG. 3 is an explanatory diagram showing the relationship between the voltage applied to the viewing angle and the viewing angle.

In these figures, 10 is an input device, and 11 is a liquid crystal display attached to a housing (base) 13 of the input device 10.
LCD).

The LCD II is attached to the base 13 via the rotating part 14, and is rotatable in the direction of the arrow shown in FIGS. 1 and 2. Further, this LCD 11 has V as a reference voltage value. The configuration is such that a power supply voltage of V is applied, as shown in FIG.

The LCD 1 is adjusted so that the operator's line of sight falls within the viewing angle range θ determined by the viewing angle θ0 of the LCD II when
1 is facing toward the LCD II, and the position of the LCD 11 at this time is the reference position of the LCD II on the base 13.

15 is a rotation angle detection section, 16 is a power supply voltage control section,
These constitute an applied voltage adjustment device.

The rotation angle detection unit 15 may cause the LCD to
L relative to the reference position of LCD II when II rotates
Detects the rotation angle of CDII.

The power supply voltage control section 16 adjusts the voltage value of the power supply supplied from the liquid crystal drive circuit power supply 17 according to the rotation angle data detected by the rotation angle detection section 15 and outputs it to the LCD 11 . The voltage value of the power supply output from the power supply voltage control unit 16 to the LCD 11 is the reference voltage ■ when the LCD II is at the reference position. It is said that Furthermore, when the LCD II is rotated, for example, as shown in FIG. 3, when the LCD 11 is rotated by a certain amount in the direction of the arrow α, the viewing angle θ1 of the LCD 11 is in the opposite direction to the arrow α (in the direction of the arrow α1) with respect to the viewing angle θ0. A voltage value V1 is outputted from the power supply voltage control section 16 so as to be inclined to . The value of this voltage value (1) is determined by the characteristics of the LCD 11, and is the reference voltage value V. If the viewing angle θ1 of the LCD II is tilted in the α1 direction when it is made larger than , then Vl is V. In the opposite case, it is made smaller. Further, as for the value of (1), although it depends on the characteristics of the LCD 11, it is desirable that the viewing angle θ1 of the LCD II after rotation coincides with the viewing angle θ0 of the LCD 11 at the reference position.

Various mechanisms are conceivable for the rotation angle detection section 15 and the power supply voltage control section 16, but for example, an operating section of a shaft-rotating variable resistor is linked with the rotation shaft of the LCD 11, and the LC
LCDII by converting the rotation angle of DII into an increase/decrease in resistance value.
A conceivable configuration is to adjust the voltage value of the power supply output to the

Next, the operation of the above device will be explained.

LCDII usually has a reference voltage value V. is applied, LC
Visual angle θ of D11. The LCD 11 is directed toward the operator so that the operator's line of sight falls within the viewing angle range θ determined by . In this case, when the LCD 11 rotates relative to the base 13 due to vibration etc., in the case of a conventional LCDI, the viewing angle θ0 also changes from the LC.
Since the viewing angle range θ follows the rotation of the LCD 11, the viewing angle range θ is positioned outside the line of sight of the operator, but according to the device of this example, the voltage value applied to the LCD 11 is adjusted and the LcDl
The viewing angle θ1 of 1 is tilted in the opposite direction to the rotational axis direction of the LCD 11. Therefore, the operator's line of sight falls within the viewing angle range θ determined by the viewing angle θ1, and even after the LCD 11 rotates, the operator remains at the same position.
You can check the displayed characters of DII.

FIG. 4 is a diagram illustrating another embodiment of the present invention.

This example shows a case where the present device is provided on the LCD 20 of a laptop type personal computer. According to this example, unlike the case of the LCD 2 shown in FIG. 6, even when the LCD 20 is slightly rotated so that reflected light from illumination etc. does not enter the eyes, the operator's line of sight falls within the viewing angle range of the LCD 20. As a result,
The operator can easily check the characters displayed on the LCD 20 at the same position.

[Effects of the Invention] As explained above, according to the applied voltage adjustment device of the present invention, after the operator adjusts the orientation of the LCD to the best position where the displayed characters can be easily seen, the LCD rotates due to vibration etc.
Even if the direction of D changes, the LC will change depending on the rotation angle of the LCD.
Since the applied voltage D changes and the viewing angle of the LCD is tilted toward the operator, the operator can easily check the characters displayed on the LCD at the same position 1 even after the LCD is rotated.

[Brief explanation of drawings]

1 to 3 are diagrams for explaining the present invention in detail,
Figure 1 is a block diagram of the applied voltage adjustment device, Figure 2 is a perspective view of the input device equipped with an LCD, and Figure 3 is the LCD.
FIG. 3 is an explanatory diagram showing the relationship between the voltage applied to the display and the viewing angle. FIG. 4 is a diagram illustrating another embodiment of the present invention. FIGS. 5 and 6 are diagrams illustrating a conventional LCD mounting structure, and are diagrams illustrating rotation of the LCD and changes in viewing angle, respectively. 11...Liquid crystal display 13...Base 14...
・Rotating part 15...Rotation angle detection part 16・
... Power Supply Voltage Control Department Representative Patent Attorney Nori Chika Ken Yudo Sanno - Figure 2 Figure 4 Figure 3 Figure 5 Figure 6

Claims (1)

[Claims] An applied voltage adjustment device for a liquid crystal display, which adjusts the applied voltage in a liquid crystal display that is rotatably attached to a base and is a liquid crystal display whose viewing angle changes to obtain maximum contrast depending on the applied voltage. , the liquid crystal display is positioned on the base so that the viewing angle points in a predetermined direction when a voltage of a reference voltage value is applied, and the liquid crystal display is viewed from this reference position. A rotation angle detection section that detects the rotation angle; and a rotation angle detection section that adjusts the magnitude of the voltage applied to the liquid crystal display according to the rotation angle data detected by the rotation angle detection section, and adjusts the magnitude of the voltage applied to the liquid crystal display after rotation. An applied voltage adjustment device for a liquid crystal display, comprising a voltage control unit that tilts a viewing angle by a predetermined angle in a direction opposite to the rotational direction of the liquid crystal display with respect to the viewing angle when the reference voltage is applied. .