JP2000259112A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the liquid crystal display device which obtains right-left inverted video without partial inversion and gives a choice of which of right and left field angles is set a little larger when a longitudinal long picture is formed by a picture rotating function. SOLUTION: Data of >=1 horizontal period obtained by converting an input signal by an A/D converter 1 are stored in a storage element 2 and read out in each horizontal period on an LIFO(last-in first-out) basis to display right - left inverted video on a liquid crystal panel 5; and readout control by FIFO or LIFO is determined in each horizontal period by turning ON and OFF a changeover switch to determine which of normal video and the right - left inverted video is displayed. Further, the right and left field angles are switched by a pivot function which is able to rotate both clockwise and counterclockwise by about 90 deg..

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for displaying a left-right inverted image on a liquid crystal display device and a technique for selecting a right and left viewing angle by a pivot function.

[0002]

2. Description of the Related Art A conventional liquid crystal display device with an inverted display function will be described below with reference to FIG. The horizontal scanning direction is switched by a horizontal scanning inversion switch 10 for switching whether the transfer pulse applied to the source driver 9 of the liquid crystal panel 8 is transferred from the left side of the screen or from the right side.
Similarly, in the vertical direction, the vertical scanning direction is switched by a vertical scanning inversion switch 12 for switching whether the transfer pulse applied to the gate driver 11 is transferred from the upper side of the screen or from the lower side.

Further, the liquid crystal panel 8 is moved by a tilt mechanism.
It was configured to be able to rotate by 80 degrees, and had a structure that could handle both up and down directions. (JP-A-10-30154
0) Furthermore, the conventional pivot function only rotates clockwise or counterclockwise when rotating from a horizontally long screen to a vertically long screen.

[0004]

In the system in which the scanning direction is switched by the source driver and the gate driver as in the prior art, all the pixels displayed on the screen are horizontally inverted. Therefore, there is a problem in that, even when only a certain part is to be displayed without being inverted, for example, an on-screen display (hereinafter, abbreviated as OSD) which is operated by directly viewing the liquid crystal panel, there is a problem that all the images are inverted.

Also, as in the prior art, when rotating from a horizontally long screen to a vertically long screen, a pivot function that rotates only one of clockwise and counterclockwise is used. Since the viewing angles are different and switching is not possible, for example, there are many opportunities for viewing from the right side, but there is a problem that the viewing angle on the left side is wider and the viewing angle on the right side is narrow, making it difficult to see.

[0006]

In order to solve the above-mentioned problems, a liquid crystal display device having a left-right inversion function according to the present invention comprises: By storing the frame data in the storage element and controlling the readout by the LIFO for each horizontal period, when displaying on the liquid crystal panel, the image is displayed in a horizontally inverted image. It is determined whether read control is performed by FIFO or LIFO for each horizontal period by ON / OFF. When displaying on a liquid crystal panel, a normal image is displayed when read by FIFO, and left / right inversion is performed when read by LIFO. It is characterized by having a switching function to display the projected image, and a left and right viewing angle when displaying a vertically long screen by a pivot function. On the other hand, when switching the LCD panel to the portrait screen by the pivot function, it is possible to select either the left or right viewing angle to be larger by making the structure that can be rotated clockwise / counterclockwise. Can,
At least one frame of data obtained by A / D conversion of the input signal is stored in the storage element, and the changeover switch is turned on.
/ OFF for each horizontal and vertical period
O or LIFO is used to determine whether to perform read control. When displaying on a liquid crystal panel, normal video is displayed when read using FIFO, and 1 when read using LIFO.
By having a switching function of displaying an image rotated by 80 degrees, a correct image without rotation can always be displayed regardless of whether the pivot function of clockwise or counterclockwise is selected.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a display device using a liquid crystal panel, in which data or one frame of at least one horizontal period or more in which an input signal is A / D converted. Is stored in a storage element, and it is determined whether reading control is performed by FIFO or LIFO in each horizontal period by ON / OFF of a changeover switch. When displaying on a liquid crystal panel, a normal image is read when read by FIFO. It is characterized in that it has a switching function of displaying an image which is horizontally inverted when displayed and read out with the LIFO. Even when it is desired to display an image which is horizontally inverted and display only the OSD portion without being inverted, By superimposing the OSD signal on the subsequent stage of the storage device, it is possible to perform display without partial inversion.

According to a second aspect of the present invention, in a display device using a liquid crystal panel, an A / D converter for converting an input signal into a digital signal, and converting the converted digital signal into at least one horizontal period or more. Period data or 1
A storage element for storing frame data, a microprocessor for reading and controlling the stored data by FIFO or LIFO for each horizontal period, a changeover switch for determining whether the read control method is FIFO or LIFO, and a FIFO. It is characterized by having a liquid crystal panel that displays a normal image when read out by the LIFO, and displays a horizontally reversed image when read out by the LIFO, displays a horizontally reversed image, and OSD
Even when the display is desired to be performed without inverting only a part, by superimposing the OSD signal on the subsequent stage of the storage device, the display can be performed without partially inverting.

According to a third aspect of the present invention, there is provided a display device having a pivot function, wherein liquid crystal panels having different upper and lower viewing angles are used when the liquid crystal panels are arranged horizontally.
When the LCD panel is switched to the portrait screen by the pivot function, it can be rotated clockwise or counterclockwise, so that when the portrait screen is set, the left or right viewing angle can be set larger. And at least one frame of data obtained by A / D conversion of an input signal is stored in a storage element, and FIFO or L for each horizontal and vertical period is turned on / off by a changeover switch.
Determines whether to perform read control with the IFO, and when displaying on the liquid crystal panel, displays a normal video when read with the FIFO, and flips the video up and down and left and right when read with the LIFO, ie, a video rotated 180 degrees. Has the function of switching between the clockwise and counterclockwise pivot functions, so that the correct image without rotation is always displayed. This has the effect that it is possible to select which viewing angle should be set larger.

According to a fourth aspect of the present invention, when the liquid crystal panel is arranged horizontally, the liquid crystal panels having different upper and lower viewing angles are used, and the liquid crystal panel is rotated by about 90 degrees to form a horizontally long screen and a vertically long screen. In the display device having the function of switching between the horizontal and vertical directions, a pivot structure that can be rotated clockwise / counterclockwise to select which of the left and right viewing angles is set to be larger when the screen is vertically long, and an input signal is converted into a digital signal. An A / D converter, a storage element for storing at least one frame of data of the converted digital signal, a microprocessor for reading and controlling the stored data by FIFO or LIFO for each horizontal period and vertical period, and a read control for the microprocessor A changeover switch for determining whether the system is FIFO or LIFO;
When read by FO, normal video is displayed and LIF
It is characterized by having a liquid crystal panel that displays an image rotated by 180 degrees when read out with O, and it is possible to select which of the left and right viewing angles is set larger when the screen is set to be a portrait screen. It has the action of:

(Embodiment 1) An embodiment of the present invention described in claims 1 and 2 of the present invention will be described below with reference to FIG. In FIG. 1, 1 is A / D
The converter converts RGB input signals from analog to digital signals. Reference numeral 2 denotes a storage element for storing an A / D-converted digital signal, for example, a 1H line memory, which stores a digital signal having at least one horizontal cycle or more. Here, reference numeral 5 denotes a liquid crystal panel for displaying the read digital signal. Digital data of one horizontal cycle, which has been A / D-converted like a multi-scan display, is stored in one of the liquid crystal panels 5.
If they do not match the horizontal period digital data, 3
After the number of pixels is matched with the liquid crystal panel 5 by the pixel conversion IC, the data is written into the 1H line memory 2.

In this embodiment, the 1H line memory 2 is used as a storage element, but the 1H line memory 2 or the 3H line memory or the frame memory may be used.
It goes without saying that any storage element capable of storing a digital signal of a horizontal cycle or more can be used. Reference numeral 4 denotes a microprocessor which converts the digital data stored in the 1H line memory 2 into LI for one horizontal cycle of the liquid crystal panel 5.
By performing read control by the FO, digital data of an image that is inverted left and right is transferred to the liquid crystal panel 5. LCD panel 5
Receives the digital data of the read image and displays the image. Reference numeral 6 denotes a signal, such as an OSD, which is always desired to be displayed without being inverted, and is superimposed on the subsequent stage of the 1H line memory 2 so that a left-right inverted image can be displayed on the liquid crystal panel, and only the OSD is displayed without being inverted. Can also do
Reference numeral 7 denotes a changeover switch, which determines whether the microprocessor 4 performs read control by FIFO or LIFO. When the readout control is performed by the FIFO, the liquid crystal panel 5 can display an image without left-right inversion as usual, and when the readout control is performed by the LIFO,
Left and right inverted images can be displayed on the liquid crystal panel.

(Embodiment 2) Next, an embodiment of the present invention described in claims 3 and 4 of the present invention will be described with reference to FIGS. Note that the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 2, reference numeral 5 denotes a liquid crystal panel having a different viewing angle between an upper side and a lower side when the display panel is arranged in a horizontally long state. However, as shown in FIG. 2, by using a pivot function that can rotate about 90 degrees clockwise / counterclockwise, it is possible to select which of the left and right viewing angles is set to be larger when the screen is in the portrait orientation. However, when the liquid crystal panel 5 is rotated 180 degrees from the clockwise vertical direction to the counterclockwise vertical direction by the pivot function, the image is rotated by 180 degrees. Therefore, the following image rotating function is provided.

In FIG. 1, A / D converter 1, pixel conversion IC 3, microprocessor 4, liquid crystal panel 5, O
The SD 6 has the same configuration as the first embodiment of the invention, and uses a frame memory as the second storage element. The microprocessor 4 controls the reading out of the digital data stored in the frame memory 2 by the LIFO for one horizontal period and one vertical period of the liquid crystal panel 5, respectively. The digital data of the rotated video is transferred.

In this way, by combining the pivot function of rotating clockwise / counterclockwise by about 90 degrees and the function of rotating the image 180 degrees up, down, left, and right, the left and right fields of view can be obtained when the screen is vertically long. It is possible to set or select a larger corner.

[0017]

As described above, according to the liquid crystal display device with the left / right inversion function of the present invention, the inverted image can be displayed by switching the write / read control of the storage element, and only the OSD portion can be displayed. Even if you want to display without inverting, by superimposing the OSD signal on the subsequent stage of the storage device,
It can be displayed without partial inversion. In addition, by combining the pivot function that can rotate about 90 degrees clockwise / counterclockwise and the flip function of rotating the image 180 degrees vertically and horizontally, the viewing angle of either the left or right when the screen is vertically long is enlarged. It can be set or selected.

[Brief description of the drawings]

FIG. 1 is a block diagram of a liquid crystal display device according to Embodiment 1 of the present invention.

FIG. 2 is a configuration diagram of a liquid crystal display device according to Embodiment 2 of the present invention.

FIG. 3 is a block diagram of a conventional liquid crystal display device with an inversion function.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 A / D converter 2 Storage element (1H line memory / frame memory) 3 Pixel conversion IC 4 Microprocessor 5 Liquid crystal panel 6 OSD signal 7 Changeover switch 8 Liquid crystal panel (conventional technology) 9 Source driver 10 Horizontal scanning inversion switch 11 Gate Driver 12 Vertical scan inversion switch

Continued on front page F term (reference) 5C006 AA02 AA03 AB01 AC21 AF04 AF44 AF51 BB11 BC12 BF02 FA03 FA04 FA05 5C058 AA07 AA08 BA01 BA20 BA31 BB04 BB11 5C080 AA10 BB05 DD01 EE01 EE17 EE23 EE26 FF12 GG02 GG12 GG12GG

Claims (4)

[Claims] In a display device using a liquid crystal panel, data of one or more horizontal periods or at least one horizontal period obtained by A / D converting an input signal is stored in a storage element, and a switch is turned on / off. When turned off, FIFO (firstinfirsts) is applied for each horizontal period.
tout) or LIFO (lastinfinsto)
out) to determine whether to perform readout control, and when displaying on a liquid crystal panel, a switching function is provided to display a normal video when read out by FIFO, and to display a horizontally inverted video when read out by LIFO. Liquid crystal display device characterized by the following. 2. A display device using a liquid crystal panel, comprising: an A / D converter for converting an input signal into a digital signal; and converting the converted digital signal into data for at least one horizontal period or more for several horizontal periods or one frame. A storage element for storing data, a microprocessor for reading and controlling the stored data by FIFO or LIFO for each horizontal period, a changeover switch for determining whether the read control method is FIFO or LIFO,
When read out by IFO, normal video is displayed and LI
A liquid crystal display device including a liquid crystal panel that displays an image that is inverted left and right when read by an FO. 3. A function of switching between a horizontally long screen and a vertically long screen by using a liquid crystal panel having different upper and lower viewing angles when the liquid crystal panel is arranged horizontally and rotating the liquid crystal panel by about 90 degrees. Function is abbreviated as a function), the liquid crystal panel can be rotated clockwise / counterclockwise when switching to the portrait screen by the pivot function. The angle can be set to be larger or it can be selected, and at least one frame of data obtained by A / D conversion of an input signal is stored in a storage element, and the FI and the FI for each horizontal and vertical period are turned on / off by a changeover switch.
Determine whether to perform read control with FO or LIFO,
When displaying on a liquid crystal panel, it has a switching function of displaying a normal image when read out by FIFO, and displaying an image that is inverted upside down, left and right, that is, an image rotated 180 degrees when read out by LIFO. A liquid crystal display device capable of always displaying a correct image without rotation, regardless of whether the pivot function of clockwise or counterclockwise is selected. 4. A display device having a function of switching between a horizontally long screen and a vertically long screen by using a liquid crystal panel having a different viewing angle between an upper side and a lower side when the liquid crystal panel is arranged horizontally and rotating the liquid crystal panel by about 90 degrees. A pivot structure that can be rotated clockwise / counterclockwise to select which of the left and right viewing angles is set to be larger when a portrait screen is used, an A / D converter that converts an input signal into a digital signal, A storage element for storing at least one frame of data of the converted digital signal, a microprocessor for reading and controlling the stored data by FIFO or LIFO for each horizontal period and vertical period, and a FIFO control or LIFO read control method; Switch to determine whether to read, and display a normal video when read out by FIFO. , 1 when read by LIFO
A liquid crystal display device comprising a liquid crystal panel for displaying an image rotated by 80 degrees.