JPH0710791U - Liquid crystal display controller - Google Patents

Abstract

(57) [Summary] [Purpose] The contrast of the liquid crystal is changed according to the installation direction of the remote control transmitter. [Configuration] Remote control transmitter 1, light receiving section 2 having light receiving elements 11 to 19, CPU 3, ROM 4, D / A converter 5, video signal output circuit 6, and video signal processing circuit 7
In the liquid crystal display control circuit including the liquid crystal panel 8, the infrared ray from the remote control transmitter 1 is received only by a specific light receiving element of the light receiving section 2, and the light receiving element that receives the light outputs a reception signal. The CPU 3 detects the installation direction of the remote control transmitter 1 by the light receiving element that outputs the reception signal, and outputs the optimum contrast adjustment value in that direction to the ROM 4
Read from. The value is converted into an analog signal by the D / A converter 5 and then combined with the video signal from the video signal output circuit 6 by the video signal processing circuit 7 to be displayed on the liquid crystal panel 8. As a result, the liquid crystal display can always have the optimum contrast.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a liquid crystal display control device capable of remote control control and changing the contrast of a liquid crystal screen.

[0002]

[Prior art]

 The use of liquid crystal as a display screen for televisions, computers, etc. has the advantage that the installation area and power consumption can be reduced compared to the display by a normal cathode ray tube, and since the resolution and price are almost the same as those of cathode ray tubes. Liquid crystals are widely used in various devices such as televisions. On the other hand, an increasing number of devices are turning on / off the power, switching screens, etc. by controlling the remote control (hereinafter referred to as remote control) using infrared rays. For example, if a liquid crystal television is controlled by a remote controller, various kinds of operations can be performed even from a position away from the liquid crystal television, so that operability can be improved.

[0003]

[Problems to be solved by the device]

 However, since the liquid crystal display has a narrower viewing angle than the display using a cathode ray tube, the contrast (brightness difference) of the screen is completely different depending on the viewing angle of the screen. For this reason, conventional liquid crystal display devices such as liquid crystal televisions are generally set to have the optimum contrast when viewed from the front. Therefore, when the liquid crystal display screen is viewed from a position other than the front, the display has poor contrast. For this reason, in some conventional liquid crystal display devices, the contrast can be adjusted by the contrast adjustment knob provided on the side of the screen. It is also possible to provide such a knob on the remote control transmitter, but it is cumbersome to readjust each time the screen viewing angle changes.

An object of the present invention is to provide a liquid crystal display control device that automatically changes the contrast of a liquid crystal display according to the installation direction of an operation instruction member.

[0005]

[Means for Solving the Problems]

 The present invention will be described with reference to FIG. 1 showing an embodiment. The present invention is applied to a liquid crystal display control device that performs remote control control by receiving a signal output from the operation instruction member 1, and the operation is performed. Receiving means 2 that outputs different signals depending on the direction of the signal from the indicating member 1, direction determining means 31 that determines the installation direction of the operation indicating member 1 based on the signal received by the receiving means 2, and this direction The above object can be achieved by the configuration including the contrast varying means 32 that changes the contrast of the liquid crystal display according to the installation direction of the operation instruction member 1 determined by the determining means 31. According to a second aspect of the present invention, in the liquid crystal display control device according to the first aspect, a plurality of sensors arranged in different directions are configured to output the different signals.

[0006]

[Action]

 In the invention according to claim 1, the signal from the operation instructing member 1 is received by the receiving means 2, the direction discriminating means 31 discriminates the installation direction of the operation instructing member 1 by the signal, and the determined installation direction. Accordingly, the contrast changing means 32 changes the contrast of the liquid crystal display. In the device according to the second aspect, since the signals from the different directions are received by the sensors 11 to 19 arranged in different directions, the direction discriminating means 31 determines the installation direction of the operation instructing member 1. Can be determined.

Incidentally, in the section of means and action for solving the above problems for explaining the configuration of the present invention, the drawings of the embodiments are used for the sake of easy understanding of the present invention. It is not limited to the example.

[0008]

【Example】

 An embodiment in which the present invention is applied to a liquid crystal television will be described below with reference to FIGS. 1 is a block diagram of an embodiment of a liquid crystal display control device according to the present invention. Reference numeral 1 denotes a remote control transmitter that emits an infrared ray, and emits infrared rays of different frequencies according to the type of operation of the LCD TV to instruct the operation procedure. Reference numeral 2 denotes a light receiving unit that receives the infrared light emitted from the remote control transmitter. As shown in FIGS. 2 and 3, the light-receiving unit 2 outputs a predetermined reception signal by receiving infrared rays. Nine light-receiving elements 11 to 19 are provided laterally on the liquid crystal panel 8 in the vertical and horizontal directions. It is an average item. The light receiving range of each of the light receiving elements 11 to 19 is limited to a range of 30 ° around a predetermined light receiving axis, and the respective light receiving axes are directed in different directions as described in detail in FIG. That is, with respect to the left-right direction of the liquid crystal television, the light receiving axes of the light receiving elements 12, 15, 18 in the central column are in the central direction as indicated by the broken line B, and the light receiving elements 11, 14, in the left column facing the liquid crystal television, As shown by the broken line C in the figure, the light receiving axis of the light receiving element 17 is tilted to the left from the center as shown by the broken line A in the figure. They are oriented in the directions tilting from the center to the right. Further, regarding the vertical direction of the liquid crystal television, the light receiving axes of the light receiving elements 14, 15, 16 in the central row are in the central direction as indicated by a broken line E, and the light receiving axes of the light receiving elements 11, 12, 13 in the upper row are. Is inclined from the center direction to the upper side as indicated by the broken line D in the figure, and the light receiving axes of the light receiving elements 17, 18 and 19 in the lower row are inclined from the center direction to the lower side as indicated by the broken line F in the figure. It is directed in each direction. As shown in Fig. 3, the range where each light receiving element receives infrared rays partially overlaps. Therefore, when infrared rays are input from this overlapping range, the received signals are received from the multiple light receiving elements that receive infrared rays. Is output. In this way, the light receiving ranges of the infrared rays are partially overlapped in order to prevent a region where the light receiving elements cannot receive the infrared rays from being formed between the light receiving areas of the respective light receiving elements.

Received signals from the light receiving elements 11 to 19 are input to the CPU 3. The CPU 3 includes a direction discriminating means 31 which discriminates the installation direction of the remote control transmitter 1 based on signals from the light receiving elements 11 to 19, and a contrast varying means 32 which reads an optimum contrast adjustment value from the ROM 4 based on the result. Have. Reference numeral 4 is a ROM that stores contrast adjustment values. This ROM 4 stores the contrast adjustment values that are optimal when the liquid crystal panel 8 to be described later is viewed from the direction of infrared rays transmitted from the remote control transmitter 1. ing. The CPU 3 reads a predetermined contrast adjustment value from the ROM 4 according to the light receiving element that receives the infrared light, and outputs this as a contrast adjustment signal. This contrast adjustment signal is converted into an analog signal by the D / A converter 5. The analog signal from the D / A converter 5 and the video signal from the video signal output circuit 6 are input to the video signal processing circuit 7, a video signal with adjusted contrast is created, and the result is displayed on the liquid crystal panel 8. Is displayed.

FIG. 4 is a flowchart showing the operation of the CPU 3 shown in FIG. 1, and the operation of the present embodiment shown in FIG. 1 will be described based on this figure. It should be noted that this flowchart starts its operation when the liquid crystal television is turned on. In step S1, it is determined whether or not infrared rays are emitted from the remote control transmitter 1 by detecting the reception signals from the light receiving elements 11 to 19. If it is determined that infrared rays are emitted, the process proceeds to step S2. In step S2, it is determined whether or not only one of the light receiving elements 11 to 19 has received infrared rays. If it is determined that only one light is received, the process proceeds to step S3, the light receiving element that receives the infrared light is specified, and the installation direction of the remote control transmitter 1 is detected. For example, in FIG. 3, if only the light-receiving element 18 shown by the shaded line receives the infrared rays, the incident directions of the infrared rays in the left-right direction and the upward and downward directions are the directions shown by the double lines in FIG. 3, respectively. To detect. Then, the CPU 3 reads the contrast adjustment value for the detected direction from the ROM 4.

On the other hand, when it is determined in step S2 that the plurality of light receiving elements 11 to 19 have received infrared rays, the process proceeds to step S4, where the midpoints of the installation positions of all the light receiving elements 11 to 19 received are Select as the installation direction of the remote control transmitter 1. For example, in FIG. 3, if the light receiving elements 11 to 13 receive infrared rays, it is assumed that the infrared rays are input from the direction in which the light receiving element 12 in the middle receives the infrared rays, and the contrast adjustment value in that direction is set. Read from ROM4. In step S5, the contrast adjustment signal read from the ROM 4 is output as a contrast adjustment signal. Thus, for example, when an infrared ray is incident from the left side of the liquid crystal panel 8, a contrast adjustment signal is output so that the contrast is optimized when the liquid crystal panel 8 is viewed from the left side. This signal is input to the video signal processing circuit 7 via the D / A converter 5, and a video signal having a contrast adjusted is created and displayed on the liquid crystal panel 8.

As described above, according to the above-described embodiment, the contrast of the liquid crystal panel 8 is automatically changed so that the contrast becomes optimum when the liquid crystal panel 8 is viewed from the installation direction of the remote control transmitter 1. Therefore, the operator of the remote control transmitter 1 can always see the display on the liquid crystal panel 8 with the optimum contrast.

In the above embodiment, an example in which the liquid crystal display control device according to the present invention is applied to a liquid crystal television is shown, but it is also applied to various devices including a liquid crystal panel such as a calculator and a computer display. it can. Further, in the above embodiment, nine light receiving elements are provided to specify the receiving direction of the remote control transmitter, but if the number of light receiving elements is increased, the receiving direction can be specified in more detail. Become. Further, in the above embodiment, the example in which the infrared ray emitted from the remote control transmitter is received by the light receiving section has been shown, but the remote control method may be any other method, for example, the radio wave transmitted from the remote control transmitter. May be received. Alternatively, the installation direction of the remote control transmitter may be detected by transmitting an ultrasonic signal from the remote control transmitter and receiving it by a rotary antenna provided in the light receiving unit. Furthermore, a contrast changeover switch may be provided in the remote control transmitter, and only when this switch is turned on, the contrast may be changed depending on the installation direction of the remote control transmitter as in the above embodiment.

In the embodiment configured as described above, the remote control transmitter 1 is the operation instruction member, the light receiving elements 11 to 19 are the receiving portions, the direction discriminating means 31 inside the CPU 3 is the direction discriminating means, and the CPU 3 is. The internal contrast varying means 32 corresponds to the contrast varying means, respectively.

[0015]

[Effect of device]

 As described above in detail, according to the present invention, since the installation direction of the operation instruction member is determined and the contrast of the liquid crystal display is automatically changed according to the direction, the operator of the operation instruction member is always optimal. You can see the liquid crystal display with the contrast of.

[Brief description of drawings]

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

FIG. 2 is a front view of a liquid crystal television.

FIG. 3 is a diagram showing a relationship between a light receiving element and an incident angle of infrared rays.

FIG. 4 is a flowchart showing an operation of the CPU of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Remote control transmitter 2 Light receiving part 3 CPU 4 ROM 5 D / A converter 6 Video signal output circuit 7 Video signal processing circuit 8 Liquid crystal panel

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location H04N 5/66 102 B 9186-5C H04Q 9/00 301 E 7170-5K

Claims (2)

[Scope of utility model registration request] 1. A liquid crystal display control device for performing remote control control by receiving a signal output from an operation instructing member, and receiving means for outputting a different signal depending on the direction of the signal from the operation instructing member. Direction determining means for determining the installation direction of the operation instructing member based on the signal received by the receiving means, and changing the contrast of the liquid crystal display according to the installation direction of the operation instructing member determined by the direction determining means. A liquid crystal display control device comprising: a contrast varying means. 2. The liquid crystal display control device according to claim 1, wherein a plurality of sensors arranged in different directions are provided.
A liquid crystal display control device which outputs the different signals.