JP2002091401A - Display device for electronic equipment and lighting controller for multicolor light source - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to confirm the operating state of equipment such as a VCR instantly even from a long distance and to make it possible that a user can customize confirmation display. SOLUTION: The back light system of a liquid crystal display panel 17 is provided with light sources 19R, 19G, 19B of three primary colors R, G, B and has a function for exhibiting multiple colors by controlling these light sources individually with an RGB control part 13A. The RGB control part 13A is further provided with a function for changing the emission color of a back light for every various operation mode provided in a mounted equipment by referring to color setting contents for every operation mode stored in a memory part 15. Moreover, this equipment is provided with mode color setting means (14, 15) for selecting the color of the back light freely for every operation mode on the basis of a user' operation from operating parts 20 or 21 to set the selected mode colors in the memory part 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a display device of an electronic device used for an electronic device having a liquid crystal display unit such as a video tape recorder and a multicolor light source lighting control device.

[0002]

2. Description of the Related Art Conventionally, video tape recorders (hereinafter referred to as V
For display of TR, a fluorescent display tube or a liquid crystal display panel has been adopted.

FIG. 12 is a block diagram showing a liquid crystal display unit with a backlight in a conventional VTR, an OSD circuit unit for performing on-screen display of an operation state and the like, and a control means for controlling them.

A VTR shown in FIG. 12 includes a microcomputer 10 as control means, a display drive circuit 16 for a liquid crystal display panel, a liquid crystal display panel 17 for displaying various operating states, and a drive for a backlight light source. An output unit 18A and L used as a light source for a liquid crystal backlight
An ED 19, a remote control transmitter (hereinafter, referred to as a remote controller) 20, and a keyboard 2 provided on the VTR body
1, a video circuit unit 22 that processes a television broadcast signal or the like and outputs a video signal, and an OSD circuit unit 23 that superimposes an on-screen display (OSD) signal on the video signal.
And

[0005] Microcomputer 1 as control means
Numeral 0 includes various functional units such as a logic control unit 11, a mode setting unit 12, a light source control unit 13, an OSD control unit 14, and a memory unit 15.

[0006] The logic control unit 11 is provided with a remote control input from a remote control 20 and a keyboard 21 in the VTR main body.
, And instructs the mode setting unit 12 on various operation states.

The mode setting section 12 sends control signals to the display drive circuit section 16, the light source control section 13, and the OSD control section 14 in accordance with the contents of the designated operation mode.

The display drive circuit section 16 sends a display drive signal to a display segment of a liquid crystal display panel 17 which is a liquid crystal display section based on a control signal from the mode setting section 12, and outputs a liquid crystal display according to an operation mode. I do. The display drive circuit section 16 and the liquid crystal display panel 17 are not limited to those that perform segment display, and other display methods such as dot matrix display are used. Here, a light transmission type liquid crystal display panel is used.

The light source control unit 13 sends a light source drive signal to the drive output unit 18 based on a control signal from the mode setting unit 12 to turn on (on), turn off (off) and turn on the backlight light source LED 19. Is controlled.

The OSD control section 14 reads out the on-screen display contents stored in the memory section 15 in response to the control signal from the mode setting section 12 and outputs it to the OSD circuit section 23 as an on-screen display signal. It is superimposed on the video signal from the video circuit section 22 and supplied to an output stage (not shown) of a television receiver and a cathode ray tube (CRT) to be displayed on a television screen.

In the above-mentioned liquid crystal display panel of the VTR, the operation mode of the VTR is displayed in the liquid crystal display panel. However, since the display is performed in a limited area, it is very small and difficult to see. .

In particular, VTRs are often used by remote control using a remote controller, and the difficulty in checking the operation state has been a factor that hinders the user's usability.

[0013]

As described above, a VTR is a device mainly operated by a remote controller, but its operation state can only be confirmed by a small display using characters on a fluorescent display tube or a liquid crystal panel. This was a factor that hindered usability.

In view of the above, the present invention has been made in view of the above-mentioned problems, and allows the operating state of a device such as a VTR to be checked instantaneously even from a distant place, and allows the user to customize the confirmation display. It is an object of the present invention to provide a display device of an electronic device and a multi-color light source lighting control device that can be used.

[0015]

According to a first aspect of the present invention, there is provided a display device for an electronic device, wherein a liquid crystal display panel, a three primary color light source used as a backlight of the liquid crystal display panel, and various operation modes of the device are set. A mode setting section to
By storing the color setting contents of each operation mode and referring to the color setting contents of the storage unit according to the operation mode set by the mode setting unit, individually controlling the three primary color light sources. And an RGB control unit that controls to change the color of the backlight for each operation mode.

According to a second aspect of the present invention, there is provided a display device for an electronic device, a liquid crystal display panel, a three primary color light source used as a backlight of the liquid crystal display panel, and a mode setting section for setting various operation modes of the device. By storing the color setting contents of each operation mode and referring to the color setting contents of the storage unit according to the operation mode set by the mode setting unit, individually controlling the three primary color light sources. R that controls the backlight color to change for each operation mode
A GB control unit; and a mode color setting unit for arbitrarily selecting a backlight color for each operation mode based on an instruction from the operation unit and storing the selected color in the storage unit.

According to a third aspect of the present invention, in the display device of the electronic device according to the first or second aspect, the mode setting section can set a demonstration mode based on an instruction from an operation section, and the RGB control section Is characterized in that when the demonstration mode is set in the mode setting section, the color of the backlight is automatically and sequentially changed.

According to a fourth aspect of the present invention, in the display device of the electronic device according to the first or second aspect, the electronic apparatus further comprises a setting means for setting whether or not to operate the demonstration mode. In the state where the demonstration mode is set in the setting unit, when the power of the device is turned on from off, the demonstration mode is executed, and control is performed so that the color of the backlight is automatically and sequentially changed. And

According to a fifth aspect of the present invention, in the display device for an electronic device according to the second aspect, the mode color setting means stores on-screen function setting screen information when the device is a VTR. And an OSD control unit for displaying the on-screen function setting screen information on-screen on a television receiver and enabling color selection for each operation mode based on an instruction from an operation unit. I do.

According to a sixth aspect of the present invention, in the display device of the electronic device according to the second or fifth aspect, the color selection for each operation mode in the mode color setting means can be distinguished by changing a set color between confusing operation modes. It is characterized by having.

According to a seventh aspect of the present invention, in the electronic device display device according to the second or fifth aspect, the mode color setting means fixes a specific operation mode to a specific color in advance.
It is characterized in that arbitrary color selection is disabled.

According to the above-described inventions of claims 1 to 7, in a device such as a VTR, a backlight can be colored in multiple colors. In addition, the backlight color can be switched for each operation mode of the device, and the user can freely select the color setting for each mode, so that customization suitable for the user can be easily performed.

According to an eighth aspect of the present invention, in the display device of the electronic device according to the first or second aspect, the RGB control section is substantially the same regardless of the total emission time of each color light source per unit time regardless of the emission color. It is characterized in that it is controlled so that

According to a ninth aspect of the present invention, in the display device of the electronic device according to the first or second aspect, the RGB control section turns on a plurality of light sources among the three primary color light sources to determine a light emission color. The control is performed such that the total sum of the light emission times of the respective color light sources to be performed is substantially the same regardless of the light emission color determined by the combined light emission of the respective color light sources in a unit time.

According to a tenth aspect of the present invention, in the display device of the electronic device according to the first or second aspect, the RGB control unit includes:
In the case where a plurality of light sources among the three primary color light sources are turned on to determine the emission color, pulse drive control with a constant cycle and pulse width is performed for a part or all of the light sources to be turned on.

According to an eleventh aspect of the present invention, in the display device of the electronic equipment according to the eighth aspect, when the RGB control section determines the emission color by turning on a plurality of light sources among the three primary color light sources, it is preferable that the RGB control section be used in a unit time. It is characterized in that control is performed so that the sum of the light emission times of a plurality of light sources to be turned on is substantially the same as when all the light sources are turned on.

According to a twelfth aspect of the present invention, in the display device of the electronic equipment according to the tenth aspect, the RGB control section temporally outputs each color lighting pulse in a unit time by the pulse driving for each color light source to be turned on. Dispersed.

According to a thirteenth aspect of the present invention, in the display device of the electronic equipment according to the first or second aspect, the RGB control unit includes:
Each color light source drive voltage is controlled such that the sum of the drive currents of the respective color light sources per unit time is substantially the same regardless of the emission color.

According to a fourteenth aspect of the present invention, in the display device of the electronic device according to the first or second aspect, the RGB control unit includes:
In the case where a plurality of light sources among the three primary color light sources are turned on to determine the emission color, the sum of the drive currents of the respective color light sources to be turned on is roughly the same for any emission color determined by the combined emission of each color light source in a unit time. It is characterized in that the driving voltages for the respective color light sources are controlled to be the same.

According to a fifteenth aspect of the present invention, in the display device of the electronic device according to the thirteenth aspect, when the RGB control section determines a light emission color by lighting a plurality of light sources among the three primary color light sources, Each color light source drive voltage is controlled such that the sum of drive currents of a plurality of light sources to be turned on is substantially the same as when one light source is fully turned on.

According to the eighth to fifteenth aspects of the present invention, in a device using a multi-color light source as a backlight for a liquid crystal display panel, the brightness of the light source and the light source of the light source can be obtained regardless of the emission color. The power consumption can be made substantially constant. Further, temporal color unevenness and luminance change due to pulse driving can be reduced.

A multicolor light source lighting control device according to a sixteenth aspect of the present invention changes a light emission color by individually controlling the three primary color light sources and the three primary color light sources. And an RGB controller for controlling the light emission colors to be substantially the same.

A multicolor light source lighting control device according to a seventeenth aspect of the present invention changes a light emission color by controlling three primary color light sources and the three primary color light sources individually, and turns on a plurality of light sources among the three primary color light sources. When determining the emission color,
An RGB control unit that controls the total sum of the light emission times of the respective color light sources to be turned on to be substantially the same in any of the emission colors determined by the combined emission of the respective color light sources in a unit time. I do.

The multicolor light source lighting control device according to the invention of claim 18 changes the emission color by controlling the three primary color light sources and the three primary color light sources individually, and turns on a plurality of light sources among the three primary color light sources. When determining the emission color,
An RGB control unit that performs pulse drive control with a constant cycle and pulse width for part or all of each color light source to be turned on;
It is characterized by having.

A multicolor light source lighting control device according to a nineteenth aspect of the present invention changes a light emission color by individually controlling three primary color light sources and the three primary color light sources, and turns on a plurality of light sources among the three primary color light sources. When determining the emission color,
And an RGB control unit for controlling the total of the light emission times of the plurality of light sources to be turned on per unit time to be substantially the same as when one light source is turned on.

According to a twentieth aspect of the present invention, in the multi-color light source lighting control device according to the eighteenth aspect, the RGB control section temporally outputs each color lighting pulse within a unit time by the pulse driving for each color light source to be turned on. It is characterized by being dispersed.

According to a twenty-first aspect of the present invention, the multi-color light source lighting control device changes a light emission color by individually controlling the three primary color light sources and the three primary color light sources. And an RGB control unit that controls the driving voltages of the respective color light sources so that the light emission colors are substantially the same.

According to a twenty-second aspect of the present invention, there is provided a multicolor light source lighting control device for changing a light emission color by controlling three primary color light sources and the three primary color light sources individually. When determining the emission color,
An RGB control unit that controls the driving voltage of each color light source so that the sum of the drive currents of the light sources of each color to be turned on is substantially the same for any emission color determined by the combined emission of each color light source in a unit time. It is characterized by having done.

According to a twenty-third aspect of the present invention, there is provided a multicolor light source lighting control device for changing a light emission color by controlling three primary color light sources and the three primary color light sources individually. When determining the emission color,
An RGB control unit for controlling the driving voltage of each color light source such that the sum of the drive currents of a plurality of light sources to be turned on per unit time is substantially the same as when one light source is all turned on. .

According to the above-mentioned inventions of claims 16 to 23, in a device that emits multi-colors using a multi-color light source, the brightness of the light source and the power consumption of the light source are obtained regardless of the emission color. The amount can be made substantially constant. Further, temporal color unevenness and luminance change due to pulse driving can be reduced.

[0041]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a display device of an electronic device according to an embodiment of the present invention. In FIG.
FIG. 2 shows a liquid crystal display unit with a backlight in a VTR, an OSD circuit unit for performing on-screen display of an operation state and the like, and a control unit for controlling them.

The VTR shown in FIG. 1 includes a microcomputer 10A as control means, a display drive circuit section 16 for a liquid crystal display panel, a liquid crystal display panel 17 for displaying various operating states, and a drive output for three primary color light sources. Part 18
A, R, G, and B three primary color LEDs 19R, 19G, and 19B used as three primary color light sources for a liquid crystal backlight;
Remote control 20, keyboard 21 provided on VTR main body
And a video circuit section 22 for processing a television broadcast signal or the like and outputting a video signal, and an OSD circuit section 23 for superimposing an on-screen (OSD) display signal on the video signal.
And a detector 24 for detecting various mechanical operations of the VTR, timer time, power ON / OFF, and the like.

Microcomputer 1 as control means
Reference numeral 0A denotes a logic control unit 11 for decoding remote control input and keyboard input, and a mode setting unit 1 for setting a VTR operation mode corresponding to remote control input and keyboard input.
2, an RGB control unit 13A for controlling the three primary color light sources, an OSD control unit 14 for controlling the on-screen display, and a memory as a storage unit for storing the on-screen display contents and the backlight coloring contents for each operation mode. Various functional units such as the unit 15 are provided.

The logic control unit 11 decodes a remote control input from the remote control 20, a key input from the keyboard 21 of the VTR main body, and various detection signals from the detection unit 24, and instructs the mode setting unit 12 on various operation states. .

In the mode setting section 12, the logic control section 1
Control signals are sent to the display drive circuit unit 16, the RGB control unit 13A, and the OSD control unit 14, respectively, according to the contents of the operation mode instructed from Step 1.

The memory section 15 stores, in addition to the on-screen display contents, the coloring of the backlight for each operation mode.

The display drive circuit section 16 sends a display drive signal to a display segment of a liquid crystal display panel 17 which is a liquid crystal display section, based on a control signal from the mode setting section 12, and outputs a liquid crystal display corresponding to the operation mode. I do. The display drive circuit section 16 and the liquid crystal display panel 17 are not limited to those that perform segment display, and other display methods such as dot matrix display are used. Here, a light transmission type liquid crystal display panel is used.

The RGB control section 13A includes the mode setting section 12
In response to the control signal from the CPU, the setting content of the backlight color for each operation mode stored in the memory unit 15 is read, and the three primary color light source driving signals corresponding to the color are output to the drive output unit 18A, and the multi-color It controls the lighting (on) / off (off) of the R, G, and B LEDs 19R, 19G, and 19B for the backlight and the amount of light emission when the backlight is on. A method of driving each color LED by the RGB control unit 13A will be described later with reference to FIGS. In addition,
The RGB control unit 13A stores the relationship between the R, G, and B primary color light source drive signals supplied from the RGB control unit 13A to the drive output unit 18A and the emission colors (or is stored in the memory unit 15). When an operation mode is set in the mode setting unit 12 based on a user's remote control input operation or keyboard input operation, a color corresponding to the operation mode is stored in the memory unit 1.
5, the R, G, B three primary color light source drive signals to be supplied to the drive output unit 18A can be determined from the relationship between the R, G, B three primary color light source drive signals and the emission colors.

The drive output unit 18A is connected to the RGB control unit 1
LED 19 for each color according to the three primary color light source drive signal from 3A.
By controlling on / off control or pulse drive of R, 19G, 19B, and controlling the amount of drive current of each color LED 19R, 19G, 19B, each color LED 19R, 19B is controlled.
G / 19B on / off control, LED 1 for each color
The brightness and power of each of 9R, 19G, and 19B can be controlled.

The OSD control section 14 reads out the on-screen display contents stored in the memory section 15 in response to the control signal from the mode setting section 12 and outputs it to the OSD circuit section 23 as an on-screen display signal. It is superimposed on the video signal from the video circuit section 22 and supplied to an output stage (not shown) of a television receiver and a cathode ray tube (CRT) to be displayed on a television screen.

The detection unit 24 is connected to the logic control unit 11, generates an instruction signal (detection signal) from a unit other than the operation unit 20 or 21, and supplies it to the logic control unit 11. For example, the VTR of the cassette Inserting the cassette into the drive position, loading the cassette from the cassette, loading the tape on the rotating drum, detecting the mechanical operation state such as detecting the tape running state, or setting the timer reservation time A detection signal is supplied to the logic control unit 11 by detecting arrival, detecting power-on, and detecting an abnormality in a circuit and mechanism inside the VTR.

Based on the detection signal from the detector 24, V
The TR sets the operation mode by itself. For example, when the user mounts a cassette, the detecting unit 24 detects it, outputs a detection signal to the logic control unit 11, sets a reproduction mode first for a predetermined period, during which the type of the cassette, After recognizing the number specifying the cassette, the tape is rewound for a long time in the reproduction mode, and then the stop mode is set. Alternatively, the recording mode is set when the detection unit 24 detects that the timer reservation set time has arrived.

In this embodiment, a mode color setting means is provided to set (store) the backlight color of the liquid crystal display panel 17 in the memory unit 15 for each operation mode. When the device is a VTR, the mode color setting means is a memory unit (storage unit) 1 that also stores on-screen function setting screen information as one of the on-screen display contents.
And an OSD control unit 14 for displaying the on-screen function setting screen information on-screen on the television receiver and controlling to select a backlight color for each operation mode based on an instruction from the operation unit 20 or 21. It is composed of

The color selection for each operation mode in the mode color setting means can be made identifiable by changing the backlight color between confusing operation modes, so that the user can operate the liquid crystal display even if the user is remotely operating with a remote control. It is possible to easily confirm the current operation mode based on the difference in the backlight color of the display panel 17 and eliminate operation errors. For example, when repeating the operation of switching to the recording pause mode to cut an unnecessary scene while recording in the recording mode and shifting to the recording mode again, the color of the entire liquid crystal display panel 17 is changed every time the mode is switched. Since the mode is changed, the mode switching can be confirmed instantaneously, and the possibility of occurrence of an erroneous operation error can be reduced.

Also, when the operation mode is set by the VTR itself, the backlight color changes for each operation mode, so that the user can easily know the transition of the operation mode state, which is convenient.

The mode color setting means fixes a specific operation mode among a plurality of operation modes of the VTR to a specific color in advance, and disables any color selection for the specific operation mode. May be configured. Thus, for example, an operation mode frequently used by a large number of users is fixedly set at the factory stage, and each user can freely set a color in an operation mode whose use frequency varies depending on the user's preference.

Further, with respect to the instruction (detection) by the detection unit 24, for example, a detection unit for detecting an abnormality such as a current or a voltage is provided in various circuits in the device such as a VTR, and a back-up is performed when the abnormality is detected. The configuration may be such that the light color is switched to a specific color (for example, red) and turned on or blinked to notify the abnormality.

FIG. 2 shows a multi-color setting mode setting screen provided on the on-screen function setting screen of the VTR. The multi-color setting means that the user arbitrarily selects the color of the backlight of the liquid crystal display panel 17 in correspondence with each operation mode such as VTR playback, video recording, and video recording pause, and sets (stores) it in the memory unit 15. )It is to be.

First, the remote controller 20 or the keyboard 21
For example, when the multi-color setting mode is selected on the function setting menu screen by pressing the menu button of FIG.
The multi-color setting screen shown on the screen is displayed on-screen, and the backlight color corresponding to each item (for example, each operation mode of stop, playback, recording, recording pause, reservation setting, viewing navigation, and recording navigation) can be freely set. Can be set and changed. A backlight color can be selected in a user setting area corresponding to each operation mode item. The “view navigator” is a display of a recorded list for cueing, and the “record navigator” is a display of a recording history of a channel for the next recording reservation, recording start / end time, and the like. is there.

The mode setting unit 12 is provided with the operation unit 2
The demo mode can be set based on an instruction (operation of a specific key) from 0 or 21. The RGB control unit 13A
When the demo mode is set in the mode setting section 12, control is performed to automatically and automatically change the color of the backlight. For example, the color is sequentially changed from blue → light blue → green → orange → red → pink → purple → blue (each color is lit for 5 seconds, for example). That is, control for automatically changing the operation mode to cyclic is performed.

A main power supply of the VTR (here, the main power supply is an operation power supply provided separately from a standby power supply for driving the control microcomputer 10A, and is a power supply for enabling each circuit unit in the device to operate). It is also possible to start the automatic demonstration mode when turning on from off). To enable this automatic demo mode with power on,
There is setting means (setting on the on-screen screen) for determining whether or not to operate the demo mode as shown in FIG. 2, and the demo mode is automatically set when the power is turned on because the demo mode operation is set. Start. The automatic demo mode can be set by changing the demo mode item from "off" to "on" on the multi-color setting screen shown in FIG. Regarding the stop of the automatic demonstration mode, the demonstration mode is stopped by operating a specific key of the operation unit 20 or 21 or shifting to the traveling system mode. Alternatively, even if a predetermined time has elapsed since the start of the demo mode, the operation can be stopped when no specific key is operated.
In the VTR, the demo mode may be automatically started when there is no key operation for a predetermined time (for example, 10 minutes) in the 'EJECT' (eject) or 'STOP' (stop) mode. Further, after the start of the demo mode, the sequential change of the backlight color is started as described above, and at the same time, the predetermined time after the start of the demo mode (for example, 5 minutes).
For a second, characters such as “HELLO” may be displayed on the liquid crystal display panel 17. When the main power is off, the demo mode is stopped and the backlight is turned off.

In the above configuration, when the operation mode is switched by operating the remote controller 20 or the keyboard 21, the RGB control unit 13A sets the mode setting unit 1
By reading the backlight color corresponding to the operation mode set in 2 from the memory unit 15 and controlling the drive current or the light emission time of each color LED of the R, G, B light sources so as to correspond to the backlight color, Three primary color light sources (19R,
19G, 19B) are switched to the set backlight color. Since the backlight color of the liquid crystal display panel 17 changes according to the operation mode, the user can check the current operation mode and the switched operation mode at a glance even when operating the remote controller 20 from a distance, and can eliminate an operation error. . As mentioned above, for example,
If you want to start recording with the remote control and cut out scenes that are not necessary for recording, you need to switch to the recording mode after switching to the recording pause mode while watching the TV screen. In this case, it is difficult to confirm whether the VTR mode is the recording mode or the recording pause mode by the conventional character display alone. However, as in the embodiment of the present invention, it is difficult to determine whether the VTR mode is the recording mode or the recording pause mode. The liquid crystal display panel 1 changes the light color between the recording mode and the recording pause mode.
Since the color development of the whole 7 changes, it is possible to accurately recognize the current operation mode and edit the operation mode without an operation error.

As described above, in the VTR, even in the stop mode in which the tape running is stopped, the pause in the recording or reproduction mode, that is, whether the mode is the pause mode or the normal stop mode is determined. Since it is difficult to understand at a glance, it is possible to prevent an erroneous operation by changing the backlight color according to each operation mode to inform the user of the type of stop mode.

Further, even if the tape is running, the user can know what operation mode it is in, so that the subsequent operation can be executed without fail.

For example, as a mode for running a tape, in addition to a normal recording / reproducing mode and a fast-forward / rewind mode, when a cassette is mounted on a VTR, a cassette type, a cassette number, and a remaining tape amount are detected. There are playback modes and the like that are automatically set, and it is possible to make settings so that the backlight color is changed with them.

The effects of the embodiment of the present invention can be summarized as follows. (1) R, G, B three primary color light source drive signals output from the RGB control unit 13A to the drive output unit 18A, and 3
On the basis of the relationship between the color LEDs 19R, 19G, and 19B and the emission colors, the RGB control unit 13A controls the R, G, and B LEDs 1
By controlling the drive current of 9R, 19G, and 19B (or the light emission time by pulse driving), the backlight of the liquid crystal display panel 17 can emit multicolor. Therefore, it is also possible to make the backlight color desired by the user, or to change the backlight color gradually or sequentially over time.

(2) The coloring of the backlight of the liquid crystal display panel 17 is changed for each operation mode by storing the coloring content for each operation mode such as VTR playback, video recording, and video recording pause in the memory unit 15. Thus, the operation mode can be easily identified.

(3) By enabling the color content for each operation mode stored in the memory unit 15 to be freely set in a user setting area such as a function setting screen, the user can set a desired backlight color for each VTR mode. Can be selected and changed to color. In other words, it is possible to easily customize the backlight color of the liquid crystal display panel 17.

FIG. 3 shows a drive output unit 1 of a multi-color LED lighting control part in the display device of the electronic apparatus shown in FIG.
8A shows a circuit diagram of a configuration example of 8A. R, G, B each color L
The anodes of the EDs 19R, 19G, and 19B are connected to the DC power supply line + Vcc, and the cathode of the R-color LED 19R is connected to the reference potential point via the resistor r1 and the collector and emitter of the NPN transistor Q1 in series.
Is connected to a reference potential point via a resistor r2 and the collector and emitter of an NPN transistor Q2 in series.
The cathode of the color LED 19B is connected to the reference potential point via the resistor r3 and the collector / emitter of the NPN transistor Q3 in series. Then, the NPN transistors Q1,
The bases of Q2 and Q3 have R, G, and B signals as shown in, for example, FIGS.
By supplying a set of control outputs, the backlight emits a single color of red (FIG. 4), or the two colors are combined to produce yellow (FIGS. 5 and 6) or light blue (FIGS. 7 and 8). Or white light by combining three colors (Figs. 9 and 10)
And can emit light.

In each of FIGS. 4 to 10, (a) shows the R control output from the RGB control unit 13A, (b) shows the G control output, and (c) shows the B control output. ON / OFF of each color control output is determined by the drive transistor Q of each color shown in FIG.
1 means high and low signal levels for turning on and off Q2 and Q3. FIG. 4 shows a case in which the display color of the backlight is turned on, for example, with a single color of red among R, G, and B.
FIGS. 5, 7 and 9 show the case where two or three colors are combined and lighted synchronously with the same cycle and pulse width for two or three colors. Indicates a lighting method in the case where two or three colors are combined and lighted in a time-distributed manner for two or three colors.

FIGS. 4 to 10 show the temporal color unevenness and luminance change when each color LED is pulse-driven to produce the backlight, assuming that the brightness and the power consumption are constant in all the emission colors of the backlight. The lighting method shown in FIG.

Referring to FIGS. 5 to 10, three LEDs 1
When a plurality of LEDs out of 9R, 19G, and 19B are turned on to determine the emission color, the RGB control unit 13A determines that the sum of the emission times of the plurality of LEDs to be turned on per unit time is:
By controlling so that one LED in FIG. 4 is substantially the same as when all LEDs are lit, the power consumption and brightness of one LED can be reduced regardless of which color is generated in the multi-color lighting of the backlight. It can be almost the same as at the time of full lighting.

That is, with reference to FIGS.
The control unit 13A controls each color LED 19R,
The sum of the light emission times of 19G and 19B is controlled so as to be substantially the same regardless of the emission color, and the same brightness can be obtained with substantially the same amount of power for any of the colors.

As shown in FIGS. 5, 7 and 9,
In a case where each color lighting pulse has the same period and pulse width and is output in synchronization with time, three LEDs 19R,
When a plurality of LEDs out of 19G and 19B are turned on to determine the emission color, the RGB control unit 13A turns on the total emission time per unit time of the two-color LEDs 19R and 19G turned on in FIG. 5 and turns on in FIG. The sum total of the light emission times of the two-color LEDs 19G and 19B per unit time, and the number of lights 3 in FIG.
Even if the sum of the light emission times of the color LEDs 19R, 19G, and 19B per unit time is any of the light emission colors determined by the combined light emission of the color LEDs (yellow in FIG. 5, light blue in FIG. 7, white in FIG. 9). By performing control so as to be substantially the same, it is possible to obtain substantially the same brightness with substantially the same amount of power for all colors.

Similarly, as in the case of FIG. 6, FIG. 8 and FIG. 10, when the lighting pulses of the respective colors are output alternately dispersed in time, the three LEDs 19R, 19G,
In the case where a plurality of LEDs out of 19B are turned on to determine the emission color, the RGB control unit 13A uses the two-color LE turned on in FIG.
The sum of the light emission times of the D19R and 19G per unit time, the sum of the light emission times of the two-color LEDs 19G and 19B lit in FIG. 8, and the three colors L lit in FIG.
The sum of the emission times of the EDs 19R, 19G, and 19B in the unit time is any light emission color determined by the combined light emission of each color LED (yellow in FIG. 6, light blue in FIG. 8, white in FIG. 10). By controlling the colors so that they are the same, it is possible to obtain substantially the same brightness with substantially the same amount of power for any of the colors.

In the case of FIGS. 5, 7 and 9, the RGB control section 13A controls all the LEDs to be lit (R, R in FIG. 5).
G, G, B in FIG. 7, and R, G, B LEDs in FIG. 9)
, Pulse drive control is performed synchronously at a constant cycle and pulse width. When three colors are lit as shown in FIG. 9, the cycle and the pulse width are the same for the lighting pulses of all the colors.
For ED, pulse drive is performed synchronously, and LE of another color is
D may be pulse-driven asynchronously with the two-color LED.

Also, in the case of FIG. 6, FIG. 8 and FIG.
The B control unit 13A controls each LED to be turned on (R, G in FIG. 6, G, B in FIG. 8, and R, G, B in FIG. 10).
For ED), pulse driving control is performed by dispersing the lighting pulses of each color within a unit time so as to be output alternately in time. In this way, each color LE is dispersed in time.
When D is pulse-driven, temporal color unevenness and luminance change can be eliminated.

FIG. 11 is a circuit diagram showing another example of the configuration of the drive output section 18A of the multicolor LED lighting control section in the display device of the electronic apparatus shown in FIG. R, G, B
The anodes of the LEDs 19R, 19G, and 19B are connected to a DC power supply line + Vcc. The cathode of the LED 19R is connected to a reference potential point via the collector and emitter of an NPN transistor Q11 and a resistor r11 in series.
The cathode of D19G is connected to the reference potential point via the collector / emitter of NPN transistor Q21 and resistor r21 in series, and the cathode of B LED 19B is connected to the collector / emitter of NPN transistor Q31 and resistor r31 in series. Connected to the potential point. The base of the NPN transistor Q11 has the R control signal from the RGB control unit 13A.
By supplying a control output (pulse voltage) via an integrating circuit (r12, C11) and a resistor r13 connected in parallel with the integrating circuit (r12, C11), R
The drive DC voltage smoothed (converted to DC) according to the pulse width of the control output is supplied to the base of the transistor Q11. Similarly, NPN transistor Q21
The G control output (pulse voltage) from the RGB control unit 13A is supplied to the base through an integrating circuit (r22, C12) and a resistor r23 connected in parallel with the G control output, thereby responding to the pulse width of the G control output. The drive DC voltage smoothed (converted to DC) is supplied to the base of the transistor Q21. Similarly, the B control output (pulse voltage) from the RGB control unit 13A is supplied to the base of the NPN transistor Q31 via the integration circuit (r32, C13) and the resistor r33 connected in parallel with the base, thereby providing G The drive DC voltage smoothed (converted to DC) according to the pulse width of the control output is supplied to the base of the transistor Q31.

In this case, the transistors Q11, Q21, Q31
Are used in the non-saturation region, and transistors Q11, Q21, Q31 are used in accordance with the level of the drive DC voltage supplied to the base.
Collector currents (ie, LED19R, LED19G,
The drive current of each LED 19B) is varied between high and low, and R
Color LED 19R, G color LED 19G, B color LED 19B
It is possible to change the color saturation of each color by changing the amount of each light emission, and to change the hue and color saturation at the time of three-color synthesis. That is, the transistors Q11, Q21, and Q31 function as variable resistors whose resistance values change according to the base voltage.

In FIG. 11, by controlling the pulse width of the R, G, B control output output from the RGB control section 13A, the base of each color drive transistor Q1, Q2, Q3 is controlled according to the pulse width. Each color LED to supply
When the drive voltage changes, each color LED 19
By controlling the amount of each drive current flowing through the R, LED 19G, and LED 19B, the brightness and power consumption of each color LED can be controlled.

In the configuration of FIG. 11, similarly to the control based on the light emission time of FIG. 3, the three LEDs 19R, 19G, 1
In the case where a plurality of LEDs among the LEDs 9B are turned on to determine the emission color, the RGB control unit 13A determines that the total drive current of the plurality of LEDs to be turned on per unit time is one LED.
By controlling the LED drive voltage of each color so that it is almost the same as when all the LEDs are lit, the power consumption and brightness can be reduced by one LED regardless of which color is generated in the multi-color backlight. It can be almost the same as when lighting.

That is, the RGB control unit 13A controls the LED drive voltages of the respective colors so that the sum of the drive currents of the LEDs of the respective colors per unit time is substantially the same regardless of the emission color. Can have almost the same brightness with almost the same amount of power. Also in this case, by using the lighting pulses shown in FIGS. 4 to 10 as the respective color control outputs from the RGB control unit 13A, as a result, the sum of the LED drive currents of the respective colors becomes substantially the same regardless of the backlight emission color. can do.

The three LEDs 19R, 19G, 19
In the case where a plurality of LEDs of B are turned on to determine the emission color, the RGB control unit 13A determines which emission color is determined by the combined emission of each color LED in a unit time, the sum of the drive current of each color LED to be turned on. In this case, by controlling the LED drive voltages of the respective colors so as to be substantially the same, it is possible to obtain substantially the same brightness with substantially the same amount of power for any color.

The drive current control (drive current switching) in FIG. 11 is performed by controlling the pulse width of each of the R, G, and B color control outputs from the RGB control unit 13A. R, G, B each color LE
A plurality of series-connected sets of series circuits of resistors and switching transistors are connected between the cathodes of D19R, 19G, and 19B and the reference potential point. The drive current control resistance value connected in series to each color LED 19R, 19G, 19B may be changed depending on how many are turned on, thereby controlling each drive current of each color LED 19R, 19G, 19B.

In the embodiment described above, the three primary colors R,
Although the respective color LEDs 19R, 19G, and 19B for G and B light emission are used as three primary color light sources, the present invention is not limited to this, and a configuration using three primary color R, G and B light emission fluorescent lamps as the three primary color light sources. It is also possible to use

[0086]

As described above, according to the display device of the electronic apparatus of the present invention, the function of switching the backlight emission color of the liquid crystal display according to each operation mode of the electronic apparatus can be realized. Can freely set the emission color. This makes it possible to confirm the current operation state of the device by the color of the emitted light of the backlight, thereby reducing operation mistakes when switching the operation mode by remote control and improving the operability.

Further, according to the multicolor light source lighting control device of the present invention, the brightness and power consumption of the entire multicolor light source can be made constant.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a display device of an electronic device according to an embodiment of the present invention.

FIG. 2 is a view showing a setting screen of a multi-color setting mode provided on an on-screen function setting screen in the device of FIG. 1;

FIG. 3 is a circuit diagram showing a configuration example of a drive output unit of a multicolor LED lighting control unit in the display device of the electronic apparatus in FIG. 1;

FIG. 4 is a view showing an example of an LED lighting control output signal in the display device of the electronic apparatus in FIG. 1;

FIG. 5 is a view showing an example of an LED lighting control output signal in the display device of the electronic apparatus in FIG. 1;

FIG. 6 is a view showing an example of an LED lighting control output signal in the display device of the electronic apparatus in FIG. 1;

FIG. 7 is a view showing an example of an LED lighting control output signal in the display device of the electronic apparatus in FIG. 1;

FIG. 8 is a view showing an example of an LED lighting control output signal in the display device of the electronic apparatus in FIG. 1;

FIG. 9 is a view showing an example of an LED lighting control output signal in the display device of the electronic apparatus in FIG. 1;

FIG. 10 is a view showing an example of an LED lighting control output signal in the display device of the electronic apparatus in FIG. 1;

FIG. 11 is a circuit diagram showing another configuration example of the drive output unit of the multicolor LED lighting control unit in the display device of the electronic apparatus in FIG. 1;

FIG. 12 is a block diagram showing a backlight device in a conventional VTR.

[Explanation of symbols]

10A: microcomputer 12: mode setting unit 13A: RGB control unit 15: memory unit (storage unit) 17: liquid crystal display panel 19R, 19G, 19B: LEDs for three primary colors R, G, B
(Three primary color light sources) 20 Remote controller (operation unit) 21 Keyboard (operation unit)

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09G 3/20 650 G09G 3/20 650M 3/34 3/34 J F-term (Reference) 2H093 NA65 NC13 NC14 NC16 NC43 NC44 ND01 ND60 NG01 5C006 AB03 AF51 AF54 AF69 BB29 BF15 BF36 EA01 5C080 AA10 BB01 BB05 DD09 DD30 EE30 JJ02 JJ03 JJ04 KK43

Claims (23)

[Claims] 1. A liquid crystal display panel, a light source of three primary colors used as a backlight of the liquid crystal display panel, a mode setting section for setting various operation modes of the device, and a memory for storing color setting contents for each operation mode. The color of the backlight is changed for each operation mode by individually controlling the three primary color light sources by referring to the color setting contents of the storage unit according to the operation mode set by the mode setting unit. And a RGB control unit for controlling the display device. 2. A liquid crystal display panel, a light source of three primary colors used as a backlight of the liquid crystal display panel, a mode setting section for setting various operation modes of the device, and a memory for storing color setting contents for each operation mode. The color of the backlight is changed for each operation mode by individually controlling the three primary color light sources by referring to the color setting contents of the storage unit according to the operation mode set by the mode setting unit. And a mode color setting unit for arbitrarily selecting a backlight color for each of the operation modes and storing the selected color in the storage unit based on an instruction from the operation unit. Characteristic display device for electronic equipment. 3. The mode setting section can set a demonstration mode based on an instruction from an operation section, and the RGB control section sets a backlight when the mode setting section sets the demonstration mode. 3. The display device for an electronic device according to claim 1, wherein the display device is controlled so as to automatically and sequentially change the colors. 4. The apparatus further comprises setting means for setting whether or not to operate the demonstration mode, wherein the RGB control section turns off the power of the device while the demonstration mode is set in the setting means. 3. The display device for an electronic device according to claim 1, wherein when the display device is turned on, the demonstration mode is executed, and control is performed such that the color of the backlight is automatically and sequentially changed. 5. When the device is a VTR, the mode color setting means stores a function setting screen information for on-screen, and stores the function setting screen information for on-screen in a television receiver. OS that enables screen selection and color selection for each operation mode based on instructions from the operation unit
3. The display device for an electronic device according to claim 2, comprising a D control unit. 6. The display device for an electronic device according to claim 2, wherein the color selection for each operation mode in said mode color setting means is made identifiable by changing a set color between confusing operation modes. . 7. The display of an electronic device according to claim 2, wherein the mode color setting means fixes a specific operation mode to a specific color in advance and disables an arbitrary color selection. apparatus. 8. The electronic device according to claim 1, wherein the RGB control unit controls the sum of the light emission times of the respective color light sources in a unit time to be substantially the same regardless of the emission color. Equipment display device. 9. When the plurality of light sources among the three primary color light sources are turned on to determine a light emission color, the RGB control unit determines that the total light emission time of each color light source to be turned on is a combined light emission of each color light source in a unit time. The display device for an electronic device according to claim 1, wherein the control is performed such that the emission colors are substantially the same regardless of the determined emission color. 10. When the plurality of light sources among the three primary color light sources are turned on to determine a light emission color, the RGB control unit controls a pulse drive having a constant period and a constant pulse width for a part or all of the light sources to be turned on. The display device for an electronic device according to claim 1, wherein the display device performs control. 11. When the plurality of light sources among the three primary color light sources are turned on to determine a light emission color, the RGB control unit determines that the sum of the light emission times of the plurality of light sources to be turned on per unit time is one light source. 9. The display device of an electronic device according to claim 8, wherein the display is controlled so as to be substantially the same as the case of lighting. 12. The electronic apparatus according to claim 10, wherein the RGB control unit outputs, for each color light source to be turned on, each color lighting pulse in a unit time by the pulse driving in a time-dispersed manner. Display device. 13. The color light source drive voltage according to claim 1, wherein the RGB control unit controls the drive voltage of each color light source so that the sum of the drive current of each color light source per unit time is substantially the same regardless of the emission color. Or the display device of the electronic device according to 2. 14. When the plurality of light sources among the three primary color light sources are turned on to determine the emission color, the RGB control unit determines that the sum of the drive currents of the respective color light sources to be turned on is the combined light emission of each color light source in a unit time. 3. The display device of an electronic device according to claim 1, wherein the driving voltages of the respective color light sources are controlled so as to be substantially the same in any of the determined emission colors. 15. When the plurality of light sources among the three primary color light sources are turned on to determine the emission color, the RGB control unit determines that the sum of drive currents of the plurality of light sources to be turned on per unit time is one light source. 14. The display device for an electronic device according to claim 13, wherein the driving voltages for the respective color light sources are controlled so as to be substantially the same as the case of lighting. 16. The three primary color light sources and the three primary color light sources are individually controlled to change the emission color, so that the total emission time of each color light source per unit time is substantially the same regardless of the emission color. And an RGB control unit for controlling the multi-color light source lighting control device. 17. A three-primary-color light source, and a light-emitting color is changed by individually controlling the three-primary-color light sources. When a plurality of light sources among the three-primary-color light sources are turned on to determine a light-emitting color, each color light source to be turned on is determined. An RGB control unit for controlling the total sum of the light emission times to be substantially the same for any light emission color determined by the combined light emission of each color light source per unit time. Control device. 18. A three-primary-color light source, and a light-emitting color is changed by individually controlling the three-primary-color light sources. When a plurality of light sources among the three-primary-color light sources are turned on to determine a light-emitting color, each color light source to be turned on is determined. And a RGB control unit that performs pulse drive control with a constant period and a constant pulse width for a part or all of the multi-color light source lighting control device. 19. A three-primary-color light source and a light-emitting color that is changed by individually controlling the three-primary-color light sources. An RGB control unit that controls the sum of the light emission times of a plurality of light sources to be substantially the same as when one light source is fully lit. 20. The apparatus according to claim 1, wherein said RGB control unit temporally disperses each color lighting pulse in a unit time by said pulse driving for each color light source to be lighted.
9. The multicolor light source lighting control device according to 8. 21. The three primary color light sources and the three primary color light sources are individually controlled to change the emission color, so that the sum of the drive current of each color light source per unit time is substantially the same regardless of the emission color. An RGB control unit that controls each color light source driving voltage, and a multi-color light source lighting control device. 22. A three-primary-color light source and a light source for changing a light-emitting color by individually controlling the three-primary-color light sources. An RGB control unit that controls each color light source drive voltage such that the sum of the drive currents is substantially the same for any emission color determined by the combined emission of each color light source per unit time. Multi-color light source lighting control device. 23. A three-primary-color light source, and a light-emitting color is changed by individually controlling the three-primary-color light sources. When a plurality of light sources among the three-primary-color light sources are turned on to determine a light-emitting color, the light is turned on in a unit time. And a RGB control unit for controlling each color light source drive voltage so that the sum of drive currents of a plurality of power sources is substantially the same as when one light source is fully lit. apparatus.