JPS63173024A - Display device - Google Patents

Abstract

PURPOSE:To adjacently arrange a liquid crystal display image and a transmis sion display image by forming the transmission display image in a light transmis sion region for driving the negative liquid crystal segment of a liquid crystal display constitution. CONSTITUTION:On the liquid crystal panel 10 of a position of an opening part 20-1 being a liquid crystal display image region 25, a segment 10a for a squarish 8-shaped variable numerical display and a segment 10b for a mark display are formed, and on the other hand, in the position of an opening part 20-2 being a transmission display image region 27, a segment 10c for a circular light transmission is formed. Also, a segment 10c for the size of the light trans mission is set so as to be larger than the region (area) of the opening part 20-2, and each segment 10a-10b shields a light beam in the same way as other region from a characteristic of a negative type liquid crystal at the time of non-electric conduction, and at the time of electric conduction, only the region of its segments 10a-10c becomes a light transmission state and visual reading of a display can be executed. In such a way, a liquid crystal display image and a transmission display image can be placed adjacently.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a display device in which a light emitting element structure such as an LED is disposed on the rear surface of a negative type liquid crystal display structure.

[Conventional technology]

As a similar conventional display device, we applied it to a single-lens reflex camera so that both the transparent display image obtained by illuminating the light-transmitting mark member with LED (light-emitting diode) light and the liquid crystal display image can be observed in the viewfinder. In addition, in order to match the diopter of the liquid crystal display image and the translucent display image, a transmissive display window is placed in the optical path of the liquid crystal display device, and a light transmissive mark part that forms the translucent display image. An application has been filed for one formed in conjunction with a common mask member (Utility Model Publication No. 60-181738).

However, even if it is shared with the mask member in this way, if the liquid crystal display image area of the liquid crystal display panel is configured to have the same horizontal length as the horizontally long part of the mask member, the liquid crystal seal of the liquid crystal display panel will inevitably be damaged. The translucent display image must be separated from the liquid crystal display image by the width of the stop. In order to solve this problem, the liquid crystal display section of the liquid crystal display panel is configured to be horizontally long and approximately the same length as the mask member, and the transmissive display image is illuminated by the light that has passed through the liquid crystal display section. It is also possible to do something like this. however,
This method is effective when the liquid crystal is in a positive display (all parts other than the segment electrodes are always in a light transmitting state), but cannot be implemented in the case of a negative display (all parts other than the segment electrodes are always in a light transmitting state).

By the way, FIG. 6 shows the structure of a display device in a viewfinder using a liquid crystal display panel, which is conventionally used in cameras. 57 is a triangular prism bonded to the pentaprism 51, 58 is two reflective mirrors, 59 is a liquid crystal panel, and 60 is a lighting prism superimposed on the liquid crystal panel 9, which provides illumination light from an illumination LED 61 and lighting provided on the top lid 63. Natural light from the window 62 is guided to the liquid crystal panel 59 for illumination. 52 is a focusing glass, 53 is an eyepiece lens, 54 is a pentaprism 51 and a focusing glass 52
holder, 55 is a field mask, 56 is a focusing glass 5
2 and the pentaprism 51. In such a configuration, when photographing outdoors during the day, the liquid crystal panel 59 is illuminated with natural light, and the display contents of the liquid crystal panel 59 are displayed in the viewfinder. On the other hand, when the outside light is of low brightness, such as indoors or at night, the illumination LED 61 is made to emit light to illuminate the liquid crystal panel 59, and a similar display is performed. The illumination LED 61 can be operated arbitrarily by an external switch, or can be automatically caused to emit light when the brightness is low based on brightness information of outside light.

This configuration requires a large number of optical system parts for display within the viewfinder, and because the optical path length is long, a position adjustment mechanism for the liquid crystal panel is required, making it extremely complex, large in shape, and expensive. Furthermore, the need for lighting windows was a constraint on the design. Therefore, it is conceivable to place a light emitting element behind the liquid crystal display panel and constantly illuminate the liquid crystal display panel with the tip of the light emitting element to display images, but the illumination capacity is lower compared to the case of using outside light during the day as mentioned above. Since the visibility is weak, it is necessary to improve visibility as much as possible, and one possible means for achieving this is to use a negative liquid crystal display. In this case as well, the problem of the distance between the transparent display image and the liquid crystal display image as described above occurs.

In addition, when a transmissive display image that transmits through the liquid crystal display section and displays τ'' is configured as described above, if this transmissive display image is required to have a fast response, there is a problem that the response is delayed, especially at low temperatures due to the characteristics of the liquid crystal. A problem arises in that there are dots on the screen, impairing its function as a display device.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a display device that allows a liquid crystal display image and a translucent display image to be brought close to each other, and also solves the problem of responsiveness caused by a liquid crystal display.

〔Example〕

This invention will be explained in detail.

FIG. 1 shows an image of a negative type liquid crystal panel 1o placed on the bottom viewfinder side of a pentaprism 1 using an LED chip 14.
2 shows a cross section of the display device in the viewfinder of an m-reflex camera, which is illuminated with light and introduced into the pentaprism 1 from the bottom surface of the pentaprism 1 through the triangular prism 6. 3 is an eyepiece lens, 4 is a holder for the pentaprism 1 and the focusing glass 2, 5 is a field frame, 7 is a spacer that also serves as a holder for the triangular prism 6, 11 and 12 are on both sides of the liquid crystal panel 10 Polarizing plates 13 are arranged on the front and back (front and back based on the light transmission direction), and 13 is an LED chip 14 (chip 14a).
~14d and chip 14e) mounted LED board, 1
5 is a light shielding frame, 16 is an elastic conductive connector disposed between the flexible substrate 18 and the electrode portion of the liquid crystal panel 10, and 17 is a holder for holding the liquid crystal panel 10, the LED board 13, etc. as a unit. Reference numeral 19 denotes two base plates, with the holder 17, flexible substrate 18, and liquid crystal panel 10 sandwiched between them as shown in the figure and tightened with screws, and the conductive connector 16
The conductive pattern on the flexible substrate 18 and the electrode portion of the liquid crystal panel 10 are electrically connected by this.

2(a) and 2(b) are enlarged views of the liquid crystal panel portion of the display device in the viewfinder of FIG. 1. FIG. 2° is LCD panel 1
A rectangular opening 2°-1 that opens a liquid crystal display image area 25 that displays exposure information and a transmissive display image area 2 that displays focus information using a metal mask as a mask member deposited on
A circular opening 20-2 opening 7 is formed.

Here, on the liquid crystal panel 10 at the opening 20-1 position as the liquid crystal display image area 25, a Japanese character-shaped variable number display segment 10a and a mark display segment 10b are formed. opening 20-2
A circular light transmitting segment 10c is formed at the position. Each of these segments 10a to 10c is formed as shown in FIG. 2(C), which is an enlarged view of the main part, and it is particularly important that the size of the light transmission segment 10c is larger than the area (area) of the opening 20-2. Other than that, as is generally known, each segment 10a to 10b is set to a large area when not energized due to the characteristics of a negative type liquid crystal. Similarly, light is blocked, and when electricity is applied, only the areas of the segments 10a to 10c become light transmitting, allowing visual reading of the display. Note that the LED chips 14a to 14e provided on the LED substrate 13 are for illuminating the liquid crystal display image area 25 located in the opening 2o-1, and therefore the chips 14a to 14d are for illuminating the liquid crystal display image area 25 located in the opening 2o-1. It is arranged at a position that does not overlap with 10b.

On the other hand, the LED chip 14e on the LED board 13 is itself a self-luminous element for transmissive display, and the opening 2
It is disposed at a position overlapping the light transmission segment 10c located at 0-2.

The light shielding frame 15 is configured to surround both areas 25 and 27, and prevents the light emitted from the LED chips 14a to 14d from leaking into the area 27, and prevents the light emitted from the LED chip 14e from leaking into the area 25. I try not to leak it.

FIG. 3 is a block diagram of the camera system.

SWt is a photometry switch that is turned on prior to the operation of this display device, SW2 is a release switch that starts exposure control of the camera, and 22 is a switch that determines the status of the photometry switch SWt and release switch SW2, and a power source from the battery 21. DC70C provided to maintain the voltage at a value higher than a certain voltage
A microcomputer with a function of generating an output voltage from the converter 24, which serves as the CPU of this camera system, the microcomputer 23, and the LCD decoder driver 32 and LCD decoder driver 33 that drive the liquid crystal panel of this display device. D.C.
The output voltage from the 70C converter 24 is supplied to each drive state. 27 indicates a block part of an automatic focus detection circuit, 25 is a CCD serving as a distance measurement sensor, 26 is a distance measurement IC that converts the image signal from the CCD 25 into A/D, and the microcomputer 23 and distance measurement information are connected to each other. In response to this communication, the microcomputer 23 communicates a control signal to a focus adjustment mechanism of a photographing lens (not shown). 29 is a photometric photodiode;
The photocurrent generated in response to external light is subjected to logarithmic compression of the current-voltage output using the photometric amplifier 30, and then A/D conversion is performed using the AD converter 31, and the luminance information of the photographed subject is transferred to the microcomputer. Send to 23rd. Furthermore, the microcomputer 23 reads film sensitivity information from the film's DX code detector 36, performs exposure calculations based on this and brightness information, and determines exposure information for controlling the exposure mechanism of the camera. The LCD decoder driver 32 receives the exposure information from the microcomputer 23 and displays the exposure information on the segments 10a, 10 of the liquid crystal display image area 25.
Drive b. The light transmitting segment 10c of the light transmitting display image area 27 is driven by the LCD decoder driver 33 to bring the area of the segment 10c into a light transmitting state. 1
Exposure information illumination LEDs 4a to 4d constitute one illumination light emitting unit, each of which is connected in parallel. Reference numeral 14e denotes an LED for displaying focus discrimination of the automatic focusing mechanism, which is turned on when transistors Tr, Tr2, which are operated by the AF drive signal (output port OP2.3) of the microcomputer 23, are turned on. Further, 37 is a motor for film feeding and shutter charging, 38 is a magnet for controlling the tension of the front curtain of the shutter, and 139 is a magnet for controlling the tension of the rear curtain of the shutter. )! , :transistor Tr3. Tr4. It is driven by turning on Trs, and performs film feeding, shutter control, etc.

Control flowcharts of the microcomputers 22 and 23 in the camera system as described above are shown in FIGS. 4 and 5, and the circuit operation will be explained using these. FIG. 4 shows a flowchart of the microcomputer 22 and the above-mentioned switch SWI.

This is used to determine the state of SW2, and when switch SW1 is ON
When detected, step 1 branches to step 3. In step 3, flag A indicating the state of switch SWI is
However, when the current state A=O (SWI=ON), the process goes to step 6, and when the flag A is the current state A=1 (SW1=OFF) (7), the process branches to step 4, and in this step 4, the club The process further branches to step 6 by setting A=0.

On the other hand, if switch SWI is detected to be OFF in step 1, the process branches to step 2, where the current flag A is set to A.
When the flag A is A=1 (SW1=OFF), the process proceeds to step t, and when the flag A is A=O (SWI=ON), the process branches to step 6 with the flag A=1 in step 5.

When the ON state of the switch SW2 is detected in step 7, the process branches to step 9, and when the switch SW2 is detected to be OFF, the process branches to step 8. In step 9, if flag B indicating the state of switch SW2 is currently B=O (SW2=ON), step 12 is executed.
When the flag B is currently B=1 (SW2=OFF), the process branches to step 10, and in step 10, the flag B=0 and the process further branches to step 6.

In step 6, the output port OPI of the microcomputer 22 is set to a high level to turn on the DC/DCC/type converter 24.

On the other hand, if switch SW2 is detected to be OFF in step 7, the process branches to step 8, where the current flag B is set to
=1 (SW2=OFF), go to step 12; when flag B is B=O (SW2=ON), go to step 11
At this point, the flag B is set to 1 and the process branches to step 6.

In step 12, the state of the output port OPI of the microcomputer 22 is determined, and if a high level output is generated, the process branches to step 13, and if a low level output is generated, the process branches to step 1.

In step 13, the contents of the flags A and B are sent to the microcomputer 23, which is already turned on.

In step 14, the D
The control command for the C70C converter 24 is received.

In step 15, if the instruction from the microcomputer 23 is an instruction to turn off the DC70C converter 24, the process branches to step 16; if no off instruction has been issued, the process branches to step 1.

In step 16, from the microcomputer 23
Since the command to turn off the C70C converter 24 has been issued, a low level signal is output to the output port OP1 of the microcomputer 22, and the DC/DCC converter 24 is turned off. Then, return to step 1.

Next, the operation of the microcomputer 23 will be explained with reference to FIG.

The microcomputer 23 shown in FIG. 4 is a DC/D converter using the microcomputer 22 shown in FIG.
The operation is started when power is supplied under the operation control of the CC/type controller 24.

[Step 20] Upon receiving the power supply from the D C/DC converter 24, first, a command is issued to the LCD decoder driver 33 to operate, and the light transmitting segment 10c of the transparent display image area 27 is driven. , the segment 10c as a negative liquid crystal segment is brought into a light transmitting state.

[Step 21] Communicating with the microcomputer 22 to switch SWI,
Data of flags A and B representing the state of SW2 is received.

[Step 22 Check the status flag A of the switch SWI, and if the switch SWI is ON (A=O), go to Step 24;
If FF A=1, the process branches to step 23.

[Step 23 Check the status flag B of the switch SW2, and if the switch SW2 is ON (B=O), the process branches to step 24; if the switch SW2 is OFF, B=1, the process branches to step 40, and the microcomputer D C/D C for 22
END processing is performed by outputting a command to turn off (non-drive) the converter 24.

[Step 24] The brightness information of the subject to be photographed is received from the A/D converter 31, and the film sensitivity information of the loaded film is received from the film DX code detector 36.

[Step 25] Exposure calculation is performed based on brightness information, film sensitivity information, other camera mode selection information, shooting value set information, etc. In the case of program control, shutter speed and aperture value are calculated.
In shutter priority AE, the aperture value is determined, and in aperture priority AE, the shutter speed is determined.

[Step 26] Status flag B of switch SW2 that detects release operation
When flag B=1 (SW2 is 0FF), the process branches to step 27, and when flag B=0 (SW2 is ON), the process branches to step 36. In the case of normal photography, the flow of the first flowchart after the microcomputer 23 starts operating is step 27 with flag B=1.
Since the process branches to step 27, the flow from step 27 onwards will be explained.

[Step 27] Display data (for example, the aperture value determined in step 25) is output to the LCD decoder driver 32, and the segments 10a and 10b of the liquid crystal display image area 25 for displaying exposure information are driven.

[Step 28 Start timer #1.

[Step 29] The defocus amount of the photographing lens is calculated by communicating with the distance measuring IC 26.

[Step 30] A command is output to the photographing lens to rotate the AF drive motor and perform a focusing operation.

[Step 31 Check the timer #1 timer one hour elapsed state,
When 0 m5 has passed, the process branches to step 32, and when 100 m5 has not yet passed, the process branches to step 33.

[Step 32] Output a high level signal to the output boat oP2 to turn on the transistor Tr, and turn on the exposure information illumination LED 14a-
d is turned on, segment 10a of liquid crystal display image area 25
, 10b are made visible in the finder.

[Step 33 Check whether the photographic lens is in focus, and if it is in focus, go to step 34, if it is out of focus, go to step 3
Branch to 5.

[Step 34] A high level signal is output to the output boat OP3 to turn on the transistor Tr2 and light up the focus determination LED 14e. As a result, a lighted transmission image is displayed in the opening 2o-2 of the metal mask 20 through the segment 10c, which has already been driven to the light transmission state, and the in-focus state can be visually confirmed in the finder.

[Step 35] Output a pulse signal to the output port OP3 and output the transistor T.
Repeat 0N-OFF of r2, focus determination LED14e
flash. From this, a blinking transmission image is displayed in the opening 20-2 of the metal mask 20 through the segment 10c, and the out-of-focus state can be visually recognized in the finder. 11. In steps 27 to 35, the characteristic feature is that the display state of the transparent display image is changed, such as lighting and non-lighting of the focus determination LED 14e and blinking once, to achieve focus.

Distance measurement non-operation and non-focus are displayed. On the other hand, the exposure information illumination LED 14aNd functions as illumination of the liquid crystal segment 10a and IQb, so the focus display that requires quick response depends on the characteristics of the liquid crystal. Complex exposure display can be performed on the liquid crystal display without deteriorating the display function such as delay in response at low temperatures due to dependence on the responsiveness of the LED.

Note that after passing through the flowchart of steps 27 to 35 up to this point, the process returns to step 21, and by repeating the flow again, new exposure information and focus information such as changes in subject brightness can be visually confirmed in the finder.

Next, the photographer checks the exposure information and focus information in the viewfinder, then moves on to the shooting operation, presses the second stroke of the release button, turns on switch SW2, and sets flag B=O. Step 3
Perform the following actions.

[Step 36] A command is output to the lens to drive the aperture drive motor in the lens to narrow down the aperture value to the aperture value calculated in step 25.

[Step 37] After the narrowing down operation and mirror up operation are completed, a high level signal is applied to the output port OP4 for a predetermined period of time (for example, 10m5).
), and during that time transistor Trs is turned on,
The front curtain tensioning magnet 38 is driven to move the shutter front curtain and start exposure.

[Step 38] Wait for the shirt time calculated in step 25.

[Step 39] Output a high level signal to the output port OPS for a predetermined period of time (for example, 10m5), and during that time, the transistor UTATr4
is turned on, the trailing curtain tensioning magnet 39 is driven, the shutter trailing curtain is moved, and exposure is completed.

[Step 40] A high level signal is output to the output port OP6 for a predetermined period of time (for example, 300 m5), during which time the transistor Tr5 is turned on to drive the motor 37 for shutter charging and film winding in preparation for photographing the next frame.

Thereafter, each time the switch SW2 is turned on during photographing, a series of steps 36 to 40 is performed.

〔Effect of the invention〕

As explained above, in the present invention, since the transmissive display image is formed in the light transmissive area where the negative liquid crystal segment of the liquid crystal display structure is driven, the liquid crystal sealing part is formed between the liquid crystal display image and the transmissive display image. Because there is no image, both images can be placed close together, and furthermore,
In order to form the light transmission area of the transmissive display image, the negative uses the driving of the liquid crystal segment, but the negative starts driving the liquid crystal segment before the lighting control of the light emitting element that actually creates the light of the transmissive display image. However, since the transmissive display image is created by controlling the lighting of the light emitting element in a continuous drive mode, a display device is provided which is capable of displaying with fast response without depending on the response of the liquid crystal at low temperatures. do.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part when a display device as an embodiment of the present invention is incorporated into a single-lens reflex camera. FIG. 2(a) is a side view of only the display device, FIG. 2(b) is a plan view thereof, and FIG. 2(c) is an enlarged plan view of the main part. FIG. 3 is a circuit diagram of a camera system incorporating the display device of this embodiment. 4 and 5 are flowcharts showing the circuit operation of FIG. 3. FIG. 6 is a sectional view of a main part of a single-lens reflex camera showing a conventional display device. 10 ------------One liquid crystal panel 14a ~
14e-LED chip 20 ------- Metal mask 25 ---
----1------Liquid crystal display image area 27------
---1-- Transparent display area 22, 23 ---1-
- Microcomputer 32.33 ---- L
CD decoder driver (α)

Claims (1)

[Claims] (1) Consists of a negative type liquid crystal display configuration, a light emitting element configuration arranged on the rear surface of the liquid crystal display configuration, and a control for controlling the operation of both configurations. The first method provides display formats such as
and a second display section for forming a transmissive display area by continuously driving the segments, and the light emitting element configuration includes an illumination device disposed at a position corresponding to the first display section. and a second light emitting element for operation display disposed at a position corresponding to the transmissive display area formed by driving the segments of the second display section; A display device according to claim 1, wherein the control means includes a control circuit that drives the segments of the second display section to form a transmissive display area before controlling the drive of the second light emitting element.