JPH0353257Y2 - - Google Patents
Info
- Publication number
- JPH0353257Y2 JPH0353257Y2 JP2162084U JP2162084U JPH0353257Y2 JP H0353257 Y2 JPH0353257 Y2 JP H0353257Y2 JP 2162084 U JP2162084 U JP 2162084U JP 2162084 U JP2162084 U JP 2162084U JP H0353257 Y2 JPH0353257 Y2 JP H0353257Y2
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- emitting element
- display
- switch
- nand gate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000005286 illumination Methods 0.000 claims description 12
- 239000004973 liquid crystal related substance Substances 0.000 claims description 12
- 238000010586 diagram Methods 0.000 description 5
- 102100040844 Dual specificity protein kinase CLK2 Human genes 0.000 description 3
- 101000749291 Homo sapiens Dual specificity protein kinase CLK2 Proteins 0.000 description 3
- 102100040862 Dual specificity protein kinase CLK1 Human genes 0.000 description 2
- 102100040856 Dual specificity protein kinase CLK3 Human genes 0.000 description 2
- 101000749294 Homo sapiens Dual specificity protein kinase CLK1 Proteins 0.000 description 2
- 101000749304 Homo sapiens Dual specificity protein kinase CLK3 Proteins 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004313 glare Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Description
【考案の詳細な説明】
〈考案の属する分野〉
本考案は野外等で昼、夜にわたり使用される表
示装置の視認性向上と発熱の改善に関する。[Detailed description of the invention] <Field to which the invention pertains> The present invention relates to improving the visibility and heat generation of a display device used outdoors during the day and night.
〈従来技術〉
従来液晶と発光素子（発光ダイオード、ランプ
等）とを用いた表示装置では、夜間屋外で使用す
る際には液晶の文字を照明する発光素子を液晶裏
面より点灯させて液晶の表示の視認性向上を図る
場合が多い。このような表示装置では、表示用発
光素子は昼間でも判読できるだけの輝度を保つに
十分な電流が供給されるので、夜間の屋外使用の
際、周囲が暗いためにまぶしすぎる場合が多い。
又消費電力も夜間には上記したように液晶照明用
の発光素子が使用されるので、計器の内部温度が
上昇して信頼性に悪影響を及ぼしていた。<Prior art> Conventional display devices using liquid crystals and light emitting elements (light emitting diodes, lamps, etc.) have been used outdoors at night by lighting up the light emitting elements that illuminate the characters on the liquid crystal from the back of the liquid crystal. In many cases, the aim is to improve visibility. In such display devices, sufficient current is supplied to the display light-emitting elements to maintain a brightness that is readable even during the day, so when used outdoors at night, the surroundings are often dark and the display is often too bright.
In addition, as for power consumption, as the light emitting elements for liquid crystal lighting are used at night as described above, the internal temperature of the instrument rises, which has an adverse effect on reliability.
表示用発光素子の輝度を昼と夜で切換える方式
のものでも、独立した切換スイツチを設けて操作
していたため、切換え忘れが発生する問題があつ
た。 Even in systems that change the brightness of display light emitting elements between day and night, an independent changeover switch is provided and operated, resulting in the problem of forgetting to change the changeover.
〈考案の構成〉
本考案は上記問題点を解消することを目的とし
たものであつて、その構成上の特徴は、表示用発
光素子と、液晶表示手段と、この液晶表示手段を
照明するための照明用発光素子と、この照明用発
光素子の点灯を制御するためのスイツチ手段とを
有する表示装置において、上記スイツチ手段と連
動して上記表示用発光素子に供給される電流を切
換えるようにした点にある。<Structure of the invention> The present invention aims to solve the above problems, and its structural features include a display light emitting element, a liquid crystal display means, and a light emitting element for illuminating the liquid crystal display means. A display device having a light emitting element for illumination and a switch means for controlling lighting of the light emitting element for illumination, wherein the current supplied to the light emitting element for display is switched in conjunction with the switch means. At the point.
〈実施例〉
第１図は本考案の一実施例を示す構成図であ
る。１は表示用発光素子、２は液晶表示手段３を
裏面より照明する照明用発光素子、４は表示用発
光素子に直列に挿入された点灯制御スイツチ、５
はこのスイツチの制御手段である。６は照明用発
光素子の点灯を制御するスイツチ手段、７はこれ
と連動する切換えスイツチ手段で、両スイツチ手
段の切換片が共通接続されて電源Ｖに、スイツチ
手段７の一方の出力端子７aは抵抗R1を介して表
示用発光素子のアノードに接続され、他方の端子
７bは抵抗R1を介して一方の端子６aに接続されて
いる。スイツチ手段６の出力端子は抵抗R3を介
して照明用発光素子２のアノードに接続されてい
る。<Embodiment> FIG. 1 is a block diagram showing an embodiment of the present invention. 1 is a light emitting element for display; 2 is a light emitting element for illumination that illuminates the liquid crystal display means 3 from the back side; 4 is a lighting control switch inserted in series with the light emitting element for display; 5
is the control means for this switch. 6 is a switch means for controlling the lighting of the light emitting element for illumination, and 7 is a changeover switch means interlocked with this, the switching pieces of both switch means are commonly connected to the power supply V, and one output terminal 7 a of the switch means 7 . is connected to the anode of the display light emitting element via a resistor R1 , and the other terminal 7b is connected to one terminal 6a via a resistor R1. The output terminal of the switch means 6 is connected to the anode of the illumination light emitting element 2 via a resistor R3 .
図示のスイツチ手段６，７の切換状態は昼間の
使用状態を示し、表示用発光素子１は抵抗R1の
みの電流制限を受け、スイツチ４がオンの場合に
高輝度で点灯する。一方照明用発光素子２は消灯
状態である。夜間使用に際して、スイツチ手段６
をオン制御すれば、照明用発光素子２は抵抗R3
で制限される電流が供給されて発光し、液晶表示
手段３を照明すると共に、スイツチ手段７の切換
片７b側に接続されて表示用発光素子は（R1＋
R2）の抵抗による電流制限を受けて発光するの
で、昼間の輝度より低下する。抵抗R2の値は夜
間でもまぶしくない値に適当に選択して決定され
る。 The switching states of the switch means 6 and 7 shown in the figure indicate the daytime usage state, and the display light emitting element 1 is limited in current only by the resistor R1 , and lights up with high brightness when the switch 4 is on. On the other hand, the light emitting element 2 for illumination is in an off state. When using at night, switch means 6
If you turn on the lighting light emitting element 2, the resistance R 3
A current limited by is supplied to emit light, illuminating the liquid crystal display means 3, and the display light emitting element connected to the switching piece 7b side of the switch means 7 (R 1 +
Since the light is emitted under the current limitation by the resistor R 2 ), the brightness is lower than during the daytime. The value of the resistor R 2 is appropriately selected and determined so that it does not cause glare even at night.
このような構成によれば夜間照明用の発光素子
２の点灯に連動して表示用発光素子１の輝度を低
下させることが可能である。 According to such a configuration, it is possible to reduce the brightness of the display light emitting element 1 in conjunction with the lighting of the light emitting element 2 for night illumination.
第２図は本考案の他の実施例を示す構成図、第
３図はその動作説明図である。第１図と同一要素
には同一符号を付してその説明を省略する。８は
オープンコレクタのナンドゲートで、その出力に
表示用発光素子１のカソードが接続されており、
その入力は制御手段５よりステータス信号及びナ
ンドゲート９の出力である。ナンドゲート９の入
力はスイツチ６の出力及びナンドゲート１０の出
力である。ナンドゲート１０の入力は第３図Ａ，
Ｂ，Ｃに示す３種類のクロツク信号CLK１，
CLK２，CLK３である。CLK２はCLK１を1/2
に分周した信号であり、CLK３はCLK２を1/2に
分周した信号である。従つてナンドゲート１０の
出力は全信号がＨレベルの期間にＬレベルとなる
ので、Ｄのごとき信号が得られる。これはデユー
テイ1/8の信号である。 FIG. 2 is a block diagram showing another embodiment of the present invention, and FIG. 3 is an explanatory diagram of its operation. Elements that are the same as those in FIG. 1 are given the same reference numerals and their explanations will be omitted. 8 is an open collector NAND gate, and the cathode of the display light emitting element 1 is connected to its output.
Its inputs are the status signal from the control means 5 and the output of the NAND gate 9. The inputs of the NAND gate 9 are the output of the switch 6 and the output of the NAND gate 10. The input of the NAND gate 10 is shown in FIG. 3A,
Three types of clock signals CLK1, shown in B and C
CLK2 and CLK3. CLK2 is 1/2 CLK1
CLK3 is a signal obtained by dividing CLK2 into 1/2. Therefore, since the output of the NAND gate 10 is at L level while all the signals are at H level, a signal such as D is obtained. This is a signal with a duty of 1/8.
ナンドゲート８の出力は、ナンドゲート９の出
力がＨレベルを保持している場合は制御手段５よ
りの信号がＨレベルならばＬレベルとなり、表示
用発光素子１に電流が流れて高輝度で点灯する。
ナンドゲート９は、スイツチ６がオフの期間はナ
ンドゲート１０の出力の変化にかかわらずＨレベ
ルを保持する。スイツチ手段６がオンとなると、
第１図と同様に照明用発光素子２に電流が流れて
点灯すると共に、ナンドゲート９の一方の入力が
Ｈレベルとなる。この状態ではナンドゲート１０
の出力がＨレベルの期間９の出力はＬレベルとな
るので、９の出力は第３図Ｅに示した波形とな
る。ナンドゲート８は９の出力がＨレベルのとき
のみ能動となるので、制御手段５の出力がＨレベ
ルの場合は、Ｆに示すように、デユーテイ1/8の
期間のみＬレベルとなり、この期間のみ表示用発
光素子１に電流が供給される。即ち、表示用発光
素子１への平均電流は、スイツチ６がオフの場合
の1/8となり、輝度が低下する。 If the output of the NAND gate 9 is held at the H level and the signal from the control means 5 is at the H level, the output of the NAND gate 8 becomes the L level, and a current flows through the display light emitting element 1, causing it to light up with high brightness. .
NAND gate 9 maintains the H level while switch 6 is off, regardless of changes in the output of NAND gate 10. When the switch means 6 is turned on,
As in FIG. 1, a current flows through the illumination light emitting element 2 to turn it on, and one input of the NAND gate 9 becomes H level. In this state, NAND gate 10
During period 9 when the output of 9 is at H level, the output of 9 becomes L level, so the output of 9 has the waveform shown in FIG. 3E. Since the NAND gate 8 becomes active only when the output of the control means 5 is at the H level, when the output of the control means 5 is at the H level, it becomes the L level only during the duty 1/8 period, as shown in F, and is displayed only during this period. A current is supplied to the light emitting element 1 for use. That is, the average current to the display light emitting element 1 is 1/8 of that when the switch 6 is off, and the brightness is reduced.
この実施例では、ナンドゲート８への入力信号
のデユーテイを適当に選定することによつて輝度
の低下の度合を調整することができる。 In this embodiment, by appropriately selecting the duty of the input signal to the NAND gate 8, the degree of reduction in brightness can be adjusted.
〈効果〉
以上説明したように、本考案によれば、
(1) 夜間に発光素子の輝度を低下できるので、ま
ぶしすぎる事がなくなり、視認性が向上する。<Effects> As explained above, according to the present invention: (1) Since the brightness of the light emitting element can be lowered at night, there is no need for too much glare, and visibility is improved.
(2) 照明用発光素子を点灯させるときに、表示用
発光素子の消費電力を少なくできるので、計器
の内部温度上昇が少なくなり、信頼性が向上す
る。(2) Since the power consumption of the display light emitting element can be reduced when lighting the illumination light emitting element, the internal temperature rise of the meter is reduced and reliability is improved.
(3) 液晶表示手段の照明用スイツチと連動してい
るので切換え忘れが防止できる。(3) Since it is linked with the lighting switch of the liquid crystal display means, forgetting to switch it can be prevented.
第１図，第２図は本考案の一実施例を示す回路
構成図、第３図は第２図の動作説明図である。
１……表示用発光素子、２……照明用発光素
子、３……液晶表示手段、５……制御手段、６…
…液晶照明用のスイツチ手段。
1 and 2 are circuit configuration diagrams showing an embodiment of the present invention, and FIG. 3 is an explanatory diagram of the operation of FIG. 2. DESCRIPTION OF SYMBOLS 1... Light emitting element for display, 2... Light emitting element for illumination, 3... Liquid crystal display means, 5... Control means, 6...
...Switching means for LCD lighting.
Claims (1)
表示手段を照明するための照明用発光素子と、こ
の照明用発光素子の点灯を制御するためのスイツ
チ手段とを有する表示装置において、上記スイツ
チ手段と連動して上記表示用発光素子に供給され
る電流を切換えることを特徴とする表示装置。 In a display device comprising a display light emitting element, a liquid crystal display means, an illumination light emitting element for illuminating the liquid crystal display means, and a switch means for controlling lighting of the illumination light emitting element, the switch means A display device characterized in that the current supplied to the display light emitting element is switched in conjunction with the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2162084U JPS60135777U (en) | 1984-02-17 | 1984-02-17 | display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2162084U JPS60135777U (en) | 1984-02-17 | 1984-02-17 | display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60135777U JPS60135777U (en) | 1985-09-09 |
| JPH0353257Y2 true JPH0353257Y2 (en) | 1991-11-20 |
Family
ID=30513175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2162084U Granted JPS60135777U (en) | 1984-02-17 | 1984-02-17 | display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60135777U (en) |
-
1984
- 1984-02-17 JP JP2162084U patent/JPS60135777U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60135777U (en) | 1985-09-09 |
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