JPH01133192U

JPH01133192U -

Info

Publication number: JPH01133192U
Application number: JP1988028425U
Authority: JP
Priority date: 1988-03-03
Filing date: 1988-03-03
Publication date: 1989-09-11

Description

[Brief explanation of the drawing]

第１図は本考案実施例の構成ブロツク図。第２
図は同実施例制御装置周辺の構成ブロツク図。第
３図は同実施例表示板上に配される発光ダイオー
ドの回路構成図。第４図は緑色ＬＥＤと赤色ＬＥ
Ｄの発光デユーテイーコントロールの一例を示す
タイムチヤート。第５図は外光の明るさレベルと
それに対応する発光ダイオードの発光輝度変化例
。第６図は発光輝度制御系に関する構成ブロツク
図。Ｇ_１〜Ｇ_４・Ｒ_１〜Ｒ_４は発光ダイオード、３
は制御装置、９は外光センサー、１０は温度セン
サー、２４は温度レベル判定手段、１７は明るさ
レベル判定手段、１８は発光デユーテイー設定手
段。 FIG. 1 is a block diagram of an embodiment of the present invention. Second
The figure is a block diagram of the configuration around the control device of the same embodiment. FIG. 3 is a circuit diagram of a light emitting diode arranged on the display board of the same embodiment. Figure 4 shows green LED and red LED
A time chart showing an example of light emission duty control of D. Figure 5 shows an example of the brightness level of external light and the corresponding change in luminance of a light emitting diode. FIG. 6 is a configuration block diagram regarding the light emission brightness control system. G ₁ to G ₄ and R ₁ to _{R 4} are light emitting diodes, 3
9 is a control device, 9 is an external light sensor, 10 is a temperature sensor, 24 is a temperature level determination means, 17 is a brightness level determination means, and 18 is a light emission duty setting means.

Claims

[Scope of utility model registration request]

A plurality of light emitting diodes arranged in a matrix on the display board, a display board controller that selectively lights up the light emitting diodes and displays information on the display board, and a display board controller that receives external light around the display board and is proportional to the brightness. an external light sensor that converts the temperature into an electrical signal; a temperature sensor that detects the temperature around the display panel; and a temperature level determination means that determines which level of multiple levels the temperature detected by the temperature sensor is located at. and a brightness level determining means that is applied to the external light sensor and determines the brightness level of ambient external light; and a brightness level determining means that is applied to the temperature and brightness level determining means that sets the light emission duty of the light emitting diode and determines the brightness of the light emitting diode. and a light emission duty setting means for varying the light emission duty, the light emission duty is decreased for each level in proportion to the temperature level at which the detected temperature is located shifts from the normal temperature level to the high temperature level side, and has priority over information from the external light sensor. The electronic display device is characterized in that the brightness of the light emitting diodes is lowered by the temperature change, and all the light emitting diodes are turned off when the detected temperature is at the highest level.