← Back to Patent Explorer
JPH05127635A Expired / Lapsed JP ⏱️ 0.0 years remaining

Display brightness automatic adjustment device

Assignee: NEC Corp
•
Filing: 1991-10-30
•
Granted: —
•
Expires: 2011-10-30
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract Translated from Japanese (57)【要約】 【目的】 画面の輝度を常時一定に保つディスプレイ輝 度自動調節装置を提供する。 【構成】 カウンタ部3はビデオメモリ1の内容をビデ オ出力信号10経由で入力し、各階調色の画素数を垂直 同期信号12が出力されてから次の垂直同期信号12が 出力されるまでの間カウントする。輝度レベル決定部4 はカウンタ部3から各階調色毎の画素数13を入力し、 明るい階調色の画素が多いと、輝度レベルを下げるよう に、明るい階調色の画素が少ないと、輝度レベルを上げ るように各階調色とその画素数に対応して予め決められ た輝度レベル14を選択し、D/Aコンバータ5を経て アンプ6に輝度レベル指示信号15を出力する。アンプ 6は輝度レベル指示信号15に基づいてCRTディスプ レイ7の輝度を変更する。 (57) [Abstract] [Purpose] To provide a display brightness automatic adjusting device which constantly maintains the screen brightness. [Structure] The counter unit 3 inputs the contents of the video memory 1 via a video output signal 10, and outputs the number of pixels of each gradation color from a vertical synchronization signal 12 to the output of the next vertical synchronization signal 12. Count for a while. Brightness level determination unit 4 Inputs the number of pixels 13 for each gradation color from the counter unit 3, If there are many bright gradation color pixels, the brightness level is lowered, and if there are few bright gradation color pixels, the brightness level is raised, and a predetermined brightness level corresponding to each gradation color and its number of pixels. 14 is selected, and the brightness level instruction signal 15 is output to the amplifier 6 via the D / A converter 5. The amplifier 6 changes the brightness of the CRT display 7 based on the brightness level instruction signal 15.

Inventors

  • 👤 Yukio Nagasawa
  • 👤 幸雄 長澤

Bibliographic Details

Application Number —
Jurisdiction JP
Data Source google_patents
Last Synchronized 2026-11-06 01:01
CPC Classifications
—

Claims Analysis

Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag