TW202101963A - 具有減量像素失真之光學接近性感測 - Google Patents
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Abstract
本發明揭示一種操作具有一顯示器之一電腦裝置之一光學接近性感測器之方法,其中該光學接近性感測器定位於該顯示器下方或否則定位於該顯示器鄰近處。該方法包括:自一顯示驅動器獲得一垂直同步信號;及使該光學接近性感測器之一光發射器之週期性照明與該垂直同步信號同步。
Description
本發明係關於具有顯示器之裝置中之光學接近性感測,其中接近性感測器定位於顯示器後面或否則定位於顯示器接近處。
諸多智慧型電話使用光學接近性感測器來判定應何時打開或關閉顯示器。此通常係為了(例如)在將智慧型電話放在一使用者之口袋中時節省電池電量或為了在接聽一電話時防止無用螢幕上顯示按鈕選擇。具有顯示器之其他電腦裝置(諸如平板電腦及膝上型電腦)之情況亦可如此,其中期望在關閉或否則蓋上裝置時關閉顯示器。光學接近性感測通常依賴於發射近紅外線(NIR)光且量測反射回之任何光能。高於某一臨限值之反射指示顯示器可能被蓋上。
為此,NIR光發射器先前定位於一智慧型電話或其他裝置之邊框中。然而,近年來,歸因於追求一高螢佔比,已自諸多裝置消除先前用於收容接近性感測器之邊框。諸多智慧型電話現今使用有機發光二極體(OLED)顯示器。OLED顯示器可容許包含NIR光之一些光穿過顯示器。因此,接近性感測器可定位於OLED顯示器後面。
然而,透過顯示器發射之NIR光之能量會引起顯示器上之一可見失真;例如,一亮點出現於接近性感測器之位置上方之顯示器中。此等失真可在諸多條件下可見,例如即使螢幕顯示一黑色影像。
根據本發明之一第一態樣,提供一種操作具有一顯示器之一電腦裝置之一光學接近性感測器之方法,其中該光學接近性感測器定位於該顯示器下方或否則定位於該顯示器鄰近處。該方法包括:自一顯示驅動器獲得一垂直同步信號;及使該光學接近性感測器之一光發射器之週期性照明與該垂直同步信號同步。
該顯示器可為一有機發光二極體顯示器。
該光學接近性感測器可為一紅外線光學接近性感測器,例如一近紅外線光學接近性感測器。
該同步步驟可包括向該垂直同步信號引入一延遲及使用該延遲信號之脈衝來觸發該週期性照明。該延遲可導致該發射器之照明緊接在該光學接近性感測器正上方之顯示區域之消隱或變暗之前。替代地,該延遲可導致該發射器之照明與該光學接近性感測器正上方之顯示區域之消隱或變暗部分一致。
該方法可包括在該垂直同步信號之各同步脈衝之後使該光發射器照明。替代地,可在該垂直同步信號之複數個同步脈衝之各序列之後使該光發射器照明。
根據本發明之一第二態樣,提供一種電腦裝置,其包括一顯示器及定位於該顯示器下方或否則定位於該顯示器鄰近處且包括一光發射器之一光學接近性感測器。該裝置進一步包括用於產生一垂直同步信號之一顯示驅動器且經組態以使該光發射器之週期性照明與該垂直同步信號同步。此同步可由該光學接近性感測器之(例如)一同步電路或由一處理器執行。
該顯示器可為一有機發光二極體顯示器。
該光學接近性感測器可為一紅外線光學接近性感測器,例如一近紅外線光學接近性感測器。
該裝置可包括用於使該垂直同步信號延遲之一延遲電路,其經整合至該光學接近性感測器中或經實施為與該光學接近性感測器分離之一組件,該延遲電路經耦合至該光發射器以觸發該光發射器之照明。該延遲電路可使該垂直同步信號延遲以引起該發射器之照明緊接在該光學接近性感測器正上方之顯示區域之消隱或變暗之前。替代地,該延遲電路可使該垂直同步信號延遲以引起該發射器之照明與該光學接近性感測器正上方之顯示區域之消隱或變暗部分一致。
該裝置可為一智慧型電話、平板電腦或膝上型電腦。
本發明之實施例提供一種用於減少或消除一顯示器中之像素失真之方式,同時繼續允許使用定位於顯示器後面之一NIR光源用於光學接近性感測。
上文已討論藉由在一顯示器(諸如一OLED顯示器)下方使用一NIR接近性感測器引起之問題。下文將討論之解決方案源自以下認識:可藉由僅在相對於顯示像素之操作狀態之一最佳時間點使接近性感測器照明來減少失真。
在一顯示器之操作期間,以一圖像再新率週期性再新顯示器。此速率可為(例如) 60Hz,即,顯示器每秒更新60次。一新圖框之開始由裝置之一顯示驅動器產生之一垂直同步(VSYNC)脈衝信號指示。VSYNC信號使處理器之圖框率及顯示器之再新率同步,使得每秒圖框數(FPS)受再新率限制且無圖框被跳過。VSYNC脈衝指示在顯示器上開始一新圖框(影像)。本發明使用VSYNC脈衝來使將來自接近性感測器之光發射與顯示器再新率同步。明確言之,NIR光學發射經同步以開始於顯示器之再新循環中之一時間點,其結果能使影像之失真減少或消除。取決於存在於裝置中之特定OLED顯示器,最佳發射時間可緊接在接近性感測器上方之顯示像素處於非作用中之時間之前或正好在其期間。本發明允許在顯示器下方繼續使用一NIR接近性感測器,同時允許邊框變薄或完全不存在,且無需更昂貴解決方案,諸如使用遠紅外線(FIR)發射器或超音波解決方案。
圖1示意性繪示一例示性智慧型電話1,其以穿過垂直於顯示器之平面之一平面之截面展示。智慧型電話1包括一OLED顯示器2、一OLED顯示驅動器3及智慧型電話之主體內、OLED顯示器下方之一NIR光學接近性感測器模組4。顯示驅動器3通常由硬體及軟體之一組合實施,其中硬體可包括一圖形處理單元(GPU)及相關聯記憶體。接近性感測器模組4包括一NIR發射器5及鄰近偵測器6,其等具有顯示器2之下側之一清晰視線。儘管未展示,但感測器模組可包括諸如透鏡之光學組件。接近性感測器模組4亦具有一積體延遲電路7,且可透過一暫存器組態以最佳化光發射之時序以減少顯示像素失真。一給定顯示器之準確組態可(例如)在一產品之一原型製作階段期間憑經驗判定。
圖2係展示圖1之智慧型電話中之具有減量像素失真之光學接近性感測之一高階程序的一流程圖。在智慧型電話之操作期間,由OLED顯示驅動器3週期性產生一VSYNC信號(S1.1)用於再新顯示器。在此,將VSYNC另外提供給光學接近性感測器模組4之積體延遲電路7 (S1.2)。當延遲電路偵測到VSYNC信號之一時序(再新)脈衝時,其啟動一延遲計時器(S1.3),且在延遲計時器屆期之後觸發由發射器5在一預定時段內發射NIR光(S1.4)。所發射之光將穿過OLED顯示器2以與可在顯示器正前方之任何物體互動。透過OLED顯示器反射回之任何光由偵測器6偵測。
圖3示意性繪示圖1之智慧型電話1之相關功能組件。此等包含OLED顯示驅動器3及光學接近性感測器模組4,光學接近性感測器模組4包括積體延遲電路7。VSYNC信號經展示為自驅動器3傳輸至模組4之延遲電路7。
圖4繪示一例示性時序方案。上跡線8繪示由OLED顯示驅動器3產生之VSYNC信號,中間跡線9繪示接近性感測器模組4上方之位置處之顯示亮度,且下跡線10繪示來自接近性感測器模組4之發射器5之光發射。在一VSYNC脈衝之前緣之後的一給定時間t1
,接近性感測器模組4上方之顯示亮度由於再新或「消隱」對應像素線而暫時降低。為利用此狀態,在自VSYNC脈衝之前緣之一時間延遲t2
之後,延遲電路7產生一發射器驅動脈衝來驅動接近性感測器模組之發射器5。此驅動脈衝具有一持續時間t3
。最佳化時段t2
及t3
以最小化顯示器2中由NIR光脈衝產生之視覺失真。例如,時序可導致在覆蓋顯示像素消隱之前的非常短時間內產生NIR光脈衝。
圖5展示由圖2之步驟所致之例示性跡線。VSYNC脈衝由下跡線之峰值11展示。在VSYNC脈衝之前緣之後約1.76 ms,接近性感測器發射光(在測試條件下使用定位於顯示器上方之一NIR感測器偵測),如由峰值12所展示。在發射接近性感測光之後約1.15 ms,消隱像素,如由波谷13所展示。
不同顯示器及(若干) IR發射器可具有不同時序要求以達成最小失真。例如,自VSYNC脈衝之前緣至像素線再新之時間t1
將可能基於特定顯示器及顯示器下方感測器模組之位置來變動。開始時間t2
及持續時間t3
將相應變動。
應瞭解,將最佳化發射之光功率以儘可能減少像素失真。
應瞭解,可對時序方案作出進一步修改。例如,可引入一長延遲t2
(例如10 ms或更長)以引起一些VSYNC脈衝被跳過。例如圖6中所展示,可僅在每隔一個VSYNC脈衝11上觸發NIR光脈衝12。替代地,一計數器可與一短延遲結合使用以僅在發生一定數目個VSYNC脈衝之後觸發一接近性量測發射。當顯示器每VSYNC信號消隱一次以上(其可(例如)發生於顯示器以低於100%亮度操作時)時,可藉由使接近性脈衝同步發生於VSYNC信號之後的第一次消隱之前來最佳化像素失真。此外,接近性脈衝12可與消隱時間13重疊。
亦可對圖1及圖3之設備作出修改。例如圖7中所展示,延遲功能不是整合至接近性感測器中,而是可由分開的延遲電路(例如微控制器14)執行。由圖8之流程圖展示由圖7之設備實施之一高階程序。VSYNC信號自OLED顯示驅動器3發送(S2.1)且由外部延遲電路(諸如一微控制器14)接收(S2.2)。微控制器將一延遲添加至VSYNC信號(S2.3),且使此延遲VSYNC信號經由一GPIO介面傳遞至一接近性感測器15 (S2.4)。GPIO脈衝到達接近性感測器(S2.5)觸發NIR光發射開始(S2.6)。可在接收GPIO脈衝之時間與發射光之時間之間存在感測器之操作固有之一進一步延遲。
圖9中展示可由圖7之架構及實施圖8之步驟所致之例示性跡線。在VSYNC脈衝11之前緣之後0.650 ms觀察到發射器驅動信號(GPIO)脈衝16。在GPIO脈衝之前緣之後的一進一步延遲1.11 ms之後,接近性感測器發射光,如由峰值12所展示。再次在發射接近性感測光之後1.15 ms消隱像素,如由波谷13所展示。
光學發射器可為一NIR LED (例如,以940 nm發射)、垂直腔面射型雷射(VCSEL)發射器或可產生一無用像素失真之任何其他適合光學發射器。
1:智慧型電話
2:有機發光二極體(OLED)顯示器
3:OLED顯示驅動器
4:接近性感測器模組
5:近紅外線(NIR)發射器
6:偵測器
7:積體延遲電路
8:上跡線
9:中間跡線
10:下跡線
11:峰值/VSYNC脈衝
12:峰值/NIR光脈衝/接近性脈衝
13:波谷/消隱時間
14:微控制器
15:接近性感測器
16:發射器驅動信號(GPIO)脈衝
S1.1:發送VSYNC信號
S1.2:接收VSYNC信號
S1.3:延遲
S1.4:光學發射
S2.1:發送VSYNC信號
S2.2:由微控制器接收VSYNC信號
S2.3:由微控制器引入延遲
S2.4:將經延遲脈衝發送給光學感測器之GPIO
S2.5:由感測器接收經延遲GPIO脈衝
S2.6:光學發射
圖1示意性展示具有接近性感測器之一智慧型電話;
圖2係繪示一高階光學接近性感測方法的一流程圖;
圖3示意性展示圖1之智慧型電話之組件之操作互動;
圖4繪示圖1之智慧型電話之一時序方案;
圖5展示使用圖4之時序方案產生之例示性跡線;
圖6展示若干顯示循環內之替代例示性跡線;
圖7示意性展示一智慧型電話之組件之一替代操作互動;
圖8係繪示一高階替代光學接近性感測方法的一流程圖;
圖9展示使用圖8之方法產生之例示性跡線。
S1.1:發送VSYNC信號
S1.2:接收VSYNC信號
S1.3:延遲
S1.4:光學發射
Claims (15)
- 一種操作具有一顯示器之一電腦裝置之一光學接近性感測器之方法,其中該光學接近性感測器定位於該顯示器下方或否則定位於該顯示器鄰近處,該方法包括: 自一顯示驅動器獲得一垂直同步信號;及 使該光學接近性感測器之一光發射器之週期性照明與該垂直同步信號同步。
- 如請求項1之方法,其中該顯示器係一有機發光二極體顯示器。
- 如請求項1或2之方法,其中該光學接近性感測器係一紅外線光學接近性感測器,例如一近紅外線光學接近性感測器。
- 如請求項1或2之方法,其中該同步步驟包括將一延遲引入至該垂直同步信號及使用該延遲信號之脈衝來觸發該週期性照明。
- 如請求項4之方法,其中該延遲導致該發射器之照明緊接在該光學接近性感測器正上方之顯示區域之消隱或變暗之前。
- 如請求項4之方法,其中該延遲導致該發射器之照明與該光學接近性感測器正上方之顯示區域之該消隱或變暗部分一致。
- 如請求項1或2之方法,其包括在該垂直同步信號之各同步脈衝之後使該光發射器照明。
- 如請求項1或2之方法,其包括在該垂直同步信號之複數個同步脈衝之各序列之後使該光發射器照明。
- 一種電腦裝置,其包括: 一顯示器; 一光學接近性感測器,其定位於該顯示器下方或否則定位於該顯示器鄰近處且包括一光發射器;及 一顯示驅動器,其用於產生一垂直同步信號, 該裝置經組態以使該光發射器之週期性照明與該垂直同步信號同步。
- 如請求項9之電腦裝置,該顯示器係一有機發光二極體顯示器。
- 如請求項10之電腦裝置,該光學接近性感測器係一紅外線光學接近性感測器,例如一近紅外線光學接近性感測器。
- 如請求項9至11中任一項之電腦裝置,其包括用於使該垂直同步信號延遲之一延遲電路,該延遲電路經整合至該光學接近性感測器中或經實施為與該光學接近性感測器分離之一組件,該延遲電路經耦合至該光發射器以觸發該光發射器之照明。
- 如請求項12之電腦裝置,其中該延遲電路使該垂直同步信號延遲以引起該發射器之照明緊接在該光學接近性感測器正上方之顯示區域之消隱或變暗之前。
- 如請求項12之電腦裝置,其中該延遲電路使該垂直同步信號延遲以引起該發射器之照明與該光學接近性感測器正上方之顯示區域之該消隱或變暗部分一致。
- 如請求項9至14中任一項之電腦裝置,該裝置係一智慧型電話、平板電腦或膝上型電腦之一者。
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US8451209B2 (en) * | 2002-12-06 | 2013-05-28 | Sharp Kabushiki Kaisha | Liquid crystal display device |
JP4912597B2 (ja) * | 2004-07-13 | 2012-04-11 | パナソニック株式会社 | 液晶表示装置 |
US20080030615A1 (en) * | 2005-06-29 | 2008-02-07 | Maximino Vasquez | Techniques to switch between video display modes |
JP2008015755A (ja) * | 2006-07-05 | 2008-01-24 | Toshiba Matsushita Display Technology Co Ltd | センサ内蔵表示装置 |
US7944438B2 (en) * | 2007-04-13 | 2011-05-17 | Omnivision Technologies, Inc. | System and method for improving image quality by synchronizing display modulation with light source pulses |
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US10037112B2 (en) * | 2015-09-30 | 2018-07-31 | Synaptics Incorporated | Sensing an active device'S transmission using timing interleaved with display updates |
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