diff --git a/packages/SystemUI/res-keyguard/layout/keyguard_pin_view.xml b/packages/SystemUI/res-keyguard/layout/keyguard_pin_view.xml
index a22a56fb3c610..7c54b90f1915e 100644
--- a/packages/SystemUI/res-keyguard/layout/keyguard_pin_view.xml
+++ b/packages/SystemUI/res-keyguard/layout/keyguard_pin_view.xml
@@ -47,11 +47,11 @@
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:paddingBottom="@dimen/num_pad_entry_row_margin_bottom"
-            androidprv:layout_constraintBottom_toTopOf="@id/key1"
             androidprv:layout_constraintEnd_toEndOf="parent"
             androidprv:layout_constraintStart_toStartOf="parent"
 
             androidprv:layout_constraintTop_toTopOf="parent"
+            androidprv:layout_constraintBottom_toTopOf="@id/key1"
             androidprv:layout_constraintVertical_bias="1.0">
 
             <com.android.keyguard.PasswordTextView
@@ -65,6 +65,15 @@
                 androidprv:scaledTextSize="@integer/scaled_password_text_size" />
         </com.android.keyguard.AlphaOptimizedRelativeLayout>
 
+        <!-- Guideline used to place the top row of keys relative to the screen height. This will be
+             updated in KeyguardPINView to reduce the height of the PIN pad. -->
+        <androidx.constraintlayout.widget.Guideline
+            android:id="@+id/pin_pad_top_guideline"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            androidprv:layout_constraintGuide_percent="0"
+            android:orientation="horizontal" />
+
         <androidx.constraintlayout.helper.widget.Flow
             android:id="@+id/flow1"
             android:layout_width="0dp"
@@ -78,16 +87,15 @@
             androidprv:flow_horizontalStyle="packed"
             androidprv:flow_maxElementsWrap="3"
 
+            androidprv:flow_verticalBias="1.0"
             androidprv:flow_verticalGap="@dimen/num_pad_entry_row_margin_bottom"
             androidprv:flow_verticalStyle="packed"
-            androidprv:flow_verticalBias="1.0"
 
             androidprv:flow_wrapMode="aligned"
-
-            androidprv:layout_constraintTop_toTopOf="parent"
             androidprv:layout_constraintBottom_toBottomOf="parent"
             androidprv:layout_constraintEnd_toEndOf="parent"
-            androidprv:layout_constraintStart_toStartOf="parent" />
+            androidprv:layout_constraintStart_toStartOf="parent"
+            androidprv:layout_constraintTop_toBottomOf="@id/pin_pad_top_guideline" />
 
         <com.android.keyguard.NumPadKey
             android:id="@+id/key1"
diff --git a/packages/SystemUI/res-keyguard/values/dimens.xml b/packages/SystemUI/res-keyguard/values/dimens.xml
index 7e3c87b24f07b..a2ae5023166f3 100644
--- a/packages/SystemUI/res-keyguard/values/dimens.xml
+++ b/packages/SystemUI/res-keyguard/values/dimens.xml
@@ -98,4 +98,10 @@
     <dimen name="below_clock_padding_start">32dp</dimen>
     <dimen name="below_clock_padding_end">16dp</dimen>
     <dimen name="below_clock_padding_start_icons">28dp</dimen>
+
+    <!-- Proportion of the screen height to use to set the maximum height of the bouncer to when
+         the device is in the DEVICE_POSTURE_HALF_OPENED posture, for the PIN/pattern entry. 0 will
+         allow it to use the whole screen space, 0.6 will allow it to use just under half of the
+         screen. -->
+    <item name="half_opened_bouncer_height_ratio" type="dimen" format="float">0.0</item>
 </resources>
diff --git a/packages/SystemUI/src/com/android/keyguard/KeyguardInputViewController.java b/packages/SystemUI/src/com/android/keyguard/KeyguardInputViewController.java
index 97d3a5a4cd183..b473f6d36c5cd 100644
--- a/packages/SystemUI/src/com/android/keyguard/KeyguardInputViewController.java
+++ b/packages/SystemUI/src/com/android/keyguard/KeyguardInputViewController.java
@@ -28,6 +28,7 @@ import com.android.keyguard.KeyguardSecurityModel.SecurityMode;
 import com.android.systemui.R;
 import com.android.systemui.classifier.FalsingCollector;
 import com.android.systemui.dagger.qualifiers.Main;
+import com.android.systemui.statusbar.policy.DevicePostureController;
 import com.android.systemui.util.ViewController;
 import com.android.systemui.util.concurrency.DelayableExecutor;
 
@@ -166,6 +167,7 @@ public abstract class KeyguardInputViewController<T extends KeyguardInputView>
         private final TelephonyManager mTelephonyManager;
         private final EmergencyButtonController.Factory mEmergencyButtonControllerFactory;
         private final FalsingCollector mFalsingCollector;
+        private final DevicePostureController mDevicePostureController;
 
         @Inject
         public Factory(KeyguardUpdateMonitor keyguardUpdateMonitor,
@@ -175,7 +177,8 @@ public abstract class KeyguardInputViewController<T extends KeyguardInputView>
                 InputMethodManager inputMethodManager, @Main DelayableExecutor mainExecutor,
                 @Main Resources resources, LiftToActivateListener liftToActivateListener,
                 TelephonyManager telephonyManager, FalsingCollector falsingCollector,
-                EmergencyButtonController.Factory emergencyButtonControllerFactory) {
+                EmergencyButtonController.Factory emergencyButtonControllerFactory,
+                DevicePostureController devicePostureController) {
             mKeyguardUpdateMonitor = keyguardUpdateMonitor;
             mLockPatternUtils = lockPatternUtils;
             mLatencyTracker = latencyTracker;
@@ -187,6 +190,7 @@ public abstract class KeyguardInputViewController<T extends KeyguardInputView>
             mTelephonyManager = telephonyManager;
             mEmergencyButtonControllerFactory = emergencyButtonControllerFactory;
             mFalsingCollector = falsingCollector;
+            mDevicePostureController = devicePostureController;
         }
 
         /** Create a new {@link KeyguardInputViewController}. */
@@ -212,7 +216,8 @@ public abstract class KeyguardInputViewController<T extends KeyguardInputView>
                 return new KeyguardPinViewController((KeyguardPINView) keyguardInputView,
                         mKeyguardUpdateMonitor, securityMode, mLockPatternUtils,
                         keyguardSecurityCallback, mMessageAreaControllerFactory, mLatencyTracker,
-                        mLiftToActivateListener, emergencyButtonController, mFalsingCollector);
+                        mLiftToActivateListener, emergencyButtonController, mFalsingCollector,
+                        mDevicePostureController);
             } else if (keyguardInputView instanceof KeyguardSimPinView) {
                 return new KeyguardSimPinViewController((KeyguardSimPinView) keyguardInputView,
                         mKeyguardUpdateMonitor, securityMode, mLockPatternUtils,
diff --git a/packages/SystemUI/src/com/android/keyguard/KeyguardPINView.java b/packages/SystemUI/src/com/android/keyguard/KeyguardPINView.java
index 82ade7aa18066..1efda7edee2f8 100644
--- a/packages/SystemUI/src/com/android/keyguard/KeyguardPINView.java
+++ b/packages/SystemUI/src/com/android/keyguard/KeyguardPINView.java
@@ -16,19 +16,23 @@
 
 package com.android.keyguard;
 
+import static com.android.systemui.statusbar.policy.DevicePostureController.DEVICE_POSTURE_HALF_OPENED;
+import static com.android.systemui.statusbar.policy.DevicePostureController.DEVICE_POSTURE_UNKNOWN;
+
 import android.content.Context;
 import android.content.res.Configuration;
 import android.util.AttributeSet;
 import android.view.View;
-import android.view.ViewGroup;
 import android.view.animation.AnimationUtils;
 
 import androidx.constraintlayout.widget.ConstraintLayout;
+import androidx.constraintlayout.widget.ConstraintSet;
 
 import com.android.internal.jank.InteractionJankMonitor;
 import com.android.settingslib.animation.AppearAnimationUtils;
 import com.android.settingslib.animation.DisappearAnimationUtils;
 import com.android.systemui.R;
+import com.android.systemui.statusbar.policy.DevicePostureController.DevicePostureInt;
 
 /**
  * Displays a PIN pad for unlocking.
@@ -38,9 +42,10 @@ public class KeyguardPINView extends KeyguardPinBasedInputView {
     private final AppearAnimationUtils mAppearAnimationUtils;
     private final DisappearAnimationUtils mDisappearAnimationUtils;
     private final DisappearAnimationUtils mDisappearAnimationUtilsLocked;
-    private ViewGroup mContainer;
+    private ConstraintLayout mContainer;
     private int mDisappearYTranslation;
     private View[][] mViews;
+    @DevicePostureInt private int mLastDevicePosture = DEVICE_POSTURE_UNKNOWN;
 
     public KeyguardPINView(Context context) {
         this(context, null);
@@ -67,6 +72,11 @@ public class KeyguardPINView extends KeyguardPinBasedInputView {
         updateMargins();
     }
 
+    void onDevicePostureChanged(@DevicePostureInt int posture) {
+        mLastDevicePosture = posture;
+        updateMargins();
+    }
+
     @Override
     protected void resetState() {
     }
@@ -109,6 +119,16 @@ public class KeyguardPINView extends KeyguardPinBasedInputView {
                 key.setLayoutParams(lp);
             }
         }
+
+        // Update the guideline based on the device posture...
+        float halfOpenPercentage =
+                mContext.getResources().getFloat(R.dimen.half_opened_bouncer_height_ratio);
+
+        ConstraintSet cs = new ConstraintSet();
+        cs.clone(mContainer);
+        cs.setGuidelinePercent(R.id.pin_pad_top_guideline,
+                mLastDevicePosture == DEVICE_POSTURE_HALF_OPENED ? halfOpenPercentage : 0.0f);
+        cs.applyTo(mContainer);
     }
 
     @Override
diff --git a/packages/SystemUI/src/com/android/keyguard/KeyguardPinViewController.java b/packages/SystemUI/src/com/android/keyguard/KeyguardPinViewController.java
index 262bed3f695c9..9f4585fb1a922 100644
--- a/packages/SystemUI/src/com/android/keyguard/KeyguardPinViewController.java
+++ b/packages/SystemUI/src/com/android/keyguard/KeyguardPinViewController.java
@@ -23,10 +23,14 @@ import com.android.internal.widget.LockPatternUtils;
 import com.android.keyguard.KeyguardSecurityModel.SecurityMode;
 import com.android.systemui.R;
 import com.android.systemui.classifier.FalsingCollector;
+import com.android.systemui.statusbar.policy.DevicePostureController;
 
 public class KeyguardPinViewController
         extends KeyguardPinBasedInputViewController<KeyguardPINView> {
     private final KeyguardUpdateMonitor mKeyguardUpdateMonitor;
+    private final DevicePostureController mPostureController;
+    private final DevicePostureController.Callback mPostureCallback = posture ->
+            mView.onDevicePostureChanged(posture);
 
     protected KeyguardPinViewController(KeyguardPINView view,
             KeyguardUpdateMonitor keyguardUpdateMonitor,
@@ -35,11 +39,13 @@ public class KeyguardPinViewController
             KeyguardMessageAreaController.Factory messageAreaControllerFactory,
             LatencyTracker latencyTracker, LiftToActivateListener liftToActivateListener,
             EmergencyButtonController emergencyButtonController,
-            FalsingCollector falsingCollector) {
+            FalsingCollector falsingCollector,
+            DevicePostureController postureController) {
         super(view, keyguardUpdateMonitor, securityMode, lockPatternUtils, keyguardSecurityCallback,
                 messageAreaControllerFactory, latencyTracker, liftToActivateListener,
                 emergencyButtonController, falsingCollector);
         mKeyguardUpdateMonitor = keyguardUpdateMonitor;
+        mPostureController = postureController;
     }
 
     @Override
@@ -53,6 +59,14 @@ public class KeyguardPinViewController
                 getKeyguardSecurityCallback().onCancelClicked();
             });
         }
+
+        mPostureController.addCallback(mPostureCallback);
+    }
+
+    @Override
+    protected void onViewDetached() {
+        super.onViewDetached();
+        mPostureController.removeCallback(mPostureCallback);
     }
 
     @Override